Some extreme winds at higher levels in the storm
Posted by
Chris in Tampa on 8/26/2020, 8:03 pm
Direct link to dropsonde:
http://hurricanecity.com/recon/recon.cgi?basin=al&year=2020&product=sonde&storm=Laura&mission=24&agency=NOAA&ob=08-26-2301-09-947-179-128
Sonde splashed down at 6:09pm CDT so this should have been factored in to intermediate advisory.
Mean Boundary Level Wind (mean wind in the lowest 500 geopotential meters of the sounding):
- Wind Direction: 35° (from the NE)
- Wind Speed: 143 knots (165 mph)
Deep Layer Mean Wind (average wind over the depth of the sounding):
- Wind Direction: 85° (from the E)
- Wind Speed: 107 knots (123 mph)
- Depth of Sounding: From 686mb to 946mb
Average Wind Over Lowest Available 150 geopotential meters (gpm) of the sounding:
- Lowest 150m: 155 gpm - 5 gpm (509 geo. feet - 16 geo. feet)
- Wind Direction: 35° (from the NE)
- Wind Speed: 137 knots (158 mph)
Highest wind measured on the way down was at 830mb level with a momentary gust of 179 knots (206 mph). Those might be half second winds. Or maybe quarter second. Not sure. As sonde falls from plane to surface it measures wind constantly.
For comparison, highest wind measured on the way down in Dorian was 224 mph. Highest wind measured on the way down in Michael was 186 mph. Of course they don't always capture the strongest winds.
Highest Flt. Lvl. Wind (30s Avg.) so far in Laura:
138 kts (158.8 mph)
Highest SFMR Peak (10s Avg.) Sfc. Wind so far in Laura:
133 kts (153.1 mph)
Highest Flt. Lvl. Wind (30s Avg.) in Michael:
150 kts (173 mph)
Highest SFMR Peak (10s Avg.) Sfc. Wind in Michael:
125 kts (144 mph)
Highest Flt. Lvl. Wind (30s Avg.) in Dorian:
158 kts (182 mph)
Highest SFMR Peak (10s Avg.) Sfc. Wind in Dorian:
177 knots (204 mph) ... which seems high ... so use this reading cautiously
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In this thread:
7pm CDT Wed: 150mph; 940mb; Catastrophic storm surge, extreme winds, & flash flooding expected along NW Gulf tonight -
Chris in Tampa,
8/26/2020, 7:50 pm- Air Force sonde at 9:16pm CDT Wed: 941mb with 15 knots of surface wind - Chris in Tampa, 8/26/2020, 10:45 pm
- NOAA sonde at 9:15pm CDT Wed: 940mb with 7 knots of surface wind - Chris in Tampa, 8/26/2020, 10:37 pm
- Recon image through 9:01pm CDT Wednesday: Two planes inbound to eye - Chris in Tampa, 8/26/2020, 10:08 pm
- 9pm CDT Wednesday position update: 150mph; 937mb - Chris in Tampa, 8/26/2020, 10:02 pm
- Image showing locations of where The Weather Channel people are - Chris in Tampa, 8/26/2020, 9:37 pm
- 8:02pm CDT sonde: 938mb with 11 knots of surface wind - Chris in Tampa, 8/26/2020, 9:21 pm
- 8pm CDT Wed Position Update: 150mph; 937mb; Possible tornadoes occurring in Laura's outer bands in parts of LA/MS - Chris in Tampa, 8/26/2020, 9:00 pm
- Northern quadrant, due north, had flight level winds 1kt higher, same SFMR surface wind estimates, seen in NE quadrant - Chris in Tampa, 8/26/2020, 8:49 pm
- 7:15pm CDT sonde: 940mb with 30 knots of surface wind - Chris in Tampa, 8/26/2020, 8:39 pm
- Some extreme winds at higher levels in the storm - Chris in Tampa, 8/26/2020, 8:03 pm
- Re: 7pm CDT Wed: 150mph; 940mb; Catastrophic storm surge, extreme winds, & flash flooding expected along NW Gulf tonight - LawKat, 8/26/2020, 7:54 pm
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