Alert archive / Oklahoma / Tornado Watches in 2008

Tornado Watch 342

May 23, 200817 counties in Oklahoma; 8 counties in Texas

The Storm Prediction Center issued this tornado watch at May 23, 2008, 5:09 PM CDT for 17 counties in Oklahoma; 8 counties in Texas. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
May 23, 2008, 5:09 PM CDT (22:09 UTC)
Expired
May 24, 2008, 1:00 AM CDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt
All 25 counties

Alfalfa County, OK, Beaver County, OK, Beckham County, OK, Blaine County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Kiowa County, OK, Major County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Collingsworth County, TX, Donley County, TX, Gray County, TX, Hemphill County, TX, Lipscomb County, TX, Ochiltree County, TX, Roberts County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 160 km from the middle of the area, began a volume at 22:13 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
40%
One or more EF2 to EF5 tornadoes
30%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 23, 5:20 PM CDTSevere Thunderstorm WarningAMABeaver55 min
May 23, 5:44 PM CDTSevere Thunderstorm WarningAMABeaver61 min
May 23, 5:53 PM CDTTornado WarningAMABeaver37 min
May 23, 6:10 PM CDTSevere Thunderstorm WarningAMAHemphill, Lipscomb50 min
May 23, 6:41 PM CDTSevere Thunderstorm WarningOUNEllis, Harper49 min
May 23, 6:46 PM CDTSevere Thunderstorm WarningAMABeaver14 min
May 23, 6:56 PM CDTTornado WarningOUNEllis19 min
May 23, 7:17 PM CDTTornado WarningOUNEllis13 min
May 23, 7:27 PM CDTTornado WarningOUNEllis, Harper, Woodward33 min
May 23, 7:57 PM CDTTornado WarningOUNHarper, Woodward33 min
May 23, 8:10 PM CDTSevere Thunderstorm WarningOUNHarper50 min
May 23, 8:24 PM CDTTornado WarningOUNHarper, Woods, Woodward36 min
May 23, 9:00 PM CDTTornado WarningOUNWoods15 min
May 23, 9:01 PM CDTSevere Thunderstorm WarningAMABeaver59 min
May 23, 9:13 PM CDTSevere Thunderstorm WarningAMABeaver62 min
May 23, 9:32 PM CDTSevere Thunderstorm WarningOUNEllis, Harper58 min
May 23, 9:34 PM CDTTornado WarningAMABeaver26 min
May 23, 10:00 PM CDTSevere Thunderstorm WarningAMABeaver30 min
May 23, 10:09 PM CDTSevere Thunderstorm WarningAMABeaver66 min
May 23, 10:28 PM CDTSevere Thunderstorm WarningOUNEllis, Harper, Woods, Woodward62 min
May 23, 11:16 PM CDTSevere Thunderstorm WarningAMAHemphill, Lipscomb14 min
May 23, 11:26 PM CDTSevere Thunderstorm WarningOUNEllis, Harper, Woods, Woodward64 min
May 23, 11:50 PM CDTSevere Thunderstorm WarningAMACollingsworth, Hemphill, Wheeler55 min
May 23, 11:55 PM CDTSevere Thunderstorm WarningOUNBeckham, Dewey, Ellis, Roger Mills35 min
May 24, 12:28 AM CDTSevere Thunderstorm WarningOUNAlfalfa, Beckham, Custer, Dewey, Ellis, Major and 3 more62 min
May 24, 12:42 AM CDTSevere Thunderstorm WarningAMAWheeler33 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 10.2 hours before the alert went out and 160 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, Amarillo Airport, TX at 12:00Z on 2008-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Amarillo Airport, TX at 12:00Z on 2008-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -63 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2746 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
-63 m²/s²
0-3 km storm-relative helicity
52 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000
WWUS20 KWNS 232210
SEL2  
SPC WW 232210
OKZ000-TXZ000-240600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 342
NWS STORM PREDICTION CENTER NORMAN OK
510 PM CDT FRI MAY 23 2008

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       WESTERN OKLAHOMA AND EASTERN PARTS OF THE OKLAHOMA PANHANDLE
       EASTERN PARTS OF THE TEXAS PANHANDLE

EFFECTIVE THIS FRIDAY AFTERNOON AND SATURDAY MORNING FROM 510 PM
UNTIL 100 AM CDT.

TORNADOES...HAIL TO 2.5 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 65 STATUTE
MILES EAST AND WEST OF A LINE FROM 50 MILES SOUTHWEST OF CLINTON
OKLAHOMA TO 50 MILES NORTH OF GAGE OKLAHOMA.  FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU2).

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 340...WW 341...

DISCUSSION...SCTD TSTMS/SUPERCELLS MAY FORM THIS EVENING ON DRY LINE
CONFLUENCE ZONE EXTENDING S INTO WW FROM WRN KS.  ANY SUCH
DEVELOPMENT WILL BE FOSTERED BY COMBINATION OF SFC HEATING AND
GLANCING INFLUENCE OF UPPER IMPULSE ROTATING NE ACROSS NE NM/ERN CO.
ALTHOUGH LARGE HAIL AND LOCALLY DMGG WIND SHOULD BE THE MAIN
THREATS...GIVEN QUALITY OF MOISTURE INFLOW/LOW-LEVEL
INSTABILITY...AND LIKELIHOOD FOR FAIRLY DISCRETE STORM
MODE...POTENTIAL WILL ALSO EXIST FOR TORNADOES.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 23030.


...CORFIDI

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 22, 8:16 PM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Beckham, Blaine, Canadian, Creek and 21 more29 min
May 22, 9:11 PM CDTTornado WatchSPCAlfalfa, Blaine, Canadian, Creek, Custer, Dewey and 16 more8 hr
May 22, 11:43 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Canadian, Creek, Custer, Dewey and 16 more62 min
May 23, 2:01 AM CDTMesoscale DiscussionSPCAlfalfa, Garfield, Grant, Kay, Kingfisher, Lincoln and 7 more89 min
May 23, 2:49 PM CDTMesoscale DiscussionSPCBeaver, Ellis, Harper, Roger Mills, Woodward116 min

Nearby

Tornado Watches in Oklahoma, 2008Tornado Watches in Texas, 2008Every tornado watch in 2008

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.