Alert archive / Arkansas / Tornado Watches in 2011
Tornado Watch 335
The Storm Prediction Center issued this tornado watch at May 22, 2011, 8:47 PM CDT for 40 counties in Arkansas; Dunklin County, Pemiscot County, Missouri; 12 counties in Oklahoma. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- May 22, 2011, 8:47 PM CDT (01:47 UTC)
- Expired
- May 23, 2011, 4:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 70 kt
All 54 counties
Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Clay County, AR, Cleburne County, AR, Conway County, AR, Craighead County, AR, Crawford County, AR, Crittenden County, AR, Cross County, AR, Faulkner County, AR, Franklin County, AR, Fulton County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Johnson County, AR, Lawrence County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Mississippi County, AR, Newton County, AR, Perry County, AR, Poinsett County, AR, Pope County, AR, Randolph County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Dunklin County, MO, Pemiscot County, MO, Adair County, OK, Cherokee County, OK, Choctaw County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McIntosh County, OK, Muskogee County, OK, Pittsburg County, OK, Pushmataha County, OK, Sequoyah County, OK
The radar
The Little Rock radar (KLZK), 128 km from the middle of the area, began a volume at 01:50 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
- 60%
- One or more EF2 to EF5 tornadoes
- 30%
- Ten or more severe wind reports
- 70%
- One or more gusts of 65 knots or more
- 40%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 50%
- 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 22, 9:00 PM CDT | Severe Thunderstorm Warning | LZK | Boone | 30 min |
| May 22, 9:01 PM CDT | Severe Thunderstorm Warning | TSA | Pittsburg | 44 min |
| May 22, 9:14 PM CDT | Flash Flood Warning | LZK | Baxter, Boone, Marion | 3 hr |
| May 22, 9:15 PM CDT | Severe Thunderstorm Warning | TSA | Craig, Delaware, Mayes, Ottawa, Rogers | 60 min |
| May 22, 9:19 PM CDT | Flash Flood Warning | TSA | Benton, Carroll, Madison, Washington | 6 hr |
| May 22, 9:30 PM CDT | Severe Thunderstorm Warning | TSA | Carroll, Madison | 60 min |
| May 22, 9:38 PM CDT | Severe Thunderstorm Warning | TSA | Latimer, LeFlore, Pittsburg | 30 min |
| May 22, 10:01 PM CDT | Severe Thunderstorm Warning | LZK | Baxter, Marion | 29 min |
| May 22, 10:20 PM CDT | Severe Thunderstorm Warning | LZK | Logan, Scott, Yell | 26 min |
| May 22, 10:27 PM CDT | Severe Thunderstorm Warning | TSA | Benton, Carroll | 63 min |
| May 22, 10:33 PM CDT | Severe Thunderstorm Warning | TSA | Benton | 57 min |
| May 22, 10:37 PM CDT | Severe Thunderstorm Warning | LZK | Baxter, Izard, Marion, Searcy, Sharp, Stone | 53 min |
| May 22, 10:46 PM CDT | Tornado Warning | TSA | Benton | 44 min |
| May 22, 10:50 PM CDT | Severe Thunderstorm Warning | TSA | Crawford, Sebastian, Washington | 40 min |
| May 22, 10:55 PM CDT | Severe Thunderstorm Warning | TSA | Delaware | 35 min |
| May 22, 11:01 PM CDT | Severe Thunderstorm Warning | TSA | Crawford, Franklin, Sebastian | 59 min |
| May 22, 11:01 PM CDT | Tornado Warning | TSA | Benton | 29 min |
| May 22, 11:08 PM CDT | Severe Thunderstorm Warning | MEG | Clay, Greene, Lawrence, Randolph | 52 min |
| May 22, 11:10 PM CDT | Flash Flood Warning | TSA | Delaware | 6 hr |
| May 22, 11:12 PM CDT | Tornado Warning | TSA | Benton, Washington | 33 min |
| May 22, 11:24 PM CDT | Tornado Warning | TSA | Benton | 36 min |
| May 22, 11:36 PM CDT | Severe Thunderstorm Warning | TSA | Benton, Carroll, Madison, Washington | 39 min |
| May 22, 11:44 PM CDT | Severe Thunderstorm Warning | MEG | Clay, Greene, Lawrence, Randolph | 46 min |
| May 22, 11:45 PM CDT | Tornado Warning | TSA | Benton | 45 min |
| May 22, 11:49 PM CDT | Tornado Warning | MEG | Clay, Greene | 26 min |
| May 22, 11:52 PM CDT | Severe Thunderstorm Warning | LZK | Jackson, White, Woodruff | 23 min |
| May 22, 11:58 PM CDT | Severe Thunderstorm Warning | LZK | Independence, Jackson, Sharp, Stone | 47 min |
| May 23, 12:07 AM CDT | Severe Thunderstorm Warning | LZK | Monroe, Woodruff | 23 min |
| May 23, 12:11 AM CDT | Severe Thunderstorm Warning | LZK | Boone, Marion | 31 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, 1.8 hours before the alert went out and 140 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
- 3961 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 641 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 183 m²/s²
- 0-3 km storm-relative helicity
- 180 m²/s²
- Significant tornado parameter
- 3.7
- Supercell composite
- 15.9
The text
As transmitted, in the capitals the NWS used until 2016.
832
WWUS20 KWNS 230148
SEL5
SPC WW 230148
ARZ000-MOZ000-OKZ000-230900-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 335
NWS STORM PREDICTION CENTER NORMAN OK
850 PM CDT SUN MAY 22 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
NORTHERN ARKANSAS
THE SOUTHERN MISSOURI BOOTHEEL
EASTERN OKLAHOMA
EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 850 PM UNTIL
400 AM CDT.
TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 140 STATUTE
MILES EAST AND WEST OF A LINE FROM 50 MILES EAST NORTHEAST OF
FLIPPIN ARKANSAS TO 45 MILES EAST SOUTHEAST OF POTEAU OKLAHOMA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU5).
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 330. WATCH NUMBER 330 WILL NOT BE IN EFFECT AFTER
850 PM CDT. CONTINUE...WW 323...WW 325...WW 326...WW 327...WW
329...WW 332...WW 333...WW 334...
DISCUSSION...THUNDERSTORM CLUSTERS WITH EMBEDDED SUPERCELLS/BOWS
WILL PERSIST OVERNIGHT WHILE DEVELOPING ESEWD ALONG A RESIDUAL
OUTFLOW BOUNDARY ACROSS NRN AR. THE 00Z LZK SOUNDING REVEALED A
RELATIVELY MOIST AND STRONGLY SHEARED ENVIRONMENT THAT APPEARS TO BE
REPRESENTATIVE OF NRN AR...THUS A RISK FOR TORNADOES IS EXPECTED TO
PERSIST WITH SUPERCELLS AND BOW/BOUNDARY INTERACTIONS. DAMAGING
WINDS ARE ALSO LIKELY THE CELL MERGERS AND BOWING SEGMENTS...AS WELL
AS THE RISK FOR LARGE HAIL GIVEN A RESERVOIR OF STRONG INSTABILITY
ACROSS OK/AR IN ADVANCE OF THE STORMS.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 28035.
...THOMPSONSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 7:52 PM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Conway, Crawford and 13 more | 53 min |
| May 22, 11:46 PM CDT | Mesoscale Discussion | SPC | Clay, Cleburne, Conway, Craighead, Crawford, Cross and 23 more | 89 min |
| May 23, 5:07 AM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Crawford, Fulton and 10 more | 113 min |
| May 23, 7:38 AM CDT | Mesoscale Discussion | SPC | Benton, Carroll | 97 min |
| May 23, 9:14 AM CDT | Mesoscale Discussion | SPC | Clark, Cleburne, Conway, Crawford, Dallas, Faulkner and 26 more | 91 min |
| May 23, 9:57 AM CDT | Mesoscale Discussion | SPC | Lafayette, Little River, Miller | 33 min |
| May 23, 10:34 AM CDT | Mesoscale Discussion | SPC | Benton, Carroll, Fulton | 86 min |
| May 23, 12:10 PM CDT | Mesoscale Discussion | SPC | Lafayette, Miller | 65 min |
| May 23, 12:12 PM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Clay, Craighead and 13 more | 93 min |
| May 23, 1:16 PM CDT | Mesoscale Discussion | SPC | Baxter, Clay, Craighead, Fulton, Greene, Independence and 5 more | 89 min |
| May 23, 1:34 PM CDT | Severe Thunderstorm Watch | SPC | Clay, Cleburne, Conway, Craighead, Crittenden, Cross and 20 more | 6 hr |
| May 23, 3:58 PM CDT | Mesoscale Discussion | SPC | Clay, Cleburne, Conway, Craighead, Crittenden, Cross and 20 more | 92 min |
| May 23, 5:07 PM CDT | Mesoscale Discussion | SPC | Benton, Crawford, Washington | 23 min |
| May 23, 5:24 PM CDT | Tornado Watch | SPC | Crawford, Franklin, Sebastian, Washington | 4 hr |
| May 23, 6:18 PM CDT | Mesoscale Discussion | SPC | Cleburne, Craighead, Crittenden, Cross, Faulkner, Independence and 11 more | 87 min |
| May 22, 8:26 PM CDT | Tornado Watch | SPC | Barry, Bollinger, Butler, Cape Girardeau, Carter, Crawford and 33 more | 8 hr |
| May 22, 10:24 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Madison, Perry, Sainte Genevieve and 2 more | 66 min |
| May 23, 5:41 AM CDT | Mesoscale Discussion | SPC | Barton, Bates, Cedar, Dade, Hickory, Jasper and 5 more | 94 min |
| May 23, 6:08 AM CDT | Severe Thunderstorm Watch | SPC | Barry, Barton, Bates, Benton, Camden, Cass and 34 more | 7 hr |
| May 23, 10:55 AM CDT | Severe Thunderstorm Watch | SPC | Audrain, Bollinger, Boone, Butler, Callaway, Cape Girardeau and 28 more | 7 hr |
| May 23, 12:37 PM CDT | Mesoscale Discussion | SPC | City of Saint Louis | 83 min |
| May 22, 8:10 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 11 more | 65 min |
| May 23, 2:08 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 15 more | 97 min |
| May 23, 2:30 PM CDT | Tornado Watch | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 26 more | 8 hr |
| May 23, 6:51 PM CDT | Mesoscale Discussion | SPC | Blaine, Caddo, Canadian, Cleveland, Comanche, Cotton and 12 more | 84 min |
| May 23, 3:20 AM CDT | Mesoscale Discussion | SPC | Clay, Davidson, Fentress, Jackson, Macon, Overton and 9 more | 85 min |
| May 23, 4:24 PM CDT | Mesoscale Discussion | SPC | Bedford, Benton, Carroll, Cheatham, Chester, Davidson and 29 more | 96 min |
| May 23, 4:57 PM CDT | Severe Thunderstorm Watch | SPC | Bedford, Benton, Carroll, Cheatham, Chester, Davidson and 29 more | 4 hr |
Nearby
Tornado Watches in Arkansas, 2011Tornado Watches in Oklahoma, 2011Tornado Watches in Missouri, 2011Every tornado watch in 2011
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.