Alert archive / Oklahoma / Mesoscale Discussions in 2004
Mesoscale Discussion 391
The Storm Prediction Center issued this mesoscale discussion at Apr 20, 2004, 12:47 PM CDT for 10 counties in Kansas; 16 counties in Oklahoma. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- Apr 20, 2004, 12:47 PM CDT (17:47 UTC)
- Expired
- Apr 20, 2004, 2:15 PM CDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
All 26 counties
Chautauqua County, KS, Cherokee County, KS, Cowley County, KS, Elk County, KS, Labette County, KS, Montgomery County, KS, Neosho County, KS, Sumner County, KS, Wilson County, KS, Woodson County, KS, Craig County, OK, Creek County, OK, Delaware County, OK, Garfield County, OK, Kay County, OK, Mayes County, OK, Noble County, OK, Nowata County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Rogers County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK
The radar
The Tulsa radar (KINX), 100 km from the middle of the area, began a volume at 17:48 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
Lamont, OK (KLMN), launched 12:00Z, 5.8 hours before the alert went out and 113 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
- 5 J/kg
- Mixed-layer CIN
- -347 J/kg
- Mixed-layer LCL
- 913 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- 214 m²/s²
- 0-3 km storm-relative helicity
- 320 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 19, 9:00 PM CDT | Severe Thunderstorm Watch | SPC | Barber, Barton, Clark, Comanche, Edwards, Ellis and 28 more | 5 hr |
| Apr 19, 11:04 PM CDT | Mesoscale Discussion | SPC | Barber, Barton, Clark, Comanche, Edwards, Ellis and 28 more | 86 min |
| Apr 20, 2:05 PM CDT | Tornado Watch | SPC | Allen, Bourbon, Butler, Chautauqua, Cherokee, Cowley and 8 more | 6 hr |
| Apr 20, 5:16 PM CDT | Mesoscale Discussion | SPC | Allen, Bourbon, Butler, Chautauqua, Cherokee, Cowley and 8 more | 119 min |
| Apr 19, 7:53 PM CDT | Mesoscale Discussion | SPC | Beaver, Cimarron, Texas | 67 min |
| Apr 20, 5:46 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Coal, Garvin, Haskell and 13 more | 89 min |
Nearby
Mesoscale Discussions in Oklahoma, 2004Mesoscale Discussions in Kansas, 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.