Alert archive / Oklahoma / Mesoscale Discussions in 2015

Mesoscale Discussion 527

May 6, 201523 counties in Oklahoma; 16 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 6, 2015, 8:08 PM CDT for 23 counties in Oklahoma; 16 counties in Texas. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
May 6, 2015, 8:08 PM CDT (01:08 UTC)
Expired
May 6, 2015, 9:15 PM CDT
In force
67 min
Issued by
the Storm Prediction Center
All 39 counties

Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Grady County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Kingfisher County, OK, Kiowa County, OK, Major County, OK, Roger Mills 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, Haskell County, TX, Jack County, TX, Jones County, TX, Knox County, TX, Palo Pinto County, TX, Shackelford County, TX, Stephens County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 16 km from the middle of the area, began a volume at 01:10 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, 1.1 hours before the alert went out and 189 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 2015-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1821 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 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 2015-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 246 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
1821 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
916 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
246 m²/s²
0-3 km storm-relative helicity
343 m²/s²
Significant tornado parameter
3.0
Supercell composite
19.3

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 6, 8:51 PM CDTTornado WatchSPCAlfalfa, Blaine, Caddo, Canadian, Carter, Cleveland and 26 more5 hr
May 6, 10:53 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Caddo, Canadian, Carter, Cleveland and 26 more2 hr
May 7, 1:16 AM CDTSevere Thunderstorm WatchSPCCotton, Jefferson, Love, Marshall, Tillman4 hr
May 7, 4:24 AM CDTMesoscale DiscussionSPCBryan, Carter, Cotton, Jefferson, Love, Marshall66 min
May 7, 10:20 AM CDTMesoscale DiscussionSPCComanche, Cotton, Greer, Harmon, Jackson, Kiowa and 1 more115 min
May 7, 12:52 PM CDTMesoscale DiscussionSPCBryan, Carter, Comanche, Cotton, Jefferson, Johnston and 5 more113 min
May 7, 1:10 PM CDTSevere Thunderstorm WatchSPCCaddo, Canadian, Cleveland, Comanche, Cotton, Garvin and 10 more7 hr
May 7, 2:47 PM CDTMesoscale DiscussionSPCCimarron118 min
May 7, 3:51 PM CDTMesoscale DiscussionSPCBryan, Carter, Love, Marshall114 min
May 7, 4:33 PM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Carter, Coal, Johnston, Love and 3 more7 hr
May 7, 6:19 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Cleveland, Coal and 11 more86 min
May 7, 5:41 PM CDTMesoscale DiscussionSPCBrown, Callahan, Comanche, Eastland, Erath, Fisher and 7 more94 min

Nearby

Mesoscale Discussions in Oklahoma, 2015Mesoscale Discussions in Texas, 2015Every mesoscale discussion in 2015

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.