Alert archive / Georgia / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 78, NWS Tallahassee, FL

June 25, 2010Irwin County, Georgia

NWS Tallahassee, FL issued this severe thunderstorm warning at Jun 25, 2010, 1:36 PM EDT for Irwin County, Georgia. It was in force for 39 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
Jun 25, 2010, 1:36 PM EDT (17:36 UTC)
Expired
Jun 25, 2010, 2:15 PM EDT
In force
39 min
Issued by
NWS Tallahassee, FL
Area
Storm-based polygon

County Irwin County, GA

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 5.6 hours before the alert went out and 228 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, Peachtre/Fal Fld, GA at 12:00Z on 2010-06-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1409 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, Peachtre/Fal Fld, GA at 12:00Z on 2010-06-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -49 square meters per square second.1939Sfc1 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
1409 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
1153 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
-49 m²/s²
0-3 km storm-relative helicity
-14 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 Tallahassee, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 25, 9:40 AM EDT, 3 hours 56 minutes earlier.

Area forecast discussion, Jun 25, 9:40 AM EDT, 3 hours 56 minutes before
AREA FORECAST DISCUSSION...RETRANSMITTED
NATIONAL WEATHER SERVICE TALLAHASSEE FL
940 AM EDT FRI JUN 25 2010

.UPDATE...RUC ANALYSIS CONTINUED TO SHOW MID AND LOW LEVEL RIDGING
OVER THE REGION. RADAR AND SATELLITE SHOWED A COUPLE OF SHOWERS AND
THUNDERSTORMS OVER THE COASTAL WATERS THIS MORNING WITH CLEAR TO
PARTLY CLOUDY SKIES OVER INLAND PORTIONS OF THE CWA. TEMPERATURES
ARE ON THE RISE ALREADY APPROACHING 80 IN MANY PLACES. EXPECT
CONDITIONS SIMILAR TO YESTERDAY WITH HIGHS IN THE UPPER 90S AND
LIGHT AND VARIABLE WINDS SHIFTING TO SOUTHERLY THIS AFTERNOON.
DAYTIME HIGHS COMBINED WITH DEWPOINTS AROUND 70 WILL CONTRIBUTE TO
HEAT INDICES OVER 100 FOR MUCH OF THE REGION. SCATTERED SHOWERS AND
THUNDERSTORMS WILL BE POSSIBLE AGAIN THIS AFTERNOON AND SHOULD BE A
BIT MORE WIDESPREAD THAN YESTERDAY AS THE SEABREEZE PUSHES INLAND
LATER THIS AFTERNOON.

UPDATED GRIDS TO REFLECT INCREASED SKIES AND POPS THIS AFTERNOON AND
TO BRING IN LATEST OBS FROM AROUND THE REGION. THE 12Z SOUNDING FROM
TLH SHOWED A DEEP MOIST LAYER FROM THE SURFACE TO 500 MB AND PWAT OF
1.77 INCHES. MID LEVELS HAVE MOISTENED UP CONSIDERABLY SINCE
YESTERDAY AND THIS SHOULD ALLOW FOR DEEPER AND MORE WIDESPREAD
CONVECTIVE DEVELOPMENT THIS AFTERNOON. IN ADDITION...LATEST WRF RUN
DEPICTED WIDESPREAD SHOWER AND THUNDERSTORM ACTIVITY IN A CORRIDOR
FROM NORTH OF APALACHICOLA INTO SOUTH-CENTRAL GEORGIA. SKIES WERE
ALSO INCREASED FOR THE AFTERNOON TO ACCOUNT FOR GREATER CONVECTIVE
COVERAGE.

&&

.MARINE...WITH THE RIDGE AXIS SITUATED ALONG THE NORTHERN GULF
COAST...LIGHT EASTERLY FLOW WILL CONTINUE INTO SATURDAY. BY
SUNDAY...WINDS WILL VEER TO THE SOUTHEAST AND INCREASE SLIGHTLY AS A
TROPICAL WAVE MOVES INTO THE SOUTHERN GULF OF MEXICO. THE ONSHORE
FLOW WILL CONTINUE INTO THE MIDDLE OF NEXT WEEK. AT THIS
TIME...WINDS ARE FORECAST TO REMAIN BELOW HEADLINE CRITERIA WITH
SEAS STAYING AT OR BELOW 4 FEET.

&&

.AVIATION...THROUGH 12Z SAT.
VFR CONDITIONS ARE EXPECTED FOR MUCH OF THE TAF CYCLE. THIS
AFTERNOON..EXPECT SCT SHRA/TSRA TO DEVELOP ALONG AND AHEAD OF THE
SEA BREEZE. TSRA MAY BRING GUSTY WINDS AND BRIEF MVFR/IFR VSBYS
THROUGH THE EARLY EVENING HOURS. ACTIVITY WILL DIMINISH BY TONIGHT
WITH POTENTIAL FOR FOG DEVELOPMENT THROUGH THE EARLY SATURDAY
MORNING. OVERALL IMPACT SHOULD BE MINOR WITH MVFR VSBYS AT SOME
TERMINALS. REMNANT FOG WILL BEGIN TO LIFT THROUGH SATURDAY MORNING.

&&

.FIRE WEATHER...RELATIVE HUMIDITY VALUES ONCE AGAIN TODAY ALONG THE
INTERSTATE 10 CORRIDOR ARE EXPECTED TO DROP INTO THE UPPER 30 TO 40
PERCENT RANGE...BUT REMAIN ABOVE CRITICAL VALUES. ONE MORE
RELATIVELY DRY RH DAY CAN BE EXPECTED FOR SATURDAY BEFORE MOISTURE
LEVELS INCREASE INTO NEXT WEEK. NO RED FLAG CONCERNS ARE EXPECTED
THROUGH THE FORECAST PERIOD.

&&

.PREV DISCUSSION...
317 AM EDT FRI JUN 25 2010

.SHORT TERM (TODAY THROUGH SUNDAY)...DEEP LAYER RIDGING REMAINS
SITUATED ACROSS THE DEEP SOUTH THIS MORNING. THIS PATTERN WILL
CHANGE LITTLE THROUGH SATURDAY RESULTING IN A CONTINUATION OF THE
HOT TEMPERATURES AND BELOW NORMAL RAIN CHANCES. OUTSIDE OF SCATTERED
SEABREEZE CONVECTION IN FLORIDA LATE THIS AFTERNOON...A WEAK SFC
TROUGH ACROSS CENTRAL GEORGIA MAY TRIGGER A FEW SOUTH GA/AL STORMS
AS WELL. TEMPERATURES WILL PUSH INTO THE UPPER 90S ONCE AGAIN THIS
AFTERNOON.

NOT MUCH WILL CHANGE FOR SATURDAY EXCEPT FOR POSSIBLY A SLIGHT
INCREASE IN LOW LEVEL EASTERLY FLOW. THIS FLOW PATTERN WILL DO
LITTLE TO HELP GENERATE AFTERNOON CONVECTION...AND TEMPS WILL ONCE
AGAIN RISE INTO THE UPPER 90S.

BY SUNDAY...THE UPPER RIDGE BEGINS TO SLIDE EAST WITH THE SFC RIDGE
AXIS LIFTING A BIT NORTH. THIS ALLOWS FOR A MORE SOUTHEASTERLY LOW
LEVEL FLOW. IN ADDITION...DEEP LAYER MOISTURE ASSOCIATED WITH A
TROPICAL WAVE WILL BEGIN TO APPROACH COASTAL AREAS. THESE FACTORS
SHOULD COMBINE FOR AN INCREASE IN POPS SUNDAY AFTERNOON AND AT LEAST
A DEGREE OR TWO DROP IN THE HIGH TEMPERATURES.

.LONG TERM...(SUNDAY NIGHT THROUGH FRIDAY).
THE LONG TERM PERIOD OF THE FORECAST CONTINUES TO REMAIN
UNCERTAIN...THOUGH IT LOOKS LIKE THE MODELS MAY BE FINALLY TRYING TO
CONVERGE ON A SIMILAR SOLUTION. THERE STILL ARE SOME NOTICEABLE
DIFFERENCES WITH RESPECT TO HOW THE MODELS HANDLE THE TROPICAL
SYSTEM IN THE NORTHWEST CARIBBEAN AND THE QUANTITY OF TROPICAL
MOISTURE ASSOCIATED WITH IT. SOME MODELS STILL PREFER A WEAKER
SOLUTION...WHILE OTHERS DEVELOP THE WAVE INTO A TROPICAL
STORM/HURRICANE BUT PREFER A MORE WESTWARD OR SOUTHERN TRACK THROUGH
THE PERIOD. WHILE THE RUN TO RUN CONSISTENCY AMONGST INDIVIDUAL
MODELS HAS BEEN IMPROVING...IT STILL LACKS ENOUGH CONSISTENCY TO
RESULT IN A HIGH CONFIDENCE FORECAST.

THE 24/12Z EURO CAUSES SOME PROBLEMS WITH THE INHERITED FORECAST. IT
PREFERS TO KEEP WHATEVER MOVES OUT OF THE NORTHWEST CARIBBEAN WEAK
UNTIL IT REACHES THE SOUTHWEST GULF...IT ALSO DIRECTS MOST OF THE
DEEP LAYER TROPICAL MOISTURE TO THE SOUTHWEST OF OUR REGION. THIS
RESULTS IN A SLIGHTLY DRIER FORECAST THAN PREVIOUSLY INDICATED. THE
25/00Z GFS STILL CONTINUES TO PREFER MORE OF AN OPEN WAVE SOLUTION
WITH A CONSIDERABLE INFLUX OF TROPICAL MOISTURE BY MONDAY. A QUICK
ANALYSIS OF THE LATEST 25/00Z EURO SHOWS VERY LITTLE DEVIATION FROM
THE PREVIOUS RUN...AND THIS WOULD SEEM TO SUPPORT THE MORE SOUTHERLY
TRACK AND SLIGHTLY DRIER SOLUTION THAT WILL BE DEPICTED IN THIS
FORECAST PACKAGE.

EVEN THOUGH THE MODEL SPREAD CONTINUES TO BE LARGE...THE CONTINUED
WEST NORTHWEST TRACK OF THE WAVE WOULD TEND TO FAVOR A MORE SOUTHERN
SOLUTION...AND LIKELY ALSO RESULT IN A SLIGHT DECREASE IN AVAILABLE
DEEP LAYER MOISTURE. THEREFORE...WILL OPT TO UNDERCUT THE GFS POPS
ONLY SLIGHTLY ON MONDAY AND TUESDAY. THIS WILL STILL RESULT
IN A HIGH POP CHANCE ON MONDAY...WITH SLIGHTLY ABOVE CLIMO POPS
CONTINUING THROUGH THE REMAINDER OF THE FORECAST WITH THE APPROACH
OF A FRONTAL BOUNDARY.

THE EURO SOLUTION CONTINUES TO BE THE PREFERRED ONE WITH RESPECT TO
THE FRONTAL BOUNDARY AND EAST COAST TROF MOVING INTO THE REGION BY
WEDNESDAY/THURSDAY. THIS STALLING FRONTAL BOUNDARY COULD POSE SOME
HEAVY RAIN ISSUES...ESPECIALLY IF ANY REMNANT TROPICAL MOISTURE CAN
FEED INTO THIS SYSTEM. A FRONTAL PASSAGE IS NOT ANTICIPATED WITH
THIS SYSTEM.

TEMPERATURES WILL GENERALLY BE AT OR SLIGHTLY BELOW CLIMATOLOGY FOR
HIGHS BY MONDAY AND CONTINUING INTO THURSDAY...DUE TO SCATTERED TO
NUMEROUS AFTERNOON SHOWERS AND THUNDERSTORMS.

&&

.PRELIMINARY POINT TEMPS/POPS...
TALLAHASSEE   97  74  96  74  95 /  30  20  30  20  50
PANAMA CITY   92  77  92  77  92 /  20  20  30  20  40
DOTHAN        97  74  95  74  95 /  30  20  20  20  40
ALBANY        98  74  97  74  96 /  30  20  20  20  40
VALDOSTA      96  73  96  73  95 /  30  20  20  20  40
CROSS CITY    95  73  95  73  95 /  30  20  30  20  50
APALACHICOLA  91  77  91  77  91 /  20  20  20  20  40

&&

.TAE WATCHES/WARNINGS/ADVISORIES...
AL...NONE.
GA...NONE.
FL...NONE.
GM...NONE.
&&

AUSTIN/CAMP/GODSEY
Hazardous weather outlook, Jun 25, 4:03 AM EDT, 9 hours 33 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TALLAHASSEE FL
403 AM EDT FRI JUN 25 2010

ALZ065>069-FLZ007>019-026>029-034-108-112-114-115-118-127-128-134-
GAZ120>131-142>148-155>161-GMZ730-750-755-765-770-775-261000-
COFFEE-DALE-HENRY-GENEVA-HOUSTON-INLAND WALTON-CENTRAL WALTON-
HOLMES-WASHINGTON-JACKSON-INLAND BAY-CALHOUN-INLAND GULF-
INLAND FRANKLIN-GADSDEN-LEON-INLAND JEFFERSON-MADISON-LIBERTY-
INLAND WAKULLA-INLAND TAYLOR-LAFAYETTE-INLAND DIXIE-SOUTH WALTON-
COASTAL BAY-COASTAL GULF-COASTAL FRANKLIN-COASTAL JEFFERSON-
COASTAL WAKULLA-COASTAL TAYLOR-COASTAL DIXIE-QUITMAN-CLAY-
RANDOLPH-TERRELL-DOUGHERTY-LEE-WORTH-TURNER-TIFT-BEN HILL-IRWIN-
EARLY-MILLER-BAKER-MITCHELL-COLQUITT-COOK-BERRIEN-SEMINOLE-
DECATUR-GRADY-THOMAS-BROOKS-LOWNDES-LANIER-
APALACHEE BAY OR COASTAL WATERS FROM KEATON BEACH TO OCHLOCKONEE
RIVER FL OUT TO 20 NM-
COASTAL WATERS FROM APALACHICOLA TO DESTIN FL OUT 20 NM-
COASTAL WATERS FROM  OCHLOCKONEE RIVER TO APALACHICOLA FL OUT TO
20 NM-
COASTAL WATERS FROM  SUWANNEE RIVER TO KEATON BEACH OUT 20 NM-
WATERS FROM APALACHICOLA TO DESTIN FL FROM 20 TO 60 NM-
WATERS FROM  SUWANNEE RIVER TO APALACHICOLA FL FROM 20 TO 60 NM-
403 AM EDT FRI JUN 25 2010 /303 AM CDT FRI JUN 25 2010/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST ALABAMA...
SOUTHWEST AND SOUTH CENTRAL GEORGIA...AND THE FLORIDA BIG BEND
AND PANHANDLE...AND ADJACENT COASTAL WATERS.

.DAY ONE...TODAY AND TONIGHT...

HIGH PRESSURE AT THE SURFACE AND ALOFT WILL HINDER THE DEVELOPMENT
OF SHOWERS AND THUNDERSTORMS ACROSS THE AREA TODAY WITH ONLY
SCATTERED ACTIVITY EXPECTED. CONDITIONS ARE NOT FAVORABLE FOR
ORGANIZED SEVERE STORMS OR FLOODING AT THIS TIME. AS USUAL FOR THE
SUMMERTIME...THE MAIN THREAT TO LIVES AND PROPERTY WILL BE
LIGHTNING.

TEMPERATURE WILL RISE INTO THE MID AND UPPER 90S THIS AFTERNOON.
HEAT INDICES WILL APPROACH 105 DEGREES.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...

BELOW NORMAL RAIN CHANCES WILL CONTINUE THROUGH SATURDAY. THIS
WILL ALLOW AFTERNOON TEMPERATURES TO RISE INTO THE MID AND UPPER
90S...WITH HEAT INDICES AROUND 105. SHOWERS AND THUNDERSTORMS ARE
EXPECTED TO INCREASE LATE THIS WEEKEND INTO EARLY NEXT WEEK AS
DEEPER MOISTURE OVERSPREADS THE REGION.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED.

FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE
WEBSITE ON THE INTERNET AT WEATHER.GOV...THEN CLICK ON YOUR AREA
OF INTEREST ON THE NATIONAL MAP.

CAMP

In the hours before

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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 25, 5:45 PM EDTAreal Flood AdvisoryTAELeon2 hr

Nearby

Severe Thunderstorm Warnings in Georgia, 2010Every severe thunderstorm warning in 2010

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.