Alert archive / Florida / Mesoscale Discussions in 2003

Mesoscale Discussion 573

April 25, 20038 counties in Alabama; 9 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2003, 5:40 AM CDT for 8 counties in Alabama; 9 counties in Florida. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Apr 25, 2003, 5:40 AM CDT (10:40 UTC)
Expired: Apr 25, 2003, 6:45 AM CDT
In force: 65 min
Issued by: the Storm Prediction Center

Counties Baldwin County, AL, Coffee County, AL, Covington County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Bay County, FL, Calhoun County, FL, Escambia County, FL, Holmes County, FL, Jackson County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 163Apr 25, 6:05 AM CDT

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 10.7 hours before the alert went out and 205 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1277 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 208 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

485 
ACUS11 KWNS 251041
SWOMCD
SPC MCD 251040 
FLZ000-GAZ000-ALZ000-251145-

MESOSCALE DISCUSSION 0573
NWS STORM PREDICTION CENTER NORMAN OK
0540 AM CDT FRI APR 25 2003

AREAS AFFECTED...FL PNHDL...EXTREME SERN AL

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 251040Z - 251145Z

MESOANALYSIS DEPICTS WARM FRONT SITUATED NW-SE ACROSS CNTRL/SERN AL
AND THE FL PNHDL EARLY THIS MORNING.  A SMALL TSTM THAT DEVELOPED
NORTH OF PNS GREW INTO A SUPERCELL AND PRODUCED A DAMAGING TORNADO
IN OKALOOSA COUNTY.  THIS CELL WILL PASS THROUGH THE REMAINDER OF
NRN WALTON COUNTY BY 1045 UTC...THEN LIKELY WEAKEN AS IT MOVES EAST
OF THE WARM FRONT.  

UPSTREAM...MOB VWP SHOWS THAT THE WINDS FLOW HAS STRONGLY VEERED IN
THE PAST HOUR OR SO...AND SW-NE ORIENTED LINE OF CONVECTION WILL
PROGRESS FROM WEST-EAST ACROSS THE REGION IN THE NEXT FEW HOURS.  IT
IS POSSIBLE THAT OTHER ISOLD TORNADOES MAY OCCUR AS ANY TSTM
DEVELOPS AND MOVES INTO THE ENHANCED SRH AXIS ALONG THE WARM FRONT. 
BUT...LINEAR CHARACTER OF THE APPROACHING TSTMS SUGGESTS LOCALLY
DAMAGING WIND GUSTS OR HAIL WILL BE THE PRIMARY THREATS.

WW IS BEING CONSIDERED.

..RACY.. 04/25/2003

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

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

30678785 31608672 31618528 30718487 30178502 29688546
29638690 30048792

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 25, 1:15 AM CDT	Mesoscale Discussion	SPC	Choctaw, Clarke, Greene, Hale, Marengo, Pickens and 2 more	90 min
Apr 25, 3:05 AM CDT	Mesoscale Discussion	SPC	Baldwin, Bibb, Butler, Choctaw, Clarke, Conecuh and 17 more	85 min
Apr 25, 6:05 AM CDT	Tornado Watch	SPC	Coffee, Covington, Geneva, Houston	6 hr
Apr 25, 7:41 AM CDT	Mesoscale Discussion	SPC	Houston	94 min
Apr 25, 11:04 AM CDT	Mesoscale Discussion	SPC	Colbert, Franklin, Lauderdale, Marion, Winston	116 min
Apr 25, 12:45 PM CDT	Tornado Watch	SPC	Autauga, Bibb, Blount, Bullock, Butler, Calhoun and 45 more	5 hr
Apr 25, 12:59 PM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Blount, Chilton, Choctaw, Coosa and 15 more	2 hr
Apr 25, 3:08 PM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Blount, Bullock, Calhoun, Chambers and 24 more	2 hr
Apr 25, 5:16 PM CDT	Mesoscale Discussion	SPC	Autauga, Barbour, Bibb, Bullock, Butler, Chilton and 15 more	59 min
Apr 25, 5:40 PM CDT	Tornado Watch	SPC	Barbour, Bullock, Butler, Choctaw, Clarke, Coffee and 10 more	5 hr
Apr 25, 9:22 AM CDT	Mesoscale Discussion	SPC	Gadsden, Hamilton, Jefferson, Leon, Liberty, Madison and 1 more	113 min
Apr 25, 10:45 AM CDT	Severe Thunderstorm Watch	SPC	Baker, Columbia, Hamilton, Jefferson, Lafayette, Madison and 3 more	5 hr
Apr 25, 12:01 PM CDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 15 more	119 min
Apr 25, 1:15 PM CDT	Severe Thunderstorm Watch	SPC	Alachua, Bradford, Citrus, Clay, Duval, Flagler and 10 more	5 hr
Apr 25, 2:17 PM CDT	Mesoscale Discussion	SPC	Alachua, Bradford, Citrus, Clay, Duval, Flagler and 10 more	118 min
Apr 25, 5:35 PM CDT	Mesoscale Discussion	SPC	Citrus, Hernando, Lake, Orange, Pasco, Seminole and 2 more	55 min

Nearby

Mesoscale Discussions in Florida, 2003 Mesoscale Discussions in Alabama, 2003 Every 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.