Alert archive / Mississippi / Mesoscale Discussions in 2003
Mesoscale Discussion 2011
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.
- 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
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 10:12 PM CDT | Mesoscale Discussion | SPC | Mississippi | 3 hr |
| Jul 29, 3:36 PM CDT | Mesoscale Discussion | SPC | Clark, Columbia, Dallas, Garland, Grant, Hempstead and 13 more | 2 hr |
| Jul 29, 5:38 PM CDT | Mesoscale Discussion | SPC | Mississippi | 2 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.