Alert archive / Oklahoma / Mesoscale Discussions in 2005

Mesoscale Discussion 866

May 13, 200518 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 13, 2005, 6:25 PM CDT for 18 counties in Oklahoma. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: May 13, 2005, 6:25 PM CDT (23:25 UTC)
Expired: May 13, 2005, 7:30 PM CDT
In force: 65 min
Issued by: the Storm Prediction Center

Counties Alfalfa County, OK, Blaine County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Grant County, OK, Kay County, OK, Kingfisher County, OK, Logan County, OK, Major County, OK, Noble County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Tulsa County, OK, Washington County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 31 km from the middle of the area, began a volume at 23:25 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 274May 13, 6:45 PM CDT

The nearest sounding before it

Lamont, OK (KLMN), launched 12:00Z, 11.4 hours before the alert went out and 50 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: 8 J/kg
Mixed-layer CIN: -435 J/kg
Mixed-layer LCL: 1421 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 221 m²/s²
0-3 km storm-relative helicity: 250 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.

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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, 4:04 AM CDT	Mesoscale Discussion	SPC	Comanche, Cotton, Stephens, Tillman	56 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, 6:45 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.