Alert archive / Mississippi / Mesoscale Discussions in 2003

Mesoscale Discussion 2011

July 29, 2003Franklin County, Lamar County, Marion County, Alabama; Chicot County, Desha County, Drew County, Arkansas; 31 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jul 29, 2003, 10:42 AM CDT for Franklin County, Lamar County, Marion County, Alabama; Chicot County, Desha County, Drew County, Arkansas; 31 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 29, 2003, 10:42 AM CDT (15:42 UTC)
Expired
Jul 29, 2003, 12:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 37 counties

Franklin County, AL, Lamar County, AL, Marion County, AL, Chicot County, AR, Desha County, AR, Drew County, AR, Attala County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Itawamba County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Lowndes County, MS, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Pontotoc County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 3.7 hours before the alert went out and 133 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, Little Rock, AR at 12:00Z on 2003-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 587 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, Little Rock, AR at 12:00Z on 2003-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 square meters per square second.1939Sfc1 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
587 J/kg
Mixed-layer CIN
-125 J/kg
Mixed-layer LCL
1756 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
14 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.

574 
ACUS11 KWNS 291542
SWOMCD
SPC MCD 291542 
ALZ000-MSZ000-ARZ000-LAZ000-291745-

MESOSCALE DISCUSSION 2011
NWS STORM PREDICTION CENTER NORMAN OK
1042 AM CDT TUE JUL 29 2003

AREAS AFFECTED...CENTRAL AND NRN MS...NWRN AL...SERN AR...NERN LA

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 291542Z - 291745Z

THUNDERSTORMS ARE EXPECTED TO INTENSIFY OVER THE NEXT SEVERAL HOURS.
 A WW MAY BECOME NECESSARY.

LATEST RADAR AND SATELLITE SHOW CONVECTION INCREASING IN INTENSITY
ALONG SRN EDGE OF COLD POOL FROM EARLY MORNING CONVECTIVE SYSTEM. 
THE AIR MASS AHEAD OF THIS SYSTEM IS BECOMING VERY UNSTABLE WITH
MLCAPES OF 2500-3500 J/KG EXPECTED BY MIDDAY.  PRESENCE OF MESOSCALE
HIGH IN ASSOCIATION WITH COLD POOL AND INCREASING INSTABILITY
SUGGESTS DAMAGING WINDS WILL BECOME INCREASINGLY LIKELY...ESPECIALLY
OVER N CNTRL MS. WEAK SWLY SURFACE FLOW WILL ALOW WRN EDGE OF
CONVECTIVE LINE TO BUILD INTO SERN AR AND NERN LA BY EARLY
AFTERNOON.  

NOTE:  A SLIGHT RISK WILL BE ADDED IN THE 1630 DAY 1 OUTLOOK.

..JEWELL.. 07/29/2003

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

ATTN...WFO...BMX...HUN...MEG...JAN...LZK...

33789203 34169006 34668774 34068746 32658872 32379082

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 28, 10:12 PM CDTMesoscale DiscussionSPCMississippi3 hr
Jul 29, 3:36 PM CDTMesoscale DiscussionSPCClark, Columbia, Dallas, Garland, Grant, Hempstead and 13 more2 hr
Jul 29, 5:38 PM CDTMesoscale DiscussionSPCMississippi2 hr

Nearby

Mesoscale Discussions in Mississippi, 2003Mesoscale Discussions in Alabama, 2003Mesoscale Discussions in Arkansas, 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.