Alert archive / Oklahoma / Mesoscale Discussions in 2007

Mesoscale Discussion 1455

July 12, 20078 counties in Kansas; 21 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Jul 12, 2007, 5:34 AM CDT for 8 counties in Kansas; 21 counties in Oklahoma. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 12, 2007, 5:34 AM CDT (10:34 UTC)
Expired
Jul 12, 2007, 8:00 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 29 counties

Barber County, KS, Clark County, KS, Comanche County, KS, Harper County, KS, Kingman County, KS, Kiowa County, KS, Pratt County, KS, Sumner County, KS, Alfalfa County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Harper County, OK, Kay County, OK, Kingfisher County, OK, Logan County, OK, Major County, OK, Noble County, OK, Oklahoma County, OK, Pawnee County, OK, Payne County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 59 km from the middle of the area, began a volume at 10:34 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.

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 10.6 hours before the alert went out and 74 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, Lamont, OK at 00:00Z on 2007-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Lamont, OK at 00:00Z on 2007-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1675 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
218 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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.

IssuedProductOfficeCountiesLasted
Jul 11, 7:12 PM CDTTornado WatchSPCCheyenne, Greeley, Sherman, Wallace6 hr
Jul 11, 10:17 PM CDTMesoscale DiscussionSPCGrant, Hamilton, Kearny, Morton, Stanton, Stevens88 min
Jul 12, 1:31 AM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Comanche, Cowley, Edwards and 21 more2 hr
Jul 12, 3:41 PM CDTMesoscale DiscussionSPCClark, Grant, Haskell, Meade, Morton, Seward and 1 more2 hr
Jul 12, 4:55 PM CDTMesoscale DiscussionSPCCheyenne, Cloud, Decatur, Ellis, Gove, Graham and 18 more95 min
Jul 12, 5:19 PM CDTSevere Thunderstorm WatchSPCBarton, Cheyenne, Clay, Cloud, Decatur, Dickinson and 29 more7 hr
Jul 12, 5:54 PM CDTSevere Thunderstorm WatchSPCBarber, Clark, Comanche, Edwards, Finney, Ford and 19 more7 hr
Jul 12, 5:46 AM CDTSevere Thunderstorm WatchSPCBlaine, Caddo, Canadian, Cleveland, Creek, Custer and 23 more5 hr
Jul 12, 7:47 AM CDTMesoscale DiscussionSPCBlaine, Caddo, Canadian, Cleveland, Creek, Custer and 21 more118 min
Jul 12, 10:39 AM CDTMesoscale DiscussionSPCAtoka, Carter, Coal, Haskell, Johnston, Latimer and 7 more66 min

Nearby

Mesoscale Discussions in Oklahoma, 2007Mesoscale Discussions in Kansas, 2007Every mesoscale discussion in 2007

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.