Alert archive / Arkansas / Mesoscale Discussions in 2004
Mesoscale Discussion 422
The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2004, 8:12 PM CDT for 58 counties in Arkansas. It was in force for 63 min.
The area
The outline as issued.
The facts
- Issued
- Apr 21, 2004, 8:12 PM CDT (01:12 UTC)
- Expired
- Apr 21, 2004, 9:15 PM CDT
- In force
- 63 min
- Issued by
- the Storm Prediction Center
All 58 counties
Arkansas County, AR, Ashley County, AR, Baxter County, AR, Benton County, AR, Boone County, AR, Bradley County, AR, Calhoun County, AR, Carroll County, AR, Chicot County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Columbia County, AR, Conway County, AR, Crawford County, AR, Dallas County, AR, Drew County, AR, Faulkner County, AR, Franklin County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Independence County, AR, Izard County, AR, Jefferson County, AR, Johnson County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Logan County, AR, Lonoke County, AR, Madison County, AR, Marion County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Newton County, AR, Ouachita 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, Searcy County, AR, Sebastian County, AR, Sevier County, AR, Stone County, AR, Union County, AR, Van Buren County, AR, Washington County, AR, White County, AR, Yell County, AR
The radar
The Little Rock radar (KLZK), 92 km from the middle of the area, began a volume at 01:12 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
Springfield, MO (KSGF), launched 00:00Z, 1.2 hours before the alert went out and 210 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
- 91 J/kg
- Mixed-layer CIN
- -91 J/kg
- Mixed-layer LCL
- 1996 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 53 m²/s²
- 0-3 km storm-relative helicity
- 152 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 21, 7:01 PM CDT | Mesoscale Discussion | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 6 more | 119 min |
| Apr 21, 10:10 PM CDT | Mesoscale Discussion | SPC | Benton, Washington | 95 min |
| Apr 21, 10:50 PM CDT | Severe Thunderstorm Watch | SPC | Crawford, Sebastian | 5 hr |
| Apr 22, 1:43 AM CDT | Mesoscale Discussion | SPC | Crawford, Logan, Sebastian | 92 min |
| Apr 22, 12:32 PM CDT | Mesoscale Discussion | SPC | Benton, Washington | 88 min |
| Apr 22, 1:40 PM CDT | Tornado Watch | SPC | Benton, Boone, Carroll, Crawford, Franklin, Howard and 12 more | 6 hr |
| Apr 22, 3:26 PM CDT | Mesoscale Discussion | SPC | Crawford, Franklin, Johnson, Logan, Madison, Newton and 6 more | 64 min |
| Apr 22, 5:27 PM CDT | Mesoscale Discussion | SPC | Benton, Boone, Carroll, Crawford, Franklin, Howard and 12 more | 63 min |
| Apr 22, 6:23 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Crawford, Franklin, Howard, Johnson and 11 more | 67 min |
Nearby
Mesoscale Discussions in Arkansas, 2004Every mesoscale discussion in 2004
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.