Alert archive / Florida / Mesoscale Discussions in 2003

Mesoscale Discussion 232

March 13, 20034 counties in Alabama; 12 counties in Florida; Seminole County, Georgia

The Storm Prediction Center issued this mesoscale discussion at Mar 13, 2003, 1:58 AM CST for 4 counties in Alabama; 12 counties in Florida; Seminole County, Georgia. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Mar 13, 2003, 1:58 AM CST (07:58 UTC)
Expired: Mar 13, 2003, 4:30 AM CST
In force: 3 hr
Issued by: the Storm Prediction Center

Counties Covington County, AL, Escambia County, AL, Geneva County, AL, Houston County, AL, Bay County, FL, Calhoun County, FL, Escambia County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Liberty County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, Seminole County, GA

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 8.0 hours before the alert went out and 183 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: 1797 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 57 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.

195 
ACUS11 KWNS 130758
SWOMCD
SPC MCD 130758 
FLZ000-GAZ000-ALZ000-131030-

MESOSCALE DISCUSSION 0232
NWS STORM PREDICTION CENTER NORMAN OK
0158 AM CST THU MAR 13 2003

AREAS AFFECTED...EXTREME SRN AL/FL PNHDL

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 130758Z - 131030Z

WW IS NOT CURRENTLY ANTICIPATED...BUT CONVECTIVE TRENDS WILL
CONTINUE TO BE MONITORED.



EVAPORATIVE COOLING ASSOCIATED WITH RELATIVELY DRY LOW/MID-LEVEL
ENVIRONMENT ACROSS THE GULF COAST APPEARS TO HAVE SUPPORTED
DOWNBURST AND THE DEVELOPMENT OF A SURFACE COLD POOL NEAR MOBILE
AL WITHIN THE PAST HOUR. ACTIVITY IS ADVANCING EASTWARD AROUND 40
KT AND LIKELY WILL CONTINUE TO POSE RISK FOR DAMAGING WIND GUSTS
ACROSS THE PENSACOLA/CRESTVIEW/VALPARAISO AREAS OF THE WESTERN
FLORIDA PANHANDLE THROUGH 10Z.



LONGER TERM SEVERE THREAT AS CONVECTIVE SYSTEM ADVANCES EASTWARD
ALONG WEAK LOW-LEVEL BAROCLINIC ZONE ACROSS THE REMAINDER OF THE
FLORIDA PANHANDLE IS STILL UNCERTAIN.  THOUGH FORCING ASSOCIATED
WITH MID-LEVEL TROUGH EMBEDDED WITH SUBTROPICAL BRANCH OF THE
WESTERLIES WILL LIKELY MAINTAIN CONVECTION...LOW-LEVEL FLOW IS
WEAK AND DAMAGING WIND THREAT SHOULD DIMINISH AS COLD POOL
WEAKENS TOWARD DAYBREAK.

..KERR.. 03/13/2003

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

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

30318767 30828738 31248732 31378659 31338570 31158494
30568454 29838493 29688516

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 13, 9:39 AM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Bibb, Blount, Butler, Calhoun and 40 more	2 hr
Mar 13, 10:10 AM CST	Severe Thunderstorm Watch	SPC	Autauga, Bibb, Blount, Butler, Calhoun, Cherokee and 37 more	6 hr
Mar 13, 12:59 PM CST	Mesoscale Discussion	SPC	Autauga, Bibb, Blount, Butler, Calhoun, Chilton and 30 more	2 hr
Mar 13, 2:15 PM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 35 more	2 hr
Mar 13, 3:10 PM CST	Severe Thunderstorm Watch	SPC	Baldwin, Barbour, Bullock, Butler, Coffee, Conecuh and 12 more	5 hr
Mar 13, 5:33 PM CST	Mesoscale Discussion	SPC	Covington	87 min
Mar 13, 5:55 PM CST	Severe Thunderstorm Watch	SPC	Barbour, Dale, Geneva, Henry, Houston, Russell	5 hr
Mar 13, 8:39 AM CST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 24 more	2 hr
Mar 13, 8:55 AM CST	Tornado Watch	SPC	Alachua, Baker, Bradford, Clay, Columbia, Dixie and 10 more	6 hr
Mar 13, 12:55 PM CST	Mesoscale Discussion	SPC	Fannin, Gilmer, Habersham, Murray, Rabun, Stephens and 4 more	2 hr

Nearby

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