Alert archive / Oklahoma / Mesoscale Discussions in 2005

Mesoscale Discussion 845

May 12, 20058 counties in Kansas; 11 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 12, 2005, 5:18 PM CDT for 8 counties in Kansas; 11 counties in Oklahoma. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: May 12, 2005, 5:18 PM CDT (22:18 UTC)
Expired: May 12, 2005, 6:15 PM CDT
In force: 57 min
Issued by: the Storm Prediction Center

Counties Barber County, KS, Butler County, KS, Cowley County, KS, Harper County, KS, Harvey County, KS, Kingman County, KS, Sedgwick County, KS, Sumner County, KS, Alfalfa County, OK, Blaine 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, Woods County, OK

The radar

The Vance AFB radar (KVNX), 46 km from the middle of the area, began a volume at 22:21 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.

Severe Thunderstorm Watch 261May 12, 5:55 PM CDT

The nearest sounding before it

Lamont, OK (KLMN), launched 12:00Z, 10.3 hours before the alert went out and 54 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: 770 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 833 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 251 m²/s²
0-3 km storm-relative helicity: 175 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 6.8

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 11, 8:01 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Clark, Decatur, Finney, Ford, Gove and 24 more	59 min
May 11, 9:26 PM CDT	Mesoscale Discussion	SPC	Decatur, Ellis, Finney, Gove, Graham, Grant and 15 more	64 min
May 11, 9:50 PM CDT	Tornado Watch	SPC	Clark, Decatur, Edwards, Ellis, Finney, Ford and 28 more	7 hr
May 11, 11:02 PM CDT	Mesoscale Discussion	SPC	Brown, Marshall, Nemaha	58 min
May 12, 3:44 AM CDT	Mesoscale Discussion	SPC	Clay, Cloud, Jewell, Marshall, Mitchell, Republic and 1 more	61 min
May 12, 12:40 PM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Doniphan, Jackson, Jefferson, Marshall and 3 more	95 min
May 12, 1:16 PM CDT	Mesoscale Discussion	SPC	Barber, Barton, Clark, Cloud, Comanche, Edwards and 21 more	59 min
May 12, 1:35 PM CDT	Severe Thunderstorm Watch	SPC	Barber, Barton, Clark, Clay, Cloud, Comanche and 29 more	7 hr
May 12, 1:55 PM CDT	Tornado Watch	SPC	Atchison, Brown, Doniphan, Douglas, Jackson, Jefferson and 10 more	7 hr
May 12, 3:13 PM CDT	Mesoscale Discussion	SPC	Barber, Barton, Clay, Cloud, Comanche, Dickinson and 28 more	92 min
May 12, 3:48 PM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Doniphan, Douglas, Jackson, Jefferson and 10 more	87 min
May 12, 5:55 PM CDT	Severe Thunderstorm Watch	SPC	Barber, Butler, Chase, Coffey, Comanche, Cowley and 14 more	7 hr
May 11, 9:34 PM CDT	Mesoscale Discussion	SPC	Beaver, Beckham, Ellis, Greer, Harmon, Harper and 3 more	26 min
May 12, 9:34 AM CDT	Mesoscale Discussion	SPC	Beaver, Ellis	116 min
May 12, 11:30 AM CDT	Severe Thunderstorm Watch	SPC	Beaver, Ellis, Harper, Woodward	8 hr
May 12, 2:22 PM CDT	Mesoscale Discussion	SPC	Beaver, Ellis, Harper, Woodward	53 min
May 12, 2:55 PM CDT	Tornado Watch	SPC	Beckham, Greer, Harmon, Jackson	6 hr
May 12, 6:07 PM CDT	Mesoscale Discussion	SPC	Beckham, Greer, Harmon, Jackson	53 min

Nearby

Mesoscale Discussions in Oklahoma, 2005 Mesoscale Discussions in Kansas, 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.