Alert archive / Arkansas / Tornado Watches in 2006
Tornado Watch 320
The Storm Prediction Center issued this tornado watch at May 9, 2006, 5:07 PM CDT for 16 counties in Arkansas; 8 counties in Missouri; 11 counties in Oklahoma. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 9, 2006, 5:07 PM CDT (22:07 UTC)
- Expired
- May 9, 2006, 10:55 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 60 kt
All 35 counties
Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Fulton County, AR, Izard County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Searcy County, AR, Sebastian County, AR, Sharp County, AR, Stone County, AR, Washington County, AR, Barry County, MO, Howell County, MO, McDonald County, MO, Oregon County, MO, Ozark County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Adair County, OK, Cherokee County, OK, Creek County, OK, Delaware County, OK, Mayes County, OK, Muskogee County, OK, Okmulgee County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK
The radar
The Western Arkansas radar (KSRX), 94 km from the middle of the area, began a volume at 22:07 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 50%
- One or more EF2 to EF5 tornadoes
- 30%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 40%
- Ten or more severe hail reports
- 80%
- One or more hailstones of 2 inches or more
- 60%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
29 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 5:19 PM CDT | Severe Thunderstorm Warning | SGF | Ozark | 56 min |
| May 9, 5:32 PM CDT | Severe Thunderstorm Warning | TSA | Cherokee, Muskogee | 58 min |
| May 9, 6:11 PM CDT | Severe Thunderstorm Warning | SGF | Ozark | 49 min |
| May 9, 6:15 PM CDT | Flash Flood Warning | SGF | Ozark | 5 hr |
| May 9, 6:15 PM CDT | Flash Flood Warning | SGF | Ozark | 17 hr |
| May 9, 6:21 PM CDT | Severe Thunderstorm Warning | TSA | Sequoyah | 54 min |
| May 9, 6:24 PM CDT | Severe Thunderstorm Warning | TSA | Cherokee | 53 min |
| May 9, 6:33 PM CDT | Tornado Warning | TSA | Sequoyah | 42 min |
| May 9, 6:34 PM CDT | Tornado Warning | SGF | Ozark | 41 min |
| May 9, 6:43 PM CDT | Tornado Warning | SGF | Howell | 47 min |
| May 9, 7:07 PM CDT | Flash Flood Warning | SGF | Howell | 6 hr |
| May 9, 7:10 PM CDT | Severe Thunderstorm Warning | TSA | Okmulgee | 65 min |
| May 9, 7:14 PM CDT | Tornado Warning | TSA | Sequoyah | 61 min |
| May 9, 7:17 PM CDT | Severe Thunderstorm Warning | LZK | Fulton | 58 min |
| May 9, 7:27 PM CDT | Tornado Warning | SGF | Howell | 18 min |
| May 9, 7:46 PM CDT | Severe Thunderstorm Warning | SGF | Howell, Oregon | 23 min |
| May 9, 7:54 PM CDT | Tornado Warning | TSA | Sebastian | 66 min |
| May 9, 7:58 PM CDT | Severe Thunderstorm Warning | TSA | Muskogee | 31 min |
| May 9, 8:12 PM CDT | Tornado Warning | TSA | Sequoyah | 33 min |
| May 9, 8:14 PM CDT | Severe Thunderstorm Warning | LZK | Fulton | 61 min |
| May 9, 8:53 PM CDT | Tornado Warning | TSA | Sebastian | 57 min |
| May 9, 8:56 PM CDT | Severe Thunderstorm Warning | TSA | Muskogee | 19 min |
| May 9, 8:58 PM CDT | Severe Thunderstorm Warning | TSA | Haskell, Sequoyah | 62 min |
| May 9, 9:26 PM CDT | Flash Flood Warning | TSA | Sebastian | 3 hr |
| May 9, 9:46 PM CDT | Flash Flood Warning | TSA | Franklin | 119 min |
| May 9, 9:53 PM CDT | Severe Thunderstorm Warning | TSA | Franklin | 32 min |
| May 9, 9:53 PM CDT | Flash Flood Warning | TSA | Sequoyah | 67 min |
| May 9, 10:14 PM CDT | Severe Thunderstorm Warning | TSA | Mayes, Wagoner | 76 min |
| May 9, 10:18 PM CDT | Flash Flood Warning | SGF | Douglas, Ozark | 12 hr |
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 12:00Z, 10.1 hours before the alert went out and 105 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
- 572 J/kg
- Mixed-layer CIN
- -109 J/kg
- Mixed-layer LCL
- 735 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 195 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 092206
SEL0
SPC WW 092206
ARZ000-MOZ000-OKZ000-100400-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 320
NWS STORM PREDICTION CENTER NORMAN OK
510 PM CDT TUE MAY 9 2006
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
NORTHERN ARKANSAS
SOUTHERN MISSOURI
NORTHEAST OKLAHOMA
EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 510 PM UNTIL
1100 PM CDT.
TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 40 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 55 MILES SOUTHWEST OF TULSA
OKLAHOMA TO 30 MILES EAST SOUTHEAST OF WEST PLAINS MISSOURI. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU0).
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...CONTINUE...WW 317...WW 318...WW 319...
DISCUSSION...THUNDERSTORMS ARE EXPECTED TO INCREASE IN AREAL
COVERAGE THIS EVENING ALONG SURFACE BOUNDARY EXTENDING FROM
NORTHEAST OK INTO SOUTHERN MO. AIRMASS ALONG AND SOUTH OF FRONT IS
VERY UNSTABLE WILL MUCAPE VALUES OVER 3000 J/KG AND FAVORABLE
VERTICAL SHEAR. BEST THREAT OF TORNADOES APPEARS TO BE IMMEDIATELY
NORTH OF REMNANT BOUNDARY ACROSS EAST CENTRAL OK AND NORTHWEST
AR...WHERE BACKED LOW LEVEL WINDS AND STRONGEST INSTABILITY ARE
PRESENT.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 27030.
...HARTSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 4:24 AM CDT | Severe Thunderstorm Watch | SPC | Benton, Carroll, Madison, Washington | 4 hr |
| May 9, 6:22 AM CDT | Severe Thunderstorm Watch | SPC | Baxter, Boone, Fulton, Independence, Izard, Marion and 4 more | 6 hr |
| May 9, 10:00 AM CDT | Mesoscale Discussion | SPC | Clay, Craighead, Crittenden, Greene, Jackson, Lawrence and 4 more | 2 hr |
| May 9, 10:05 AM CDT | Severe Thunderstorm Watch | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 4 more | 5 hr |
| May 9, 10:46 AM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Clark, Cleburne, Cleveland, Conway, Dallas and 17 more | 4 hr |
| May 9, 4:46 PM CDT | Mesoscale Discussion | SPC | Benton, Boone, Carroll, Madison, Washington | 89 min |
| May 9, 6:30 PM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Crawford, Franklin and 6 more | 90 min |
| May 8, 7:47 PM CDT | Mesoscale Discussion | SPC | Atchison, Holt, Nodaway | 58 min |
| May 8, 10:59 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Buchanan, Gentry, Holt, Nodaway and 1 more | 91 min |
| May 9, 1:13 AM CDT | Mesoscale Discussion | SPC | Alfalfa, Craig, Grant, Kay, Mayes, Noble and 6 more | 92 min |
| May 9, 3:45 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Cleveland, Coal and 24 more | 2 hr |
| May 9, 4:04 PM CDT | Tornado Watch | SPC | Atoka, Bryan, Choctaw, Coal, Haskell, Hughes and 12 more | 7 hr |
| May 9, 4:56 PM CDT | Mesoscale Discussion | SPC | Beaver, Beckham, Custer, Dewey, Ellis, Harper and 5 more | 2 hr |
| May 9, 6:01 PM CDT | Severe Thunderstorm Watch | SPC | Beaver, Beckham, Custer, Dewey, Ellis, Greer and 8 more | 7 hr |
Nearby
Tornado Watches in Arkansas, 2006Tornado Watches in Oklahoma, 2006Tornado Watches in Missouri, 2006Every tornado watch in 2006
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.