Alert archive / Oklahoma / Tornado Watches in 2016

Tornado Watch 155

May 9, 201611 counties in Arkansas; 34 counties in Oklahoma; 7 counties in Texas

The Storm Prediction Center issued this tornado watch at May 9, 2016, 2:36 PM CDT for 11 counties in Arkansas; 34 counties in Oklahoma; 7 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
May 9, 2016, 2:36 PM CDT (19:36 UTC)
Expired
May 9, 2016, 9:46 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
60 kt
All 52 counties

Crawford County, AR, Hempstead County, AR, Howard County, AR, Little River County, AR, Miller County, AR, Montgomery County, AR, Pike County, AR, Polk County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Cleveland County, OK, Coal 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, Lincoln County, OK, Love County, OK, Marshall County, OK, McClain County, OK, McCurtain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Seminole County, OK, Sequoyah County, OK, Stephens County, OK, Tulsa County, OK, Bowie County, TX, Cooke County, TX, Delta County, TX, Fannin County, TX, Grayson County, TX, Lamar County, TX, Red River County, TX

The radar

The Western Arkansas radar (KSRX), 174 km from the middle of the area, began a volume at 19:39 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
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
70%
One or more hailstones of 2 inches or more
50%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

59 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 9, 3:37 PM CDTSevere Thunderstorm WarningOUNGarvin, Murray38 min
May 9, 3:55 PM CDTSevere Thunderstorm WarningOUNLove, Marshall65 min
May 9, 4:05 PM CDTTornado WarningOUNGarvin, Murray25 min
May 9, 4:27 PM CDTTornado Warning Tornado observedConsiderable damage threatOUNGarvin, Murray33 min
May 9, 4:31 PM CDTSevere Thunderstorm WarningOUNCleveland, Lincoln, Oklahoma, Pottawatomie44 min
May 9, 4:40 PM CDTTornado WarningOUNCleveland, Pottawatomie50 min
May 9, 4:52 PM CDTTornado Warning EmergencyTornado observedConsiderable damage threatOUNGarvin, Murray, Pontotoc23 min
May 9, 5:00 PM CDTSevere Thunderstorm WarningOUNAtoka, Bryan, Marshall45 min
May 9, 5:10 PM CDTTornado WarningOUNBryan, Marshall35 min
May 9, 5:12 PM CDTTornado Warning EmergencyTornado observedCatastrophic damage threatOUNMurray, Pontotoc33 min
May 9, 5:18 PM CDTSevere Thunderstorm WarningOUNLincoln, Logan, Payne57 min
May 9, 5:19 PM CDTTornado WarningOUNAtoka, Coal, Johnston26 min
May 9, 5:23 PM CDTTornado Warning Tornado observedOUNCleveland, Pottawatomie37 min
May 9, 5:34 PM CDTTornado WarningOUNBryan26 min
May 9, 5:41 PM CDTTornado WarningOUNAtoka, Coal34 min
May 9, 5:42 PM CDTSevere Thunderstorm WarningOUNCoal, Hughes, Pontotoc48 min
May 9, 5:52 PM CDTSevere Thunderstorm WarningOUNLincoln, Pottawatomie, Seminole10 min
May 9, 5:57 PM CDTTornado WarningOUNBryan33 min
May 9, 6:04 PM CDTSevere Thunderstorm WarningFWDFannin, Lamar56 min
May 9, 6:07 PM CDTSevere Thunderstorm WarningTSAPawnee23 min
May 9, 6:09 PM CDTTornado Warning Tornado observedOUNAtoka, Coal36 min
May 9, 6:12 PM CDTTornado WarningTSAChoctaw48 min
May 9, 6:16 PM CDTTornado WarningFWDFannin, Lamar29 min
May 9, 6:28 PM CDTTornado WarningTSAPawnee32 min
May 9, 6:32 PM CDTSevere Thunderstorm WarningTSAPawnee28 min
May 9, 6:36 PM CDTTornado WarningFWDLamar54 min
May 9, 6:45 PM CDTTornado WarningTSAPawnee19 min
May 9, 6:52 PM CDTSevere Thunderstorm WarningTSAPawnee38 min
May 9, 6:53 PM CDTTornado Warning Tornado observedTSAChoctaw52 min
May 9, 6:59 PM CDTSevere Thunderstorm WarningSHVMcCurtain61 min
May 9, 6:59 PM CDTTornado WarningFWDLamar31 min
May 9, 7:08 PM CDTSevere Thunderstorm WarningTSAPushmataha49 min
May 9, 7:12 PM CDTSevere Thunderstorm WarningTSAOsage, Pawnee9 min
May 9, 7:27 PM CDTSevere Thunderstorm WarningOUNAtoka18 min
May 9, 7:28 PM CDTSevere Thunderstorm WarningFWDLamar62 min
May 9, 7:43 PM CDTTornado WarningTSAChoctaw, Pushmataha13 min
May 9, 7:44 PM CDTFlash Flood WarningFWDLamar2 hr
May 9, 7:59 PM CDTSevere Thunderstorm WarningSHVLittle River, Sevier46 min
May 9, 8:00 PM CDTTornado WarningSHVRed River45 min
May 9, 8:05 PM CDTSevere Thunderstorm WarningTSACrawford, Franklin, Sebastian32 min
May 9, 8:08 PM CDTTornado WarningFWDLamar37 min
May 9, 8:14 PM CDTSevere Thunderstorm WarningSHVMcCurtain44 min
May 9, 8:24 PM CDTSevere Thunderstorm WarningTSAOsage36 min
May 9, 8:26 PM CDTSevere Thunderstorm WarningFWDLamar64 min
May 9, 8:33 PM CDTSevere Thunderstorm WarningSHVMcCurtain57 min
May 9, 8:33 PM CDTTornado WarningFWDLamar27 min
May 9, 8:43 PM CDTTornado WarningSHVRed River47 min
May 9, 8:44 PM CDTTornado WarningFWDLamar16 min
May 9, 8:49 PM CDTSevere Thunderstorm WarningSHVLittle River56 min
May 9, 8:52 PM CDTTornado WarningSHVLittle River53 min
May 9, 8:53 PM CDTSevere Thunderstorm WarningLZKPolk22 min
May 9, 8:55 PM CDTSevere Thunderstorm WarningTSAOsage35 min
May 9, 8:57 PM CDTTornado WarningSHVRed River48 min
May 9, 9:09 PM CDTSevere Thunderstorm WarningSHVHoward, Sevier36 min
May 9, 9:26 PM CDTFlash Flood WarningSHVLittle River3 hr
May 9, 9:26 PM CDTSevere Thunderstorm WarningTSAOsage, Washington34 min
May 9, 9:30 PM CDTTornado WarningSHVLittle River45 min
May 9, 9:38 PM CDTSevere Thunderstorm WarningSHVHempstead, Howard, Sevier52 min
May 9, 9:40 PM CDTSevere Thunderstorm WarningLZKClark, Pike50 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

Norman, OK (KOUN), launched 12:00Z, 7.6 hours before the alert went out and 175 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.

Skew-T log-pSkew-T log-p diagram, Norman, OK at 12:00Z on 2016-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 686 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 12:00Z on 2016-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 66 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
686 J/kg
Mixed-layer CIN
-97 J/kg
Mixed-layer LCL
620 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
66 m²/s²
0-3 km storm-relative helicity
336 m²/s²
Significant tornado parameter
0.5
Supercell composite
6.0

Open this sounding in Storm Lab

The text

As transmitted.

880 
WWUS20 KWNS 091934
SEL5  
SPC WW 091934
ARZ000-OKZ000-TXZ000-100200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 155
NWS STORM PREDICTION CENTER NORMAN OK
230 PM CDT MON MAY 9 2016

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  WESTERN ARKANSAS
  SOUTHERN AND EASTERN OKLAHOMA
  PARTS OF NORTH CENTRAL TEXAS

* EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 230 PM UNTIL
  900 PM CDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES AND A COUPLE INTENSE TORNADOES POSSIBLE
  SCATTERED LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL EVENTS
    TO 3 INCHES IN DIAMETER POSSIBLE
  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

SUMMARY...SEVERE THUNDERSTORMS ARE EXPECTED TO DEVELOP NEAR THE I-35
CORRIDOR FROM SOUTH CENTRAL OKLAHOMA INTO NORTH CENTRAL TEXAS OVER
THE NEXT FEW HOURS.  LARGE HAIL WILL BE COMMON WITH THIS ACTIVITY
AND A FEW TORNADOES...POSSIBLY STRONG...ARE EXPECTED LATER THIS
AFTERNOON.  SUPERCELLS ARE EXPECTED TO SPREAD INTO SOUTHWESTERN
ARKANSAS THIS EVENING.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTHWEST OF
ARDMORE OKLAHOMA TO 55 MILES EAST NORTHEAST OF DE QUEEN ARKANSAS.
 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU5).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 154...

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
500. MEAN STORM MOTION VECTOR 24035.


...DARROW

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 9, 1:39 PM CDTMesoscale DiscussionSPCHoward, Little River, Montgomery, Polk, Scott, Sebastian and 1 more66 min
May 9, 5:49 PM CDTMesoscale DiscussionSPCCrawford, Hempstead, Howard, Little River, Montgomery, Pike and 4 more56 min
May 9, 6:38 PM CDTMesoscale DiscussionSPCBaxter, Clay, Cleburne, Conway, Craighead, Fulton and 13 more97 min
May 8, 7:01 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Caddo, Canadian, Comanche, Cotton and 16 more89 min
May 9, 2:39 AM CDTMesoscale DiscussionSPCCarter, Comanche, Cotton, Jefferson, Johnston, Love and 4 more3 hr
May 9, 1:46 PM CDTMesoscale DiscussionSPCAdair, Alfalfa, Canadian, Cherokee, Craig, Creek and 22 more59 min
May 9, 2:07 PM CDTSevere Thunderstorm WatchSPCAdair, Alfalfa, Blaine, Canadian, Cherokee, Cleveland and 31 more10 hr
May 9, 5:29 PM CDTMesoscale DiscussionSPCAdair, Alfalfa, Blaine, Caddo, Canadian, Cherokee and 35 more61 min
May 8, 8:01 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coke, Coleman, Concho, Cooke and 29 more89 min
May 9, 5:13 PM CDTMesoscale DiscussionSPCAnderson, Angelina, Camp, Cass, Cherokee, Ellis and 25 more92 min

Nearby

Tornado Watches in Oklahoma, 2016Tornado Watches in Arkansas, 2016Tornado Watches in Texas, 2016Every tornado watch in 2016

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.