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TROPICAL STORM ISAIAS
By Climate Impact Company
August 2, 2020 3:00PM EDT
ISAIAS BRINGS FLASH FLOODING TO BGE
• At 2PM EDT Tropical Storm Isaias was located at 27.4N/79.7W or 45 mi. east-
southeast of Vero Beach, FL.
• Isaias is moving north-northwest at 9 mph with top wind 65 mph and surface pressure
995 MB.
• Comment: Isaias looks stronger. Usually recurving TC’s temporarily strengthen.
NOAA/NHC underestimating intensity for Southeast coast (and possibly Mid-Atlantic).
• Baltimore Gas and Electric can expect an ALERT 4 episode due to excessive rainfall
(4-7 in.). Maximum wind gust is forecast at 50 mph (ALERT 2).
• Onset of weather associated with Isaias is Monday evening, peaking Tuesday daytime
and abating late Tuesday.
LATEST NOAA FORECAST TRACKNOAA 5-day forecast with
caveats…
Tropical storm force wind profile
forecast…
TUESDAY IS THE PRIMARY FLOOD RISK DAY
NOAA Tuesday rainfall forecast…
NOAA Tuesday flash flood risk
forecast…
BGE WEATHER SCORECARD FOR T.S. ISAIAS
Time Weather Hazards Wind/Gust Alert
6PM MON to Midn Showers/Storms
(1 in. by midn)
None S 5-15 Borderline ALERT
1 (rain)
Midn to 6AM TUE Heavy rain/Storms
(1-2 in.)
Flooding
developing
E 8-18 Borderline ALERT
3 (rain)
6AM TUE to Noon Heavy rain/Storms
1-2 in. of rain
Wind/Flooding NE to N 16-27G45 ALERT 4 (rain)
Noon to 6PM TUE Heavy rain (1-2
in.)
Wind/Flooding NW to W 20-33
G40-50
ALERT 4 (rain)
6PM TUE to Midn Few showers Wind/Flood abate W to SW 8-18 ALL CLEAR 9PM
Storm Totals 4-7 in. rain Wind
damage/Flooding
Max gust 50 mph
Noon-2PM TUE
An ALERT 4 Event