Alert archive / Mississippi / Mesoscale Discussions in 2003
Mesoscale Discussion 121
The Storm Prediction Center issued this mesoscale discussion at Feb 22, 2003, 2:02 AM CST for Chicot County, Arkansas; 12 parishes in Louisiana; 40 counties in Mississippi. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 22, 2003, 2:02 AM CST (08:02 UTC)
- Expired
- Feb 22, 2003, 5:00 AM CST
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 53 counties
Chicot County, AR, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Adams County, MS, Attala County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Clay 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, Lafayette County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Madison County, MS, Montgomery County, MS, Neshoba County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Union 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 00:00Z, 8.0 hours before the alert went out and 86 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 589 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 164 m²/s²
- 0-3 km storm-relative helicity
- 289 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
874 ACUS11 KWNS 220802 SWOMCD SPC MCD 220802 LAZ000-MSZ000-221100- MESOSCALE DISCUSSION 0121 NWS STORM PREDICTION CENTER NORMAN OK 0202 AM CST SAT FEB 22 2003 AREAS AFFECTED...NERN LA / W CENTRAL AND NRN MS CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 220802Z - 221100Z SEVERE THREAT IS EXPECTED TO INCREASE LATER THIS MORNING FROM NERN LA INTO ADJACENT W CENTRAL MS...AND EVENTUALLY NWD INTO NRN MS AHEAD OF STRONG / DEEPENING SURFACE LOW. WW MAY BE REQUIRED IF STORMS DO INDEED DEVELOP ACROSS THIS REGION. LATEST SURFACE ANALYSIS SHOWS DEEPENING LOW OVER NRN LA...WHICH IS EXPECTED TO MOVE INTO W CENTRAL MS OVER THE NEXT SEVERAL HOURS AHEAD OF STRONG VORT MAX OVER NWRN LA. MARGINAL / MAINLY ELEVATED INSTABILITY EXISTS ACROSS THIS REGION...BUT VERY STRONG FORCING SUGGESTS THAT THUNDERSTORMS WILL DEVELOP OVER THE NEXT COUPLE OF HOURS. VERY STRONG WIND FIELD /65 KT 0-6 KM SHEAR PER LATEST OKOLONA MS PROFILER/ WOULD SUPPORT ROTATION WITH ANY SUSTAINED UPDRAFT. MAIN SEVERE THREAT APPEARS TO BE LARGE HAIL ACROSS THIS REGION. HOWEVER...AS LOW-LEVEL THETA-E ADVECTION CONTINUES AHEAD OF APPROACHING LOW...STABLE LAYER NEAR THE SURFACE SHOULD BECOME INCREASINGLY WEAKER / SHALLOWER -- PARTICULARLY ACROSS SRN PORTIONS OF THE THREAT AREA. THUS...THREAT FOR DAMAGING WINDS AND PERHAPS A TORNADO OR TWO MAY ALSO INCREASE ROUGHLY ALONG AND SOUTH OF A LINE FROM MLU TO GWO. ..GOSS.. 02/22/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... 32999190 33729110 34588979 34458850 33278859 32258943 31019148 31339208 32219229
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 21, 7:26 PM CST | Mesoscale Discussion | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Livingston, Orleans and 9 more | 2 hr |
| Feb 21, 8:15 PM CST | Tornado Watch | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 17 more | 6 hr |
| Feb 21, 10:22 PM CST | Mesoscale Discussion | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 17 more | 113 min |
| Feb 21, 10:54 PM CST | Mesoscale Discussion | SPC | Beauregard, Bienville, Bossier, Caddo, De Soto, Natchitoches and 4 more | 3 hr |
| Feb 21, 11:14 PM CST | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Catahoula, De Soto, Grant and 6 more | 4 hr |
| Feb 22, 12:35 AM CST | Tornado Watch | SPC | Jefferson, Orleans, Saint Bernard, Saint Tammany | 5 hr |
| Feb 22, 3:51 AM CST | Mesoscale Discussion | SPC | Jefferson, Orleans, Saint Bernard, Saint Tammany | 114 min |
| Feb 21, 9:03 PM CST | Mesoscale Discussion | SPC | Attala, Chickasaw, Choctaw, Clarke, Clay, Jasper and 16 more | 3 hr |
| Feb 21, 9:30 PM CST | Severe Thunderstorm Watch | SPC | Attala, Choctaw, Clarke, Clay, Jasper, Kemper and 15 more | 7 hr |
| Feb 21, 10:40 PM CST | Mesoscale Discussion | SPC | Attala, Choctaw, Clarke, Clay, Jasper, Kemper and 15 more | 2 hr |
Nearby
Mesoscale Discussions in Mississippi, 2003Mesoscale Discussions in Louisiana, 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.