Alert archive / Florida / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 55, NWS Jacksonville, FL

May 4, 2013Flagler County, Saint Johns County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at May 4, 2013, 9:36 PM EDT for Flagler County, Saint Johns County, Florida. It was in force for 84 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: May 4, 2013, 9:36 PM EDT (01:36 UTC)
Expired: May 4, 2013, 11:00 PM EDT
In force: 84 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

Counties Flagler County, FL, Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 94 km from the middle of the area, began a volume at 01:37 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 00:00Z, 1.6 hours before the alert went out and 96 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: 122 J/kg
Mixed-layer CIN: -111 J/kg
Mixed-layer LCL: 470 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 152 m²/s²
0-3 km storm-relative helicity: 403 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

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 May 4, 8:51 PM EDT, 45 minutes earlier.

Area forecast discussion, May 4, 8:51 PM EDT, 45 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
851 PM EDT SAT MAY 4 2013

.UPDATE...

HAVE UPDATED TO EXTEND THE LAKE WIND ADVISORY THROUGH
MIDNIGHT...AS WINDS ARE STILL GUSTING TO CRITERIA NEAR THE
COAST. DO NOT SEE THIS DECREASING UNTIL THE FRONT GETS CLOSE
ENOUGH TO WEAKEN THE GRADIENT.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  58  76  51  74 /  70  60  20  50
SSI  64  74  57  73 /  70  60  20  30
JAX  62  78  53  75 /  90  50  20  30
SGJ  64  75  59  73 /  80  20  20  20
GNV  60  78  52  75 /  40  20  20  30
OCF  62  79  54  76 /  30  20  20  20

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...LAKE WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR DUVAL-FLAGLER-
     NASSAU-ST JOHNS.

     HIGH RIP CURRENT RISK UNTIL 6 AM EDT SUNDAY FOR DUVAL-FLAGLER-
     NASSAU-ST JOHNS.

     HIGH SURF ADVISORY UNTIL 6 AM EDT SUNDAY FOR DUVAL-FLAGLER-
     NASSAU-ST JOHNS.

     COASTAL FLOOD ADVISORY UNTIL 9 AM EDT SUNDAY FOR DUVAL-FLAGLER-
     NASSAU-ST JOHNS.

     FLOOD WATCH UNTIL 6 AM EDT SUNDAY FOR BRADFORD-CLAY-DUVAL-ST
     JOHNS.

GA...LAKE WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR COASTAL CAMDEN-
     COASTAL GLYNN-INLAND CAMDEN-INLAND GLYNN.

     HIGH RIP CURRENT RISK UNTIL 6 AM EDT SUNDAY FOR COASTAL CAMDEN-
     COASTAL GLYNN.

     HIGH SURF ADVISORY UNTIL 6 AM EDT SUNDAY FOR COASTAL CAMDEN-
     COASTAL GLYNN.

     COASTAL FLOOD ADVISORY UNTIL 9 AM EDT SUNDAY FOR COASTAL CAMDEN-
     COASTAL GLYNN.

AM...SMALL CRAFT ADVISORY FROM 2 AM TO 2 PM EDT SUNDAY FOR 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.

     GALE WARNING UNTIL 2 AM EDT SUNDAY FOR 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.

     SMALL CRAFT ADVISORY UNTIL 6 AM EDT SUNDAY FOR 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.

&&

STRUBLE//

Hazardous weather outlook, May 4, 9:30 PM EDT, 6 minutes before

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In the hours before

Local storm report, May 4, 4:46 PM EDT, 4 hours 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
446 PM EDT SAT MAY 04 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0440 PM     COASTAL FLOOD    3 NNW MAYPORT           30.42N 81.43W
05/04/2013                   DUVAL              FL   NWS EMPLOYEE

            OFF DUTY NWS EMPLOYEE REPORTED THAT WATER WAS OVER THE
            DOCKS ON FORT GEORGE ISLAND.

&&

SCHASE

Special weather statement, May 4, 5:06 PM EDT, 4 hours 30 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
506 PM EDT SAT MAY 4 2013

GAZ136-152>154-042130-
BRANTLEY-COASTAL GLYNN-INLAND GLYNN-WAYNE-
506 PM EDT SAT MAY 4 2013

...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR SOUTHEASTERN
WAYNE...NORTHEASTERN BRANTLEY AND NORTHWESTERN GLYNN COUNTIES FOR
STRONG WINDS AND SMALL HAIL VALID UNTIL 530 PM EDT...

AT 507 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CENTERED OVER THALMANN...MOVING NORTHEAST AT 25
MPH. THIS STRONG THUNDERSTORM WILL ALSO AFFECT AREAS AROUND
THALMANN...MOUNT PLEASANT AND EVERETT THROUGH 530 PM EDT. HAIL UP TO
THREE QUARTER INCH IN DIAMETER AND GUSTY WINDS OF 45 TO 55 MPH CAN BE
EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE.

REPORT DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY
EMERGENCY MANAGEMENT.

LAT...LON 3119 8167 3130 8183 3150 8165 3148 8161
      3145 8162 3136 8152 3135 8149 3134 8149
TIME...MOT...LOC 2107Z 221DEG 21KT 3131 8168

PETERSON

Special weather statement, May 4, 7:48 PM EDT, 1 hour 48 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
748 PM EDT SAT MAY 4 2013

FLZ025-032-033-050030-
CLAY-DUVAL-ST. JOHNS-
748 PM EDT SAT MAY 4 2013

...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR EASTERN CLAY...
NORTHWESTERN ST. JOHNS AND SOUTHERN DUVAL COUNTIES FOR STRONG WINDS
AND EXCESSIVE LIGHTNING VALID UNTIL 830 PM EDT...

AT 749 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG
THUNDERSTORMS CENTERED ALONG A LINE EXTENDING FROM 4 MILES WEST OF
BAYMEADOWS TO 4 MILES SOUTHWEST OF SWITZERLAND...STATIONARY. THESE
STRONG THUNDERSTORMS WILL ALSO AFFECT AREAS AROUND BAYMEADOWS...
SWITZERLAND...MANDARIN...FRUIT COVE AND BAYARD THROUGH 830 PM EDT.
EXCESSIVE CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH
CAN BE EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE. HEAVY RAINFALL WILL
PRODUCE PONDING OF WATER ON ROADWAYS AND MINOR FLOODING OF LOW-LYING
AREAS.

REPORT DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY
EMERGENCY MANAGEMENT.

LAT...LON 3023 8143 2995 8157 3005 8172 3025 8163
TIME...MOT...LOC 2349Z 051DEG 0KT 3024 8163 3004 8170

ENYEDI

Local storm report, May 4, 8:16 PM EDT, 1 hour 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
816 PM EDT SAT MAY 04 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0800 PM     FLASH FLOOD      3 WSW ORTEGA            30.25N 81.75W
05/04/2013                   DUVAL              FL   PUBLIC

            MULTIPLE REPORTS OF WATER OVER ROADS 2-3 FEET DEEP IN
            SOME SPOTS WITH ADDITIONAL REPORTS OF SOME STRUCTURAL
            FLOODING. REPORTS ARE COMING FROM BETWEEN BAMBI LANE AND
            105TH STREET AND INTERSTATE 295 AND BLANDING BOULEVARD.

&&

SCHASE

Local storm report, May 4, 8:18 PM EDT, 1 hour 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
818 PM EDT SAT MAY 04 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0755 PM     FLOOD            4 WSW ARLINGTON         30.31N 81.66W
05/04/2013                   DUVAL              FL   PUBLIC

            PUBLIC REPORT OF WATER OVER THE ROAD BETWEEN SAN MARCO
            BOULEVARD AND LASALLE STREET.

&&

SCHASE

Local storm report, May 4, 8:53 PM EDT, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
853 PM EDT SAT MAY 04 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0823 PM     FLASH FLOOD      5 NW ORANGE PARK        30.22N 81.76W
05/04/2013                   DUVAL              FL   PUBLIC

            PUBLIC REPORT OF STRANDED VEHICLES BETWEEN OVERLAND PARK
            BOULEVARD AND BEAR CREEK ROAD.

0840 PM     FLASH FLOOD      4 NE LAKESIDE           30.17N 81.72W
05/04/2013                   CLAY               FL   EMERGENCY MNGR

            CLAY COUNTY EMERGENCY MANAGEMENT REPORTED SIGNIFICANT
            STREET FLOODING WITH IMPASSABLE ROADS AND STRANDED
            VEHICLES BETWEEN KINGSLEY AVENUE AND WELLS ROAD AND
            BLANDING BOULEVARD AND US-17.

&&

SCHASE

The office that day

Everything else NWS Jacksonville, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 4, 8:15 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Duval, Putnam, Saint Johns	90 min
May 4, 8:20 PM EDT	Areal Flood Warning	JAX	Clay, Duval, Putnam, Saint Johns	85 min
May 4, 8:25 PM EDT	Tornado Warning	JAX	Saint Johns	50 min
May 4, 8:57 PM EDT	Special Marine Warning	JAX		2 hr
May 4, 9:04 PM EDT	Flash Flood Warning	JAX	Saint Johns	3 hr
May 4, 9:16 PM EDT	Tornado Warning	JAX	Saint Johns	44 min
May 4, 9:43 PM EDT	Areal Flood Advisory	JAX	Flagler, Saint Johns	2 hr
May 4, 9:56 PM EDT	Special Weather Statement	JAX	Flagler	64 min
May 4, 10:44 PM EDT	Special Marine Warning	JAX		91 min
May 4, 11:20 PM EDT	Areal Flood Warning	JAX	Duval	3 hr
May 5, 4:44 AM EDT	Special Marine Warning	JAX		61 min
May 5, 9:09 AM EDT	Rip Current Statement	JAX	Flagler, Nassau	11 hr
May 5, 11:24 AM EDT	River Flood Warning	JAX	Baker, Nassau	39 hr
May 5, 11:37 AM EDT	Small Craft Advisory for Hazardous Seas	JAX		9 hr
May 5, 12:52 AM EDT	Special Weather Statement	JAX	Bacon	38 min
May 5, 3:28 AM EDT	Areal Flood Advisory	JAX	Camden, Glynn	92 min
May 5, 5:02 AM EDT	Areal Flood Advisory	JAX	Glynn	58 min

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.