Alert archive / Oklahoma / Mesoscale Discussions in 2004
Mesoscale Discussion 434
The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2004, 5:27 PM CDT for 4 states. It was in force for 63 min.
The area
The outline as issued.
The facts
- Issued
- Apr 22, 2004, 5:27 PM CDT (22:27 UTC)
- Expired
- Apr 22, 2004, 6:30 PM CDT
- In force
- 63 min
- Issued by
- the Storm Prediction Center
All 60 counties
Benton County, AR, Boone County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Howard County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Montgomery County, AR, Newton County, AR, Pike County, AR, Polk County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Washington County, AR, Yell County, AR, Barry County, MO, Stone County, MO, Taney County, MO, Adair County, OK, Atoka County, OK, Bryan County, OK, Choctaw County, OK, Coal County, OK, Craig County, OK, Creek County, OK, Garvin County, OK, Haskell County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Love County, OK, Marshall County, OK, McCurtain County, OK, Murray County, OK, Okfuskee County, OK, Okmulgee County, OK, Ottawa County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Tulsa County, OK, Collin County, TX, Cooke County, TX, Delta County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Hunt County, TX, Lamar County, TX, Montague County, TX, Red River County, TX
The radar
The Norman radar (KTLX), 128 km from the middle of the area, began a volume at 22:30 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, 10.5 hours before the alert went out and 135 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
- 900 J/kg
- Mixed-layer CIN
- -89 J/kg
- Mixed-layer LCL
- 473 m above ground
- 0-6 km bulk shear
- 78 kt
- 0-1 km storm-relative helicity
- 232 m²/s²
- 0-3 km storm-relative helicity
- 312 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.3
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 21, 7:01 PM CDT | Mesoscale Discussion | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 6 more | 119 min |
| Apr 21, 8:12 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Baxter, Benton, Boone, Bradley and 52 more | 63 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, 6:23 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Crawford, Franklin, Howard, Johnson and 11 more | 67 min |
| Apr 21, 7:06 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Blaine, Dewey, Ellis, Harper and 3 more | 2 hr |
| Apr 21, 7:51 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Choctaw, Cleveland, Creek, Delaware and 18 more | 84 min |
| Apr 21, 8:35 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Blaine, Dewey, Ellis, Garfield, Grant and 9 more | 5 hr |
| Apr 21, 8:35 PM CDT | Tornado Watch | SPC | Atoka, Bryan, Choctaw, Coal, Haskell, Hughes and 6 more | 5 hr |
| Apr 21, 10:26 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Choctaw, Coal, Haskell, Hughes and 7 more | 64 min |
| Apr 21, 10:56 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Garfield, Grant, Kay, Kingfisher, Logan and 2 more | 94 min |
| Apr 22, 4:30 PM CDT | Tornado Watch | SPC | Bryan, Love | 6 hr |
| Apr 22, 3:15 PM CDT | Mesoscale Discussion | SPC | Collin, Cooke, Dallas, Denton, Fannin, Grayson and 8 more | 3 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2004Mesoscale Discussions in Arkansas, 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.