Alert archive / Mississippi / Mesoscale Discussions in 2003

Mesoscale Discussion 2115

August 7, 200315 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Aug 7, 2003, 12:38 AM CDT for 15 counties in Mississippi. It was in force for 37 min.

The area

The outline as issued.

The facts

Issued
Aug 7, 2003, 12:38 AM CDT (05:38 UTC)
Expired
Aug 7, 2003, 1:15 AM CDT
In force
37 min
Issued by
the Storm Prediction Center

Counties Clarke County, MS, Copiah County, MS, Covington County, MS, Hinds County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Lauderdale County, MS, Lawrence County, MS, Newton County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Wayne County, MS

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 5.6 hours before the alert went out and 69 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 00:00Z on 2003-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4421 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 2003-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 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
4421 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1023 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
157 m²/s²
Significant tornado parameter
2.4
Supercell composite
11.7

Open this sounding in Storm Lab

The text

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

000 
ACUS11 KWNS 070539
SWOMCD
SPC MCD 070538 
ALZ000-MSZ000-070615-

MESOSCALE DISCUSSION 2115
NWS STORM PREDICTION CENTER NORMAN OK
1238 AM CDT THU AUG 07 2003

AREAS AFFECTED...MS AL

CONCERNING...SEVERE THUNDERSTORM WATCH 849...

VALID 070538Z - 070615Z

WW WILL EXPIRE AS SCHEDULED AT 06Z.


STORMS FROM JAN TO MEI AND SWD TO HEZ AND MCB CONTINUE TO MOVE SWD
AND SLOWLY WEAKEN WITH LOSS OF DAYTIME HEATING. AN ISOLATED SEVERE
STORM IS POSSIBLE DURING THE NEXT HOUR OR SO...BUT WITH THE STORMS
EXPECTED TO CONTINUE SLOWLY WEAKENING....WW WILL EXPIRE AT 06Z.

..IMY.. 08/07/2003

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

ATTN...WFO...MOB...JAN...

31448986 31729075 32439054 32578940 32398855 31628830
31388935

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 6, 7:45 PM CDTSevere Thunderstorm WatchSPCAttala, Carroll, Choctaw, Clarke, Covington, Forrest and 30 more5 hr
Aug 6, 9:34 PM CDTMesoscale DiscussionSPCAttala, Carroll, Choctaw, Clarke, Covington, Forrest and 31 more86 min

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.