Alert archive / Oklahoma / Mesoscale Discussions in 2003

Mesoscale Discussion 965

May 13, 20035 counties in Kansas; 26 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 13, 2003, 9:58 PM CDT for 5 counties in Kansas; 26 counties in Oklahoma. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 13, 2003, 9:58 PM CDT (02:58 UTC)
Expired: May 14, 2003, 12:30 AM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 31 counties

Barber County, KS, Comanche County, KS, Cowley County, KS, Harper County, KS, Sumner County, KS, Alfalfa County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Grady County, OK, Grant County, OK, Harper County, OK, Kay County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, McClain County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Pawnee County, OK, Payne County, OK, Pottawatomie County, OK, Washita County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 87 km from the middle of the area, began a volume at 03:02 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.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 365May 13, 10:20 PM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 3.0 hours before the alert went out and 108 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: 3007 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 995 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 192 m²/s²
0-3 km storm-relative helicity: 283 m²/s²
Significant tornado parameter: 4.6
Supercell composite: 17.9

Open this sounding in Storm Lab

The text

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

743 
ACUS11 KWNS 140259
SWOMCD
SPC MCD 140258 
OKZ000-KSZ000-140530-

MESOSCALE DISCUSSION 0965
NWS STORM PREDICTION CENTER NORMAN OK
0958 PM CDT TUE MAY 13 2003

AREAS AFFECTED...EXTREME SRN KS AND NRN/CNTRL OK

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 140258Z - 140530Z

THUNDERSTORMS EXPECTED TO DEVELOP OVER PARTS OF EXTREME SRN KS AND
OR NRN OK BEFORE MIDNIGHT. THE STORMS CURRENTLY DEVELOPING OVER SRN
OK MAY ALSO INCREASE. VERY LARGE HAIL AND DAMAGING WIND SHOULD BE
THE PRIMARY THREATS. WW MAY BE NEEDED IN ANOTHER HOUR OR TWO.

SURFACE ANALYSIS THIS EVENING SHOWS REMNANT OUTFLOW BOUNDARY/WARM
FRONT EXTENDING FROM A SURFACE LOW IN THE OK PANHANDLE SEWD THROUGH
N CNTRL AND SERN OK. DEWPOINTS IN THE LOW 70S HAVE ADVECTED NWD
UNDERNEATH STEEP LAPSE RATES RESULTING IN A VERY UNSTABLE ATMOSPHERE
IN VICINITY OF AND S OF THE BOUNDARY FROM S CNTRL KS THROUGH MUCH OF
OK. INCREASING WARM ADVECTION ASSOCIATED WITH DEVELOPING SLY LOW
LEVEL JET SHOULD SUPPORT THUNDERSTORMS DEVELOPMENT ALONG AND N OF
THIS BOUNDARY LATER TONIGHT. BOTH THE ETA AND RUC SHOW A STRONG
SIGNAL FOR DEVELOPMENT. THE STORMS DEVELOPING IN WARM ADVECTION
REGIME OVER SRN OK MAY ALSO INCREASE. CLOUD LAYER SHEAR WILL BE
SUPPORTIVE OF SUPERCELLS...AND THERMODYNAMIC PROFILES ARE FAVORABLE
FOR VERY LARGE HAIL WITH ANY SUSTAINED UPDRAFTS.

..DIAL.. 05/14/2003

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...TSA...ICT...OUN...DDC...

34639819 35189933 37049993 37669868 37259663 35319628

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 13, 8:38 PM CDT	Mesoscale Discussion	SPC	Brown, Clay, Cloud, Marshall, Nemaha, Ottawa and 3 more	2 hr
May 13, 10:20 PM CDT	Severe Thunderstorm Watch	SPC	Clark	7 hr
May 14, 4:52 PM CDT	Mesoscale Discussion	SPC	Barber, Comanche, Harper	113 min
May 14, 1:34 AM CDT	Mesoscale Discussion	SPC	Atoka, Blaine, Caddo, Canadian, Cleveland, Coal and 32 more	116 min
May 14, 3:49 AM CDT	Mesoscale Discussion	SPC	Atoka, Blaine, Bryan, Caddo, Canadian, Carter and 38 more	116 min
May 14, 4:05 AM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Blaine, Bryan, Caddo, Canadian, Carter and 23 more	5 hr
May 14, 5:50 AM CDT	Mesoscale Discussion	SPC	Atoka, Blaine, Bryan, Caddo, Canadian, Carter and 23 more	115 min
May 14, 7:40 AM CDT	Mesoscale Discussion	SPC	Beckham, Bryan, Carter, Comanche, Cotton, Custer and 11 more	95 min
May 14, 10:55 AM CDT	Mesoscale Discussion	SPC	Bryan, Choctaw, Johnston, McCurtain, Marshall	2 hr
May 14, 2:30 PM CDT	Tornado Watch	SPC	Choctaw, McCurtain, Pushmataha	6 hr
May 14, 3:23 PM CDT	Mesoscale Discussion	SPC	Cotton, Jefferson, Love, Tillman	2 hr
May 14, 6:28 PM CDT	Mesoscale Discussion	SPC	Greer, Harmon, Jackson	2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2003 Mesoscale Discussions in Kansas, 2003 Every mesoscale discussion 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.