Alert archive / Mississippi / Mesoscale Discussions in 2003
Mesoscale Discussion 976
The Storm Prediction Center issued this mesoscale discussion at May 14, 2003, 2:28 PM CDT for 24 counties in Mississippi. It was in force for 62 min.
The area
The outline as issued.
The facts
- Issued
- May 14, 2003, 2:28 PM CDT (19:28 UTC)
- Expired
- May 14, 2003, 3:30 PM CDT
- In force
- 62 min
- Issued by
- the Storm Prediction Center
All 24 counties
Attala County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Holmes County, MS, Humphreys County, MS, Kemper County, MS, Lauderdale County, MS, Leake County, MS, Leflore County, MS, Madison County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Scott County, MS, Sharkey County, MS, Sunflower County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yazoo County, MS
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Jackson, MS (KJAN), launched 12:00Z, 7.5 hours before the alert went out and 146 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
- 56 J/kg
- Mixed-layer CIN
- -185 J/kg
- Mixed-layer LCL
- 564 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 205 m²/s²
- 0-3 km storm-relative helicity
- 241 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
249 ACUS11 KWNS 141928 SWOMCD SPC MCD 141928 ALZ000-MSZ000-142030- MESOSCALE DISCUSSION 0976 NWS STORM PREDICTION CENTER NORMAN OK 0228 PM CDT WED MAY 14 2003 AREAS AFFECTED...NRN / CENTRAL MS... CONCERNING...SEVERE THUNDERSTORM WATCH 368... VALID 141928Z - 142030Z THUNDERSTORMS CONTINUE TO MOVE EWD ACROSS ERN PORTIONS OF WW. SEVERE THREAT HAS REMAINED LOW...AND THUS WW MAY BE CANCELLED PRIOR TO ITS SCHEDULED 14/22Z EXPIRATION. LATEST RADAR IMAGERY SHOWS THUNDERSTORMS MOVING ACROSS ERN PORTIONS OF WW ATTM...WITH SOME NEW CONVECTIVE DEVELOPMENT INVOF SRN PORTIONS OF WW NEAR JAN. BOUNDARY-LAYER AIRMASS HAS REMAINED STABLE ON THE COOL SIDE OF NW-SE SURFACE FRONT OVER CENTRAL MS PRECLUDING A WIDESPREAD SEVERE THREAT...BUT SOME DESTABILIZATION HAS OCCURRED ON THE WARM SIDE OF BOUNDARY. NONETHELESS...18Z JAN RAOB INDICATES RELATIVELY WEAK INSTABILITY /AROUND 1000 J/KG MEAN-LAYER CAPE/ AND MARGINAL DEEP-LAYER WIND FIELD...SUGGESTING THAT ANY FURTHER THUNDERSTORM DEVELOPMENT SHOULD REMAIN MARGINALLY-SEVERE AT BEST. GIVEN CURRENT THINKING...WW MAY BE CANCELLED IN THE NEXT HOUR OR SO. ..GOSS.. 05/14/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MOB...MEG...JAN... 34068891 33898850 31998845 32919099 33739096 33538996 34008891
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 14, 10:26 AM CDT | Mesoscale Discussion | SPC | Attala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 28 more | 94 min |
| May 14, 11:10 AM CDT | Severe Thunderstorm Watch | SPC | Attala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 26 more | 6 hr |
| May 14, 6:10 PM CDT | Severe Thunderstorm Watch | SPC | Claiborne, Copiah, Covington, Hinds, Issaquena, Jefferson and 13 more | 6 hr |
Nearby
Mesoscale Discussions in Mississippi, 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.