Alert archive / Mississippi / Mesoscale Discussions in 2003

Mesoscale Discussion 710

May 3, 2003Choctaw County, Mobile County, Washington County, Alabama; 8 parishes in Louisiana; 33 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 3, 2003, 4:36 PM CDT for Choctaw County, Mobile County, Washington County, Alabama; 8 parishes in Louisiana; 33 counties in Mississippi. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued
May 3, 2003, 4:36 PM CDT (21:36 UTC)
Expired
May 3, 2003, 6:30 PM CDT
In force
114 min
Issued by
the Storm Prediction Center
All 44 counties

Choctaw County, AL, Mobile County, AL, Washington County, AL, Livingston Parish, LA, Orleans Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Amite County, MS, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Hinds County, MS, Jackson County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Newton County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.6 hours before the alert went out and 117 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, Slidell Radar S, LA at 12:00Z on 2003-05-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1897 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, Slidell Radar S, LA at 12:00Z on 2003-05-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 square meters per square second.19395878Sfc1 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
1897 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
750 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
73 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

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

766 
ACUS11 KWNS 032136
SWOMCD
SPC MCD 032136 
ALZ000-MSZ000-LAZ000-032330-

MESOSCALE DISCUSSION 0710
NWS STORM PREDICTION CENTER NORMAN OK
0436 PM CDT SAT MAY 03 2003

AREAS AFFECTED...CENTRAL AND SRN MS...ERN SOUTH LA

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 032136Z - 032330Z

A WW WILL BE ISSUED SHORTLY.  LARGE HAIL AND DAMAGING WINDS WILL BE
POSSIBLE.

LATEST SURFACE ANALYSIS SHOWS WEAK LOW PRESSURE TROUGH EXTENDING
FROM CENTRAL LA EWD INTO SRN MS.  MODIFIED 18Z JAN SOUNDING SHOWS
ANYWHERE FROM 2500-3500 MLCAPE VALUES.	WLY FLOW AVERAGING 10-15 KTS
IN THE LOWEST 3 KM WILL FEED STORMS WITH STRONG INSTABILITY...WHILE
SUFFICIENT DEEP LAYER SHEAR WILL ALLOW FOR A FEW SUPERCELLS WITH
LARGE HAIL.  DAMAGING WINDS WILL BE MORE LIKELY IF LARGE CLUSTER OF
CELLS CAN FORM AND GET AN ORGANIZED COLD POOL GOING.  ALTHOUGH AREA
RAOBS AND VWPS SHOW LITTLE IN THE WAY OF SRH...SUPERCELL CHANCES
WILL BE MAXIMIZED WITH SOUTHERLY MOVING CELLS.	

..JEWELL.. 05/03/2003

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

ATTN...WFO...BMX...MOB...JAN...LIX...

31979132 32708939 32328843 31278778 30138813 30178930
29789059

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 2, 7:38 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 36 more97 min
May 3, 8:45 AM CDTMesoscale DiscussionSPCCoffee, Conecuh, Covington, Dale, Escambia, Geneva and 2 more2 hr
May 3, 9:15 AM CDTSevere Thunderstorm WatchSPCBaldwin, Coffee, Conecuh, Covington, Escambia, Geneva and 4 more6 hr
May 3, 11:24 AM CDTMesoscale DiscussionSPCBaldwin, Escambia, Mobile2 hr
May 3, 2:36 AM CDTMesoscale DiscussionSPCCaldwell, Catahoula, East Carroll, Franklin, Jackson, LaSalle and 9 more24 min
May 3, 12:29 PM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Claiborne, East Carroll and 11 more3 hr
May 3, 1:40 PM CDTTornado WatchSPCBienville, Bossier, Caddo, De Soto, Natchitoches, Red River and 1 more6 hr
May 3, 3:42 PM CDTMesoscale DiscussionSPCBossier, Caddo, De Soto, Red River, Webster2 hr
May 3, 4:45 PM CDTSevere Thunderstorm WatchSPCConcordia, East Baton Rouge, East Carroll, East Feliciana, Franklin, Livingston and 9 more5 hr
May 3, 6:49 PM CDTMesoscale DiscussionSPCBossier, Caddo, De Soto, Red River, Webster56 min

Nearby

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