Alert archive / Oklahoma / Tornado Watches in 2004
Tornado Watch 97
The Storm Prediction Center issued this tornado watch at Apr 20, 2004, 7:50 PM CDT for 5 counties in Arkansas; 4 counties in Missouri; 19 counties in Oklahoma. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 20, 2004, 7:50 PM CDT (00:50 UTC)
- Expired
- Apr 21, 2004, 1:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 28 counties
Benton County, AR, Carroll County, AR, Crawford County, AR, Madison County, AR, Washington County, AR, Barry County, MO, McDonald County, MO, Stone County, MO, Taney County, MO, Adair County, OK, Cherokee County, OK, Cleveland County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Haskell County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Ottawa County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK
The radar
The Tulsa radar (KINX), 38 km from the middle of the area, began a volume at 00:51 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.
Warnings issued inside it
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 7:52 PM CDT | Severe Thunderstorm Warning | TSA | Rogers | 23 min |
| Apr 20, 8:03 PM CDT | Severe Thunderstorm Warning | TSA | Okmulgee | 57 min |
| Apr 20, 8:15 PM CDT | Tornado Warning | TSA | Craig, Ottawa | 45 min |
| Apr 20, 8:19 PM CDT | Severe Thunderstorm Warning | TSA | Mayes, Rogers | 41 min |
| Apr 20, 8:25 PM CDT | Tornado Warning | TSA | Wagoner | 50 min |
| Apr 20, 8:28 PM CDT | Tornado Warning | TSA | Okmulgee | 47 min |
| Apr 20, 8:43 PM CDT | Severe Thunderstorm Warning | TSA | Mayes | 47 min |
| Apr 20, 8:44 PM CDT | Severe Thunderstorm Warning | TSA | Creek | 46 min |
| Apr 20, 8:51 PM CDT | Severe Thunderstorm Warning | TSA | Ottawa | 39 min |
| Apr 20, 9:02 PM CDT | Tornado Warning | TSA | Muskogee | 43 min |
| Apr 20, 9:08 PM CDT | Severe Thunderstorm Warning | TSA | Okfuskee | 37 min |
| Apr 20, 9:13 PM CDT | Severe Thunderstorm Warning | TSA | Cherokee, Wagoner | 47 min |
| Apr 20, 9:21 PM CDT | Tornado Warning | TSA | Okfuskee | 24 min |
| Apr 20, 9:29 PM CDT | Tornado Warning | TSA | Okmulgee | 46 min |
| Apr 20, 9:31 PM CDT | Severe Thunderstorm Warning | TSA | Creek | 44 min |
| Apr 20, 9:41 PM CDT | Severe Thunderstorm Warning | TSA | Delaware | 49 min |
| Apr 20, 9:44 PM CDT | Severe Thunderstorm Warning | TSA | Muskogee | 46 min |
| Apr 20, 10:22 PM CDT | Severe Thunderstorm Warning | TSA | Cherokee | 38 min |
| Apr 20, 10:24 PM CDT | Severe Thunderstorm Warning | TSA | McIntosh | 51 min |
| Apr 20, 10:52 PM CDT | Severe Thunderstorm Warning | TSA | McIntosh, Okfuskee, Okmulgee | 38 min |
| Apr 20, 11:08 PM CDT | Severe Thunderstorm Warning | TSA | Madison, Washington | 52 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Springfield, MO (KSGF), launched 00:00Z, 0.8 hours before the alert went out and 185 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
- 40 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 860 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 147 m²/s²
- 0-3 km storm-relative helicity
- 176 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
097
WWUS20 KWNS 210047
SEL7
SPC WW 210050
ARZ000-MOZ000-OKZ000-210600-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 97
NWS STORM PREDICTION CENTER NORMAN OK
750 PM CDT TUE APR 20 2004
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
NORTHWEST ARKANSAS
SOUTHWEST CORNER OF MISSOURI
EASTERN OKLAHOMA
EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 750 PM
UNTIL 100 AM CDT.
TORNADOES...HAIL TO 4 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 80 STATUTE MILES EAST AND WEST
OF A LINE FROM 50 MILES SOUTHWEST OF MUSKOGEE OKLAHOMA TO 5 MILES
EAST NORTHEAST OF MONETT MISSOURI.
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.
OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 93. WATCH NUMBER 93 WILL NOT BE IN EFFECT AFTER 750
PM CDT. CONTINUE...WW 94...WW 95...WW 96...
DISCUSSION...TORNADIC SUPERCELLS NERN OK EXPECTED TO PERSIST THRU
THE EVENING AS SHEAR PROFILES AND INSTABILITY WILL REMAIN STRONG E
OF DRY LINE. STORMS WILL LIKELY DEVELOP/MOVE S OF E INTO NWRN AR.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550.
MEAN STORM MOTION VECTOR 24025.
...HALES
350,0972 365,0951 365,0922 350,0943SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 7:22 PM CDT | Mesoscale Discussion | SPC | Benton, Madison, Washington | 23 min |
| Apr 20, 8:57 PM CDT | Mesoscale Discussion | SPC | Benton, Carroll, Crawford, Madison, Washington | 2 hr |
| Apr 20, 10:39 PM CDT | Mesoscale Discussion | SPC | Crawford, Franklin, Scott, Sebastian | 3 hr |
| Apr 20, 10:57 PM CDT | Mesoscale Discussion | SPC | Benton, Carroll, Crawford, Madison, Washington | 93 min |
| Apr 21, 2:13 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Clark, Cleburne, Cleveland, Conway and 30 more | 92 min |
| Apr 21, 2:40 PM CDT | Tornado Watch | SPC | Arkansas, Ashley, Baxter, Benton, Boone, Bradley and 52 more | 6 hr |
| Apr 21, 4:40 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Baxter, Benton, Boone, Bradley and 52 more | 95 min |
| Apr 21, 6:29 PM CDT | Mesoscale Discussion | SPC | Arkansas, Baxter, Benton, Boone, Carroll, Chicot and 25 more | 91 min |
| Apr 20, 7:20 PM CDT | Mesoscale Discussion | SPC | Adair, Audrain, Bates, Benton, Boone, Caldwell and 38 more | 115 min |
| Apr 20, 8:06 PM CDT | Mesoscale Discussion | SPC | Atchison | 84 min |
| Apr 20, 9:38 PM CDT | Mesoscale Discussion | SPC | Audrain, Boone, Callaway, Cole, Crawford, Dent and 16 more | 37 min |
| Apr 20, 11:10 PM CDT | Mesoscale Discussion | SPC | Crawford, Dent, Franklin, Gasconade, Iron, Jefferson and 9 more | 2 hr |
| Apr 21, 2:58 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Mississippi, New Madrid, Pemiscot and 4 more | 92 min |
| Apr 21, 12:58 PM CDT | Mesoscale Discussion | SPC | Atoka, Beckham, Blaine, Bryan, Caddo, Canadian and 34 more | 2 hr |
| Apr 21, 1:50 PM CDT | Tornado Watch | SPC | Adair, Alfalfa, Atoka, Beckham, Blaine, Caddo and 55 more | 7 hr |
| Apr 21, 1:56 PM CDT | Mesoscale Discussion | SPC | Beaver, Cimarron, Texas | 94 min |
| Apr 21, 3:00 PM CDT | Severe Thunderstorm Watch | SPC | Beaver, Cimarron, Texas | 6 hr |
| Apr 21, 4:39 PM CDT | Mesoscale Discussion | SPC | Adair, Alfalfa, Atoka, Beckham, Blaine, Caddo and 47 more | 66 min |
| Apr 21, 5:09 PM CDT | Mesoscale Discussion | SPC | Beaver, Cimarron, Texas | 66 min |
| Apr 21, 6:02 PM CDT | Mesoscale Discussion | SPC | Adair, Alfalfa, Atoka, Blaine, Canadian, Cherokee and 43 more | 88 min |
Nearby
Tornado Watches in Oklahoma, 2004Tornado Watches in Arkansas, 2004Tornado Watches in Missouri, 2004Every tornado watch 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.