Alert archive / Oklahoma / Mesoscale Discussions in 2003

Mesoscale Discussion 648

April 30, 200320 counties in Oklahoma; 8 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2003, 8:17 PM CDT for 20 counties in Oklahoma; 8 counties in Texas. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued
Apr 30, 2003, 8:17 PM CDT (01:17 UTC)
Expired
Apr 30, 2003, 9:45 PM CDT
In force
88 min
Issued by
the Storm Prediction Center
All 28 counties

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, Grady County, OK, Grant County, OK, Greer County, OK, Jackson County, OK, Kingfisher County, OK, Kiowa County, OK, Major County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Foard County, TX, Hardeman County, TX, Knox County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 74 km from the middle of the area, began a volume at 01:18 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

Norman, OK (KOUN), launched 00:00Z, 1.3 hours before the alert went out and 137 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, Norman, OK at 00:00Z on 2003-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2775 joules per kilogram.LCLLFCEL10008507005003002001001 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, Norman, OK at 00:00Z on 2003-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.19395878Sfc1 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
2775 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
1288 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
82 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.7

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 30, 7:30 PM CDTSevere Thunderstorm WatchSPCGarfield, Grant, Kay, Logan, Noble, Osage and 2 more6 hr
Apr 30, 9:52 PM CDTMesoscale DiscussionSPCGarfield, Grant, Kay, Logan, Noble, Osage and 2 more83 min
Apr 30, 11:47 PM CDTMesoscale DiscussionSPCGarfield, Grant, Kay, Logan, Noble, Osage and 2 more118 min
May 1, 12:10 AM CDTSevere Thunderstorm WatchSPCCraig, Garfield, Grant, Kay, Noble, Nowata and 4 more5 hr
May 1, 2:27 AM CDTMesoscale DiscussionSPCCraig, Delaware, Mayes, Nowata, Osage, Ottawa and 2 more2 hr
May 1, 10:55 AM CDTMesoscale DiscussionSPCBryan, Coal, Johnston, Love, Marshall2 hr
May 1, 2:13 PM CDTMesoscale DiscussionSPCChoctaw, Haskell, Latimer, LeFlore, McCurtain, McIntosh and 4 more3 hr
May 1, 3:45 PM CDTTornado WatchSPCAdair, Cherokee, Choctaw, Delaware, Haskell, Latimer and 11 more5 hr
May 1, 6:58 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Choctaw, Delaware, Haskell, Latimer and 12 more92 min
May 1, 2:33 PM CDTMesoscale DiscussionSPCBosque, Brown, Burnet, Camp, Comanche, Concho and 34 more117 min
May 1, 2:55 PM CDTTornado WatchSPCBosque, Bowie, Brown, Burnet, Camp, Collin and 35 more5 hr
May 1, 6:10 PM CDTMesoscale DiscussionSPCBosque, Burnet, Camp, Collin, Comanche, Coryell and 31 more95 min

Nearby

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