Alert archive / Arkansas / Mesoscale Discussions in 2008

Mesoscale Discussion 467

March 18, 20085 states

The Storm Prediction Center issued this mesoscale discussion at Mar 18, 2008, 8:43 PM CDT for 5 states. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Mar 18, 2008, 8:43 PM CDT (01:43 UTC)
Expired: Mar 18, 2008, 10:15 PM CDT
In force: 92 min
Issued by: the Storm Prediction Center

All 54 counties

Clark County, AR, Cleveland County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Jefferson County, AR, Lafayette County, AR, Lee County, AR, Lonoke County, AR, Miller County, AR, Mississippi County, AR, Monroe County, AR, Nevada County, AR, Ouachita County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Caldwell County, KY, Calloway County, KY, Christian County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Lyon County, KY, Marshall County, KY, Trigg County, KY, Pemiscot County, MO, Carroll County, TN, Crockett County, TN, Dyer County, TN, Gibson County, TN, Haywood County, TN, Henry County, TN, Houston County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Shelby County, TN, Stewart County, TN, Tipton County, TN, Weakley County, TN, Cass County, TX, Gregg County, TX, Marion County, TX, Morris County, TX, Upshur County, TX

The radar

The Little Rock radar (KLZK), 84 km from the middle of the area, began a volume at 01:44 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, 1.7 hours before the alert went out and 291 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: 4 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 1138 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 301 m²/s²
0-3 km storm-relative helicity: 322 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.

Issued	Product	Office	Counties	Lasted
Mar 18, 10:34 PM CDT	Mesoscale Discussion	SPC	Ashley, Chicot, Union	56 min
Mar 18, 10:51 PM CDT	Tornado Watch	SPC	Ashley, Chicot	8 hr
Mar 18, 11:42 PM CDT	Mesoscale Discussion	SPC	Crittenden, St. Francis	63 min
Mar 19, 1:13 AM CDT	Mesoscale Discussion	SPC	Allen, Barren, Bullitt, Butler, Calloway, Christian and 18 more	62 min
Mar 19, 1:32 PM CDT	Mesoscale Discussion	SPC	Bell, Breathitt, Clay, Floyd, Harlan, Jackson and 19 more	58 min
Mar 19, 2:03 PM CDT	Tornado Watch	SPC	Bell, Breathitt, Clay, Estill, Floyd, Harlan and 19 more	5 hr
Mar 19, 3:54 PM CDT	Mesoscale Discussion	SPC	Bell, Boyd, Breathitt, Clay, Elliott, Floyd and 14 more	66 min
Mar 19, 4:55 AM CDT	Mesoscale Discussion	SPC	Giles	2 hr
Mar 19, 7:08 AM CDT	Mesoscale Discussion	SPC	Bedford, Franklin, Giles, Hardin, Lawrence, Lewis and 7 more	2 hr
Mar 19, 4:43 PM CDT	Severe Thunderstorm Watch	SPC	Blount, Carter, Cocke, Greene, Hamblen, Hawkins and 8 more	4 hr
Mar 19, 6:19 PM CDT	Mesoscale Discussion	SPC	Blount, Carter, Cocke, Greene, Hamblen, Hawkins and 8 more	86 min

Nearby

Mesoscale Discussions in Arkansas, 2008 Mesoscale Discussions in Tennessee, 2008 Mesoscale Discussions in Kentucky, 2008 Every mesoscale discussion in 2008

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.