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Weekly Weather Briefing: Isaac 08/30/2012 www.srh.noaa.gov/shv/briefing. Brandi Richardson Meteorologist. National Weather Service Shreveport, Louisiana. Preview. Current Observations Center east of LaSalle Parish M otion is north-northwestward Official Isaac Forecast - PowerPoint PPT Presentation
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Weekly Weather Briefing:Weekly Weather Briefing:IsaacIsaac
08/30/201208/30/2012
www.srh.noaa.gov/shv/briefingwww.srh.noaa.gov/shv/briefing
Brandi RichardsonBrandi RichardsonMeteorologistMeteorologist
National Weather Service Shreveport, LouisianaNational Weather Service Shreveport, Louisiana
Preview Current ObservationsCurrent Observations
Center east of LaSalle ParishCenter east of LaSalle Parish Motion is north-northwestwardMotion is north-northwestward
Official Isaac ForecastOfficial Isaac Forecast Slightly east of Wednesday’s forecast trackSlightly east of Wednesday’s forecast track Becoming a Depression todayBecoming a Depression today Impacts looking more on the minimal sideImpacts looking more on the minimal side Model DataModel Data Several models still on a more westward trackSeveral models still on a more westward track
Needs to take a strong northwestward turnNeeds to take a strong northwestward turn
Through WednesdayThrough Wednesday
National Weather Service Shreveport, LouisianaNational Weather Service Shreveport, Louisiana
Current ObservationsCurrent Observations
Power Outages
Numerous reports of
wind damage
Radar ImageryRadar Imagery
Observed RainfallObserved Rainfall
0.85
0.64
0.05
0.40
0.03
0.06
0.57
Official NHC Track ForecastOfficial NHC Track Forecast
Wednesday morning
Latest trackforecast(shifted
a hair eastward)
Official Rainfall ForecastOfficial Rainfall Forecast
Locally higher totals may be possible
3-5
”
2-3
”
1-2”
TodayToday
TonigTonightht
Official Forecast Official Forecast Impacts: Impacts: FloodingFlooding S AR, Extreme N Central LAS AR, Extreme N Central LA
Greatest risk for floodingGreatest risk for flooding Today PM-Fri AMToday PM-Fri AM
SW AR, Parts of NW LASW AR, Parts of NW LA De Queen/Nashville – De Queen/Nashville –
Bienville/JonesboroBienville/Jonesboro Today early PM-Fri AMToday early PM-Fri AM
Central LACentral LA Natchitoches/Coushatta – Natchitoches/Coushatta –
Columbia/JenaColumbia/Jena TodayToday
Flash
Flo
odin
g
Fla
sh F
loodin
g
Possib
le
Possib
le
Official Forecast Official Forecast Impacts: Impacts: WindsWinds1 PM 1 PM TodayToday Tropical Tropical
Storm force Storm force windswinds
N Central LA N Central LA ~35-40 mph~35-40 mph Today, Today,
decreasing this decreasing this afternoonafternoon
SW AR/SE OK SW AR/SE OK 25-30 mph25-30 mph TonightTonight
E TXE TX 20-25 mph 20-25 mph TodayToday
3 PM 3 PM TodayToday
Official Forecast Official Forecast Impacts: Impacts: TornadoesTornadoes
Thu AM – Fri AM
N Central N Central LA/S AR LA/S AR Most at riskMost at risk Quick spin-Quick spin-
upsups Not much Not much
lead timelead time
ElsewhereElsewhere Can’t rule it Can’t rule it
out, but very out, but very low risklow risk
Watches/Warnings/Watches/Warnings/AdvisoriesAdvisories
Flash Flood Flash Flood WatchWatch
Now - 7 Now - 7 PM PM
TonightTonight
Topical Topical Storm Storm
WarningWarningFlash Flood Flash Flood
WatchWatchNow - 7 PM Now - 7 PM
TonightTonight
UncertaintyUncertainty
Current Current motion motion makes makes
these model these model tracks less tracks less probableprobable
Still several Still several models models
indicating a indicating a move towards move towards
the NWthe NW
The Rest of the ForecastThe Rest of the Forecast
HH
7 PM Friday
The Rest of the ForecastThe Rest of the Forecast
HH7 PM Saturday
The Rest of the ForecastThe Rest of the Forecast
HH
1 PM Monday
Summary Current ObservationsCurrent Observations
Center just east of LaSalle ParishCenter just east of LaSalle Parish Three-hour motion is due-NThree-hour motion is due-N
Official Isaac ForecastOfficial Isaac Forecast Slightly east of Wednesday’s forecast trackSlightly east of Wednesday’s forecast track Becoming a Depression todayBecoming a Depression today Impacts looking more on the minimal sideImpacts looking more on the minimal side Model DataModel Data Several models still on a more westward trackSeveral models still on a more westward track
Needs to take a strong northwestward turn to verifyNeeds to take a strong northwestward turn to verify
Through WednesdayThrough Wednesday Ridge is squeezed southeastward around Isaac and Ridge is squeezed southeastward around Isaac and
back into the Desert SWback into the Desert SW Region remains under the influence of the ridgeRegion remains under the influence of the ridge
National Weather Service Shreveport, LouisianaNational Weather Service Shreveport, Louisiana
NEXT CONFERENCE CALL:
Thursday September 6, 2012 @ 10 AMThursday September 6, 2012 @ 10 AM
www.srh.noaa.gov/shv/briefingwww.srh.noaa.gov/shv/briefing
National Weather Service Shreveport, LouisianaNational Weather Service Shreveport, Louisiana
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