Alert archive / Florida / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 119, NWS Tallahassee, FL

July 30, 2007Gulf County, Liberty County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Jul 30, 2007, 12:43 PM CDT for Gulf County, Liberty County, Florida. It was in force for 47 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
Jul 30, 2007, 12:43 PM CDT (17:43 UTC)
Expired
Jul 30, 2007, 1:30 PM CDT
In force
47 min
Issued by
NWS Tallahassee, FL
Area
Counties, with a storm outline in the text

Counties Gulf County, FL, Liberty County, FL

The radar

The Tallahassee radar (KTLH), 80 km from the middle of the area, began a volume at 17:47 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.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 5.7 hours before the alert went out and 327 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 2007-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1516 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 12:00Z on 2007-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 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
1516 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
759 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
65 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 Jul 30, 8:45 AM CDT, 3 hours 58 minutes earlier.

Area forecast discussion, Jul 30, 8:45 AM CDT, 3 hours 58 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TALLAHASSEE FL
945 AM EDT MON JUL 30 2007

.DISCUSSION...11 UTC SURFACE ANALYSIS SHOWS A QUASI-STATIONARY FRONT
ACROSS THE MID SOUTH FROM NEAR LITTLE ROCK OVER TO BIRMINGHAM AND
EAST-NORTHEASTWARD TO COLUMBIA AND THROUGH THE OUTER BANKS. A 1010
MB SURFACE LOW WAS ALSO NOTED NEAR PEACHTREE CITY. AREAS OF 1018 MB
HIGH PRESSURE WERE ANALYZED ACROSS THE GREAT LAKES. VAPOR IMAGERY
THIS MORNING IS SHOWING A SHORTWAVE MOVING THROUGH CENTRAL KENTUCKY
HEADING SOUTHEAST.

12 UTC UPPER AIR LAUNCH SHOWS QUITE A MOIST ATMOSPHERE WITH A PWAT
OF 2.22 INCHES. LAPSE RATES ABOVE 800 MB ARE RATHER UNIMPRESSIVE AND
GENERALLY 6DEG C/KM UP TO THE TROPOPAUSE. MODIFYING A SURFACE PARCEL
TO 92/69 ONLY YIELDS 1800 J/KG OF SBCAPE WITH AN LI OF -5...AND THIS
MAY BE GENEROUS. STORMS SHOULD BE MORE OF THE PULSE VARIETY TODAY
AND ONLY OFFER A POTENTIAL OF SMALL HAIL (DUE TO SKINNY CAPE IN THE
HAIL GROWTH ZONE)...ISOLATED WET MICROBURSTS AND VERY HEAVY RAIN.

WEST TO NORTHWEST FLOW IN THE 1000-700MB LAYER WILL FAVOR PINNING OF
THE SEA BREEZE FRONTS NEARER TO THE COAST. THE 30/06Z WORKSTATION
WRF ALSO FAVORS AN EARLIER INITIATION TIME OF AROUND 17Z TODAY OVER
THE LANDMASS. WITH EXPECTED BOUNDARY COLLISIONS AND THE PROXIMITY OF
THE SURFACE FRONT WE SHOULD SEE CONVECTION DEVELOP AND SPREAD
THROUGHOUT THE REST OF THE CWA.

CURRENT POP FORECAST LOOKS PRETTY GOOD WITH THE NE TO SW GRADIENT.
GIVEN THAT THE GUIDANCE REMAINS IN THE 60 TO 70 PERCENT RANGE...IM
NOT WILLING TO GO HIGHER (OR LOWER) THAN WHAT IS SHOWN CURRENTLY
ANYWAY. WILL MAKE SOME MINOR TWEAKS TO OTHER FORECAST PARAMETERS.
UPDATED PRODUCTS OUT SHORTLY. HAVE A GREAT DAY

&&

.AVIATION...VFR WILL PREVAIL. HOWEVER...EXPECT MVFR-IFR VSBYS AND
MVFR CIGS IN SCATTERED TO NUMEROUS CONVECTION DURING THE AFTERNOON
AND EARLY EVENING.

&&

.MARINE...
WINDS AND SEAS WILL REMAIN LOW...EXCEPT IN VICINITY OF THUNDERSTORMS
THROUGH THE PERIOD.

&&

.FIRE WEATHER...
WITH HIGH PRECIPITABLE WATER VALUES AND EXPECTED CONVECTION
TODAY...RELATIVE HUMIDITY VALUES SHOULD REMAIN WELL ABOVE CRITICAL
LEVELS.

&&

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

AVIATION...BARRY
REST OF DISCUSSION...GODSEY
Hazardous weather outlook, Jul 30, 3:41 AM CDT, 9 hours 2 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TALLAHASSEE FL
441 AM EDT MON JUL 30 2007

ALZ065>069-FLZ007>019-026>029-034-GAZ120>131-142>148-155>161-
GMZ730-750-755-765-770-775-310845-
COFFEE-DALE-HENRY-GENEVA-HOUSTON-INLAND WALTON-COASTAL WALTON-
HOLMES-WASHINGTON-JACKSON-BAY-CALHOUN-GULF-FRANKLIN-GADSDEN-LEON-
JEFFERSON-MADISON-LIBERTY-WAKULLA-TAYLOR-LAFAYETTE-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-
441 AM EDT MON JUL 30 2007 /341 AM CDT MON JUL 30 2007/

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...
NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED TO
DEVELOP TODAY...ESPECIALLY THIS AFTERNOON AND EVENING. CONDITIONS ARE
NOT FAVORABLE FOR WIDESPREAD SEVERE WEATHER...BUT A FEW STORMS
COULD BRIEFLY PRODUCE STRONG WIND GUSTS AND VERY HEAVY RAIN. OF
COURSE ALL THUNDERSTORMS POSE A THREAT TO LIFE AND PROPERTY
BECAUSE OF LIGHTNING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...
SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS WILL CONTINUE
THROUGH MID WEEK...BUT CONDITIONS DO NOT APPEAR FAVORABLE FOR
WIDESPREAD SEVERE WEATHER. RAIN CHANCES WILL DECREASE BY NEXT
WEEKEND AS A HIGH PRESSURE RIDGE BUILDS OVER THE SOUTHEAST.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NEEDED.

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.

FOURNIER

In the hours before

Special weather statement, Jul 30, 12:17 PM CDT, 26 minutes before
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Special weather statement, Jul 30, 12:34 PM CDT, 9 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
134 PM EDT MON JUL 30 2007

FLZ026-301815-
LIBERTY-
134 PM EDT MON JUL 30 2007

...A SIGNIFICANT WEATHER ALERT IS IN EFFECT FOR LIBERTY COUNTY...

* UNTIL 215 PM EDT

AT 130 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 9 MILES EAST OF BLOUNTSTOWN...MOVING SOUTHEAST AT
10 MPH.

WINDS AROUND 40 MPH ARE EXPECTED WITH THIS STORM.

ALSO...FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS
STORM. MOVE INDOORS IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER
ONE KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

RELAY REPORTS OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE IN
TALLAHASSEE AT (8 5 0) 9 4 2 8 8 3 3. OR...YOU MAY CONTACT THE
NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY EMERGENCY MANAGEMENT.
THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE.

12-WATSON

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 12:54 PM CDTSpecial Marine WarningTAE75 min

Nearby

Severe Thunderstorm Warnings in Florida, 2007Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.