Alert archive / Florida / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 100, NWS Jacksonville, FL

July 12, 2013Clay County, Saint Johns County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jul 12, 2013, 2:36 PM EDT for Clay County, Saint Johns County, Florida. It was in force for 39 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 12, 2013, 2:36 PM EDT (18:36 UTC)
Expired: Jul 12, 2013, 3:15 PM EDT
In force: 39 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

Counties Clay County, FL, Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 60 km from the middle of the area, began a volume at 18:38 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, 6.6 hours before the alert went out and 62 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: 840 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 727 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: -30 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 12, 9:16 AM EDT, 5 hours 20 minutes earlier.

Area forecast discussion, Jul 12, 9:16 AM EDT, 5 hours 20 minutes before

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Hazardous weather outlook, Jul 12, 3:33 AM EDT, 11 hours 3 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
333 AM EDT FRI JUL 12 2013

AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-
GAZ132>136-149>154-162>166-131000-
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-
333 AM EDT FRI JUL 12 2013

...NUMEROUS THUNDERSTORMS WITH LOCALLY HEAVY RAINFALL POSSIBLE THIS
AFTERNOON INTO THE EVENING...

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

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

NUMEROUS THUNDERSTORMS CAN BE EXPECTED THIS AFTERNOON INTO THE
EVENING. A FEW OF THE STORMS WILL BE CAPABLE OF PRODUCING GUSTY
WINDS. LOCALLY HEAVY RAINFALL WILL ALSO BE POSSIBLE.

RIVER FLOOD WARNINGS ARE IN EFFECT FOR PORTIONS OF SOUTHEAST GEORGIA
RIVERS. PLEASE REFER TO STATEMENTS AND RIVER FLOOD WARNINGS FOR MORE
INFORMATION.

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

NUMEROUS AFTERNOON AND EVENING THUNDERSTORMS CAN BE EXPECTED THROUGH
THE WEEKEND. SOME OF THE STORMS WILL BE CAPABLE OF PRODUCING GUSTY
WINDS AND LOCALLY HEAVY RAINFALL. THUNDERSTORM COVERAGE WILL DECREASE
NEXT WEEK.

ELEVATED RIVER LEVELS WILL PERSIST THROUGH EARLY NEXT WEEK ACROSS
SOUTHEAST GEORGIA. PLEASE REFER TO STATEMENTS AND RIVER FLOOD
WARNINGS FOR MORE INFORMATION.

.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.

In the hours before

Special weather statement, Jul 12, 12:49 PM EDT, 1 hour 47 minutes before

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Special weather statement, Jul 12, 12:57 PM EDT, 1 hour 39 minutes before

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Special weather statement, Jul 12, 1:28 PM EDT, 1 hour 8 minutes before

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Special weather statement, Jul 12, 2:12 PM EDT, 24 minutes before

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Special weather statement, Jul 12, 2:26 PM EDT, 10 minutes before

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Special weather statement, Jul 12, 2:28 PM EDT, 8 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 11, 9:28 PM EDT	River Flood Warning	JAX	Columbia, Gilchrist, Suwannee	22 days
Jul 12, 12:49 PM EDT	Special Weather Statement	JAX	Marion	41 min
Jul 12, 12:57 PM EDT	Special Weather Statement	JAX	Baker	33 min
Jul 12, 1:28 PM EDT	Special Weather Statement	JAX	Duval	47 min
Jul 12, 2:12 PM EDT	Special Weather Statement	JAX	Saint Johns	48 min
Jul 12, 2:26 PM EDT	Special Weather Statement	JAX	Saint Johns	34 min
Jul 12, 2:28 PM EDT	Special Weather Statement	JAX	Saint Johns	47 min
Jul 12, 2:44 PM EDT	Special Marine Warning	JAX		2 hr
Jul 12, 3:08 PM EDT	Areal Flood Advisory	JAX	Saint Johns	97 min
Jul 12, 4:03 PM EDT	Special Marine Warning	JAX		117 min
Jul 12, 4:38 PM EDT	Special Marine Warning	JAX		97 min
Jul 11, 9:23 PM EDT	River Flood Warning	JAX	Echols	5 days
Jul 12, 3:33 PM EDT	Special Weather Statement	JAX	Coffee	42 min
Jul 12, 4:21 PM EDT	Special Weather Statement	JAX	Atkinson, Coffee	39 min
Jul 12, 5:03 PM EDT	Severe Thunderstorm Warning	JAX	Atkinson, Coffee	42 min
Jul 12, 5:09 PM EDT	Special Weather Statement	JAX	Bacon	51 min
Jul 12, 5:27 PM EDT	Special Weather Statement	JAX	Atkinson	33 min
Jul 12, 6:00 PM EDT	Special Weather Statement	JAX	Atkinson, Bacon	45 min
Jul 12, 7:08 PM EDT	Special Weather Statement	JAX	Appling	52 min
Jul 12, 7:39 PM EDT	Areal Flood Advisory	JAX	Appling	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.