Alert archive / Mississippi / Mesoscale Discussions in 2003

Mesoscale Discussion 239

March 13, 20035 parishes in Louisiana; 45 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 13, 2003, 11:29 AM CST for 5 parishes in Louisiana; 45 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Mar 13, 2003, 11:29 AM CST (17:29 UTC)
Expired
Mar 13, 2003, 1:30 PM CST
In force
2 hr
Issued by
the Storm Prediction Center
All 50 counties

Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Madison Parish, LA, Tensas Parish, LA, Adams County, MS, Amite County, MS, Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Clay County, MS, Coahoma County, MS, Copiah County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lawrence County, MS, Leake County, MS, Leflore County, MS, Lincoln County, MS, Madison County, MS, Montgomery County, MS, Neshoba County, MS, Oktibbeha County, MS, Pike County, MS, Pontotoc County, MS, Quitman County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Sunflower County, MS, Tallahatchie County, MS, Walthall County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Wilkinson County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 5.5 hours before the alert went out and 53 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, Jackson, MS at 12:00Z on 2003-03-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1303 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, Jackson, MS at 12:00Z on 2003-03-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 158 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
1303 J/kg
Mixed-layer CIN
-63 J/kg
Mixed-layer LCL
597 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
158 m²/s²
0-3 km storm-relative helicity
225 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.4

Open this sounding in Storm Lab

The text

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

881 
ACUS11 KWNS 131729
SWOMCD
SPC MCD 131729 
MSZ000-LAZ000-ARZ000-131930-

MESOSCALE DISCUSSION 0239
NWS STORM PREDICTION CENTER NORMAN OK
1129 AM CST THU MAR 13 2003

AREAS AFFECTED...MS

CONCERNING...SEVERE THUNDERSTORM WATCH 39...

VALID 131729Z - 131930Z

THE THREAT OF DAMAGING WINDS AND LARGE HAIL CONTINUES ACROSS THE
ERN HALF OF WW039.



LATEST REGIONAL RADAR IMAGERY SHOWS LINE OF TSTMS...INCLUDING
EMBEDDED LEWPS...FROM CBM SWWD TO S OF HEZ. THE STRONGEST
ACTIVITY IS OCCURRING FROM JAN SWD TO MCB WHERE AIRMASS HAS
BECOME MODERATELY UNSTABLE WITH MLCAPES OF 1000-1500 J/KG. JAN
VWP/OKOLONA MS PROFILER DATA INDICATE A UNIDIRECTIONAL WIND
PROFILES WITH STRONGER UPSTREAM WINDS --45-50 KT WLY WINDS IN THE
5-6 KM AGL LAYER-- OBSERVED EARLIER AT DEQUEEN AR. COMBINATION OF
MODERATELY UNSTABLE AIRMASS AND INCREASING MID-LEVEL FLOW AHEAD
OF SHORTWAVE TROUGH CURRENTLY MOVING THROUGH AR...WILL SUPPORT A
CONTINUED WIND AND HAIL THREAT WITH ONGOING LINE OF TSTMS.  

..MEAD.. 03/13/2003

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

ATTN...WFO...MEG...JAN...LIX...LCH...

31749184 32579140 33749089 34349061 34318997 34328911
34128846 33048890 31758961 31078991 31119114 31109197

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 13, 7:52 AM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 8 more113 min
Mar 13, 8:30 AM CSTSevere Thunderstorm WatchSPCAcadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 7 more6 hr
Mar 13, 8:50 AM CSTSevere Thunderstorm WatchSPCAvoyelles, Catahoula, Concordia, East Carroll, Franklin, Madison and 1 more5 hr
Mar 13, 10:45 AM CSTSevere Thunderstorm WatchSPCAscension, Assumption, East Baton Rouge, Iberia, Iberville, Jefferson and 12 more5 hr
Mar 13, 10:53 AM CSTMesoscale DiscussionSPCAcadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 5 more2 hr
Mar 13, 1:26 PM CSTMesoscale DiscussionSPCAscension, Assumption, Jefferson, Lafourche, Livingston, Orleans and 5 more2 hr
Mar 13, 2:15 PM CSTMesoscale DiscussionSPCJefferson, Orleans, Plaquemines, Saint Bernard2 hr
Mar 13, 3:53 PM CSTMesoscale DiscussionSPCBeauregard, Calcasieu2 hr
Mar 13, 9:39 AM CSTMesoscale DiscussionSPCClarke, Forrest, George, Greene, Hancock, Harrison and 11 more2 hr
Mar 13, 10:10 AM CSTSevere Thunderstorm WatchSPCClarke, Forrest, George, Greene, Jasper, Jones and 6 more6 hr
Mar 13, 12:59 PM CSTMesoscale DiscussionSPCClarke, Greene, Jones, Kemper, Lauderdale, Noxubee and 2 more2 hr
Mar 13, 3:10 PM CSTSevere Thunderstorm WatchSPCGeorge, Greene, Harrison, Jackson, Pearl River, Perry and 1 more5 hr

Nearby

Mesoscale Discussions in Mississippi, 2003Mesoscale Discussions in Louisiana, 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.