Alert archive / Oklahoma / Mesoscale Discussions in 2007

Mesoscale Discussion 2094

October 17, 200731 counties in Oklahoma; 7 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 17, 2007, 1:20 PM CDT for 31 counties in Oklahoma; 7 counties in Texas. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
Oct 17, 2007, 1:20 PM CDT (18:20 UTC)
Expired
Oct 17, 2007, 2:45 PM CDT
In force
85 min
Issued by
the Storm Prediction Center
All 38 counties

Atoka County, OK, Bryan County, OK, Cherokee County, OK, Choctaw County, OK, Coal County, OK, Creek County, OK, Delaware County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Lincoln County, OK, Marshall County, OK, Mayes County, OK, McCurtain County, OK, McIntosh County, OK, Muskogee County, OK, Nowata County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Collin County, TX, Delta County, TX, Fannin County, TX, Grayson County, TX, Hunt County, TX, Lamar County, TX, Red River County, TX

The radar

The Norman radar (KTLX), 128 km from the middle of the area, began a volume at 18:22 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 12:00Z, 6.3 hours before the alert went out and 134 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 12:00Z on 2007-10-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 719 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 12:00Z on 2007-10-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 367 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
719 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
476 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
367 m²/s²
0-3 km storm-relative helicity
396 m²/s²
Significant tornado parameter
1.1
Supercell composite
5.9

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
Oct 16, 10:36 PM CDTMesoscale DiscussionSPCBeckham, Greer, Harmon, Jackson, Roger Mills114 min
Oct 17, 1:12 AM CDTMesoscale DiscussionSPCBeaver, Beckham, Dewey, Ellis, Harmon, Harper and 4 more93 min
Oct 17, 1:36 AM CDTTornado WatchSPCBeckham, Custer, Dewey, Ellis, Greer, Harmon and 7 more7 hr
Oct 17, 1:44 AM CDTSevere Thunderstorm WatchSPCBeaver, Texas7 hr
Oct 17, 4:07 AM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Canadian, Cleveland, Craig, Creek and 19 more113 min
Oct 17, 6:07 AM CDTMesoscale DiscussionSPCBeckham, Custer, Dewey, Ellis, Greer, Harmon and 7 more113 min
Oct 17, 6:50 AM CDTMesoscale DiscussionSPCBeaver, Texas100 min
Oct 17, 7:43 AM CDTTornado WatchSPCBlaine, Caddo, Canadian, Carter, Cleveland, Comanche and 33 more7 hr
Oct 17, 10:24 AM CDTMesoscale DiscussionSPCAdair, Cherokee, Cleveland, Craig, Creek, Delaware and 25 more96 min
Oct 17, 10:43 AM CDTTornado WatchSPCAdair, Cherokee, Craig, Delaware, Haskell, McIntosh and 7 more7 hr
Oct 17, 2:25 PM CDTTornado WatchSPCAlfalfa, Atoka, Blaine, Bryan, Caddo, Canadian and 44 more8 hr
Oct 17, 4:31 PM CDTTornado WatchSPCAdair, Cherokee, Craig, Delaware, Haskell, LeFlore and 9 more7 hr
Oct 17, 6:23 PM CDTMesoscale DiscussionSPCAdair, Atoka, Bryan, Carter, Cherokee, Choctaw and 43 more37 min
Oct 16, 11:45 PM CDTSevere Thunderstorm WatchSPCArmstrong, Carson, Collingsworth, Donley, Gray, Hansford and 10 more2 hr
Oct 17, 4:41 AM CDTMesoscale DiscussionSPCArcher, Baylor, Borden, Brown, Callahan, Coke and 32 more2 hr
Oct 17, 9:36 AM CDTMesoscale DiscussionSPCJasper, Jefferson, Newton, Orange, Panola, Sabine and 2 more114 min
Oct 17, 11:13 AM CDTTornado WatchSPCAngelina, Bowie, Camp, Cass, Cherokee, Franklin and 21 more7 hr
Oct 17, 2:36 PM CDTMesoscale DiscussionSPCAngelina, Bowie, Camp, Cass, Cherokee, Franklin and 22 more114 min

Nearby

Mesoscale Discussions in Oklahoma, 2007Mesoscale Discussions in Texas, 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.