Alert archive / Mississippi / Mesoscale Discussions in 2003

Mesoscale Discussion 1964

July 22, 2003Washington County, Alabama; 11 parishes in Louisiana; 30 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jul 22, 2003, 6:21 PM CDT for Washington County, Alabama; 11 parishes in Louisiana; 30 counties in Mississippi. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued
Jul 22, 2003, 6:21 PM CDT (23:21 UTC)
Expired
Jul 22, 2003, 7:15 PM CDT
In force
54 min
Issued by
the Storm Prediction Center
All 42 counties

Washington County, AL, East Carroll Parish, LA, East Feliciana Parish, LA, Franklin Parish, LA, Madison Parish, LA, Richland Parish, LA, Saint Helena Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Washington Parish, LA, West Carroll Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hinds County, MS, Issaquena County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Rankin County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Warren County, MS, Wayne County, MS, Wilkinson County, MS

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 11.4 hours before the alert went out and 66 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 12:00Z on 2003-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2581 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, Jackson, MS at 12:00Z on 2003-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 7 square meters per square second.1939Sfc1 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
2581 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
680 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
7 m²/s²
0-3 km storm-relative helicity
62 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 22, 6:40 AM CDTSevere Thunderstorm WatchSPCColbert, Franklin, Lauderdale, Lawrence, Marion, Winston3 hr
Jul 22, 11:31 AM CDTMesoscale DiscussionSPCBullock, Calhoun, Chambers, Chilton, Clay, Cleburne and 8 more119 min
Jul 22, 11:55 AM CDTSevere Thunderstorm WatchSPCAutauga, Bibb, Calhoun, Chambers, Cherokee, Chilton and 19 more5 hr
Jul 22, 1:15 PM CDTMesoscale DiscussionSPCAutauga, Barbour, Bullock, Butler, Chambers, Coffee and 18 more2 hr
Jul 22, 2:30 PM CDTSevere Thunderstorm WatchSPCChoctaw6 hr
Jul 22, 2:40 PM CDTSevere Thunderstorm WatchSPCBaldwin, Barbour, Bullock, Butler, Clarke, Coffee and 16 more5 hr
Jul 22, 1:42 PM CDTMesoscale DiscussionSPCAvoyelles, Bienville, Caldwell, Catahoula, Concordia, De Soto and 15 more2 hr
Jul 22, 4:50 PM CDTMesoscale DiscussionSPCBossier, Caddo, De Soto, Webster85 min
Jul 22, 2:49 AM CDTMesoscale DiscussionSPCCoahoma, DeSoto, Quitman, Tunica116 min
Jul 22, 3:45 AM CDTSevere Thunderstorm WatchSPCCalhoun, Chickasaw, Coahoma, DeSoto, Lafayette, Marshall and 6 more5 hr
Jul 22, 4:47 AM CDTMesoscale DiscussionSPCCoahoma, Quitman, Tate, Tunica118 min
Jul 22, 6:29 AM CDTMesoscale DiscussionSPCAlcorn, Benton, DeSoto, Marshall, Prentiss, Tippah and 2 more91 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.