Alert archive / Arkansas / Mesoscale Discussions in 2007

Mesoscale Discussion 1201

June 19, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2007, 3:41 PM CDT for 4 states. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Jun 19, 2007, 3:41 PM CDT (20:41 UTC)
Expired: Jun 19, 2007, 4:45 PM CDT
In force: 64 min
Issued by: the Storm Prediction Center

All 32 counties

Ashley County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Drew County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Polk County, AR, Scott County, AR, Sevier County, AR, Union County, AR, Morehouse Parish, LA, Union Parish, LA, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK, Bowie County, TX

The radar

The Little Rock radar (KLZK), 157 km from the middle of the area, began a volume at 20:42 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.

Severe Thunderstorm Watch 423Jun 19, 4:55 PM CDT

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 8.7 hours before the alert went out and 154 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: 2856 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 527 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 61 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
Jun 19, 10:17 AM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Chicot, Desha, Drew, Lee and 4 more	28 min
Jun 19, 10:39 AM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Ashley, Chicot, Desha, Drew, Lincoln	6 hr
Jun 19, 12:55 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Chicot, Desha, Drew, Lincoln	65 min
Jun 19, 3:07 PM CDT	Mesoscale Discussion	SPC	Ashley, Chicot	53 min
Jun 19, 3:21 PM CDT	Severe Thunderstorm Watch	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 16 more	6 hr
Jun 19, 3:31 PM CDT	Mesoscale Discussion	SPC	Cimarron, Texas	89 min
Jun 19, 4:37 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Creek, Garfield, Grant, Harper and 16 more	23 min
Jun 19, 4:52 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 38 more	7 hr
Jun 19, 5:22 PM CDT	Severe Thunderstorm Watch	SPC	Beaver, Cimarron, Texas	9 hr

Nearby

Mesoscale Discussions in Arkansas, 2007 Mesoscale Discussions in Oklahoma, 2007 Mesoscale Discussions in Louisiana, 2007 Every mesoscale discussion in 2007

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.