Alert archive / Texas / Mesoscale Discussions in 2008
Mesoscale Discussion 655
The Storm Prediction Center issued this mesoscale discussion at Apr 17, 2008, 8:13 PM CDT for 7 counties in Arkansas; Choctaw County, McCurtain County, Pushmataha County, Oklahoma; 36 counties in Texas. It was in force for 32 min.
The area
The outline as issued.
The facts
- Issued
- Apr 17, 2008, 8:13 PM CDT (01:13 UTC)
- Expired
- Apr 17, 2008, 8:45 PM CDT
- In force
- 32 min
- Issued by
- the Storm Prediction Center
All 46 counties
Hempstead County, AR, Howard County, AR, Little River County, AR, Miller County, AR, Pike County, AR, Polk County, AR, Sevier County, AR, Choctaw County, OK, McCurtain County, OK, Pushmataha County, OK, Anderson County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Delta County, TX, Falls County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Houston County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Navarro County, TX, Panola County, TX, Rains County, TX, Red River County, TX, Robertson County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Trinity County, TX, Upshur County, TX, Van Zandt County, TX, Walker County, TX, Wood County, TX
The radar
The Shreveport radar (KSHV), 127 km from the middle of the area, began a volume at 01:18 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
Fort Worth, TX (KFWD), launched 00:00Z, 1.2 hours before the alert went out and 204 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
- 822 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 1439 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 201 m²/s²
- 0-3 km storm-relative helicity
- 234 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 6.8
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 |
|---|---|---|---|---|
| Apr 18, 3:07 PM CDT | Mesoscale Discussion | SPC | Clay, Crittenden, Mississippi | 113 min |
| Apr 17, 8:57 PM CDT | Severe Thunderstorm Watch | SPC | Choctaw, McCurtain, Pushmataha | 7 hr |
| Apr 17, 11:55 PM CDT | Mesoscale Discussion | SPC | Choctaw, McCurtain, Pushmataha | 65 min |
| Apr 17, 7:06 PM CDT | Mesoscale Discussion | SPC | Collin, Cooke, Dallas, Denton, Grayson, Parker and 3 more | 54 min |
| Apr 17, 9:27 PM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 43 more | 63 min |
Nearby
Mesoscale Discussions in Texas, 2008Mesoscale Discussions in Arkansas, 2008Mesoscale Discussions in Oklahoma, 2008Every mesoscale discussion in 2008
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.