Alert archive / Georgia / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 236, NWS Jacksonville, FL

September 17, 2004Echols County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Sep 17, 2004, 3:23 AM EDT for Echols County, Georgia. It was in force for 37 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
Sep 17, 2004, 3:23 AM EDT (07:23 UTC)
Expired
Sep 17, 2004, 4:00 AM EDT
In force
37 min
Issued by
NWS Jacksonville, FL
Area
Counties, with a storm outline in the text

County Echols County, GA

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 7.4 hours before the alert went out and 117 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 00:00Z on 2004-09-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2714 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2004-09-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 116 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
2714 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
741 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
116 m²/s²
0-3 km storm-relative helicity
147 m²/s²
Significant tornado parameter
1.1
Supercell composite
6.9

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 Sep 16, 9:04 PM EDT, 6 hours 19 minutes earlier.

Area forecast discussion, Sep 16, 9:04 PM EDT, 6 hours 19 minutes before
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE JACKSONVILLE FL
904 PM EDT THU SEP 16 2004

.SHORT TERM...CONVERGENCE ZONE OVER THE FLORIDA PENINSULA SET OFF A
FEW SHOWERS/TSTMS THAT MOVED ALONG THE I-95 CORRIDOR WITH SOME
GUSTY WINDS THAT ARE MIXING DOWN FROM THE STRONGER WINDS ALOFT. WE
ARE STILL WATCHING A VERY PERSISTENT BAND OF SHOWERS AND EMBEDDED
TSTMS EXTENDING FM MACON TO TALLAHASSEE THAT HAS FINALLY STARTED TO
MAKE A MOVE TO THE EAST OVER THE PAST FEW HOURS...WE COULD SEE
STRONG GUSTY WINDS AND AN ISOLATED TORNADO STILL NOT OUT OF THE
QUESTION THROUGH MIDNIGHT AS THIS BAND MOVES INTO INLD SE GA AND
THE SUWANNEE RIVER VALLEY IN NE FL. AFTER MIDNIGHT THE BAND SHOULD
WEAKEN AS IT PUSHES ACROSS THE REMAINDER OF THE CWA...POPS ON THE
PAST ZFP RANGING FROM 30-50% SHOULD STILL WORK FOR TONIGHT...WILL
ADD A MENTION OF GUSTY WINDS WITH STORMS OVERNIGHT. MIN TEMPS WILL
HOLD IN THE MID/UPPER 70S AGAIN OVERNIGHT WITH ATMOSPHERE REMAINING
COUPLED. FOR FRIDAY...SCATTERED SHOWERS AND TSTMS SHOULD CONTINUE
UNTIL DRIER AIR WRAPPING AROUND THE SOUTHERN SIDE OF IVAN PUSHES
INTO THE CWA FRIDAY NIGHT. MAX TEMPS REACHING THE UPPER 80S ARND 90
IN SWLY FLOW...GUSTY WINDS IN SHOWER ACTIVITY WILL CONTINUE.
&&

.MARINE...00Z BUOY REPORTS AT 41008/41012 AND SABSOON TOWER NETWORK
ARE SUPPORTING SMALL CRAFT CONDITIONS WITH S/SELY WINDS AT 20 KNOTS
WITH GUSTS TO 30 KNOTS IN SHOWER ACTIVITY...WITH SEAS RUNNING 5 TO 6
FEET. 18Z MODEL SUITE SUPPORTS THIS AND WILL KEEP HEADLINES UP INTO
FRIDAY...WINDS WILL VEER SLOWLY TO THE SOUTH BY MORNING AND SWLY
DURING THE DAY ON FRIDAY WITH MAYBE A SUDDLE 3-5 DECREASE IN WIND
SPEED ON FRIDAY...SEAS WILL FALL SLOWLY AS WELL WITH FLOW BECOMING
MORE OFFSHORE.
&&

.PRELIMINARY POINT TEMPS/POPS...
AMG 74 87 68 89 / 50 40 20 10
SSI 77 87 73 87 / 50 40 20 10
JAX 75 90 71 91 / 50 40 20 10
SGJ 77 88 74 88 / 40 40 30 10
GNV 74 88 70 89 / 40 40 20 10
OCF 74 88 70 89 / 40 40 20 10
&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...SCA FERNANDINA BEACH TO FLAGLER BEACH OUT TO 60 NM.
GA...SCA ATLAMAHA SOUND TO FERNANDINA BEACH OUT TO 60 NM.
&&

HESS/CARROLL
Hazardous weather outlook, Sep 16, 3:26 PM EDT, 11 hours 57 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE JACKSONVILLE FL
326 PM EDT THU SEP 16 2004

FLZ020>025-030>033-035>038-040-GAZ132>136-149>154-162>166-171000-
ALACHUA-APPLING-ATKINSON-BACON-BAKER-BRADFORD-BRANTLEY-CHARLTON-CLAY-
CLINCH-COASTAL CAMDEN-COASTAL GLYNN-COFFEE-COLUMBIA-DUVAL-ECHOLS-
FLAGLER-GILCHRIST-HAMILTON-INLAND CAMDEN-INLAND GLYNN-JEFF DAVIS-
MARION-NASSAU-PIERCE-PUTNAM-ST. JOHNS-SUWANNEE-UNION-WARE-WAYNE-
326 PM EDT THU SEP 16 2004

THIS OUTLOOK IS FOR NORTHEAST FLORIDA AND SOUTHEAST GEORGIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

...TORNADO WATCH IS CANCELED...
...SEVERAL RIVERS REMAIN ABOVE FLOOD STAGE...
...HIGH RISK OF RIP CURRENTS AT AREA BEACHES...

SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS THE AREA
THIS AFTERNOON AS NARROW OUTER RAINBANDS FROM IVAN APPROACH FROM THE
WEST. ISOLATED SEVERE STORMS ARE POSSIBLE...ESPECIALLY WEST OF U.S.
HIGHWAY 301.

BREEZY CONDITIONS CAN BE EXPECTED OVER MAINLY WESTERN SECTIONS OF
THE AREA THIS AFTERNOON.  WIND GUSTS OF 20 TO 25 MPH WILL OCCUR THROUGH
THE EARLY EVENING TONIGHT.

SOME AREA RIVERS REMAIN IN FLOOD. SEE THE LATEST RIVER FLOOD
WARNINGS AND STATEMENTS FOR MORE INFORMATION.

AN INCREASING ONSHORE FLOW AND BUILDING SEAS WILL LEAD TO A HIGH
RISK OF RIP CURRENTS AT AREA BEACHES TODAY. PLEASE REFER TO THE SURF
ZONE FORECAST FOR MORE INFORMATION.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

...AREA RIVERS WILL CONTINUE AT OR ABOVE FLOOD STAGE...
...LOCALLY HEAVY RAINFALL POSSIBLE FRIDAY...

ADDITIONAL RIVERS WILL REACH FLOOD STAGE OVER THE NEXT FEW DAYS.
SEE THE LATEST RIVER FLOOD WARNINGS FOR MORE INFORMATION.

BANDS OF SHOWERS AND THUNDERSTORMS ASSOCIATED WITH IVAN WILL AFFECT
THE AREA AGAIN ON FRIDAY. LOCALLY HEAVY RAINFALL IS POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE REQUESTED TO SELF-ACTIVATE IF SEVERE WEATHER
APPROACHES.  LAW ENFORCEMENT AGENCIES...EMERGENCY MANAGEMENT
OFFICIALS...STORM SPOTTER GROUPS...AND OTHER INTERESTED CONCERNS
SHOULD MONITOR THE WEATHER SITUATION THIS AFTERNOON. PLEASE RELAY ANY
REPORTS OF DAMAGE OR FLOODING TO THE NATIONAL WEATHER SERVICE AND
LOCAL COUNTY EMERGENCY MANAGEMENT.

FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE IN
JACKSONVILLE WEBSITE ON THE INTERNET AT WWW.SRH.NOAA.GOV/JAX.

MZ/CAMP

In the hours before

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Special weather statement, Sep 17, 1:27 AM EDT, 1 hour 56 minutes before
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Special weather statement, Sep 17, 2:13 AM EDT, 1 hour 10 minutes before
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Special weather statement, Sep 17, 3:09 AM EDT, 14 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Sep 16, 11:10 PM EDTTornado WarningJAXCoffee35 min
Sep 17, 12:20 AM EDTSevere Thunderstorm WarningJAXEchols25 min
Sep 17, 12:28 AM EDTTornado WarningJAXEchols32 min
Sep 17, 2:36 AM EDTSevere Thunderstorm WarningJAXAtkinson, Ware39 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2004Every severe thunderstorm warning 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.