Alert archive / Oklahoma / Mesoscale Discussions in 2003

Mesoscale Discussion 473

April 15, 20039 counties in Kansas; 16 counties in Oklahoma; 4 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2003, 9:04 PM CDT for 9 counties in Kansas; 16 counties in Oklahoma; 4 counties in Texas. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Apr 15, 2003, 9:04 PM CDT (02:04 UTC)
Expired: Apr 15, 2003, 10:30 PM CDT
In force: 86 min
Issued by: the Storm Prediction Center

All 29 counties

Barber County, KS, Harper County, KS, Harvey County, KS, Kingman County, KS, Pratt County, KS, Reno County, KS, Sedgwick County, KS, Stafford County, KS, Sumner County, KS, Alfalfa County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Grant County, OK, Kingfisher County, OK, Kiowa County, OK, Major County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Baylor County, TX, Knox County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 119 km from the middle of the area, began a volume at 02:06 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, 2.1 hours before the alert went out and 136 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: 15 J/kg
Mixed-layer CIN: -337 J/kg
Mixed-layer LCL: 1137 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 380 m²/s²
0-3 km storm-relative helicity: 627 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
Apr 15, 11:20 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Butler, Chautauqua, Cherokee, Crawford, Elk and 6 more	6 hr
Apr 16, 12:49 AM CDT	Mesoscale Discussion	SPC	Anderson, Atchison, Chase, Clay, Coffey, Douglas and 17 more	116 min
Apr 16, 2:01 AM CDT	Mesoscale Discussion	SPC	Allen, Cherokee, Labette, Neosho	119 min
Apr 15, 7:11 PM CDT	Mesoscale Discussion	SPC	Comanche, Harmon, Jackson, Tillman	2 hr
Apr 15, 8:35 PM CDT	Mesoscale Discussion	SPC	Carter, Cleveland, Creek, Garvin, Grady, Jefferson and 16 more	115 min
Apr 15, 9:00 PM CDT	Tornado Watch	SPC	Carter, Cleveland, Coal, Creek, Garvin, Grady and 15 more	5 hr
Apr 15, 11:00 PM CDT	Mesoscale Discussion	SPC	Canadian, Carter, Cleveland, Coal, Cotton, Creek and 21 more	2 hr
Apr 16, 1:41 AM CDT	Mesoscale Discussion	SPC	Brown, Comanche, Coryell, Erath, Hamilton, Kimble and 8 more	2 hr

Nearby

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