California Weather-Hydro Conditions during January 2009 · PDF fileacre-feet (MAF), which is about 36 percent of average. ... 635 : 86 . 1,025 : 53 -221 : 479. Millerton Lake : San

California Weather-Hydro Conditions during January 2009

As of January 31, 2009, statewide hydrologic conditions were as follows: precipitation, 65 percent of average to date; runoff, 35 percent of average to date; and reservoir storage, 65 percent of average for the date. The snowpack was at about 60 percent of its average value for the date. Sacramento River unimpaired runoff observed through January 31, 2009 was about 2.1 million acre-feet (MAF), which is about 36 percent of average. (On January 31, 2008, the observed Sacramento River unimpaired runoff through that date was about 2.9 MAF or about 51 percent of average.) For California statewide, January 2009 was the eighth driest January on record, with precipitation at about 30 percent of average for the month. In general, temperatures were significantly above average. On February 1, 2009, the Northern Sierra 8-station Precipitation Index had accumulated a seasonal total of 17.7 inches, which is 66% of the seasonal average to date and 35% of an average Water Year (50.0 inches). During January 2009, the 8-Station Index received only 3.1 inches, about 34% of average. Last year at this time, the 8-Station Index had 25.1 inches for the seasonal total.

Selected Cities Precipitation Accumulation as of 2/01/2009 (National Weather Service Water Year: July through June)

City Jul 1 to Date 2008 - 2009 (in inches)

% Avg

Jul 1 to Date2007 - 2008 (in inches)

% Avg

% Avg “Water Year”Jul 1 to Jun 30

2008 - 2009 Eureka 13.76 62 26.10 118 36 Redding 8.39 46 19.76 108 25 Sacramento 6.14 62 11.81 118 34 San Francisco 5.70 50 13.25 117 28 Fresno 3.72 66 6.00 107 33 Bakersfield 2.07 67 1.50 48 32 Los Angeles 4.52 66 7.95 117 34 San Diego 6.13 111 5.53 100 57

Key Reservoir Storage (1,000 AF) as of 2/01/2009

Reservoir River Storage

Avg Storage

% Average

Capacity

% Capacity

Flood Control Encroachment

Total Space Available

Trinity Lake Trinity 982 1,766 56 2,448 40 --- 1,466Shasta Lake Sacramento 1,416 3,141 45 4,552 31 -2,434 3,136Lake Oroville Feather 1,022 2,388 43 3,538 29 -2,141 2,516New Bullards Bar Res Yuba 477 583 82 966 49 -319 489Folsom Lake American 247 517 48 977 25 -330 730New Melones Res Stanislaus 1,169 1,393 84 2,420 48 -801 1,251Don Pedro Res Tuolumne 1,101 1,387 79 2,030 54 -589 929Lake McClure Merced 285 502 57 1,025 28 -389 740Millerton Lake San Joaquin 230 340 67 520 44 -191 290Pine Flat Res Kings 229 480 48 1,000 23 -511 771Isabella Kern 125 169 74 568 22 -120 443San Luis Res (Offstream) 704 1,631 43 2,039 35 --- 1,335 The latest National Weather Service Climate Prediction Center (CPC) long-range weather outlook for February 2009, issued January 31, 2009, forecasts average precipitation for all of California.

California Weather-Hydro Conditions: 2009

California State Meteorologist

California Weather-Hydro Conditions during February 2009

As of March 1, 2009, statewide hydrologic conditions were as follows: precipitation, 80 percent of average to date; runoff, 45 percent of average to date; and reservoir storage, 70 percent of average for the date. The snowpack was at about 75 percent of its average value for the date. Sacramento River unimpaired runoff observed through February 28, 2009 was about 4.1 million acre-feet (MAF), which is about 48 percent of average. (On February 28, 2008, the observed Sacramento River unimpaired runoff through that date was about 4.5 MAF or about 53 percent of average.) For California statewide, precipitation for February was well above average. The Northern Sierra 8-Station Precipitation Index gained 11.9 inches, about 149 percent of average. This trend continued into early March. By March 10, the 8-Stations had gained an additional 6.4 inches, about 93 percent of the entire monthly average. As of March 11, the 8-Station water year total to date was 36.0 inches, about 97 percent of the seasonal average and 72 percent of an average water year (50 inches).



% Avg


% Avg


2008 - 2009 Eureka 22.09 76 28.86 99 58

Redding 18.34 72 22.92 91 55 Sacramento 13.25 92 13.62 95 74

San Francisco 14.08 86 15.29 94 70 Fresno 6.33 76 8.08 97 56

Bakersfield 3.98 84 2.30 49 61 Los Angeles 7.97 75 10.12 95 61 San Diego 8.80 107 6.74 82 82



Avg Storage

% Average

Capacity

% Capacity



Trinity Lake Trinity 1,107 1,879 59 2,448 45 --- 1,341Shasta Lake Sacramento 2,414 3,465 70 4,552 53 -1,269 2,138Lake Oroville Feather 1,659 2,581 64 3,538 47 -1,284 1,879New Bullards Bar Res Yuba 669 640 105 966 69 -127 297Folsom Lake American 599 570 105 977 61 -30 378New Melones Res Stanislaus 1,262 1,454 87 2,420 52 -708 1,158Don Pedro Res Tuolumne 1,276 1,447 88 2,030 63 -414 754Lake McClure Merced 359 547 66 1,025 35 -315 666Millerton Lake San Joaquin 326 349 93 520 63 -66 194Pine Flat Res Kings 308 540 57 1,000 31 -464 692Isabella Kern 136 183 74 568 24 -152 432San Luis Res (Offstream) 883 1,794 49 2,039 43 --- 1,156 The latest National Weather Service Climate Prediction Center (CPC) long-range weather outlook for March 2009, issued February 28, 2009, forecasts above average precipitation for most of Northern and Central California. Average precipitation is expected elsewhere in the State.



California Weather-Hydro Conditions during March 2009

As of April 1, 2009, statewide hydrologic conditions were as follows: precipitation, 80 percent of average to date; runoff, 55 percent of average to date; and reservoir storage, 80 percent of average for the date. The snowpack was at about 80 percent of its average value for the date. Sacramento River unimpaired runoff observed through March 31, 2009 was about 7.1 million acre-feet (MAF), which is about 63 percent of average. (On March 31, 2008, the observed Sacramento River unimpaired runoff through that date was about 5.9 MAF or about 52 percent of average.) As of April 1, the Northern Sierra 8-Station Precipitation Index water year total to date was 37.8 inches, about 91 percent of the seasonal average and 76 percent of an average water year (50 inches).



% Avg


% Avg


2008 - 2009 Eureka 25.41 77 31.79 96 67






Avg Storage

% Average

Capacity

% Capacity



Trinity Lake Trinity 1,197 1,963 61 2,448 49 --- 1,251Shasta Lake Sacramento 2,894 3,747 77 4,552 64 -1,248 1,658Lake Oroville Feather 1,990 2,761 72 3,538 56 -1,121 1,548New Bullards Bar Res Yuba 776 697 111 966 80 -24 190Folsom Lake American 749 629 119 977 77 46 228New Melones Res Stanislaus 1,287 1,486 87 2,420 53 -758 1,133Don Pedro Res Tuolumne 1,347 1,473 91 2,030 66 -343 683Lake McClure Merced 400 579 69 1,025 39 -250 625Millerton Lake San Joaquin 392 360 109 520 75 84 128Pine Flat Res Kings 360 561 64 1,000 36 -416 640Isabella Kern 144 195 74 568 25 -270 424San Luis Res (Offstream) 1,007 1,875 54 2,039 49 --- 1,032 The latest National Weather Service Climate Prediction Center (CPC) long-range weather outlook for April 2009, issued March 31, 2009, forecasts average precipitation for most of California, except the southeastern portion of the State where below average rainfall is forecasted.



California Weather-Hydro Conditions during April 2009

As of May 1, 2009, statewide hydrologic conditions were as follows: precipitation, 80 percent of average to date; runoff, 60 percent of average to date; and reservoir storage, 80 percent of average for the date. The snowpack was at about 65 percent of its average value for the date. Sacramento River unimpaired runoff observed through April 30, 2009 was about 8.6 million acre-feet (MAF), which is about 63 percent of average. (On April 30, 2008, the observed Sacramento River unimpaired runoff through that date was about 7.2 MAF or about 53 percent of average.) As of May 8, the Northern Sierra 8-Station Precipitation Index water year total to date was 44.9 inches, about 98 percent of the seasonal average and 90 percent of an average water year (50 inches).



% Avg


% Avg


2008 - 2009 Eureka 29.32 81 33.91 93 77






Avg Storage

% Average

Capacity

% Capacity



Trinity Lake Trinity 1,274 2,079 61 2,448 52 --- 1,174Shasta Lake Sacramento 3,155 3,987 79 4,552 69 -1,397 1,397Lake Oroville Feather 2,190 2,973 74 3,538 62 -1,269 1,348New Bullards Bar Res Yuba 910 779 117 966 94 -2 56Folsom Lake American 878 757 116 977 90 36 99New Melones Res Stanislaus 1,293 1,485 87 2,420 53 -977 1,127Don Pedro Res Tuolumne 1,485 1,481 100 2,030 73 -296 545Lake McClure Merced 546 635 86 1,025 53 -221 479Millerton Lake San Joaquin 504 374 135 520 97 115 16Pine Flat Res Kings 518 638 81 1,000 52 -285 482Isabella Kern 187 240 78 568 33 -253 381San Luis Res (Offstream) 921 1,829 50 2,039 45 --- 1,118 The latest National Weather Service Climate Prediction Center (CPC) long-range weather outlook for May 2009, issued April 30, 2009, forecasts above average precipitation for Central and Northern California. Average precipitation is forecast for Southern California.



California Weather-Hydro Conditions during May 2009

As of June 1, 2009, statewide hydrologic conditions were as follows: precipitation, 80 percent of average to date; runoff, 65 percent of average to date; and reservoir storage, 85 percent of average for the date. Sacramento River unimpaired runoff observed through May 31, 2009 was about 11.1 million acre-feet (MAF), which is about 70 percent of average. (On May 31, 2008, the observed Sacramento River unimpaired runoff through that date was about 8.8 MAF or about 55 percent of average.) As of June 1, the Northern Sierra 8-Station Precipitation Index water year total to date was 45.0 inches, about 95 percent of the seasonal average and 90 percent of an average water year (50 inches).



% Avg


% Avg





Avg Storage

% Average

Capacity

% Capacity



Trinity Lake Trinity 1,291 2,155 60 2,448 53 --- 1,157Shasta Lake Sacramento 3,110 3,955 79 4,552 68 -1,442 1,442Lake Oroville Feather 2,281 3,042 75 3,538 64 -1,257 1,257New Bullards Bar Res Yuba 928 833 111 966 96 -38 38Folsom Lake American 931 836 111 977 95 -46 46New Melones Res Stanislaus 1,333 1,501 89 2,420 55 -1,087 1,087Don Pedro Res Tuolumne 1,724 1,534 112 2,030 85 -105 306Lake McClure Merced 677 716 95 1,025 66 -101 348Millerton Lake San Joaquin 520 408 127 520 100 328 0Pine Flat Res Kings 742 724 103 1,000 74 -64 258Isabella Kern 250 295 85 568 44 -191 318San Luis Res (Offstream) 698 1,660 42 2,039 34 --- 1,341 The latest National Weather Service Climate Prediction Center (CPC) long-range weather outlook for June 2009, issued May 31, 2009, forecasts above average precipitation for Central and Northern California. Average precipitation is forecast for Southern California.



California Weather-Hydro Conditions during June 2009

As of July 1, 2009, statewide hydrologic conditions were as follows: precipitation, 85 percent of average to date; runoff, 65 percent of average to date; and reservoir storage, 85 percent of average for the date. Sacramento River unimpaired runoff observed through June 30, 2009 was about 11.9 million acre-feet (MAF), which is about 69 percent of average. (On June 30, 2008, the observed Sacramento River unimpaired runoff through that date was about 9.3 MAF or about 54 percent of average.) As of July 1, the Northern Sierra 8-Station Precipitation Index water year total to date was 46.3 inches, about 95 percent of the seasonal average to date and 93 percent of an average water year (50 inches). The total for June was 1.3 inches, about 130 of average for the month. Last year on July 1, the seasonal total to date was 34.9 inches, about 72 percent of the average to date.



% Avg


% Avg





Avg Storage

% Average

Capacity

% Capacity



Trinity Lake Trinity 1,264 2,125 59 2,448 52 --- 1,184Shasta Lake Sacramento 2,797 3,724 75 4,552 61 -1,755 1,755Lake Oroville Feather 2,057 2,942 70 3,538 58 -1,481 1,481New Bullards Bar Res Yuba 860 828 104 966 89 -106 106Folsom Lake American 855 830 103 977 88 -122 122New Melones Res Stanislaus 1,300 1,517 86 2,420 54 -1,120 1,120Don Pedro Res Tuolumne 1,761 1,600 110 2,030 87 -269 269Lake McClure Merced 663 752 88 1,025 65 -362 362Millerton Lake San Joaquin 520 415 125 520 100 0 0Pine Flat Res Kings 605 696 87 1,000 61 -395 395Isabella Kern 234 308 76 568 41 -248 334San Luis Res (Offstream) 351 1,350 26 2,039 17 --- 1,688 The latest National Weather Service Climate Prediction Center (CPC) long-range weather outlook for July 2009, issued June 30, 2009, forecasts average precipitation for all of California.



California Weather-Hydro Conditions during July 2009 As of August 1, 2009, statewide hydrologic conditions were as follows: precipitation, 85 percent of average to date; runoff, 65 percent of average to date; and reservoir storage, 80 percent of average for the date. Sacramento River unimpaired runoff observed through July 31, 2009 was about 12.3 million acre-feet (MAF), which is about 69 percent of average. (On June 30, 2008, the observed Sacramento River unimpaired runoff through that date was about 9.7 MAF or about 54 percent of average.)

As of August 1, the Northern Sierra 8-Station Precipitation Index water year total to date was 46.3 inches, about 95 percent of the seasonal average to date and 93 percent of an average water year (50 inches). Last year on August 1, the seasonal total to date was 34.9 inches, about 72 percent of the average to date.


City

Jul 1 to Date

2008 - 2009

(in inches)

%

Avg

Jul 1 to Date

2007 - 2008

(in inches)

%

Avg

% Avg “Water Year”

Jul 1 to Jun 30

2008 - 2009

Eureka 0.07 37 0.02 11 0 Redding 0.00 0 0.00 0 0 Sacramento 0.00 0 0.00 0 0 San Francisco 0.00 0 0.00 0 0 Fresno 0.00 0 0.01 100 0 Bakersfield 0.00 0 0.00 0 0 Los Angeles 0.00 0 0.00 0 0 San Diego 0.00 0 0.00 0 0



Avg Storage

%

Average

Capacity

%

Capacity

Flood Control

Encroachment

Total Space

Available

Trinity Lake Trinity 1,145 1,987 58 2,448 47 --- 461 Shasta Lake Sacramento 2,311 3,309 70 4,552 51 -2,241 1,243 Lake Oroville Feather 1,540 2,629 59 3,538 44 -1,998 909 New Bullards Bar Res Yuba 755 749 101 966 78 -211 217 Folsom Lake American 593 706 84 977 61 -384 271 New Melones Res Stanislaus 1,222 1,451 84 2,420 51 -1,198 969 Don Pedro Res Tuolumne 1,624 1,533 106 2,030 80 -406 497 Lake McClure Merced 575 678 85 1,025 56 -449 347 Millerton Lake San Joaquin 425 323 132 520 82 -95 197 Pine Flat Res Kings 342 514 67 1,000 34 -658 486 Isabella Kern 177 267 66 568 31 -387 301 San Luis Res (Offstream) 382 1,029 37 2,039 19 --- 1,010 The latest National Weather Service Climate Prediction Center (CPC) long-range weather outlook for August 2009, issued June 31, 2009, forecasts average precipitation for all of California, except the far northwestern corner of the State, where above average precipitation is forecasted.



California Weather-Hydro Conditions during August 2009

As of September 1, 2009, statewide hydrologic conditions were as follows: precipitation, 85 percent of average to date; runoff, 65 percent of average to date; and reservoir storage, 80 percent of average for the date. Sacramento River unimpaired runoff observed through August 31, 2009 was about 12.6 million acre-feet (MAF), which is about 69 percent of average. (On August 31, 2008, the observed Sacramento River unimpaired runoff through that date was about 10.0 MAF, or about 55 percent of average.) As of September 1, the Northern Sierra 8-Station Precipitation Index water year total to date was 46.5 inches, about 95 percent of the seasonal average to date and 93 percent of an average water year (50 inches). Last year on August 1, the seasonal total to date was 34.9 inches, about 71 percent of the average to date.


City

Jul 1 to Date

2008 - 2009

(in inches)

%

Avg

Jul 1 to Date

2007 - 2008

(in inches)

%

Avg


Jul 1 to Jun 30

2008 - 2009




Avg Storage

%

Average

Capacity

%

Capacity

Flood Control

Encroachment

Total Space

Available

Trinity Lake Trinity 1,025 1,839 56 2,448 42 --- 1,423 Shasta Lake Sacramento 1,936 2,966 65 4,552 43 -2,616 2,616 Lake Oroville Feather 1,383 2,377 58 3,538 39 -2,155 2,155 New Bullards Bar Res Yuba 652 653 100 966 68 -314 314 Folsom Lake American 452 621 73 977 46 -525 525 New Melones Res Stanislaus 1,158 1,374 84 2,420 48 -1,262 1,262 Don Pedro Res Tuolumne 1,513 1,427 106 2,030 75 -517 517 Lake McClure Merced 495 584 85 1,025 48 -530 530 Millerton Lake San Joaquin 351 230 153 520 67 -170 169 Pine Flat Res Kings 212 387 55 1,000 21 -788 788 Isabella Kern 131 212 62 568 23 -303 437 San Luis Res (Offstream) 402 890 45 2,039 20 --- 1,637 The latest National Weather Service Climate Prediction Center (CPC) long-range weather outlook for September 2009, issued August 31, 2009, forecasts average precipitation for all of California, except for the northern of portion of the State, where below average precipitation is forecasted.



California Weather-Hydro Conditions during September 2009

As of September 30, 2009, the end of Water Year 2009, statewide hydrologic conditions were as follows: precipitation, 80 percent of average to date; runoff, 65 percent of average to date; and reservoir storage, 80 percent of average for the date. Sacramento River unimpaired runoff observed through September 30, 2009 was about 12.9 million acre-feet (MAF), which is about 69 percent of average. (On September 30, 2008, the observed Sacramento River unimpaired runoff through that date was about 10.3 MAF, or about 55 percent of average.) As of September 30, the Northern Sierra 8-Station Precipitation Index Water Year total was 46.6 inches, 93 percent of an average water year (50 inches). Last year on September 30 (the end of Water Year 2008), the seasonal total to date was 34.9 inches, 70 percent of an average water year.


City

Jul 1 to Date

2008 - 2009

(in inches)

%

Avg

Jul 1 to Date

2007 - 2008

(in inches)

%

Avg


Jul 1 to Jun 30

2008 - 2009




Avg Storage

%

Average

Capacity

%

Capacity

Flood Control

Encroachment

Total Space

Available

Trinity Lake Trinity 919 1,700 54 2,448 38 --- 1,529 Shasta Lake Sacramento 1,774 2,810 63 4,552 39 -2,778 2,778 Lake Oroville Feather 1,337 2,252 59 3,538 38 -2,014 2,201 New Bullards Bar Res Yuba 614 590 104 966 64 -297 352 Folsom Lake American 412 558 74 977 42 -565 565 New Melones Res Stanislaus 1,108 1,331 83 2,420 46 -1,165 1,312 Don Pedro Res Tuolumne 1,443 1,363 106 2,030 71 -329 587 Lake McClure Merced 432 509 85 1,025 42 -420 593 Millerton Lake San Joaquin 350 203 173 520 67 -170 170 Pine Flat Res Kings 200 348 57 1,000 20 -800 800 Isabella Kern 102 184 55 568 18 -202 466 San Luis Res (Offstream) 421 993 42 2,039 21 --- 1,618 The latest National Weather Service Climate Prediction Center (CPC) long-range weather outlook for October 2009, issued September 30, 2009, forecasts average precipitation for all of California.



California Weather-Hydro Conditions during October 2009

As of October 31, 2009, the end of the first month of Water Year 2010, statewide hydrologic conditions were as follows: precipitation, 185 percent of average to date; runoff, 120 percent of average to date; and reservoir storage, 80 percent of average for the date. Sacramento River unimpaired runoff observed through October 31, 2009 was about 0.5 million acre-feet (MAF), which is about 100 percent of average. (On October 31, 2008, the observed Sacramento River unimpaired runoff through that date was about 0.3 MAF, or about 65 percent of average.) On October 31, the Northern Sierra 8-Station Precipitation Index Water Year total was 4.6 inches, about 153 percent of the seasonal average to date (and for the month of October) and about 9 percent of an average water year (50 inches). Last year on October 31, the seasonal total to date was 3.1 inches, about 103 percent of the seasonal average to date. October was cooler and much wetter than normal for most of California. An unusually strong, early-season storm, pushed monthly rainfall totals for many locations to well above normal. This mid-month storm was accompanied by strong winds and intense rain.


City

Jul 1 to Date

2009 - 2009

(in inches)

%

Avg

Jul 1 to Date

2008 - 2008

(in inches)

%

Avg


Jul 1 to Jun 30

2009 - 2010




Avg Storage

%

Average

Capacity

%

Capacity

Flood Control

Encroachment

Total Space

Available

Trinity Lake Trinity 905 1,612 56 2,448 37 --- 1,543 Shasta Lake Sacramento 1,704 2,755 62 4,552 37 -2,166 2,848 Lake Oroville Feather 1,289 2,165 60 3,538 36 -1,874 2,249 New Bullards Bar Res Yuba 585 532 110 966 61 -211 381 Folsom Lake American 344 495 70 977 35 -372 633 New Melones Res Stanislaus 1,105 1,303 85 2,420 46 -865 1,315 Don Pedro Res Tuolumne 1,414 1,297 109 2,030 70 -276 616 Lake McClure Merced 411 450 91 1,025 40 -263 614 Millerton Lake San Joaquin 322 189 170 520 62 -114 198 Pine Flat Res Kings 267 351 76 1,000 27 -579 733 Isabella Kern 103 158 65 568 18 -67 465 San Luis Res (Offstream) 513 1,110 46 2,039 25 --- 1,526 The latest National Weather Service Climate Prediction Center (CPC) long-range weather outlook for November 2009, issued October 31, 2009, forecasts above average precipitation for most of Northern and Central California. Average precipitation is expected for the rest of the State.



California Weather-Hydro Conditions during November 2009

As of November 30, 2009, statewide hydrologic conditions were as follows: precipitation, 75 percent of average to date; runoff, 70 percent of average to date; and reservoir storage, 75 percent of average for the date. Sacramento River unimpaired runoff observed through November 30, 2009 was about 0.9 million acre-feet (MAF), which is about 66 percent of average. (On November 30, 2008, the observed Sacramento River unimpaired runoff through that date was also about 0.9 MAF, or about 66 percent of average.) On November 30, the Northern Sierra 8-Station Precipitation Index Water Year total was 6.9 inches, about 74 percent of the seasonal average to date and about 14 percent of an average water year (50 inches). Last year on November 30, the seasonal total to date was 8.6 inches, about 92 percent of the seasonal average to date. In general, November was dry and mild across California. The Northern Sierra 8-Station Index had just 2.2 inches of precipitation, about 35 percent of normal. Temperatures were near average for most of the State.


City

Jul 1 to Date

2009 - 2009

(in inches)

%

Avg

Jul 1 to Date

2008 - 2008

(in inches)

%

Avg


Jul 1 to Jun 30

2009 - 2010




Avg Storage

%

Average

Capacity

%

Capacity

Flood Control

Encroachment

Total Space

Available

Trinity Lake Trinity 900 1,614 56 2,448 37 --- 1,548 Shasta Lake Sacramento 1,674 2,777 60 4,552 37 -1,578 2,878 Lake Oroville Feather 1,137 2,192 52 3,538 32 -2,026 2,401 New Bullards Bar Res Yuba 554 523 106 966 57 -242 412 Folsom Lake American 284 467 61 977 29 -293 693 New Melones Res Stanislaus 1,116 1,318 85 2,420 46 -854 1,304 Don Pedro Res Tuolumne 1,407 1,311 107 2,030 69 -283 623 Lake McClure Merced 403 449 90 1,025 39 -271 622 Millerton Lake San Joaquin 190 218 87 520 37 -238 330 Pine Flat Res Kings 285 376 76 1,000 28 -347 715 Isabella Kern 102 150 68 568 18 -68 466 San Luis Res (Offstream) 605 1,247 49 2,039 30 --- 1,434 The latest National Weather Service Climate Prediction Center (CPC) long-range weather outlook for December 2009, issued November 30, 2009, forecasts above average precipitation for almost all of California. Average precipitation is expected for the extreme southeastern portion of the State.



California Weather-Hydro Conditions during December 2009

As of December 31, 2009, statewide hydrologic conditions were as follows: precipitation, 85 percent of average to date; runoff, 40 percent of average to date; and reservoir storage, 75 percent of average for the date. Sacramento River unimpaired runoff observed through December 31, 2009 was about 1.5 million acre-feet (MAF), which is about 47 percent of average. For comparison, on December 31, 2008, the observed Sacramento River unimpaired runoff through that date was about 1.4 MAF, or about 44 percent of average. On December 31, the Northern Sierra 8-Station Precipitation Index Water Year total was 13.6 inches, about 77 percent of the seasonal average to date and about 26 percent of an average water year (50 inches). Last year on December 31, 2008, the seasonal total to date was 14.6 inches, about 82 percent of the seasonal average to date. In general, December was wetter in the central and southern portions of the State. On December 31, the southern Sierra had about 100 percent of normal snow water equivalent. In contrast, the northern Sierra, the snowpack was about 80 percent of normal. By January 7, the San Joaquin 5-Station Precipitation Index had about 100 percent of the seasonal total to date, as opposed to about 70 percent in the Northern Sierra.

.


City

Jul 1 to Date

2009 - 2010

(in inches)

%

Avg

Jul 1 to Date

2008 - 2009

(in inches)

%

Avg


Jul 1 to Jun 30

2009 - 2010




Avg Storage

%

Average

Capacity

%

Capacity

Flood Control

Encroachment

Total Space

Available

Trinity Lake Trinity 909 1,668 54 2,448 37 --- 1,539 Shasta Lake Sacramento 1,777 2,897 61 4,552 39 -1,594 2,775 Lake Oroville Feather 1,030 2,226 46 3,538 29 -2,093 2,508 New Bullards Bar Res Yuba 546 537 102 966 57 -250 420 Folsom Lake American 264 479 55 977 27 -313 713 New Melones Res Stanislaus 1,165 1,344 87 2,420 48 -805 1,255 Don Pedro Res Tuolumne 1,427 1,329 107 2,030 70 -263 603 Lake McClure Merced 408 454 90 1,025 40 -266 617 Millerton Lake San Joaquin 207 278 75 520 40 -218 313 Pine Flat Res Kings 340 418 81 1,000 34 -316 660 Isabella Kern 111 154 72 568 19 -59 457 San Luis Res (Offstream) 874 1,401 62 2,039 43 --- 1,165 The latest National Weather Service Climate Prediction Center (CPC) long-range weather outlook for January 2010, issued December 31, 2009, forecasts above average precipitation for the southern two-thirds of California. Average precipitation is expected for the northern third of the State.



Documents

California Weather-Hydro Conditions during January 2009 · PDF fileacre-feet (MAF), which is about 36 percent of average. ... 635 : 86 . 1,025 : 53 -221 : 479. Millerton Lake : San