Alert archive / Arkansas / Mesoscale Discussions in 2005

Mesoscale Discussion 406

March 26, 200510 counties in Arkansas; 5 parishes in Louisiana; 6 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 26, 2005, 9:18 PM CST for 10 counties in Arkansas; 5 parishes in Louisiana; 6 counties in Mississippi. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Mar 26, 2005, 9:18 PM CST (03:18 UTC)
Expired: Mar 26, 2005, 10:15 PM CST
In force: 57 min
Issued by: the Storm Prediction Center

All 21 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Chicot County, AR, Desha County, AR, Drew County, AR, Lee County, AR, Lincoln County, AR, Phillips County, AR, St. Francis County, AR, East Carroll Parish, LA, Franklin Parish, LA, Morehouse Parish, LA, Richland Parish, LA, West Carroll Parish, LA, Bolivar County, MS, Coahoma County, MS, Quitman County, MS, Sunflower County, MS, Tunica County, MS, Washington County, MS

The radar

The Little Rock radar (KLZK), 170 km from the middle of the area, began a volume at 03:19 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, 3.3 hours before the alert went out and 179 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 356 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1347 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.7

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.

Issued	Product	Office	Counties	Lasted
Mar 27, 12:52 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 15 more	113 min
Mar 27, 1:14 AM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, Livingston, Orleans, Saint Bernard and 7 more	91 min
Mar 27, 1:35 AM CST	Severe Thunderstorm Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 9 more	6 hr
Mar 27, 3:27 AM CST	Mesoscale Discussion	SPC	Washington	33 min
Mar 27, 3:48 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 8 more	87 min
Mar 27, 6:24 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 10 more	2 hr
Mar 26, 8:35 PM CST	Tornado Watch	SPC	Amite, Attala, Calhoun, Carroll, Chickasaw, Choctaw and 38 more	7 hr
Mar 26, 8:45 PM CST	Tornado Watch	SPC	Clarke, Forrest, George, Greene, Hancock, Harrison and 6 more	7 hr
Mar 26, 10:43 PM CST	Mesoscale Discussion	SPC	Clarke, Jasper, Lauderdale	62 min
Mar 26, 11:32 PM CST	Mesoscale Discussion	SPC	Attala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 31 more	58 min

Nearby

Mesoscale Discussions in Arkansas, 2005 Mesoscale Discussions in Mississippi, 2005 Mesoscale Discussions in Louisiana, 2005 Every mesoscale discussion in 2005

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.