Alert archive / Florida / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 73, NWS Jacksonville, FL

April 7, 2005Hamilton County, Suwannee County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 7, 2005, 11:12 AM EDT for Hamilton County, Suwannee County, Florida. It was in force for 48 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: Apr 7, 2005, 11:12 AM EDT (15:12 UTC)
Expired: Apr 7, 2005, 12:00 PM EDT
In force: 48 min
Issued by: NWS Jacksonville, FL
Area: Counties, with a storm outline in the text

Counties Hamilton County, FL, Suwannee County, FL

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 3.2 hours before the alert went out and 123 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: 39 J/kg
Mixed-layer CIN: -222 J/kg
Mixed-layer LCL: 727 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 161 m²/s²
0-3 km storm-relative helicity: 177 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 Apr 7, 9:43 AM EDT, 1 hour 29 minutes earlier.

Area forecast discussion, Apr 7, 9:43 AM EDT, 1 hour 29 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
943 AM EDT THU APR 7 2005

...STRONG TO SEVERE STORMS POSSIBLE FOR NE FL THIS AFTERNOON...
LOCALLY HEAVY RAINFALL AREA WIDE...

SOLID BAND OF SHOWERS AND THUNDERSTORMS OVER WESTERN SE GA COUNTIES
EXTENDING INTO BIG BEND AND EASTERN GULF. STRONGEST ACTIVITY IS OVER
THE GULF WITH GOOD DIFFLUENT WEDGE SHAPE NOTED ON IR SATELLITE.
ACTIVITY OVER LAND BELOW SEVERE LEVELS BUT STILL PRODUCING HEAVY
RAINFALL. MAIN THREAT FOR SE GA WILL BE HEAVY RAINFALL.  FOR NE FL
THERE WILL BE A CHANCE OF STRONG WINDS/HAIL WITH LINE OF
THUNDERSTORMS AND ISOLATED TORNADOES ARE POSSIBLE. BETTER HEATING
AND DESTABILIZATION SHOULD OCCUR OVER NE FL AS PRECIP WILL NOT START
UNTIL THIS AFTERNOON. HOWEVER ONE NEGATIVE IS A THICK CIRRUS SHIELD
WHICH EXTENDS AHEAD OF LINE WHICH COULD LESSEN THREAT A BIT. WILL UP
POPS TO CATEGORICAL FOR ALL AREAS THIS AFTERNOON.

MARINE...SOUTH WINDS AROUND 15 KNOTS HAS BEEN SLOW TO INCREASE BUT
SHOULD THIS AFTERNOON AS LINE OF STORMS APPROACH FROM THE WEST.
SEAS HAVE COME UP TO 4-6 FOOT RANGE.  WILL EXPAND SCA TO INCLUDE
NEAR SHORE WATERS.

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...LAKE WIND ADVISORY IN EFFECT FROM 10 AM UNTIL 8 PM EDT THURSDAY
      FOR THE FOLLOWING ZONES...ALACHUA...BAKER...BRADFORD...
      CLAY...DUVAL...FLAGLER...MARION...NASSAU...PUTNAM...ST.
      JOHNS...AND UNION.
      FLOOD WATCH IN EFFECT UNTIL 8 PM EDT THURSDAY FOR THE
      FOLLOWING ZONES...COLUMBIA...GILCHRIST...HAMILTON...AND
      SUWANNEE.
GA...FLOOD WATCH IN EFFECT UNTIL 8 PM EDT THURSDAY FOR THE
      FOLLOWING ZONES...APPLING...ATKINSON...BACON...CLINCH...
      COFFEE...ECHOLS...JEFF DAVIS...AND WARE.
      LAKE WIND ADVISORY IN EFFECT FROM 10 AM UNTIL 8 PM EDT THURSDAY
      FOR THE FOLLOWING ZONES...BRANTLEY...CHARLTON...COASTAL
      CAMDEN...COASTAL GLYNN...INLAND CAMDEN...INLAND GLYNN...
      PIERCE...AND WAYNE.
AM...SMALL CRAFT ADVISORY IN EFFECT FOR THE FOLLOWING ZONES...
      ALTAMAHA SOUND GA TO FLAGLER BEACH FL OUT TO 60 NM OFFSHORE.

&&

MZ/AS

Hazardous weather outlook, Apr 7, 6:00 AM EDT, 5 hours 12 minutes before

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In the hours before

Special weather statement, Apr 7, 11:01 AM EDT, 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
1101 AM EDT THU APR 7 2005

FLZ020-021-071545-
HAMILTON FL-SUWANNEE FL-
1101 AM EDT THU APR 7 2005

...A SIGNIFICANT WEATHER ALERT HAS BEEN ISSUED FOR SUWANNEE AND
HAMILTON COUNTIES FOR STRONG THUNDERSTORM WINDS AND HAIL VALID UNTIL
1145 AM EDT...

AT 1101 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
CLUSTER OF STRONG THUNDERSTORMS CENTERED ALONG A LINE EXTENDING FROM
10 MILES NORTHWEST OF SUWANNEE RIVER STATE PARK TO 10 MILES SOUTHWEST
OF NEWBURN...OR ALONG A LINE EXTENDING FROM 7 MILES EAST OF MADISON
TO 7 MILES NORTHWEST OF MAYO...MOVING NORTHEAST AT 45 MPH. THIS
CLUSTER OF STRONG THUNDERSTORMS WILL ALSO AFFECT AREAS AROUND
SUWANNEE RIVER STATE PARK...NEWBURN...CROSSROADS...JENNINGS...LIVE
OAK...SUWANNEE SPRINGS AND JASPER THROUGH 1145 AM EDT. HAIL UP TO ONE
HALF INCH IN DIAMETER...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...OR YOU CAN CALL THE NATIONAL WEATHER SERVICE
IN JACKSONVILLE DIRECTLY AT 1-800-499-1594.

CAMP

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 7, 3:45 PM EDT	Severe Thunderstorm Warning	JAX	Marion	45 min
Apr 7, 3:53 PM EDT	Tornado Warning	JAX	Marion	37 min
Apr 7, 3:56 PM EDT	Severe Thunderstorm Warning	JAX	Putnam	49 min
Apr 7, 4:14 PM EDT	Tornado Warning	JAX	Putnam	46 min
Apr 7, 4:43 PM EDT	Special Marine Warning	JAX		92 min
Apr 7, 4:45 PM EDT	Severe Thunderstorm Warning	JAX	Flagler	32 min
Apr 7, 6:21 PM EDT	Special Marine Warning	JAX		39 min

Nearby

Severe Thunderstorm Warnings in Florida, 2005 Every severe thunderstorm warning in 2005

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.