Alert archive / Florida / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 221, NWS Jacksonville, FL

July 12, 2015Clay County, Duval County, Saint Johns County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jul 12, 2015, 5:17 PM EDT for Clay County, Duval County, Saint Johns County, Florida. It was in force for 28 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, 2015, 5:17 PM EDT (21:17 UTC)
Expired: Jul 12, 2015, 5:45 PM EDT
In force: 28 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

Counties Clay County, FL, Duval County, FL, Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 46 km from the middle of the area, began a volume at 21:19 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 9.3 hours before the alert went out and 210 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: 642 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 953 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 164 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.7

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, 3:55 PM EDT, 1 hour 22 minutes earlier.

Area forecast discussion, Jul 12, 3:55 PM EDT, 1 hour 22 minutes before

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Hazardous weather outlook, Jul 12, 3:05 PM EDT, 2 hours 12 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE JACKSONVILLE FL
305 PM EDT SUN JUL 12 2015

AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-124-125-
GAZ132>136-149>154-162>166-130845-
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-
305 PM EDT SUN JUL 12 2015

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

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

MAX TEMPS WILL REACH THE MID TO UPPER 90S ACROSS INLAND AREAS WITH
HEAT INDICES OF 103-107 DEGREES THIS AFTERNOON.

SCATTERED AFTERNOON THUNDERSTORMS WILL DEVELOP WITH ISOLATED STRONG
TO SEVERE STORMS POSSIBLE. HIGHEST CHANCES WILL BE ACROSS NORTHEAST
FLORIDA...SOUTH OF A ST. AUGUSTINE TO GAINESVILLE LINE. STRONG GUSTY
WINDS...LOCALLY HEAVY RAINFALL...AND FREQUENT LIGHTNING WILL BE THE
PRIMARY THREATS.

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

HIGHS IN THE MID TO UPPER 90S WILL CONTINUE ON MONDAY AND TUESDAY WITH
HEAT INDEX VALUES AROUND 105 DEGREES.

SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE EXPECTED EACH
DAY WITH THE BEST CHANCES ACROSS INLAND AREAS. INTENSITY OF STORMS
WILL INCREASE THROUGH MID WEEK WITH ISOLATED TO SCATTERED STRONG/SEVERE
STORMS POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

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, 4:13 PM EDT, 1 hour 4 minutes before

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Special weather statement, Jul 12, 4:15 PM EDT, 1 hour 2 minutes before

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Special weather statement, Jul 12, 4:39 PM EDT, 38 minutes before

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Special weather statement, Jul 12, 4:55 PM EDT, 22 minutes before

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Special weather statement, Jul 12, 5:13 PM EDT, 4 minutes before

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Special weather statement, Jul 12, 5:14 PM EDT, 3 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 12, 2:06 PM EDT	Special Weather Statement	JAX	Marion	39 min
Jul 12, 2:17 PM EDT	Special Weather Statement	JAX	Citrus	28 min
Jul 12, 2:21 PM EDT	Areal Flood Advisory	JAX	Marion	84 min
Jul 12, 2:38 PM EDT	Special Weather Statement	JAX	Flagler	37 min
Jul 12, 2:46 PM EDT	Special Weather Statement	JAX	Marion	29 min
Jul 12, 3:15 PM EDT	Special Weather Statement	JAX	Putnam	30 min
Jul 12, 3:27 PM EDT	Severe Thunderstorm Warning	JAX	Marion, Putnam	33 min
Jul 12, 3:57 PM EDT	Special Weather Statement	JAX	Marion	18 min
Jul 12, 4:13 PM EDT	Special Weather Statement	JAX	Putnam	47 min
Jul 12, 4:15 PM EDT	Special Weather Statement	JAX	Duval	30 min
Jul 12, 4:20 PM EDT	Areal Flood Advisory	JAX	Marion	85 min
Jul 12, 4:39 PM EDT	Special Weather Statement	JAX	Duval	51 min
Jul 12, 4:55 PM EDT	Special Weather Statement	JAX	Putnam	50 min
Jul 12, 5:13 PM EDT	Special Weather Statement	JAX	Clay	32 min
Jul 12, 5:14 PM EDT	Special Weather Statement	JAX	Duval	31 min
Jul 12, 5:42 PM EDT	Special Weather Statement	JAX	Saint Johns	33 min
Jul 12, 6:00 PM EDT	Severe Thunderstorm Warning	JAX	Saint Johns	32 min
Jul 12, 7:25 PM EDT	Special Marine Warning	JAX		95 min
Jul 12, 7:28 PM EDT	Severe Thunderstorm Warning	JAX	Nassau	47 min
Jul 11, 8:30 PM EDT	Special Weather Statement	JAX	Brantley	30 min
Jul 11, 9:57 PM EDT	Special Weather Statement	JAX	Appling	33 min
Jul 12, 5:50 PM EDT	Special Weather Statement	JAX	Glynn	40 min
Jul 12, 6:17 PM EDT	Special Weather Statement	JAX	Charlton	43 min
Jul 12, 6:43 PM EDT	Special Weather Statement	JAX	Glynn	47 min
Jul 12, 6:44 PM EDT	Special Weather Statement	JAX	Charlton	46 min
Jul 12, 7:08 PM EDT	Special Weather Statement	JAX	Camden	52 min
Jul 12, 7:18 PM EDT	Special Weather Statement	JAX	Charlton	42 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.