Alert archive / Arkansas / Mesoscale Discussions in 2007
Mesoscale Discussion 351
The Storm Prediction Center issued this mesoscale discussion at Mar 27, 2007, 11:58 AM CDT for 15 counties in Arkansas; 13 parishes in Louisiana; Shelby County, Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 27, 2007, 11:58 AM CDT (16:58 UTC)
- Expired
- Mar 27, 2007, 2:00 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 29 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, Grant County, AR, Hot Spring County, AR, Jefferson County, AR, Lincoln County, AR, Nevada County, AR, Ouachita County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Shelby County, TX
The radar
The Shreveport radar (KSHV), 88 km from the middle of the area, began a volume at 17:00 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.
The nearest sounding before it
Shreveport, LA (KSHV), launched 12:00Z, 5.0 hours before the alert went out and 80 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.
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 27, 12:35 PM CDT | Tornado Watch | SPC | Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 15 more | 9 hr |
| Mar 27, 2:48 PM CDT | Mesoscale Discussion | SPC | Bradley, Union | 87 min |
| 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, 2007Mesoscale Discussions in Louisiana, 2007Mesoscale Discussions in Texas, 2007Every 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.