Alert archive / Oklahoma / Mesoscale Discussions in 2003

Mesoscale Discussion 466

April 15, 200312 counties in Kansas; 17 counties in Oklahoma; 17 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2003, 5:55 PM CDT for 12 counties in Kansas; 17 counties in Oklahoma; 17 counties in Texas. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued
Apr 15, 2003, 5:55 PM CDT (22:55 UTC)
Expired
Apr 15, 2003, 7:00 PM CDT
In force
65 min
Issued by
the Storm Prediction Center
All 46 counties

Barber County, KS, Clark County, KS, Comanche County, KS, Edwards County, KS, Ford County, KS, Gray County, KS, Hodgeman County, KS, Kiowa County, KS, Meade County, KS, Pawnee County, KS, Pratt County, KS, Rush County, KS, Alfalfa County, OK, Beaver County, OK, Beckham County, OK, Blaine County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Kiowa County, OK, Major County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Armstrong County, TX, Briscoe County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Donley County, TX, Floyd County, TX, Foard County, TX, Gray County, TX, Hall County, TX, Hardeman County, TX, Hemphill County, TX, Lipscomb County, TX, Motley County, TX, Ochiltree County, TX, Roberts County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 157 km from the middle of the area, began a volume at 22:55 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 10.9 hours before the alert went out and 157 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, Amarillo Airport, TX at 12:00Z on 2003-04-15Temperature 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, Amarillo Airport, TX at 12:00Z on 2003-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 58 square meters per square second.1939587897Sfc1 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
2381 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
58 m²/s²
0-3 km storm-relative helicity
71 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.

IssuedProductOfficeCountiesLasted
Apr 15, 12:41 PM CDTMesoscale DiscussionSPCClark, Finney, Ford, Grant, Gray, Haskell and 7 more3 hr
Apr 15, 2:10 PM CDTTornado WatchSPCClark, Comanche, Edwards, Finney, Ford, Grant and 14 more5 hr
Apr 15, 3:32 PM CDTMesoscale DiscussionSPCClark, Comanche, Edwards, Ford, Kiowa118 min
Apr 15, 3:45 PM CDTTornado WatchSPCDecatur, Ellis, Gove, Graham, Logan, Norton and 10 more5 hr
Apr 15, 6:30 PM CDTTornado WatchSPCBarber, Barton, Clark, Comanche, Edwards, Ford and 16 more5 hr
Apr 15, 6:57 PM CDTMesoscale DiscussionSPCDecatur, Graham, Norton, Osborne, Phillips, Rooks and 3 more93 min
Apr 15, 4:36 PM CDTMesoscale DiscussionSPCHarmon, Jackson, Tillman84 min
Apr 15, 5:00 PM CDTTornado WatchSPCComanche, Greer, Harmon, Jackson, Kiowa, Tillman6 hr
Apr 15, 12:12 PM CDTMesoscale DiscussionSPCBailey, Castro, Cochran, Deaf Smith, Gaines, Hale and 9 more2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2003Mesoscale Discussions in Texas, 2003Mesoscale Discussions in Kansas, 2003Every 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.