Alert archive / Mississippi / Mesoscale Discussions in 2009

Mesoscale Discussion 372

April 2, 20096 counties in Arkansas; 26 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2009, 3:36 PM CDT for 6 counties in Arkansas; 26 counties in Mississippi. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued
Apr 2, 2009, 3:36 PM CDT (20:36 UTC)
Expired
Apr 2, 2009, 4:30 PM CDT
In force
54 min
Issued by
the Storm Prediction Center
All 32 counties

Arkansas County, AR, Chicot County, AR, Desha County, AR, Lee County, AR, Monroe County, AR, Phillips County, AR, Attala County, MS, Bolivar County, MS, Carroll County, MS, Claiborne County, MS, Coahoma County, MS, Copiah County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Leake County, MS, Leflore County, MS, Madison County, MS, Montgomery County, MS, Panola County, MS, Quitman County, MS, Rankin County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Tunica County, MS, Warren County, MS, Washington County, MS, Yalobusha County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 109 km from the middle of the area, began a volume at 20:36 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

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, 8.6 hours before the alert went out and 101 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 2009-04-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1573 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 2009-04-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 164 square meters per square second.1939587897117136Sfc1 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
1573 J/kg
Mixed-layer CIN
-104 J/kg
Mixed-layer LCL
460 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
164 m²/s²
0-3 km storm-relative helicity
211 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.7

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
Apr 2, 1:32 AM CDTMesoscale DiscussionSPCColumbia, Hempstead, Lafayette, Little River, Miller58 min
Apr 2, 4:43 AM CDTSevere Thunderstorm WatchSPCColumbia, Hempstead, Lafayette, Miller, Nevada, Union6 hr
Apr 2, 7:36 AM CDTMesoscale DiscussionSPCColumbia, Hempstead, Lafayette, Miller, Nevada, Ouachita and 1 more54 min
Apr 2, 8:01 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 24 more59 min
Apr 2, 9:24 AM CDTTornado WatchSPCAshley, Chicot7 hr
Apr 2, 12:50 PM CDTMesoscale DiscussionSPCConway, Crawford, Faulkner, Franklin, Garland, Grant and 12 more85 min
Apr 2, 3:56 PM CDTSevere Thunderstorm WatchSPCArkansas, Chicot, Cross, Desha, Drew, Jefferson and 9 more4 hr
Apr 2, 5:36 PM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Jackson and 7 more84 min
Apr 2, 6:21 PM CDTTornado WatchSPCCrittenden, Mississippi3 hr
Apr 2, 6:29 AM CDTTornado WatchSPCGeorge, Greene, Perry, Stone, Wayne8 hr
Apr 2, 10:53 AM CDTTornado WatchSPCAlcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more4 hr
Apr 2, 11:51 AM CDTMesoscale DiscussionSPCAmite, Attala, Carroll, Choctaw, Claiborne, Clarke and 40 more84 min
Apr 2, 1:09 PM CDTMesoscale DiscussionSPCClarke, George, Greene, Harrison, Jackson, Kemper and 6 more66 min
Apr 2, 1:33 PM CDTTornado WatchSPCGeorge, Greene, Perry, Stone, Wayne5 hr

Nearby

Mesoscale Discussions in Mississippi, 2009Mesoscale Discussions in Arkansas, 2009Every mesoscale discussion in 2009

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; radar from the NEXRAD Level II archive.