Alert archive / Oklahoma / Tornado Watches in 2002

Tornado Watch 283

May 11, 20025 counties in Oklahoma; Hemphill County, Lipscomb County, Roberts County, Texas

The Storm Prediction Center issued this tornado watch at May 11, 2002, 6:00 PM CDT for 5 counties in Oklahoma; Hemphill County, Lipscomb County, Roberts County, Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 11, 2002, 6:00 PM CDT (23:00 UTC)
Expired
May 11, 2002, 11:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Ellis County, OK, Harper County, OK, Roger Mills County, OK, Woods County, OK, Woodward County, OK, Hemphill County, TX, Lipscomb County, TX, Roberts County, TX

The radar

The Dodge City radar (KDDC), 175 km from the middle of the area, began a volume at 23:04 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

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

IssuedProductOfficeCountiesLasted
May 11, 8:45 PM CDTSevere Thunderstorm WarningOUNWoods45 min

The nearest sounding before it

Dodge City, (KDDC), launched 12:00Z, 11.0 hours before the alert went out and 176 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, Dodge City, at 12:00Z on 2002-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1296 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, Dodge City, at 12:00Z on 2002-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 494 square meters per square second.1939587897Sfc1 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
1296 J/kg
Mixed-layer CIN
-195 J/kg
Mixed-layer LCL
719 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
494 m²/s²
0-3 km storm-relative helicity
564 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.5

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 112244
SEL3  
SPC WW 112240
OKZ000-TXZ000-120400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 283
STORM PREDICTION CENTER NORMAN OK
540 PM CDT SAT MAY 11 2002

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

   NORTHWEST OKLAHOMA                           
   NORTHEAST TEXAS PANHANDLE                              

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 600 PM UNTIL
1100 PM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 50 STATUTE MILES EAST AND WEST
OF A LINE FROM 50 MILES SOUTH SOUTHWEST OF GAGE OKLAHOMA TO 55
MILES NORTH NORTHEAST OF GAGE OKLAHOMA.

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 282...

DISCUSSION...INCREASING TCU ALONG DRYLINE...DEEP CONVEGENCE...AND
WEAK CAP SUGGEST THAT THUNDERSTORMS MAY DEVELOP DURING THE NEXT 1-2
HOURS OVER THE NORTHEAST TX PANHANDLE AND NORTHWEST OK.  SUPERCELLS
CAPABLE OF DAMAGING WINDS AND LARGE HAIL ARE LIKELY.  SLIGHTLY
BACKED LOW LEVEL WINDS AND STRONG INSTABILITY ALSO SUGGEST THE
POTENTIAL FOR A FEW TORNADOES.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 26030.

...HART

370,0982 353,0991 353,1010 370,1001

WWUS20 KWNS 112244
SEL3  
SPC WW 112240
OKZ000-TXZ000-120400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 283
STORM PREDICTION CENTER NORMAN OK
540 PM CDT SAT MAY 11 2002

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

   NORTHWEST OKLAHOMA                           
   NORTHEAST TEXAS PANHANDLE                              

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 600 PM UNTIL
1100 PM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 50 STATUTE MILES EAST AND WEST
OF A LINE FROM 50 MILES SOUTH SOUTHWEST OF GAGE OKLAHOMA TO 55
MILES NORTH NORTHEAST OF GAGE OKLAHOMA.

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 282...

DISCUSSION...INCREASING TCU ALONG DRYLINE...DEEP CONVEGENCE...AND
WEAK CAP SUGGEST THAT THUNDERSTORMS MAY DEVELOP DURING THE NEXT 1-2
HOURS OVER THE NORTHEAST TX PANHANDLE AND NORTHWEST OK.  SUPERCELLS
CAPABLE OF DAMAGING WINDS AND LARGE HAIL ARE LIKELY.  SLIGHTLY
BACKED LOW LEVEL WINDS AND STRONG INSTABILITY ALSO SUGGEST THE
POTENTIAL FOR A FEW TORNADOES.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 26030.

...HART

370,0982 353,0991 353,1010 370,1001

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 10, 10:45 PM CDTTornado WatchSPCCotton, Tillman4 hr
May 11, 1:00 AM CDTSevere Thunderstorm WatchSPCAlfalfa, Beaver, Ellis, Harper, Roger Mills, Woods and 1 more5 hr
May 10, 8:00 PM CDTSevere Thunderstorm WatchSPCBailey, Briscoe, Castro, Childress, Cochran, Collingsworth and 17 more5 hr
May 10, 11:00 PM CDTSevere Thunderstorm WatchSPCArmstrong, Carson, Collingsworth, Dallam, Deaf Smith, Donley and 14 more5 hr

Nearby

Tornado Watches in Oklahoma, 2002Tornado Watches in Texas, 2002Every tornado watch in 2002

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.