Alert archive / Florida / Mesoscale Discussions in 2003

Mesoscale Discussion 574

April 25, 2003Houston County, Alabama; 12 counties in Florida; Decatur County, Seminole County, Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2003, 7:41 AM CDT for Houston County, Alabama; 12 counties in Florida; Decatur County, Seminole County, Georgia. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
Apr 25, 2003, 7:41 AM CDT (12:41 UTC)
Expired
Apr 25, 2003, 9:15 AM CDT
In force
94 min
Issued by
the Storm Prediction Center

Counties Houston County, AL, Bay County, FL, Calhoun County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Leon County, FL, Liberty County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Decatur County, GA, Seminole County, GA

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 0.7 hours before the alert went out and 127 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, Tallahassee Rgnl, FL at 12:00Z on 2003-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 426 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, Tallahassee Rgnl, FL at 12:00Z on 2003-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 302 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
426 J/kg
Mixed-layer CIN
-68 J/kg
Mixed-layer LCL
718 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
302 m²/s²
0-3 km storm-relative helicity
402 m²/s²
Significant tornado parameter
0.4
Supercell composite
7.7

Open this sounding in Storm Lab

The text

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

048 
ACUS11 KWNS 251241
SWOMCD
SPC MCD 251241 
FLZ000-GAZ000-ALZ000-251415-

MESOSCALE DISCUSSION 0574
NWS STORM PREDICTION CENTER NORMAN OK
0741 AM CDT FRI APR 25 2003

AREAS AFFECTED...EXTREME SERN AL...EXTREME SWRN GA AND FL PNHDL

CONCERNING...TORNADO WATCH 163...

VALID 251241Z - 251415Z

...ISOLD TORNADOES REMAIN POSSIBLE ACROSS THE AREA THIS MORNING...

12Z MESOANALYSIS PLACES THE WARM FRONT FROM SOUTH OF GREENVILLE AL
TO THE CNTRL FL PNHDL.	A SUB-SYNOPTIC LOW HAD FORMED BETWEEN DOTHAN
AND CRESTVIEW...WITH WARM SECTOR AIR MASS/SURFACE DEW POINTS IN THE
70S TRYING TO MOVE ASHORE BETWEEN AAF-TLH.

LARGELY LINEAR MCS THAT DEVELOPED OVER SRN AL-MOBILE BAY AREAS
CONTINUES TO TRACK ESEWD WITH SEVERAL SMALL SCALE BOWS/EMBEDDED
SUPERCELLS.  AIR MASS DOWNSTREAM FROM THESE TSTMS SHOULD DESTABILIZE
AND 12Z TLH RAOB SUGGESTS SUFFICIENT CAPE TO SUPPORT STRONG
UPDRAFTS.  STORM RELATIVE HELICITY BETWEEN THE SURFACE AND 1 KM WAS
ABOVE 300 M2/S2 AND IT IS POSSIBLE FOR ANY EMBEDDED SUPERCELL TO
PRODUCE A TORNADO OR TWO AS THEY MOVE ESEWD INTO THE CNTRL FL PNHDL
AND EXTREME SWRN GA THE NEXT COUPLE OF HOURS.  OTHER STRONGER TSTMS
WILL APPROACH THE PANAMA CITY-APALACHICOLA- WARD RIDGE REGIONS BY
1330-1400 UTC.	ALONG WITH THE TORNADO THREAT...DAMAGING WINDS AND
HAIL WILL BE LIKELY.

..RACY.. 04/25/2003

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...TAE...MOB...

29968686 30478655 31288557 31308495 30568422 29308424
29288567

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 25, 1:15 AM CDTMesoscale DiscussionSPCChoctaw, Clarke, Greene, Hale, Marengo, Pickens and 2 more90 min
Apr 25, 3:05 AM CDTMesoscale DiscussionSPCBaldwin, Bibb, Butler, Choctaw, Clarke, Conecuh and 17 more85 min
Apr 25, 5:40 AM CDTMesoscale DiscussionSPCBaldwin, Coffee, Covington, Dale, Escambia, Geneva and 2 more65 min
Apr 25, 6:05 AM CDTTornado WatchSPCCoffee, Covington, Geneva, Houston6 hr
Apr 25, 11:04 AM CDTMesoscale DiscussionSPCColbert, Franklin, Lauderdale, Marion, Winston116 min
Apr 25, 12:45 PM CDTTornado WatchSPCAutauga, Bibb, Blount, Bullock, Butler, Calhoun and 45 more5 hr
Apr 25, 12:59 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Chilton, Choctaw, Coosa and 15 more2 hr
Apr 25, 3:08 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Bullock, Calhoun, Chambers and 24 more2 hr
Apr 25, 5:16 PM CDTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Bullock, Butler, Chilton and 15 more59 min
Apr 25, 5:40 PM CDTTornado WatchSPCBarbour, Bullock, Butler, Choctaw, Clarke, Coffee and 10 more5 hr
Apr 25, 9:22 AM CDTMesoscale DiscussionSPCGadsden, Hamilton, Jefferson, Leon, Liberty, Madison and 1 more113 min
Apr 25, 10:45 AM CDTSevere Thunderstorm WatchSPCBaker, Columbia, Hamilton, Jefferson, Lafayette, Madison and 3 more5 hr
Apr 25, 12:01 PM CDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Citrus, Clay, Columbia and 15 more119 min
Apr 25, 1:15 PM CDTSevere Thunderstorm WatchSPCAlachua, Bradford, Citrus, Clay, Duval, Flagler and 10 more5 hr
Apr 25, 2:17 PM CDTMesoscale DiscussionSPCAlachua, Bradford, Citrus, Clay, Duval, Flagler and 10 more118 min
Apr 25, 5:35 PM CDTMesoscale DiscussionSPCCitrus, Hernando, Lake, Orange, Pasco, Seminole and 2 more55 min
Apr 25, 5:00 PM CDTTornado WatchSPCBarrow, Bartow, Bibb, Butts, Carroll, Catoosa and 51 more5 hr

Nearby

Mesoscale Discussions in Florida, 2003Mesoscale Discussions in Georgia, 2003Mesoscale Discussions in Alabama, 2003Every mesoscale discussion in 2003

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.