Alert archive / Mississippi / Mesoscale Discussions in 2011
Mesoscale Discussion 279
The Storm Prediction Center issued this mesoscale discussion at Mar 26, 2011, 2:27 PM CDT for 14 counties in Arkansas; 8 parishes in Louisiana; 27 counties in Mississippi. It was in force for 63 min.
The area
The outline as issued.
The facts
- Issued
- Mar 26, 2011, 2:27 PM CDT (19:27 UTC)
- Expired
- Mar 26, 2011, 3:30 PM CDT
- In force
- 63 min
- Issued by
- the Storm Prediction Center
All 49 counties
Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Columbia County, AR, Desha County, AR, Drew County, AR, Hempstead County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Union County, AR, Bossier Parish, LA, Claiborne Parish, LA, East Carroll Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Attala County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Kemper County, MS, Leake County, MS, Leflore County, MS, Lowndes County, MS, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Sharkey County, MS, Sunflower County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yazoo County, MS
The radar
The Little Rock radar (KLZK), 172 km from the middle of the area, began a volume at 19:29 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
Jackson, MS (KJAN), launched 12:00Z, 7.5 hours before the alert went out and 214 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
- 1152 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 472 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 204 m²/s²
- 0-3 km storm-relative helicity
- 244 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 9.1
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 25, 7:31 PM CDT | Mesoscale Discussion | SPC | Calhoun, Clark, Columbia, Hempstead, Howard, Lafayette and 7 more | 89 min |
| Mar 25, 10:50 PM CDT | Severe Thunderstorm Watch | SPC | Columbia, Crawford, Franklin, Hempstead, Howard, Lafayette and 11 more | 7 hr |
| Mar 25, 11:40 PM CDT | Mesoscale Discussion | SPC | Crawford, Franklin, Madison, Newton, Washington | 65 min |
| Mar 26, 2:41 AM CDT | Mesoscale Discussion | SPC | Clark, Columbia, Hempstead, Howard, Lafayette, Little River and 6 more | 2 hr |
| Mar 26, 3:27 PM CDT | Tornado Watch | SPC | Ashley, Bradley, Calhoun, Chicot, Desha, Drew and 2 more | 7 hr |
| Mar 26, 4:33 PM CDT | Mesoscale Discussion | SPC | Columbia, Lafayette, Miller | 57 min |
| Mar 26, 10:21 AM CDT | Mesoscale Discussion | SPC | Calhoun, Chickasaw, Choctaw, Clay, Lowndes, Monroe and 3 more | 54 min |
| Mar 26, 11:25 AM CDT | Mesoscale Discussion | SPC | Clay, Kemper, Lauderdale, Lowndes, Monroe, Neshoba and 4 more | 95 min |
Nearby
Mesoscale Discussions in Mississippi, 2011Mesoscale Discussions in Arkansas, 2011Mesoscale Discussions in Louisiana, 2011Every mesoscale discussion in 2011
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.