Alert archive / Florida / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 42, NWS Jacksonville, FL

April 14, 2013Clay County, Marion County, Putnam County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 14, 2013, 5:41 PM EDT for Clay County, Marion County, Putnam County, Florida. It was in force for 49 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 14, 2013, 5:41 PM EDT (21:41 UTC)
Expired: Apr 14, 2013, 6:30 PM EDT
In force: 49 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

Counties Clay County, FL, Marion County, FL, Putnam County, FL

The radar

The Jacksonville radar (KJAX), 100 km from the middle of the area, began a volume at 21:45 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 14, 1:52 PM EDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 9.7 hours before the alert went out and 217 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: 846 J/kg
Mixed-layer CIN: -106 J/kg
Mixed-layer LCL: 757 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.1

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 14, 2:46 PM EDT, 2 hours 55 minutes earlier.

Area forecast discussion, Apr 14, 2:46 PM EDT, 2 hours 55 minutes before

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Hazardous weather outlook, Apr 14, 2:03 PM EDT, 3 hours 38 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
203 PM EDT SUN APR 14 2013

AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-
GAZ132>136-149>154-162>166-151815-
ALTAMAHA SOUND GA TO FERNANDINA BEACH FL OUT 20 NM-
FERNANDINA BEACH TO ST AUGUSTINE FL OUT 20 NM-
ST AUGUSTINE TO FLAGLER BEACH FL OUT 20 NM-
ALTAMAHA SOUND GA TO FERNANDINA BEACH FL 20 NM TO 60 NM OFFSHORE-
FERNANDINA BEACH TO ST AUGUSTINE FL 20 NM TO 60 NM OFFSHORE-
ST AUGUSTINE TO FLAGLER BEACH FL 20 NM TO 60 NM OFFSHORE-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-
203 PM EDT SUN APR 14 2013

...TORNADO WATCH IN EFFECT FOR NORTHEAST FLORIDA AND A PORTION OF
SOUTHEAST GEORGIA UNTIL 10 PM THIS EVENING...

...HEAVY RAINFALL AND ISOLATED STRONG THUNDERSTORMS EXPECTED THIS
AFTERNOON AND TONIGHT...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST FLORIDA...
SOUTHEAST GEORGIA AND THE ADJACENT COASTAL WATERS.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO DEVELOP THROUGH THE
REST OF THE AFTERNOON INTO THE LATE EVENING HOURS AS A WARM FRONT
LIFTS NORTH ACROSS THE REGION. DAMAGING WINDS AND LARGE HAIL ARE
THE PRIMARY CONCERN...BUT ISOLATED TORNADOES WILL BE POSSIBLE AS
STRONG LOW LEVEL JET MOVES INTO THE REGION. THUS A TORNADO WATCH
HAS BEEN ISSUED FOR NORTHEAST FLORIDA...THE SOUTHERN PORTION OF
SOUTHEAST GEORGIA AND THE ADJACENT NEAR SHORE WATERS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY...

ISOLATED TO SCATTERED THUNDERSTORMS WILL LINGER OVER THE REGION ON
MONDAY...MAINLY DURING THE AFTERNOON HOURS.

ISOLATED THUNDERSTORMS WILL BE POSSIBLE EACH AFTERNOON AND EVENING
FROM TUESDAY THROUGH THURSDAY.

ISOLATED THUNDERSTORM ACTIVITY WILL REMAIN POSSIBLE WITH THE NEXT
COLD FRONTAL PASSAGE LATE FRIDAY INTO SATURDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE REQUESTED TO SELF-ACTIVATE IF WARNINGS ARE ISSUED
THIS AFTERNOON AND TONIGHT...AND TO REPORT ANY SIGNIFICANT
FLOODING OR SEVERE WEATHER.

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

JCH/MKT

In the hours before

Special weather statement, Apr 14, 4:01 PM EDT, 1 hour 40 minutes before

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Special weather statement, Apr 14, 4:42 PM EDT, 59 minutes before

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Special weather statement, Apr 14, 5:17 PM EDT, 24 minutes before

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Special weather statement, Apr 14, 5:35 PM EDT, 6 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
Apr 14, 4:01 PM EDT	Special Weather Statement	JAX	Alachua	29 min
Apr 14, 4:42 PM EDT	Special Weather Statement	JAX	Alachua	33 min
Apr 14, 5:05 PM EDT	Special Marine Warning	JAX		55 min
Apr 14, 5:17 PM EDT	Special Weather Statement	JAX	Bradford	43 min
Apr 14, 5:35 PM EDT	Special Weather Statement	JAX	Clay	40 min
Apr 14, 6:01 PM EDT	Severe Thunderstorm Warning	JAX	Marion	44 min
Apr 14, 6:05 PM EDT	Special Marine Warning	JAX		115 min
Apr 14, 6:23 PM EDT	Special Weather Statement	JAX	Putnam, Saint Johns	52 min
Apr 14, 6:51 PM EDT	Special Weather Statement	JAX	Marion	39 min
Apr 14, 7:06 PM EDT	Special Weather Statement	JAX	Hamilton	39 min
Apr 14, 7:09 PM EDT	Special Weather Statement	JAX	Union	51 min
Apr 14, 7:16 PM EDT	Special Weather Statement	JAX	Saint Johns	44 min
Apr 14, 7:20 PM EDT	Severe Thunderstorm Warning	JAX	Columbia, Hamilton, Suwannee	40 min
Apr 14, 7:25 PM EDT	Severe Thunderstorm Warning	JAX	Flagler, Saint Johns	50 min
Apr 14, 7:55 PM EDT	Special Weather Statement	JAX	Marion	50 min
Apr 14, 7:57 PM EDT	Special Marine Warning	JAX		2 hr

Nearby

Severe Thunderstorm Warnings in Florida, 2013 Every severe thunderstorm warning in 2013

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.