Alert archive / Florida / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 21, NWS Jacksonville, FL

March 2, 2007Duval County, Nassau County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Mar 2, 2007, 5:24 AM EST for Duval County, Nassau County, Florida. It was in force for 51 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Mar 2, 2007, 5:24 AM EST (10:24 UTC)
Expired: Mar 2, 2007, 6:15 AM EST
In force: 51 min
Issued by: NWS Jacksonville, FL
Area: Counties, with a storm outline in the text

Counties Duval County, FL, Nassau County, FL

The radar

The Jacksonville radar (KJAX), 8 km from the middle of the area, began a volume at 10:26 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.

What was reported inside it

Time	Report	Where	Remark
Mar 2, 5:35 AM EST	TSTM WND DMG	3 Se Callahan, FL	NUMEROUS TREES AND POWERLINES DOWN ALONG CHURCH RD EAST OF U.S. 1

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 2, 12:54 AM EST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 10.4 hours before the alert went out and 7 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: 1205 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 693 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 330 m²/s²
0-3 km storm-relative helicity: 429 m²/s²
Significant tornado parameter: 3.0
Supercell composite: 12.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS52 KJAX 021024
SVRJAX
FLC031-089-021115-
/O.NEW.KJAX.SV.W.0021.070302T1024Z-070302T1115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
524 AM EST FRI MAR 2 2007

THE NATIONAL WEATHER SERVICE IN JACKSONVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NASSAU COUNTY IN NORTHEAST FLORIDA
  DUVAL COUNTY IN NORTHEAST FLORIDA

* UNTIL 615 AM EST

* AT 518 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM 8 MILES NORTH OF JACKSONVILLE
  INTERNATIONAL AIRPORT TO 7 MILES SOUTHWEST OF BRYCEVILLE...OR ALONG
  A LINE EXTENDING FROM 8 MILES NORTH OF JACKSONVILLE INTERNATIONAL
  AIRPORT TO 20 MILES SOUTHWEST OF CALLAHAN...AND MOVING EAST AT 35
  MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  YULEE...JACKSONVILLE INTERNATIONAL AIRPORT...NORMANDY...FERNANDINA
  BEACH...ORTEGA...RIVERSIDE...OCEANWAY...SAN MARCO...DOWNTOWN
  JACKSONVILLE...AMELIA CITY...ARLINGTON...FORT CAROLINE...SAN
  PABLO...TALBOT ISLAND...NEPTUNE BEACH...MAYPORT...LITTLE TALBOT
  ISLAND AND JACKSONVILLE BEACH.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY
OR YOUR COUNTY EMERGENCY MANAGEMENT...OR YOU CAN CALL THE NATIONAL
WEATHER SERVICE IN JACKSONVILLE DIRECTLY AT 800-499-1594 TO REPORT
SEVERE WEATHER.

LAT...LON 3028 8203 3037 8205 3073 8168 3070 8154
      3072 8148 3071 8142 3055 8144 3043 8140
      3041 8141 3029 8138

$$

HESS

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 2, 3:16 AM EST	Severe Thunderstorm Warning	JAX	Hamilton, Suwannee	44 min
Mar 2, 3:40 AM EST	Tornado Warning	JAX	Suwannee	35 min
Mar 2, 4:02 AM EST	Tornado Warning	JAX	Columbia, Hamilton	43 min
Mar 2, 4:22 AM EST	Severe Thunderstorm Warning	JAX	Baker	53 min
Mar 2, 4:45 AM EST	Special Marine Warning	JAX		90 min
Mar 2, 4:52 AM EST	Tornado Warning	JAX	Nassau	38 min
Mar 2, 5:26 AM EST	Special Marine Warning	JAX		94 min
Mar 2, 1:57 PM EST	Fire Weather Watch	JAX	Baker, Gilchrist, Suwannee, Union	14 hr
Mar 2, 1:57 PM EST	Fire Weather Watch	JAX	Baker, Bradford, Gilchrist, Nassau, Suwannee, Union	14 hr

Nearby

Severe Thunderstorm Warnings in Florida, 2007 Every severe thunderstorm warning in 2007

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.