Alert archive / Mississippi / Mesoscale Discussions in 2003

Mesoscale Discussion 565

April 24, 2003Baldwin County, Mobile County, Washington County, Alabama; Orleans Parish, Saint Tammany Parish, Washington Parish, Louisiana; 11 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2003, 5:17 PM CDT for Baldwin County, Mobile County, Washington County, Alabama; Orleans Parish, Saint Tammany Parish, Washington Parish, Louisiana; 11 counties in Mississippi. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Apr 24, 2003, 5:17 PM CDT (22:17 UTC)
Expired: Apr 24, 2003, 7:15 PM CDT
In force: 118 min
Issued by: the Storm Prediction Center

Counties Baldwin County, AL, Mobile County, AL, Washington County, AL, Orleans Parish, LA, Saint Tammany Parish, LA, Washington Parish, LA, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Lamar County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 94 km from the middle of the area, began a volume at 22:20 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 watches that followed

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

Tornado Watch 161Apr 24, 7:50 PM CDT

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.3 hours before the alert went out and 79 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: 479 J/kg
Mixed-layer CIN: -166 J/kg
Mixed-layer LCL: 990 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 233 m²/s²
0-3 km storm-relative helicity: 329 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

950 
ACUS11 KWNS 242217
SWOMCD
SPC MCD 242217 
FLZ000-ALZ000-MSZ000-LAZ000-250015-

MESOSCALE DISCUSSION 0565
NWS STORM PREDICTION CENTER NORMAN OK
0517 PM CDT THU APR 24 2003

AREAS AFFECTED...SERN LA / SERN MS / SWRN AL

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 242217Z - 250015Z

LOCAL SEVERE THREAT IS EXPECTED TO PERSIST ACROSS A SMALL AREA FROM
SERN LA INTO FAR SWRN AL...BUT WW NOT ANTICIPATED ATTM DUE AS THREAT
SHOULD REMAIN LIMITED FROM BOTH AN AREAL AND A TEMPORAL PERSPECTIVE.


LATEST SURFACE ANALYSIS SHOWS AN APPARENT WARM FRONT FROM WRN MS
SSEWD ACROSS FAR SERN LA...WITH A SECONDARY / OUTFLOW BOUNDARY
ACROSS CENTRAL MS INTO SRN AL.	SOUTH OF THE CONVECTIVE
BOUNDARY...AIRMASS REMAINS MOIST AND MODERATELY UNSTABLE...WITH
MEAN-LAYER CAPE 1000-2000 J/KG ATTM.

DEEP-LAYER WIND FIELD REMAINS MODERATELY STRONG WITH SOME VEERING
EVIDENT AT LOW LEVELS PARTICULARLY ACROSS SERN MS WHERE SURFACE FLOW
IS SOMEWHAT BACKED NORTH OF WARM FRONT.  THIS FAVORABLE COMBINATION
OF CAPE AND SHEAR IS SUPPORTING AN ISOLATED SUPERCELL NOW
APPROACHING SRN PORTIONS OF FORREST AND PERRY COUNTIES IN SERN MS. 
THIS REMAINS THE ONLY SIGNIFICANT STORM ACROSS THIS REGION...AND
WIDESPREAD ADDITIONAL DEVELOPMENT IS NOT ANTICIPATED OVER THIS
REGION.  THEREFORE...ALTHOUGH A THREAT FOR LOCALLY DAMAGING WINDS OR
HAIL AND PERHAPS A BRIEF TORNADO WITH THIS STORM...LIMITED THREAT
BEYOND THIS STORM SUGGESTS THAT WW WILL NOT BE REQUIRED.


..GOSS.. 04/24/2003

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

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

30529037 31338972 31888847 31168785 30348742 29969024

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 24, 2:46 PM CDT	Mesoscale Discussion	SPC	Bibb, Choctaw, Dallas, Fayette, Greene, Hale and 6 more	119 min
Apr 23, 11:43 PM CDT	Mesoscale Discussion	SPC	Bossier, Caddo, De Soto	2 hr
Apr 24, 2:41 AM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Webster	2 hr
Apr 24, 6:30 AM CDT	Severe Thunderstorm Watch	SPC	Avoyelles, Beauregard, Bienville, Caldwell, Catahoula, Concordia and 17 more	5 hr
Apr 24, 6:40 AM CDT	Severe Thunderstorm Watch	SPC	Avoyelles, Beauregard, Bienville, Caldwell, Catahoula, Concordia and 17 more	4 hr
Apr 24, 9:39 AM CDT	Mesoscale Discussion	SPC	Caldwell, Catahoula, Concordia, Grant, LaSalle, Tensas and 1 more	2 hr
Apr 24, 11:40 AM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Caldwell, Catahoula, Concordia and 10 more	65 min
Apr 24, 1:00 PM CDT	Tornado Watch	SPC	Bossier, Caddo, Claiborne, Webster	7 hr
Apr 24, 2:05 PM CDT	Tornado Watch	SPC	Bienville, Caldwell, Catahoula, Concordia, East Carroll, Franklin and 14 more	6 hr
Apr 24, 6:49 PM CDT	Mesoscale Discussion	SPC	Catahoula, Concordia, East Carroll, Franklin, Madison, Richland and 2 more	56 min
Apr 24, 5:52 PM CDT	Mesoscale Discussion	SPC	Coahoma, DeSoto, Quitman, Tate, Tunica	113 min
Apr 24, 6:35 PM CDT	Tornado Watch	SPC	Bolivar, Coahoma, DeSoto, Panola, Quitman, Tallahatchie and 1 more	5 hr

Nearby

Mesoscale Discussions in Mississippi, 2003 Mesoscale Discussions in Alabama, 2003 Mesoscale Discussions in Louisiana, 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; radar from the NEXRAD Level II archive.