Alert archive / Georgia / Tornado Watches in 2004

Tornado Watch 841

September 26, 200414 counties in Florida; 23 counties in Georgia

The Storm Prediction Center issued this tornado watch at Sep 26, 2004, 4:25 PM EDT for 14 counties in Florida; 23 counties in Georgia. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued
Sep 26, 2004, 4:25 PM EDT (20:25 UTC)
Expired
Sep 27, 2004, 1:00 AM EDT
In force
9 hr
Issued by
the Storm Prediction Center
All 37 counties

Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Hamilton County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Suwannee County, FL, Union County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Ben Hill County, GA, Brantley County, GA, Bryan County, GA, Camden County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Coffee County, GA, Echols County, GA, Glynn County, GA, Jeff Davis County, GA, Lanier County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Pierce County, GA, Tattnall County, GA, Telfair County, GA, Ware County, GA, Wayne County, GA

The radar

The Jacksonville radar (KJAX), 57 km from the middle of the area, began a volume at 20:27 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.

Warnings issued inside it

17 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Sep 26, 4:46 PM EDTTornado WarningJAXNassau14 min
Sep 26, 4:59 PM EDTTornado WarningJAXNassau16 min
Sep 26, 5:07 PM EDTTornado WarningJAXDuval, Saint Johns38 min
Sep 26, 6:59 PM EDTTornado WarningJAXSaint Johns31 min
Sep 26, 7:12 PM EDTTornado WarningJAXDuval18 min
Sep 26, 7:22 PM EDTTornado WarningJAXDuval, Saint Johns23 min
Sep 26, 7:54 PM EDTTornado WarningJAXDuval, Nassau, Saint Johns51 min
Sep 26, 8:42 PM EDTTornado WarningJAXNassau33 min
Sep 26, 9:42 PM EDTTornado WarningJAXNassau33 min
Sep 26, 9:55 PM EDTTornado WarningJAXCharlton35 min
Sep 26, 10:13 PM EDTTornado WarningJAXNassau32 min
Sep 26, 10:57 PM EDTTornado WarningJAXClinch33 min
Sep 26, 11:08 PM EDTTornado WarningCHSChatham37 min
Sep 26, 11:21 PM EDTTornado WarningJAXWare24 min
Sep 26, 11:48 PM EDTTornado WarningJAXAtkinson, Clinch27 min
Sep 27, 12:02 AM EDTTornado WarningJAXWare28 min
Sep 27, 12:48 AM EDTTornado WarningJAXClinch27 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 8.4 hours before the alert went out and 56 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-pSkew-T log-p diagram, Jacksonville, FL at 12:00Z on 2004-09-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1022 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 12:00Z on 2004-09-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 245 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1022 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
577 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
245 m²/s²
0-3 km storm-relative helicity
287 m²/s²
Significant tornado parameter
1.0
Supercell composite
6.4

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 262028
SEL1  
SPC WW 262025
FLZ000-GAZ000-CWZ000-270500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 841
NWS STORM PREDICTION CENTER NORMAN OK
425 PM EDT SUN SEP 26 2004

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       NORTHERN FLORIDA
       SOUTH-CENTRAL AND SOUTHEASTERN GEORGIA
       COASTAL WATERS

EFFECTIVE THIS SUNDAY AFTERNOON AND MONDAY MORNING FROM 425 PM
UNTIL 100 AM EDT.

TORNADOES...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS
LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 70 STATUTE MILES EAST AND WEST
OF A LINE FROM 25 MILES SOUTHEAST OF GAINESVILLE FLORIDA TO 60
MILES NORTH NORTHEAST OF WAYCROSS GEORGIA.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 840. WATCH NUMBER 840 WILL NOT BE IN EFFECT AFTER 425
PM EDT. 

DISCUSSION...FAVORABLE BOUNDARY LAYER SHEAR ENVELOPE AND OUTER BAND
CONVECTION ASSOCIATED WITH NERN QUADRANT OF TC JEANNE IS EXPECTED TO
SHIFT NWD ACROSS WW AREA THROUGH REMAINDER EVENING...LIKEWISE
SHIFTING POTENTIAL FOR MINI-SUPERCELLS AND ASSOCIATED TORNADOES.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH EXTREME
TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI
WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION VECTOR 14035.


...EDWARDS/HART

292,0830 320,0831 320,0804 292,0804

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 25, 8:48 PM EDTMesoscale DiscussionSPCBrevard, Flagler, Glades, Hendry, Highlands, Indian River and 10 more117 min
Sep 25, 11:10 PM EDTTornado WatchSPCBrevard, Flagler, Glades, Hardee, Hendry, Highlands and 14 more7 hr
Sep 26, 2:37 AM EDTMesoscale DiscussionSPCBrevard, Flagler, Highlands, Indian River, Lake, Marion and 6 more113 min
Sep 26, 4:50 AM EDTTornado WatchSPCAlachua, Baker, Bradford, Brevard, Citrus, Clay and 22 more12 hr
Sep 26, 8:21 AM EDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Brevard, Citrus, Clay and 18 more114 min
Sep 26, 11:13 AM EDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Brevard, Citrus, Clay and 22 more2 hr
Sep 26, 3:11 PM EDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Brevard, Citrus, Clay and 22 more2 hr
Sep 26, 7:16 PM EDTMesoscale DiscussionSPCBaker, Duval, Nassau119 min

Nearby

Tornado Watches in Georgia, 2004Tornado Watches in Florida, 2004Every tornado watch in 2004

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.