Alert archive / Oklahoma / Mesoscale Discussions in 2004
Mesoscale Discussion 395
The Storm Prediction Center issued this mesoscale discussion at Apr 20, 2004, 5:46 PM CDT for 19 counties in Oklahoma; 5 counties in Texas. It was in force for 89 min.
The area
The outline as issued.
The facts
- Issued
- Apr 20, 2004, 5:46 PM CDT (22:46 UTC)
- Expired
- Apr 20, 2004, 7:15 PM CDT
- In force
- 89 min
- Issued by
- the Storm Prediction Center
All 24 counties
Atoka County, OK, Bryan County, OK, Carter County, OK, Coal County, OK, Garvin County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okfuskee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Sequoyah County, OK, Cooke County, TX, Denton County, TX, Grayson County, TX, Montague County, TX, Wise County, TX
The radar
The Norman radar (KTLX), 136 km from the middle of the area, began a volume at 22:49 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
Norman, OK (KOUN), launched 12:00Z, 10.8 hours before the alert went out and 132 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
- 58 J/kg
- Mixed-layer CIN
- -179 J/kg
- Mixed-layer LCL
- 706 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 396 m²/s²
- 0-3 km storm-relative helicity
- 420 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
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 |
|---|---|---|---|---|
| Apr 19, 7:53 PM CDT | Mesoscale Discussion | SPC | Beaver, Cimarron, Texas | 67 min |
| Apr 19, 9:00 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Beaver, Cimarron, Dewey, Ellis, Harper and 5 more | 5 hr |
| Apr 19, 11:04 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Cimarron, Dewey, Ellis, Harper and 5 more | 86 min |
| Apr 20, 12:47 PM CDT | Mesoscale Discussion | SPC | Craig, Creek, Delaware, Garfield, Kay, Mayes and 10 more | 88 min |
| Apr 20, 2:05 PM CDT | Tornado Watch | SPC | Adair, Cherokee, Craig, Creek, Delaware, Kay and 12 more | 6 hr |
| Apr 20, 5:16 PM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Craig, Creek, Delaware, Kay and 12 more | 119 min |
Nearby
Mesoscale Discussions in Oklahoma, 2004Mesoscale Discussions in Texas, 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.