Alert archive / Arkansas / Mesoscale Discussions in 2004
Mesoscale Discussion 207
The Storm Prediction Center issued this mesoscale discussion at Mar 20, 2004, 3:38 PM CST for 34 counties in Arkansas; 5 counties in Oklahoma. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 20, 2004, 3:38 PM CST (21:38 UTC)
- Expired
- Mar 20, 2004, 5:45 PM CST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 39 counties
Arkansas County, AR, Clark County, AR, Cleburne County, AR, Conway County, AR, Crawford County, AR, Dallas County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Howard County, AR, Independence County, AR, Jefferson County, AR, Johnson 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, Sevier County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Choctaw County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK
The radar
The Western Arkansas radar (KSRX), 83 km from the middle of the area, began a volume at 21:41 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, 9.6 hours before the alert went out and 238 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
- 1599 J/kg
- Mixed-layer CIN
- -111 J/kg
- Mixed-layer LCL
- 617 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 266 m²/s²
- 0-3 km storm-relative helicity
- 405 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 9.9
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 20, 11:50 AM CST | Severe Thunderstorm Watch | SPC | Craighead, Crittenden, Cross, Greene, Lawrence, Lee and 3 more | 6 hr |
| Mar 20, 2:09 PM CST | Mesoscale Discussion | SPC | Craighead, Mississippi | 66 min |
| Mar 20, 5:05 PM CST | Mesoscale Discussion | SPC | Clark, Conway, Faulkner, Garland, Hempstead, Hot Spring and 11 more | 85 min |
| Mar 20, 5:10 PM CST | Mesoscale Discussion | SPC | Crittenden, Cross, Mississippi, Poinsett, St. Francis | 65 min |
| Mar 20, 2:05 PM CST | Mesoscale Discussion | SPC | Bryan, Carter, Jefferson, Love, Marshall | 2 hr |
Nearby
Mesoscale Discussions in Arkansas, 2004Mesoscale Discussions in Oklahoma, 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.