Alert archive / Oklahoma / Mesoscale Discussions in 2003

Mesoscale Discussion 896

May 9, 200317 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 9, 2003, 10:51 PM CDT for 17 counties in Oklahoma. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: May 9, 2003, 10:51 PM CDT (03:51 UTC)
Expired: May 9, 2003, 11:45 PM CDT
In force: 54 min
Issued by: the Storm Prediction Center

Counties Cherokee County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Lincoln County, OK, Mayes County, OK, Muskogee County, OK, Nowata County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Rogers County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 63 km from the middle of the area, began a volume at 03:52 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.

Tornado Watch 330May 9, 11:10 PM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 3.9 hours before the alert went out and 140 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: 2823 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 1182 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 151 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

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

046 
ACUS11 KWNS 100351
SWOMCD
SPC MCD 100351 
ARZ000-MOZ000-OKZ000-100445-

MESOSCALE DISCUSSION 0896
NWS STORM PREDICTION CENTER NORMAN OK
1051 PM CDT FRI MAY 09 2003

AREAS AFFECTED...NERN OK

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 100351Z - 100445Z

THUNDERSTORMS WILL CONTINUE TO MOVE NEWD INTO NERN OK DURING THE
NEXT FEW HOURS.  NEW WW MAY BE REQUIRED FOR PORTIONS OF NERN OK.

OBJECTIVE ANALYSES SHOWS THE AIR MASS OVER NRN INTO NERN OK
CONTINUES TO DESTABILIZE...WITH VERY STRONG INSTABILITY OVER THIS
REGION.  IN ADDITION...THE CAP THAT WAS EVIDENT ON THE OUN 00Z
SOUNDING IS WEAKENING EWD OF OKC TO OKM-TUL-BVO.  TORNADIC SUPERCELL
OVER OKLAHOMA COUNTY WILL HAVE A HIGH POTENTIAL TO CONTINUE NEWD
INTO LINCOLN COUNTY BY 0415Z...AND INTO CREEK COUNTY BETWEEN
0515-0545Z.

..PETERS.. 05/10/2003

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

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

35539765 36849663 36839456 35589477

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 9, 7:12 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 20 more	63 min
May 9, 7:45 PM CDT	Tornado Watch	SPC	Alfalfa, Beckham, Blaine, Canadian, Custer, Dewey and 9 more	5 hr
May 9, 7:47 PM CDT	Mesoscale Discussion	SPC	Craig, Mayes, Nowata, Osage, Ottawa, Pawnee and 2 more	88 min
May 9, 8:24 PM CDT	Mesoscale Discussion	SPC	Blaine, Canadian, Custer, Garfield, Kingfisher, Logan and 2 more	66 min
May 9, 9:41 PM CDT	Mesoscale Discussion	SPC	Blaine, Canadian, Kingfisher, Logan, Oklahoma	64 min
May 9, 11:10 PM CDT	Tornado Watch	SPC	Cherokee, Craig, Creek, Delaware, Lincoln, Mayes and 12 more	6 hr
May 10, 1:22 AM CDT	Mesoscale Discussion	SPC	Cherokee, Craig, Creek, Delaware, Lincoln, Mayes and 12 more	83 min
May 10, 9:16 AM CDT	Mesoscale Discussion	SPC	Cleveland, Craig, Creek, Hughes, Lincoln, McClain and 12 more	3 hr
May 10, 10:54 AM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Craig, Creek, Delaware, Mayes and 6 more	66 min
May 10, 11:55 AM CDT	Tornado Watch	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 30 more	7 hr
May 10, 1:59 PM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 29 more	2 hr

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.