Alert archive / Oklahoma / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 539

June 13, 200320 counties in Oklahoma

The Storm Prediction Center issued this severe thunderstorm watch at Jun 13, 2003, 7:05 PM CDT for 20 counties in Oklahoma. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jun 13, 2003, 7:05 PM CDT (00:05 UTC)
Expired: Jun 14, 2003, 12:00 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

Counties Caddo County, OK, Canadian County, OK, Cleveland County, OK, Creek County, OK, Grady County, OK, Hughes County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, McIntosh County, OK, Muskogee County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Wagoner County, OK

The radar

The Norman radar (KTLX), 20 km from the middle of the area, began a volume at 00:09 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.

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 00:00Z, 0.1 hours before the alert went out and 36 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1344 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1253 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 29 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.

445 
WWUS20 KWNS 140005
SEL9  
SPC WW 140005
OKZ000-140500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 539 
NWS STORM PREDICTION CENTER NORMAN OK 
705 PM CDT FRI JUN 13 2003

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

       CENTRAL AND EASTERN OKLAHOMA

EFFECTIVE THIS FRIDAY NIGHT FROM 705 PM UNTIL MIDNIGHT CDT.

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

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 45 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 45 MILES WEST OF OKLAHOMA CITY
OKLAHOMA TO 25 MILES SOUTH OF MUSKOGEE OKLAHOMA.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.


OTHER WATCH INFORMATION...CONTINUE...WW 534...WW 535...WW 536...WW
537...WW 538...


DISCUSSION...E/W CONVERGENCE LINE IS FOCUSING RAPIDLY DEVELOPING
THUNDERSTORMS ACROSS CENTRAL OK. WITH MLCAPES ABOVE 2500 J/KG LARGE
HAIL AND ISOLATED DOWNBURSTS WINDS LIKELY IN SLOW MOVING STORMS.

AVIATION...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 550. MEAN STORM
MOTION VECTOR 26015.


...HALES

360,0982 355,0952 343,0952 344,0982

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 13, 7:34 PM CDT	Mesoscale Discussion	SPC	Beckham, Blaine, Cimarron, Comanche, Custer, Dewey and 10 more	86 min
Jun 13, 8:10 PM CDT	Severe Thunderstorm Watch	SPC	Beckham, Blaine, Comanche, Custer, Greer, Harmon and 5 more	4 hr
Jun 13, 9:59 PM CDT	Mesoscale Discussion	SPC	Beckham, Caddo, Comanche, Custer, Dewey, Greer and 6 more	61 min
Jun 14, 10:49 AM CDT	Mesoscale Discussion	SPC	Beckham, Blaine, Caddo, Custer, Dewey, Ellis and 9 more	3 hr

Nearby

Severe Thunderstorm Watches in Oklahoma, 2003 Every severe thunderstorm watch in 2003

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.