Alert archive / Florida / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 151, NWS Jacksonville, FL

July 31, 2010Clay County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jul 31, 2010, 2:05 PM EDT for Clay County, Florida. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 31, 2010, 2:05 PM EDT (18:05 UTC)
Expired: Jul 31, 2010, 2:45 PM EDT
In force: 40 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

County Clay County, FL

The radar

The Jacksonville radar (KJAX), 58 km from the middle of the area, began a volume at 18:04 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 6.1 hours before the alert went out and 59 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 3802 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 749 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jacksonville, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 31, 9:35 AM EDT, 4 hours 30 minutes earlier.

Area forecast discussion, Jul 31, 9:35 AM EDT, 4 hours 30 minutes before

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Hazardous weather outlook, Jul 31, 11:41 AM EDT, 2 hours 24 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE JACKSONVILLE FL
1141 AM EDT SAT JUL 31 2010

FLZ020>025-030>033-035>038-040-GAZ132>136-149>154-162>166-011000-
HAMILTON-SUWANNEE-COLUMBIA-BAKER-NASSAU-DUVAL-UNION-BRADFORD-CLAY-
ST JOHNS-GILCHRIST-ALACHUA-PUTNAM-FLAGLER-MARION-COFFEE-
JEFF DAVIS-BACON-APPLING-WAYNE-ATKINSON-WARE-PIERCE-BRANTLEY-
INLAND GLYNN-COASTAL GLYNN-ECHOLS-CLINCH-CHARLTON-INLAND CAMDEN-
COASTAL CAMDEN-
1141 AM EDT SAT JUL 31 2010

THIS OUTLOOK IS FOR NORTHEAST FLORIDA AND SOUTHEAST GEORGIA.

.DAY ONE...REST OF TODAY AND TONIGHT...

...HEAT ADVISORY IN EFFECT FOR SOUTHEAST GEORGIA AND MOST OF
NORTHEAST FLORIDA THROUGH 7 PM TODAY...

A HEAT ADVISORY IS IN EFFECT UNTIL 7 PM FOR ALL OF SOUTHEAST
GEORGIA AND MOST OF NORTHEAST FLORIDA. MORE DETAILS CAN BE
FOUND IN THE URGENT WEATHER MESSAGE.

SCATTERED THUNDERSTORMS ARE EXPECTED ACROSS NORTHEAST FLORIDA
AND SOUTHEAST GEORGIA THIS AFTERNOON. THE MAIN CONCERNS WITH
BE EXCESSIVE LIGHTNING AND STRONG DOWNBURST WINDS ALONG WITH VERY
HEAVY RAINFALL. STORM MOTION WILL BE GENERALLY SOUTH AROUND 5 TO
10 MPH.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

OPPRESSIVE TEMPERATURES AND HEAT INDICES NEAR 110 DEGREES ARE
POSSIBLE IN SOME AREAS ON SUNDAY AND MONDAY. ADDITIONAL HEAT
ADVISORIES MAY BE NEEDED WITH SUBSEQUENT FORECASTS.

SCATTERED THUNDERSTORMS ARE EXPECTED EACH DAY MAINLY DURING THE
AFTERNOON AND EVENING. THE STRONGER STORMS WILL BE CAPABLE OF
EXCESSIVE CLOUD TO GROUND LIGHTNING AND GUSTY WINDS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT REQUESTED AT THIS TIME.

FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE
IN JACKSONVILLE WEBSITE ON THE INTERNET AT WEATHER.GOV/JAX.

ECZ

In the hours before

Special weather statement, Jul 31, 1:18 PM EDT, 47 minutes before

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Special weather statement, Jul 31, 1:19 PM EDT, 46 minutes before

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Special weather statement, Jul 31, 1:32 PM EDT, 33 minutes before

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Special weather statement, Jul 31, 1:33 PM EDT, 32 minutes before

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Special weather statement, Jul 31, 1:53 PM EDT, 12 minutes before

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Special weather statement, Jul 31, 1:56 PM EDT, 9 minutes before

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The office that day

Everything else NWS Jacksonville, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 31, 1:18 PM EDT	Special Weather Statement	JAX	Suwannee	42 min
Jul 31, 1:19 PM EDT	Special Weather Statement	JAX	Suwannee	41 min
Jul 31, 1:32 PM EDT	Special Weather Statement	JAX	Baker	28 min
Jul 31, 1:33 PM EDT	Special Weather Statement	JAX	Clay	27 min
Jul 31, 1:53 PM EDT	Special Weather Statement	JAX	Baker	37 min
Jul 31, 1:56 PM EDT	Special Weather Statement	JAX	Suwannee	49 min
Jul 31, 2:15 PM EDT	Areal Flood Advisory	JAX	Baker, Clay, Duval, Nassau	105 min
Jul 31, 2:16 PM EDT	Areal Flood Advisory	JAX	Duval, Nassau	104 min
Jul 31, 2:33 PM EDT	Special Weather Statement	JAX	Clay, Duval	42 min
Jul 31, 2:40 PM EDT	Special Weather Statement	JAX	Clay	50 min
Jul 31, 3:21 PM EDT	Severe Thunderstorm Warning	JAX	Duval, Nassau	39 min
Jul 31, 3:27 PM EDT	Special Weather Statement	JAX	Saint Johns	48 min
Jul 31, 3:31 PM EDT	Special Weather Statement	JAX	Bradford, Clay, Union	59 min
Jul 31, 3:48 PM EDT	Areal Flood Advisory	JAX	Duval, Nassau	117 min
Jul 31, 4:09 PM EDT	Special Weather Statement	JAX	Alachua, Bradford, Gilchrist	51 min
Jul 31, 4:30 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Bradford, Marion	45 min
Jul 31, 4:36 PM EDT	Areal Flood Advisory	JAX	Alachua, Bradford, Columbia, Union	84 min
Jul 31, 4:40 PM EDT	Areal Flood Advisory	JAX	Alachua	95 min
Jul 31, 5:16 PM EDT	Special Weather Statement	JAX	Marion	44 min
Jul 31, 5:36 PM EDT	Special Weather Statement	JAX	Marion	39 min
Jul 31, 5:44 PM EDT	Areal Flood Advisory	JAX	Alachua, Marion	91 min
Jul 31, 6:21 PM EDT	Special Weather Statement	JAX	Marion	54 min
Jul 31, 6:31 PM EDT	Areal Flood Advisory	JAX	Marion	89 min
Jul 31, 3:22 PM EDT	Special Weather Statement	JAX	Wayne	38 min
Jul 31, 3:38 PM EDT	Severe Thunderstorm Warning	JAX	Appling, Brantley, Pierce, Wayne	52 min
Jul 31, 4:03 PM EDT	Special Weather Statement	JAX	Charlton	42 min
Jul 31, 4:20 PM EDT	Special Weather Statement	JAX	Clinch	40 min
Jul 31, 4:23 PM EDT	Special Weather Statement	JAX	Jeff Davis	37 min
Jul 31, 4:47 PM EDT	Special Weather Statement	JAX	Appling, Jeff Davis	43 min
Jul 31, 4:50 PM EDT	Special Weather Statement	JAX	Brantley	40 min
Jul 31, 4:58 PM EDT	Special Weather Statement	JAX	Clinch	47 min
Jul 31, 5:12 PM EDT	Special Weather Statement	JAX	Coffee	33 min
Jul 31, 5:20 PM EDT	Severe Thunderstorm Warning	JAX	Appling, Bacon, Coffee, Jeff Davis	40 min
Jul 31, 5:47 PM EDT	Special Weather Statement	JAX	Atkinson	43 min
Jul 31, 6:03 PM EDT	Areal Flood Advisory	JAX	Bacon, Coffee, Jeff Davis	87 min
Jul 31, 6:03 PM EDT	Special Weather Statement	JAX	Atkinson	42 min
Jul 31, 6:23 PM EDT	Special Weather Statement	JAX	Atkinson	37 min
Jul 31, 6:44 PM EDT	Special Weather Statement	JAX	Clinch	31 min

Nearby

Severe Thunderstorm Warnings in Florida, 2010 Every severe thunderstorm warning in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.