Alert archive / Arkansas / Mesoscale Discussions in 2011
Mesoscale Discussion 1901
The Storm Prediction Center issued this mesoscale discussion at Aug 8, 2011, 2:04 PM CDT for 35 counties in Arkansas; 11 counties in Oklahoma. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- Aug 8, 2011, 2:04 PM CDT (19:04 UTC)
- Expired
- Aug 8, 2011, 3:30 PM CDT
- In force
- 86 min
- Issued by
- the Storm Prediction Center
All 46 counties
Arkansas County, AR, Clark County, AR, Cleburne County, AR, Conway County, AR, Crawford County, AR, Cross County, AR, Dallas County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Jefferson County, AR, Johnson County, AR, Lee County, AR, Lincoln County, AR, Logan County, AR, Lonoke County, AR, Monroe County, AR, Montgomery County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Sebastian County, AR, St. Francis County, AR, Van Buren County, AR, Washington County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Adair County, OK, Cherokee County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McIntosh County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Sequoyah County, OK, Wagoner County, OK
The radar
The Western Arkansas radar (KSRX), 85 km from the middle of the area, began a volume at 19:03 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
Springfield, MO (KSGF), launched 12:00Z, 7.1 hours before the alert went out and 190 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
- 107 J/kg
- Mixed-layer CIN
- -274 J/kg
- Mixed-layer LCL
- 1571 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -115 m²/s²
- 0-3 km storm-relative helicity
- -24 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 |
|---|---|---|---|---|
| Aug 7, 8:27 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Carroll, Clay, Craighead, Fulton and 10 more | 2 hr |
| Aug 7, 9:18 PM CDT | Severe Thunderstorm Watch | SPC | Clay, Craighead, Greene, Mississippi, Randolph | 4 hr |
| Aug 7, 10:54 PM CDT | Mesoscale Discussion | SPC | Clay, Craighead, Fulton, Greene, Izard, Lawrence and 3 more | 96 min |
| Aug 7, 7:13 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Grant, Harper, Kay, Woods | 3 hr |
| Aug 8, 5:30 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 30 more | 2 hr |
| Aug 8, 6:01 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Craig and 29 more | 6 hr |
Nearby
Mesoscale Discussions in Arkansas, 2011Mesoscale Discussions in Oklahoma, 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.