Alert archive / Arkansas / Mesoscale Discussions in 2009
Mesoscale Discussion 2109
The Storm Prediction Center issued this mesoscale discussion at Oct 15, 2009, 2:15 AM CDT for 4 states. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 15, 2009, 2:15 AM CDT (07:15 UTC)
- Expired
- Oct 15, 2009, 4:45 AM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 46 counties
Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Polk County, AR, Scott County, AR, Sevier County, AR, Union County, AR, Bossier Parish, LA, Claiborne Parish, LA, Webster Parish, LA, Atoka County, OK, Choctaw County, OK, Coal County, OK, Haskell County, OK, Hughes County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pittsburg County, OK, Pushmataha County, OK, Seminole County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Delta County, TX, Franklin County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Red River County, TX, Titus County, TX
The radar
The Western Arkansas radar (KSRX), 128 km from the middle of the area, began a volume at 07:14 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, 7.3 hours before the alert went out and 199 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
- 1186 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 493 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 179 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 4.3
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 |
|---|---|---|---|---|
| Oct 15, 5:39 AM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Columbia, Hempstead, Lafayette and 5 more | 3 hr |
| Oct 15, 7:08 AM CDT | Severe Thunderstorm Watch | SPC | Ashley, Columbia, Union | 9 hr |
| Oct 15, 10:23 AM CDT | Mesoscale Discussion | SPC | Bienville, Caldwell, Catahoula, Concordia, East Carroll, Franklin and 13 more | 67 min |
| Oct 15, 12:31 PM CDT | Mesoscale Discussion | SPC | Catahoula, Concordia, Franklin, Madison, Tensas | 29 min |
Nearby
Mesoscale Discussions in Arkansas, 2009Mesoscale Discussions in Oklahoma, 2009Mesoscale Discussions in Texas, 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.