Alert archive / Florida / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 274, NWS Jacksonville, FL

August 13, 2015Marion County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 13, 2015, 2:08 PM EDT for Marion County, Florida. It was in force for 37 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: Aug 13, 2015, 2:08 PM EDT (18:08 UTC)
Expired: Aug 13, 2015, 2:45 PM EDT
In force: 37 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

County Marion County, FL

The radar

The Jacksonville radar (KJAX), 146 km from the middle of the area, began a volume at 18:09 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

Tampa Bay, FL (KTBW), launched 12:00Z, 6.1 hours before the alert went out and 171 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: 1355 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 949 m above ground
0-6 km bulk shear: 0 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 0 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 Aug 13, 10:43 AM EDT, 3 hours 25 minutes earlier.

Area forecast discussion, Aug 13, 10:43 AM EDT, 3 hours 25 minutes before

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Hazardous weather outlook, Aug 13, 3:30 AM EDT, 10 hours 38 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
330 AM EDT THU AUG 13 2015

AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-124-125-
GAZ132>136-149>154-162>166-140930-
COASTAL WATERS FROM ALTAMAHA SOUND TO FERNANDINA BEACH FL OUT
20 NM-
COASTAL WATERS FROM FERNANDINA BEACH TO ST. AUGUSTINE FL OUT
20 NM-
COASTAL WATERS FROM ST. AUGUSTINE TO FLAGLER BEACH FL OUT 20 NM-
WATERS FROM ALTAMAHA SOUND GA TO FERNANDINA BEACH FL FROM 20 TO
60 NM-
WATERS FROM FERNANDINA BEACH TO ST. AUGUSTINE FL FROM 20 TO 60 NM-
WATERS FROM ST. AUGUSTINE TO FLAGLER BEACH FL FROM 20 TO 60 NM-
HAMILTON-SUWANNEE-COLUMBIA-BAKER-INLAND NASSAU-INLAND DUVAL-UNION-
BRADFORD-CLAY-ST. JOHNS-GILCHRIST-ALACHUA-PUTNAM-FLAGLER-MARION-
COASTAL NASSAU-COASTAL DUVAL-COFFEE-JEFF DAVIS-BACON-APPLING-
WAYNE-ATKINSON-WARE-PIERCE-BRANTLEY-INLAND GLYNN-COASTAL GLYNN-
ECHOLS-CLINCH-CHARLTON-INLAND CAMDEN-COASTAL CAMDEN-
330 AM EDT THU AUG 13 2015

...NUMEROUS SHOWERS AND THUNDERSTORMS EXPECTED THIS AFTERNOON AND EARLY
EVENING ACROSS NORTH CENTRAL FLORIDA...

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

.DAY ONE...TODAY AND TONIGHT...
A COLD FRONT WILL SLOWLY MOVE SOUTH INTO NORTH CENTRAL FLORIDA THIS
AFTERNOON. NUMEROUS SHOWERS AND STORMS ARE EXPECTED THIS AFTERNOON
INTO THE EARLY EVENING MAINLY SOUTH OF A GAINESVILLE TO ST AUGUSTINE
LINE. SCATTERED SHOWERS WITH A FEW STORMS ARE EXPECTED ELSEWHERE.
STRONG THUNDERSTORMS ARE POSSIBLE...WITH STRONG AND GUSTY WINDS...
FREQUENT LIGHTNING STRIKES...AND LOCALLY HEAVY RAIN IN EXCESS OF
2 INCHES.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

THE FRONT WILL STALL SOUTH OF THE AREA BY THE END OF THE WEEK THEN
MOVE BACK INTO THE AREA OVER THE WEEKEND AS A WARM FRONT. NUMEROUS
AFTERNOON AND EARLY EVENING SHOWERS AND STORMS ARE EXPECTED AGAIN
MAINLY SOUTH OF A GAINESVILLE TO ST AUGUSTINE LINE WITH SCATTERED
SHOWERS AND ISOLATED STORMS ELSEWHERE. SCATTERED TO NUMEROUS MAINLY
AFTERNOON AND EARLY EVENING SHOWERS AND STORMS WILL RETURN AREA WIDE
OVER THE WEEKEND AND NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ASKED TO SELF-ACTIVE TODAY IF WARNINGS ARE ISSUED.

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

In the hours before

Special weather statement, Aug 13, 1:24 PM EDT, 44 minutes before

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Special weather statement, Aug 13, 1:27 PM EDT, 41 minutes before

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Special weather statement, Aug 13, 1:46 PM EDT, 22 minutes before

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Special weather statement, Aug 13, 2:02 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
Aug 13, 1:24 PM EDT	Special Weather Statement	JAX	Flagler	51 min
Aug 13, 1:27 PM EDT	Special Weather Statement	JAX	Flagler	48 min
Aug 13, 1:46 PM EDT	Special Weather Statement	JAX	Alachua	44 min
Aug 13, 1:48 PM EDT	Areal Flood Advisory	JAX	Flagler, Saint Johns	87 min
Aug 13, 1:58 PM EDT	Severe Thunderstorm Warning	JAX	Flagler, Putnam, Saint Johns	47 min
Aug 13, 2:02 PM EDT	Special Weather Statement	JAX	Marion	28 min
Aug 13, 2:14 PM EDT	Areal Flood Advisory	JAX	Marion	91 min
Aug 13, 2:25 PM EDT	Special Weather Statement	JAX	Duval	35 min
Aug 13, 2:47 PM EDT	Special Weather Statement	JAX	Marion	28 min
Aug 13, 2:52 PM EDT	Special Weather Statement	JAX	Alachua	23 min
Aug 13, 2:55 PM EDT	Special Weather Statement	JAX	Clay	35 min
Aug 13, 3:12 PM EDT	Special Weather Statement	JAX	Alachua	48 min
Aug 13, 3:15 PM EDT	Special Weather Statement	JAX	Marion	45 min
Aug 13, 3:17 PM EDT	Areal Flood Advisory	JAX	Marion	88 min
Aug 13, 3:22 PM EDT	Severe Thunderstorm Warning	JAX	Clay	23 min
Aug 13, 3:39 PM EDT	Areal Flood Advisory	JAX	Alachua	96 min
Aug 13, 3:41 PM EDT	Special Weather Statement	JAX	Clay	49 min
Aug 13, 3:47 PM EDT	Severe Thunderstorm Warning	JAX	Bradford, Clay	43 min
Aug 13, 3:52 PM EDT	Special Weather Statement	JAX	Marion	53 min
Aug 13, 4:09 PM EDT	Special Weather Statement	JAX	Bradford	36 min
Aug 13, 4:32 PM EDT	Special Weather Statement	JAX	Union	28 min
Aug 13, 4:56 PM EDT	Special Weather Statement	JAX	Suwannee	34 min
Aug 13, 5:00 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Columbia, Union	31 min
Aug 13, 5:26 PM EDT	Special Weather Statement	JAX	Suwannee	34 min
Aug 13, 6:25 PM EDT	Special Weather Statement	JAX	Hamilton	35 min
Aug 13, 4:39 PM EDT	Special Weather Statement	JAX	Ware	36 min
Aug 13, 5:57 PM EDT	Special Weather Statement	JAX	Clinch	33 min
Aug 13, 6:29 PM EDT	Special Weather Statement	JAX	Echols	31 min
Aug 13, 6:35 PM EDT	Special Weather Statement	JAX	Atkinson	25 min

Nearby

Severe Thunderstorm Warnings in Florida, 2015 Every severe thunderstorm warning in 2015

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.