Alert archive / Florida / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 307, NWS Jacksonville, FL

August 26, 2015Saint Johns County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 26, 2015, 6:57 PM EDT for Saint Johns County, Florida. It was in force for 33 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 26, 2015, 6:57 PM EDT (22:57 UTC)
Expired: Aug 26, 2015, 7:30 PM EDT
In force: 33 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

County Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 70 km from the middle of the area, began a volume at 22:56 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, 11.0 hours before the alert went out and 183 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: 751 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 1157 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 7 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 26, 2:55 PM EDT, 4 hours 2 minutes earlier.

Area forecast discussion, Aug 26, 2:55 PM EDT, 4 hours 2 minutes before

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Hazardous weather outlook, Aug 26, 4:10 AM EDT, 14 hours 47 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
410 AM EDT WED AUG 26 2015

AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-124-125-
GAZ132>136-149>154-162>166-271100-
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-
410 AM EDT WED AUG 26 2015

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

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

ISOLATED TO SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE
EXPECTED ACROSS COASTAL SOUTHEAST GEORGIA AND NORTHEAST FLORIDA.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

SCATTERED TO NUMEROUS AFTERNOON AND EVENING THUNDERSTORMS ARE
POSSIBLE EACH DAY ACROSS NORTHEAST FLORIDA AND SOUTHEAST GEORGIA.
LOCALLY HEAVY RAINFALL WILL BE POSSIBLE WITH THESE STORMS.

THE FORECAST TRACK AND STRENGTH OF TROPICAL STORM ERIKA IS STILL
UNCERTAIN INTO EARLY NEXT WEEK. SWELLS ARE EXPECTED TO INCREASE IN
THE COASTAL WATERS INCREASING THE RIP CURRENT RISK LATE THIS WEEKEND
INTO NEXT WEEK.

.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, Aug 26, 4:59 PM EDT, 1 hour 58 minutes before

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Special weather statement, Aug 26, 5:18 PM EDT, 1 hour 39 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
518 PM EDT WED AUG 26 2015

FLZ033-125-262200-
COASTAL DUVAL FL-ST. JOHNS FL-
518 PM EDT WED AUG 26 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN DUVAL AND
NORTHWESTERN ST. JOHNS COUNTIES UNTIL 600 PM EDT...

AT 518 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
BAYARD...OR NEAR UNF...MOVING EAST AT 5 MPH.

EXCESSIVE CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH
CAN BE EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE.

LOCATIONS IMPACTED INCLUDE...
JACKSONVILLE...PONTE VEDRA BEACH...FRUIT COVE...BAYARD...DURBIN...
SWITZERLAND AND PALM VALLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...
REPORT DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY
EMERGENCY MANAGEMENT.

LAT...LON 2995 8151 3004 8169 3009 8168 3013 8162
      3012 8157 3012 8154 3010 8154 3011 8151
      3014 8154 3018 8156 3020 8156 3021 8157
      3024 8155 3025 8138 3024 8138
TIME...MOT...LOC 2118Z 262DEG 6KT 3019 8151

PETERSON

Local storm report, Aug 26, 5:26 PM EDT, 1 hour 31 minutes before

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Special weather statement, Aug 26, 6:01 PM EDT, 56 minutes before

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Special weather statement, Aug 26, 6:04 PM EDT, 53 minutes before

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Special weather statement, Aug 26, 6:48 PM EDT, 9 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 25, 9:16 PM EDT	Special Weather Statement	JAX	Nassau	44 min
Aug 25, 9:55 PM EDT	Areal Flood Advisory	JAX	Duval, Nassau	2 hr
Aug 25, 10:02 PM EDT	Special Weather Statement	JAX	Duval	43 min
Aug 25, 10:14 PM EDT	Special Marine Warning	JAX		91 min
Aug 25, 10:54 PM EDT	Special Weather Statement	JAX	Clay	51 min
Aug 25, 11:01 PM EDT	Special Marine Warning	JAX		59 min
Aug 26, 12:08 AM EDT	Special Marine Warning	JAX		67 min
Aug 26, 3:18 PM EDT	Special Weather Statement	JAX	Saint Johns	42 min
Aug 26, 4:26 PM EDT	Special Weather Statement	JAX	Duval	49 min
Aug 26, 4:59 PM EDT	Special Weather Statement	JAX	Nassau	46 min
Aug 26, 5:03 PM EDT	Severe Thunderstorm Warning	JAX	Nassau	27 min
Aug 26, 5:08 PM EDT	Special Marine Warning	JAX		112 min
Aug 26, 5:18 PM EDT	Special Weather Statement	JAX	Saint Johns	42 min
Aug 26, 5:29 PM EDT	Severe Thunderstorm Warning	JAX	Nassau	31 min
Aug 26, 5:35 PM EDT	Areal Flood Advisory	JAX	Nassau	85 min
Aug 26, 5:41 PM EDT	Areal Flood Advisory	JAX	Duval, Saint Johns	94 min
Aug 26, 6:01 PM EDT	Special Weather Statement	JAX	Saint Johns	44 min
Aug 26, 6:04 PM EDT	Special Weather Statement	JAX	Flagler	41 min
Aug 26, 6:21 PM EDT	Areal Flood Advisory	JAX	Saint Johns	84 min
Aug 26, 6:41 PM EDT	Areal Flood Advisory	JAX	Saint Johns	94 min
Aug 26, 6:48 PM EDT	Special Weather Statement	JAX	Saint Johns	42 min
Aug 26, 6:52 PM EDT	Special Marine Warning	JAX		113 min
Aug 26, 7:01 PM EDT	Special Weather Statement	JAX	Duval	44 min
Aug 26, 7:43 PM EDT	Special Weather Statement	JAX	Bradford	47 min
Aug 25, 10:58 PM EDT	Special Weather Statement	JAX	Charlton	47 min
Aug 25, 11:09 PM EDT	Special Weather Statement	JAX	Camden	36 min
Aug 25, 11:16 PM EDT	Areal Flood Advisory	JAX	Camden	89 min
Aug 25, 11:35 PM EDT	Areal Flood Advisory	JAX	Charlton	85 min
Aug 25, 11:49 PM EDT	Special Weather Statement	JAX	Camden	26 min
Aug 25, 11:58 PM EDT	Areal Flood Warning	JAX	Camden	2 hr
Aug 25, 11:59 PM EDT	Special Weather Statement	JAX	Camden	31 min
Aug 26, 12:10 AM EDT	Special Weather Statement	JAX	Camden	35 min
Aug 26, 3:24 PM EDT	Special Weather Statement	JAX	Camden	51 min
Aug 26, 4:54 PM EDT	Special Weather Statement	JAX	Camden	51 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.