Alert archive / Oklahoma / Mesoscale Discussions in 2003

Mesoscale Discussion 863

May 8, 20039 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 8, 2003, 4:47 PM CDT for 9 counties in Oklahoma. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued
May 8, 2003, 4:47 PM CDT (21:47 UTC)
Expired
May 8, 2003, 5:45 PM CDT
In force
58 min
Issued by
the Storm Prediction Center

Counties Canadian County, OK, Cleveland County, OK, Grady County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, Oklahoma County, OK, Payne County, OK, Pottawatomie County, OK

The radar

The Norman radar (KTLX), 23 km from the middle of the area, began a volume at 21:50 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, 9.8 hours before the alert went out and 29 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 12:00Z on 2003-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2594 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 12:00Z on 2003-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 164 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
2594 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
646 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
164 m²/s²
0-3 km storm-relative helicity
213 m²/s²
Significant tornado parameter
3.1
Supercell composite
11.0

Open this sounding in Storm Lab

The text

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

938 
ACUS11 KWNS 082147
SWOMCD
SPC MCD 082147 
OKZ000-082245-

MESOSCALE DISCUSSION 0863
NWS STORM PREDICTION CENTER NORMAN OK
0447 PM CDT THU MAY 08 2003

AREAS AFFECTED...OKLAHOMA CITY METRO AREA

CONCERNING...TORNADO WATCH 304...

VALID 082147Z - 082245Z

STRONG SUPERCELL STORM SHOWING HIGH POTENTIAL FOR A TORNADO
APPROACHING THE SRN OKLAHOMA CITY METRO AREA IN THE NEXT HOUR...
INCLUDING NERN GRADY COUNTY...NRN MCCLAIN COUNTY...NRN CLEVELAND
COUNTY...SERN CANADIAN COUNTY AND OKLAHOMA COUNTY. 

ENVIRONMENTAL PARAMETERS REMAIN VERY FAVORABLE FOR LONG-LIVED
TORNADIC SUPERCELLS WITH A THREAT FOR STRONG/VIOLENT TORNADOES.

..PETERS.. 05/08/2003

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

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

35389808 35909786 36189693 35999637 34809684 34689812

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 7, 8:01 PM CDTMesoscale DiscussionSPCBeckham, Caddo, Comanche, Cotton, Greer, Harmon and 4 more59 min
May 7, 10:35 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Caddo, Canadian, Cherokee, Cleveland and 29 more55 min
May 7, 10:35 PM CDTTornado WatchSPCBeckham, Bryan, Carter, Coal, Comanche, Cotton and 13 more5 hr
May 7, 10:55 PM CDTSevere Thunderstorm WatchSPCAdair, Alfalfa, Beckham, Blaine, Caddo, Canadian and 39 more5 hr
May 7, 11:51 PM CDTMesoscale DiscussionSPCBeckham, Bryan, Carter, Coal, Comanche, Cotton and 13 more54 min
May 8, 1:18 AM CDTMesoscale DiscussionSPCAdair, Blaine, Cherokee, Craig, Custer, Delaware and 19 more3 hr
May 8, 1:55 AM CDTSevere Thunderstorm WatchSPCCraig, Delaware, Grant, Kay, Nowata, Osage and 2 more5 hr
May 8, 1:57 AM CDTMesoscale DiscussionSPCAtoka, Beckham, Bryan, Carter, Coal, Comanche and 14 more2 hr
May 8, 3:50 AM CDTSevere Thunderstorm WatchSPCAdair, Atoka, Bryan, Cherokee, Choctaw, Coal and 25 more3 hr
May 8, 3:51 AM CDTMesoscale DiscussionSPCOttawa3 hr
May 8, 5:02 AM CDTMesoscale DiscussionSPCAdair, Atoka, Cherokee, Choctaw, Coal, Creek and 24 more2 hr
May 8, 6:20 AM CDTTornado WatchSPCHaskell, Latimer, LeFlore, Sequoyah3 hr
May 8, 12:49 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Garfield, Grant, Kingfisher, Kiowa and 1 more3 hr
May 8, 1:35 PM CDTTornado WatchSPCAlfalfa, Blaine, Caddo, Canadian, Carter, Cleveland and 24 more7 hr
May 8, 3:34 PM CDTMesoscale DiscussionSPCAlfalfa, Caddo, Canadian, Carter, Cleveland, Comanche and 25 more116 min
May 8, 5:31 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Coal, Craig, Creek, Delaware and 17 more59 min
May 8, 5:45 PM CDTTornado WatchSPCAdair, Cherokee, Coal, Craig, Delaware, Haskell and 17 more5 hr
May 8, 6:38 PM CDTMesoscale DiscussionSPCAdair, Carter, Cherokee, Cleveland, Coal, Craig and 35 more2 hr

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.