Alert archive / Oklahoma / Mesoscale Discussions in 2003

Mesoscale Discussion 2021

July 30, 2003Pontotoc County, Pottawatomie County, Seminole County, Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Jul 30, 2003, 6:46 AM CDT for Pontotoc County, Pottawatomie County, Seminole County, Oklahoma. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued
Jul 30, 2003, 6:46 AM CDT (11:46 UTC)
Expired
Jul 30, 2003, 7:45 AM CDT
In force
59 min
Issued by
the Storm Prediction Center

Counties Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 54 km from the middle of the area, began a volume at 11:45 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 00:00Z, 11.8 hours before the alert went out and 53 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, Norman, OK at 00:00Z on 2003-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1586 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, Norman, OK at 00:00Z on 2003-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 square meters per square second.1939Sfc1 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
1586 J/kg
Mixed-layer CIN
-19 J/kg
Mixed-layer LCL
2170 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
13 m²/s²
0-3 km storm-relative helicity
75 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.

716 
ACUS11 KWNS 301147
SWOMCD
SPC MCD 301146 
OKZ000-301245-

MESOSCALE DISCUSSION 2021
NWS STORM PREDICTION CENTER NORMAN OK
0646 AM CDT WED JUL 30 2003

AREAS AFFECTED...CENTRAL OK

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 301146Z - 301245Z

SEVERE THUNDERSTORM CELLS AND ASSOCIATED OUTFLOW OVER ERN CLEVELAND
AND POTTAWATOMIE COUNTIES IN OK WILL CONTINUE MOVING ESEWD...LIKELY
PRODUCING SIGNIFICANT WINDS OF 50-65 KT DURING THE NEXT HOUR OR SO.

MOSAIC RADAR IMAGERY INDICATES STRONG THUNDERSTORM CELLS ON SERN
PERIPHERY OF MESOSCALE CONVECTIVE VORTEX OVER NWRN OK AT 1130Z.
SURFACE WIND GUSTS IN EXCESS OF 70KT HAVE BEEN OBSERVED WITH
MACROBURST WINDS ACROSS CLEVELAND COUNTY. GIVEN PRESENCE OF 100MB
MLCAPE VALUES OF 1000-1500 J/KG IN ADVANCE OF INTENSE
STORMS...STRONG WINDS AND LARGE HAIL WILL LIKELY AFFECT SEMINOLE AND
PONTOTAC COUNTIES THROUGH 1230Z ALONG LEADING OUTFLOW BOUNDARY
ASSOCIATED WITH THIS CONVECTION.  GENERALLY WEAK VERTICAL SHEAR
PROFILES AND SMALL-SCALE NATURE OF SYSTEM SUGGESTS IT WILL LIKELY
WEAKEN BEYOND 1-2 HOURS.

..BANACOS.. 07/30/2003

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

ATTN...WFO...OUN...

35119740 35309700 35139632 34549654 34469692

Nearby

Mesoscale Discussions in Oklahoma, 2003Every 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.