Alert archive / Oklahoma / Mesoscale Discussions in 2013

Mesoscale Discussion 685

May 18, 201339 counties in Oklahoma; 27 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 18, 2013, 9:03 PM CDT for 39 counties in Oklahoma; 27 counties in Texas. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
May 18, 2013, 9:03 PM CDT (02:03 UTC)
Expired
May 18, 2013, 10:00 PM CDT
In force
57 min
Issued by
the Storm Prediction Center
All 66 counties

Alfalfa County, OK, Beaver County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Jefferson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, McClain County, OK, Noble County, OK, Oklahoma County, OK, Pawnee County, OK, Payne County, OK, Pottawatomie County, OK, Roger Mills County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Archer County, TX, Baylor County, TX, Callahan County, TX, Childress County, TX, Clay County, TX, Coke County, TX, Coleman County, TX, Collingsworth County, TX, Cottle County, TX, Fisher County, TX, Foard County, TX, Hardeman County, TX, Haskell County, TX, Hemphill County, TX, Jones County, TX, King County, TX, Knox County, TX, Lipscomb County, TX, Nolan County, TX, Runnels County, TX, Shackelford County, TX, Stonewall County, TX, Taylor County, TX, Throckmorton County, TX, Wheeler County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 23 km from the middle of the area, began a volume at 02:04 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 00:00Z, 2.1 hours before the alert went out and 180 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 2013-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3824 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 2013-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 109 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
3824 J/kg
Mixed-layer CIN
-124 J/kg
Mixed-layer LCL
1277 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
109 m²/s²
0-3 km storm-relative helicity
170 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.8

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
May 18, 10:44 PM CDTMesoscale DiscussionSPCCleveland, Creek, Garvin, Grady, Hughes, Lincoln and 14 more31 min
May 18, 11:00 PM CDTSevere Thunderstorm WatchSPCCarter, Cleveland, Coal, Comanche, Cotton, Craig and 24 more4 hr
May 19, 5:25 AM CDTMesoscale DiscussionSPCCraig, Nowata, Washington2 hr
May 19, 12:51 PM CDTMesoscale DiscussionSPCAlfalfa, Grant, Kay, Nowata, Washington114 min
May 19, 1:45 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Caddo, Canadian, Carter, Cleveland and 26 more60 min
May 19, 2:14 PM CDTTornado WatchSPCAdair, Atoka, Bryan, Caddo, Canadian, Carter and 50 more9 hr
May 19, 3:27 PM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Ellis, Harper, Woods, Woodward63 min
May 19, 4:37 PM CDTMesoscale DiscussionSPCCleveland, Lincoln, Oklahoma, Pottawatomie53 min
May 19, 5:08 PM CDTMesoscale DiscussionSPCCleveland, Creek, Lincoln, Oklahoma, Pottawatomie37 min
May 19, 6:27 PM CDTMesoscale DiscussionSPCCreek, Kay, Lincoln, Noble, Okfuskee, Oklahoma and 5 more63 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.