Alert archive / Arkansas / Mesoscale Discussions in 2009
Mesoscale Discussion 284
The Storm Prediction Center issued this mesoscale discussion at Mar 26, 2009, 9:28 PM CDT for 5 counties in Arkansas; 4 counties in Oklahoma. It was in force for 62 min.
The area
The outline as issued.
The facts
- Issued
- Mar 26, 2009, 9:28 PM CDT (02:28 UTC)
- Expired
- Mar 26, 2009, 10:30 PM CDT
- In force
- 62 min
- Issued by
- the Storm Prediction Center
Counties Howard County, AR, Montgomery County, AR, Polk County, AR, Scott County, AR, Sevier County, AR, Choctaw County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK
The radar
The Western Arkansas radar (KSRX), 115 km from the middle of the area, began a volume at 02:31 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 00:00Z, 2.5 hours before the alert went out and 211 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
- 936 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 949 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 219 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 5.5
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, 12:33 PM CDT | Mesoscale Discussion | SPC | Hempstead, Howard, Lafayette, Little River, Miller, Sevier | 57 min |
| Mar 27, 12:58 PM CDT | Tornado Watch | SPC | Howard, Little River, Miller, Sevier | 7 hr |
| Mar 27, 3:34 PM CDT | Mesoscale Discussion | SPC | Howard, Little River, Miller, Sevier | 56 min |
| Mar 27, 5:53 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Clark, Cleveland and 16 more | 97 min |
| Mar 27, 6:35 PM CDT | Tornado Watch | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 27 more | 7 hr |
| Mar 26, 7:32 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Carter, Coal, Jefferson, Johnston and 3 more | 4 hr |
| Mar 26, 11:34 PM CDT | Mesoscale Discussion | SPC | Cimarron, Texas | 4 hr |
| Mar 27, 2:55 AM CDT | Mesoscale Discussion | SPC | Beaver, Cimarron, Texas | 4 hr |
| Mar 27, 6:50 AM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Canadian, Creek, Dewey, Garfield and 14 more | 85 min |
| Mar 27, 8:04 AM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Beckham, Custer, Dewey, Ellis and 7 more | 4 hr |
| Mar 27, 12:30 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 19 more | 6 hr |
Nearby
Mesoscale Discussions in Arkansas, 2009Mesoscale Discussions in Oklahoma, 2009Every mesoscale discussion in 2009
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.