Alert archive / Arkansas / Mesoscale Discussions in 2007

Mesoscale Discussion 353

March 27, 2007Bradley County, Union County, Arkansas; Claiborne Parish, Louisiana

The Storm Prediction Center issued this mesoscale discussion at Mar 27, 2007, 2:48 PM CDT for Bradley County, Union County, Arkansas; Claiborne Parish, Louisiana. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Mar 27, 2007, 2:48 PM CDT (19:48 UTC)
Expired: Mar 27, 2007, 4:15 PM CDT
In force: 87 min
Issued by: the Storm Prediction Center

Counties Bradley County, AR, Union County, AR, Claiborne Parish, LA

The radar

The Shreveport radar (KSHV), 134 km from the middle of the area, began a volume at 19:49 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

Shreveport, LA (KSHV), launched 12:00Z, 7.8 hours before the alert went out and 125 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 738 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 160 m²/s²
0-3 km storm-relative helicity: 147 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 27, 11:58 AM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Clark, Cleveland, Columbia and 9 more	2 hr
Mar 27, 12:35 PM CDT	Tornado Watch	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 15 more	9 hr
Mar 27, 4:25 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Chicot, Desha, Drew, Jefferson and 2 more	2 hr
Mar 27, 5:58 PM CDT	Severe Thunderstorm Watch	SPC	Ashley, Chicot, Desha	2 hr
Mar 27, 6:56 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 28 more	64 min

Nearby

Mesoscale Discussions in Arkansas, 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.