Alert archive / Mississippi / Mesoscale Discussions in 2010

Mesoscale Discussion 32

January 20, 2010Ashley County, Chicot County, Arkansas; 9 parishes in Louisiana; 35 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 20, 2010, 11:39 PM CST for Ashley County, Chicot County, Arkansas; 9 parishes in Louisiana; 35 counties in Mississippi. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued
Jan 20, 2010, 11:39 PM CST (05:39 UTC)
Expired
Jan 21, 2010, 12:45 AM CST
In force
66 min
Issued by
the Storm Prediction Center
All 46 counties

Ashley County, AR, Chicot County, AR, East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, Union Parish, LA, West Carroll Parish, LA, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Madison County, MS, Marion County, MS, Neshoba County, MS, Newton County, MS, Perry County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Warren County, MS, Washington County, MS, Wayne County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 89 km from the middle of the area, began a volume at 05:39 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 nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 5.7 hours before the alert went out and 79 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 2010-01-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1838 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 00:00Z on 2010-01-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 144 square meters per square second.1939587897Sfc1 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
1838 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
474 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
144 m²/s²
0-3 km storm-relative helicity
138 m²/s²
Significant tornado parameter
0.7
Supercell composite
3.9

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
Jan 20, 6:17 PM CSTMesoscale DiscussionSPCCrawford, Franklin, Garland, Johnson, Logan, Montgomery and 7 more88 min
Jan 20, 6:42 PM CSTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Chicot, Columbia, Hempstead and 8 more93 min
Jan 20, 8:59 PM CSTMesoscale DiscussionSPCAshley, Bradley, Chicot, Drew, Union91 min
Jan 20, 9:20 PM CSTMesoscale DiscussionSPCClark, Cleveland, Crawford, Dallas, Franklin, Garland and 19 more55 min
Jan 20, 9:36 PM CSTTornado WatchSPCAshley, Bradley, Calhoun, Chicot, Clark, Cleveland and 15 more7 hr
Jan 20, 11:03 PM CSTMesoscale DiscussionSPCCrawford, Franklin, Garland, Hempstead, Howard, Johnson and 9 more87 min
Jan 21, 1:13 AM CSTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Chicot, Clark, Cleveland and 12 more62 min
Jan 21, 3:34 AM CSTMesoscale DiscussionSPCAshley, Chicot, Desha, Drew56 min
Jan 21, 9:55 AM CSTMesoscale DiscussionSPCCraighead, Crittenden, Cross, Greene, Independence, Jackson and 7 more65 min
Jan 21, 12:01 PM CSTTornado WatchSPCClay, Craighead, Greene, Mississippi3 hr
Jan 21, 2:09 AM CSTTornado WatchSPCGeorge, Greene, Perry, Stone, Wayne7 hr

Nearby

Mesoscale Discussions in Mississippi, 2010Mesoscale Discussions in Louisiana, 2010Mesoscale Discussions in Arkansas, 2010Every mesoscale discussion in 2010

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.