Alert archive / Florida / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 137, NWS Jacksonville, FL

July 14, 2007Clay County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jul 14, 2007, 12:47 PM EDT for Clay County, Florida. It was in force for 43 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 14, 2007, 12:47 PM EDT (16:47 UTC)
Expired: Jul 14, 2007, 1:30 PM EDT
In force: 43 min
Issued by: NWS Jacksonville, FL
Area: Counties, with a storm outline in the text

County Clay County, FL

The radar

The Jacksonville radar (KJAX), 58 km from the middle of the area, began a volume at 16:48 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 4.8 hours before the alert went out and 239 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: 1563 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 779 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 63 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 14, 9:15 AM EDT, 3 hours 32 minutes earlier.

Area forecast discussion, Jul 14, 9:15 AM EDT, 3 hours 32 minutes before

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Hazardous weather outlook, Jul 14, 9:20 AM EDT, 3 hours 27 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE JACKSONVILLE FL
920 AM EDT SAT JUL 14 2007

FLZ020>025-030>033-035>038-040-GAZ132>136-149>154-162>166-151000-
ALACHUA-APPLING-ATKINSON-BACON-BAKER-BRADFORD-BRANTLEY-
CAMDEN (COASTAL)-CAMDEN (INLAND)-CHARLTON-CLAY-CLINCH-COFFEE-
COLUMBIA-DUVAL-ECHOLS-FLAGLER-GILCHRIST-GLYNN (COASTAL)-
GLYNN (INLAND)-HAMILTON-JEFF DAVIS-MARION-NASSAU-PIERCE-PUTNAM-
ST JOHNS-SUWANNEE-UNION-WARE-WAYNE-
920 AM EDT SAT JUL 14 2007

THIS OUTLOOK IS FOR NORTHEAST FLORIDA AND SOUTHEAST GEORGIA.

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

...ISOLATED STRONG TO SEVERE THUNDERSTORMS POSSIBLE THIS AFTERNOON...

NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED TODAY DUE TO
A VERY MOIST UNSTABLE AIRMASS COMBINED WITH AN UPPER LEVEL
DISTURBANCE. THIS AFTERNOON LOCALLY HEAVY RAINFALL AND FREQUENT
LIGHTNING STRIKES WILL OCCUR AS THE STORMS MOVE EAST NORTHEAST AT 10
TO 15 MPH. THE STRONGER STORMS MAY ALSO PRODUCE STRONG AND POSSIBLY
DAMAGING WINDS AS WELL AS HAIL.

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

NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED AGAIN SUNDAY
AFTERNOON AND EVENING. THE STRONGEST THUNDERSTORMS WILL BE CAPABLE
OF PRODUCING HAIL...STRONG WINDS...HEAVY RAINFALL...AND FREQUENT
CLOUD-TO-GROUND LIGHTNING STRIKES. SHOWERS AND THUNDERSTORMS WILL
BECOME MORE SCATTERED MONDAY THROUGH FRIDAY.

HEAT INDICES WILL BE IN THE 100 TO 105 DEGREE RANGE EACH AFTERNOON
NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE REQUESTED TO SELF-ACTIVATE IF WARNINGS ARE ISSUED FOR
THEIR AREA TODAY.

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

MZ/CARROLL

In the hours before

Special weather statement, Jul 14, 11:04 AM EDT, 1 hour 43 minutes before

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Special weather statement, Jul 14, 11:19 AM EDT, 1 hour 28 minutes before

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Special weather statement, Jul 14, 11:25 AM EDT, 1 hour 22 minutes before

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Special weather statement, Jul 14, 11:57 AM EDT, 50 minutes before

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Special weather statement, Jul 14, 12:27 PM EDT, 20 minutes before

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Special weather statement, Jul 14, 12:31 PM EDT, 16 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 14, 11:20 AM EDT	Special Marine Warning	JAX		55 min
Jul 14, 11:30 AM EDT	Severe Thunderstorm Warning	JAX	Marion	45 min
Jul 14, 12:12 PM EDT	Special Marine Warning	JAX		93 min
Jul 14, 1:17 PM EDT	Special Marine Warning	JAX		88 min
Jul 14, 1:53 PM EDT	Special Marine Warning	JAX		97 min
Jul 14, 1:53 PM EDT	Severe Thunderstorm Warning	JAX	Nassau	37 min
Jul 14, 1:59 PM EDT	Severe Thunderstorm Warning	JAX	Duval	37 min
Jul 14, 2:43 PM EDT	Special Marine Warning	JAX		82 min
Jul 14, 6:11 PM EDT	Severe Thunderstorm Warning	JAX	Alachua	49 min
Jul 14, 3:29 PM EDT	Severe Thunderstorm Warning	JAX	Echols	46 min

Nearby

Severe Thunderstorm Warnings in Florida, 2007 Every severe thunderstorm warning in 2007

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.