Alert archive / Florida / Mesoscale Discussions in 2003

Mesoscale Discussion 704

May 3, 2003Baldwin County, Escambia County, Mobile County, Alabama; 9 counties in Florida; 5 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 3, 2003, 11:24 AM CDT for Baldwin County, Escambia County, Mobile County, Alabama; 9 counties in Florida; 5 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 3, 2003, 11:24 AM CDT (16:24 UTC)
Expired
May 3, 2003, 1:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center

Counties Baldwin County, AL, Escambia County, AL, Mobile 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, George County, MS, Greene County, MS, Jackson County, MS, Perry County, MS, Stone County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 4.4 hours before the alert went out and 216 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, Slidell Radar S, LA at 12:00Z on 2003-05-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1897 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, Slidell Radar S, LA at 12:00Z on 2003-05-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 square meters per square second.19395878Sfc1 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
1897 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
750 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
73 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

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

858 
ACUS11 KWNS 031624
SWOMCD
SPC MCD 031624 
FLZ000-ALZ000-MSZ000-031830-

MESOSCALE DISCUSSION 0704
NWS STORM PREDICTION CENTER NORMAN OK
1124 AM CDT SAT MAY 03 2003

AREAS AFFECTED...SERN MS...SRN AL AND THE WRN FL PANHANDLE

CONCERNING...SEVERE THUNDERSTORM WATCH 219...

VALID 031624Z - 031830Z

THREAT FOR DAMAGING WIND AND LARGE HAIL EXPECTED TO PERSIST THROUGH
19Z...MAINLY OVER EXTREME SERN MS...SWRN AL AND THE EXTREME WRN FL
PANHANDLE.

DUE TO PROPAGATION EFFECTS ASSOCIATED WITH SWLY LOW LEVEL
FLOW...STORMS HAVE BEGUN MOVING ALMOST DUE SOUTH AT AROUND 20 TO 25
KT WITH SOME BACKBUILDING INTO EXTREME SERN MS. ACTIVITY SHOULD
CONTINUE DEVELOPING SWD SUPPORTED BY SSWLY 0-2 KM STORM RELATIVE
INFLOW FROM DESTABILIZING WARM SECTOR WHERE MLCAPES RANGE FROM 2000
TO 2500 J/KG. CIRRUS SHIELD IS LIMITING DESTABILIZATION OVER THE
CNTRL FL PANHANDLE INCLUDING ERN PARTS OF WW 219...SO GREATER THREAT
IS EXPECTED TO REMAIN OVER THE WRN PARTS OF THE WW. ACTIVITY WILL
LIKELY BEGIN MOVING OFFSHORE BY 1830Z.


..DIAL.. 05/03/2003

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

ATTN...WFO...TAE...MOB...JAN...LIX...

31328792 31208656 30908520 29938509 30088649 30328805
30468939 30818943 31228919

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 2, 7:38 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 36 more97 min
May 3, 8:45 AM CDTMesoscale DiscussionSPCCoffee, Conecuh, Covington, Dale, Escambia, Geneva and 2 more2 hr
May 3, 9:15 AM CDTSevere Thunderstorm WatchSPCBaldwin, Coffee, Conecuh, Covington, Escambia, Geneva and 4 more6 hr
May 3, 4:36 PM CDTMesoscale DiscussionSPCChoctaw, Mobile, Washington114 min
May 3, 2:36 AM CDTMesoscale DiscussionSPCBolivar, Carroll, Coahoma, DeSoto, Grenada, Humphreys and 12 more24 min
May 3, 12:29 PM CDTMesoscale DiscussionSPCClaiborne, Copiah, Hinds, Issaquena, Jefferson, Lawrence and 1 more3 hr
May 3, 4:45 PM CDTSevere Thunderstorm WatchSPCAdams, Amite, Claiborne, Clarke, Copiah, Covington and 27 more5 hr

Nearby

Mesoscale Discussions in Florida, 2003Mesoscale Discussions in Mississippi, 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.