Alert archive / Oklahoma / Mesoscale Discussions in 2005

Mesoscale Discussion 855

May 13, 20054 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 13, 2005, 4:04 AM CDT for 4 counties in Oklahoma. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: May 13, 2005, 4:04 AM CDT (09:04 UTC)
Expired: May 13, 2005, 5:00 AM CDT
In force: 56 min
Issued by: the Storm Prediction Center

Counties Comanche County, OK, Cotton County, OK, Stephens County, OK, Tillman County, OK

The radar

The Altus AFB radar (KFDR), 29 km from the middle of the area, began a volume at 09:04 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, 9.1 hours before the alert went out and 144 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: 1128 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 708 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 214 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.

000 
ACUS11 KWNS 130904
SWOMCD
SPC MCD 130904 
OKZ000-TXZ000-131000-

MESOSCALE DISCUSSION 0855
NWS STORM PREDICTION CENTER NORMAN OK
0404 AM CDT FRI MAY 13 2005

AREAS AFFECTED...S CENTRAL AND SWRN OK

CONCERNING...SEVERE THUNDERSTORM WATCH 265...

VALID 130904Z - 131000Z

SEVERE THREAT HAS DIMINISHED ACROSS WW 265.  WATCH WILL LIKELY BE
ALLOWED TO EXPIRE AT 13/10Z.

ARCING / SUB-SEVERE LINE OF STORMS HAS MOVED E OF WW...WITH MOST
ACTIVE CONVECTION NOW OVER SRN PORTIONS OF WW. STRONGEST OF THESE
STORMS REMAIN W OF WW OVER WRN N TX / WITHIN WW 266...AND MAY MOVE
INTO WW 265 IN THE NEXT HOUR OR SO.  NONETHELESS...STORMS ARE
BECOMING INCREASINGLY ELEVATED ABOVE SEWD-MOVING OUTFLOW ASSOCIATED
WITH CONVECTIVE LINE...AND SHOULD WEAKEN AS THEY ENCOUNTER
RAIN-COOLED AIRMASS ACROSS SRN OK.  THEREFORE...WILL LIKELY ALLOW WW
265 TO EXPIRE AS SCHEDULED.

..GOSS.. 05/13/2005

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

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

34559955 34809831 34689750 34169768 34159960

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 12, 7:56 PM CDT	Mesoscale Discussion	SPC	Beckham, Greer, Harmon, Jackson	64 min
May 12, 8:40 PM CDT	Tornado Watch	SPC	Greer, Harmon, Jackson	5 hr
May 12, 9:35 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Custer, Dewey, Ellis and 10 more	85 min
May 12, 10:48 PM CDT	Mesoscale Discussion	SPC	Caddo, Comanche, Cotton, Garvin, Grady, Jefferson and 3 more	57 min
May 12, 11:35 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Blaine, Caddo, Canadian, Comanche, Cotton and 17 more	5 hr
May 13, 1:04 AM CDT	Mesoscale Discussion	SPC	Caddo, Canadian, Comanche, Cotton, Garfield, Grady and 5 more	86 min
May 13, 1:52 PM CDT	Mesoscale Discussion	SPC	Harmon, Jackson	83 min
May 13, 2:10 PM CDT	Tornado Watch	SPC	Beckham, Blaine, Caddo, Comanche, Cotton, Custer and 8 more	7 hr
May 13, 3:50 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Craig, Garfield, Grant, Harper, Kay and 8 more	85 min
May 13, 5:05 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Blaine, Craig, Custer, Delaware, Dewey and 21 more	7 hr
May 13, 5:56 PM CDT	Mesoscale Discussion	SPC	Beckham, Blaine, Caddo, Comanche, Cotton, Custer and 8 more	64 min
May 13, 6:25 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Custer, Dewey, Garfield, Grant and 12 more	65 min
May 13, 6:45 PM CDT	Tornado Watch	SPC	Blaine, Caddo, Canadian, Cleveland, Comanche, Cotton and 20 more	7 hr

Nearby

Mesoscale Discussions in Oklahoma, 2005 Every mesoscale discussion in 2005

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.