Alert archive / Oklahoma / Mesoscale Discussions in 2003

Mesoscale Discussion 2149

August 12, 200322 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Aug 12, 2003, 1:12 PM CDT for 22 counties in Oklahoma. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Aug 12, 2003, 1:12 PM CDT (18:12 UTC)
Expired: Aug 12, 2003, 2:45 PM CDT
In force: 93 min
Issued by: the Storm Prediction Center

All 22 counties

Atoka County, OK, Carter County, OK, Choctaw County, OK, Cleveland County, OK, Coal County, OK, Garvin County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Marshall County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 95 km from the middle of the area, began a volume at 18:15 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 nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 6.2 hours before the alert went out and 97 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1182 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 43 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.

303 
ACUS11 KWNS 121813
SWOMCD
SPC MCD 121812 
OKZ000-121945-

MESOSCALE DISCUSSION 2149
NWS STORM PREDICTION CENTER NORMAN OK
0112 PM CDT TUE AUG 12 2003

AREAS AFFECTED...PORTIONS OF ERN/CENTRAL TO SRN OK

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 121812Z - 121945Z

THUNDERSTORMS WILL DEVELOP OVER PORTIONS OF ERN/CENTRAL TO SRN OK
DURING THE EARLY AFTERNOON...WITH THE POTENTIAL FOR HAIL/STRONG
WINDS WITH THE STRONGER STORMS.  WW MAY BE REQUIRED IN THE NEXT FEW
HOURS.

WV IMAGERY SHOWS A SSWWD MOVING MID-UPPER LEVEL CIRCULATION OVER
SERN KS AT 1715Z.  THE AIR MASS OVER ERN OK/WRN AR CONTINUES TO
DESTABILIZE /SBCAPE 1500-2500 J/KG/...DUE TO THE COMBINATION OF
SURFACE HEATING AND COOLING MID-LEVEL TEMPERATURES /-11 TO -13 C AT
500 MB PER RUC ANALYSIS/.  VIS/REGIONAL RADAR IMAGERY SHOW A FEW
SUSTAINED UPDRAFTS OVER SRN MO TO WRN AR...WITH LIGHTNING DATA
INDICATING STRIKES OVER WRN AR DURING THE LAST HALF HOUR.  VAD/WIND
PROFILER DATA SHOW 40 KT OF NNELY MID-LEVEL FLOW EXTENDING FROM
CENTRAL IA TO CENTRAL OK/NWRN TX WITH WEAKER FLOW OVER WRN AR. THE
GREATEST POTENTIAL FOR ORGANIZED STORMS IS EXPECTED FROM THE AR/OK
BORDER WWD INTO CENTRAL OK WHERE DEEP LAYER SHEAR FOR MULTICELLULAR
AND A FEW SUPERCELLS COINCIDES WITH INCREASING SURFACE BASED
INSTABILITY.  INCREASING UVVS ASSOCIATED WITH THE UPPER FEATURE WILL
AID IN SUSTAINING UPDRAFT STRENGTH/ CONVECTIVE DEVELOPMENT ACROSS
PORTIONS OF ERN/CENTRAL TO SRN OK THIS AFTERNOON...WITH
HAIL/DAMAGING WINDS THE PRIMARY THREATS WITH THE STRONGER STORMS.

..PETERS.. 08/12/2003

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

ATTN...WFO...SHV...TSA...OUN...

34039782 35399757 35739623 35419452 34009499

Nearby

Mesoscale Discussions in Oklahoma, 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.