Alert archive / Oklahoma / Mesoscale Discussions in 2013

Mesoscale Discussion 1669

August 8, 201336 counties in Oklahoma; 7 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Aug 8, 2013, 5:02 PM CDT for 36 counties in Oklahoma; 7 counties in Texas. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued
Aug 8, 2013, 5:02 PM CDT (22:02 UTC)
Expired
Aug 8, 2013, 6:30 PM CDT
In force
88 min
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 43 counties

Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Creek County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Major County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Clay County, TX, Cooke County, TX, Jack County, TX, Montague County, TX, Wichita County, TX, Young County, TX

The radar

The Norman radar (KTLX), 78 km from the middle of the area, began a volume at 22:04 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, 10.0 hours before the alert went out and 61 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 2013-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 696 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 2013-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 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
696 J/kg
Mixed-layer CIN
-239 J/kg
Mixed-layer LCL
819 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
89 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.8

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
Aug 7, 8:16 PM CDTMesoscale DiscussionSPCBeaver, Cimarron, Texas89 min
Aug 7, 9:02 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Custer, Dewey, Ellis, Garfield and 6 more88 min
Aug 7, 10:24 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 17 more7 hr
Aug 7, 11:30 PM CDTMesoscale DiscussionSPCBeaver, Texas60 min
Aug 8, 3:18 AM CDTMesoscale DiscussionSPCCreek, Kay, Lincoln, Logan, Noble, Nowata and 7 more87 min
Aug 8, 3:57 AM CDTSevere Thunderstorm WatchSPCCraig, Delaware, Mayes, Nowata, Osage, Ottawa and 3 more3 hr
Aug 8, 3:00 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Cimarron, Ellis, Greer, Harmon and 2 more60 min
Aug 8, 3:21 PM CDTSevere Thunderstorm WatchSPCBeaver, Beckham, Cimarron, Custer, Dewey, Greer and 7 more9 hr
Aug 8, 5:24 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Delaware, Haskell, Latimer, LeFlore and 1 more66 min
Aug 8, 5:32 PM CDTSevere Thunderstorm WatchSPCAdair, Cherokee, Creek, Delaware, Haskell, Latimer and 11 more6 hr
Aug 8, 6:23 PM CDTSevere Thunderstorm WatchSPCAtoka, Blaine, Bryan, Caddo, Canadian, Carter and 22 more8 hr
Aug 8, 6:47 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Cimarron, Custer, Dewey, Greer and 7 more88 min

Nearby

Mesoscale Discussions in Oklahoma, 2013Mesoscale Discussions in Texas, 2013Every mesoscale discussion in 2013

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.