Alert archive / Florida / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 35, NWS Jacksonville, FL

April 30, 20104 counties in Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 30, 2010, 10:54 PM EDT for 4 counties in Florida. It was in force for 51 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: Apr 30, 2010, 10:54 PM EDT (02:54 UTC)
Expired: Apr 30, 2010, 11:45 PM EDT
In force: 51 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

Counties Alachua County, FL, Bradford County, FL, Clay County, FL, Putnam County, FL

The radar

The Jacksonville radar (KJAX), 82 km from the middle of the area, began a volume at 02:57 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 00:00Z, 2.9 hours before the alert went out and 84 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: 265 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 820 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 142 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

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 Apr 30, 8:49 PM EDT, 2 hours 5 minutes earlier.

Area forecast discussion, Apr 30, 8:49 PM EDT, 2 hours 5 minutes before

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Hazardous weather outlook, Apr 30, 4:53 AM EDT, 18 hours 1 minute before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
453 AM EDT FRI APR 30 2010

FLZ020>025-030>033-035>038-040-GAZ132>136-149>154-162>166-010900-
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-
453 AM EDT FRI APR 30 2010

THIS OUTLOOK IS FOR NORTHEAST FLORIDA AND SOUTHEAST GEORGIA.

.DAY ONE...TODAY AND TONIGHT...

ISOLATED THUNDERSTORMS WILL BE POSSIBLE ALONG THE INTERSTATE 75
CORRIDOR THIS AFTERNOON AND THEN FARTHER EAST CLOSER TO THE
INTERSTATE 95 CORRIDOR EARLY THIS EVENING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...

ISOLATED THUNDERSTORMS WILL BE POSSIBLE OVER THE INTERIOR SATURDAY
AFTERNOON.

GREATER COVERAGE OF THUNDERSTORMS EXPECTED TUESDAY INTO WEDNESDAY
IN ASSOCIATION WITH THE NEXT FRONTAL SYSTEM.

.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.

JDS

In the hours before

Local storm report, Apr 30, 9:02 PM EDT, 1 hour 52 minutes before

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Special weather statement, Apr 30, 9:24 PM EDT, 1 hour 30 minutes before

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Local storm report, Apr 30, 10:47 PM EDT, 7 minutes before

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Local storm report, Apr 30, 10:50 PM EDT, 4 minutes before

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Local storm report, Apr 30, 10:52 PM EDT, 2 minutes before

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Local storm report, Apr 30, 10:53 PM EDT, 1 minute 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
Apr 30, 8:21 PM EDT	Tornado Warning	JAX	Alachua, Bradford, Columbia, Union	39 min
Apr 30, 9:00 PM EDT	Special Weather Statement	JAX	Union	45 min
Apr 30, 9:24 PM EDT	Special Weather Statement	JAX	Alachua, Bradford	51 min
Apr 30, 9:32 PM EDT	Areal Flood Advisory	JAX	Alachua, Columbia, Gilchrist, Suwannee, Union	118 min
Apr 30, 10:08 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Bradford	52 min
Apr 30, 11:47 PM EDT	Special Weather Statement	JAX	Clay	58 min
May 1, 12:12 AM EDT	Special Weather Statement	JAX	Bradford	48 min
May 1, 2:00 AM EDT	Areal Flood Advisory	JAX	Baker, Columbia, Union	90 min
May 1, 7:09 PM EDT	Special Weather Statement	JAX	Duval	36 min
May 1, 7:51 PM EDT	Special Weather Statement	JAX	Nassau	24 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.