Alert archive / Oklahoma / Mesoscale Discussions in 2015

Mesoscale Discussion 549

May 8, 201517 counties in Oklahoma; 9 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 8, 2015, 3:45 PM CDT for 17 counties in Oklahoma; 9 counties in Texas. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
May 8, 2015, 3:45 PM CDT (20:45 UTC)
Expired
May 8, 2015, 5:15 PM CDT
In force
90 min
Issued by
the Storm Prediction Center
All 26 counties

Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Jackson County, OK, Jefferson County, OK, Kiowa County, OK, McClain County, OK, Murray County, OK, Oklahoma County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Foard County, TX, Hardeman County, TX, Knox County, TX, Montague County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 20 km from the middle of the area, began a volume at 20:48 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, 8.8 hours before the alert went out and 154 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 2015-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 171 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 2015-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 180 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
171 J/kg
Mixed-layer CIN
-108 J/kg
Mixed-layer LCL
656 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
180 m²/s²
0-3 km storm-relative helicity
119 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

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 7, 8:49 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Choctaw, Pushmataha86 min
May 7, 11:05 PM CDTMesoscale DiscussionSPCChoctaw, McCurtain, Pushmataha85 min
May 8, 12:22 PM CDTMesoscale DiscussionSPCCaddo, Comanche, Cotton, Greer, Harmon, Jackson and 4 more83 min
May 8, 12:51 PM CDTTornado WatchSPCBeckham, Caddo, Canadian, Carter, Cleveland, Comanche and 22 more8 hr
May 8, 2:12 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Carter, Cleveland, Coal, Comanche and 22 more93 min
May 8, 5:24 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Craig, Creek, Delaware, Haskell and 15 more96 min
May 8, 6:50 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Coal, Garvin and 7 more85 min
May 8, 8:57 AM CDTMesoscale DiscussionSPCBailey, Briscoe, Castro, Childress, Cottle, Crosby and 18 more93 min
May 8, 9:31 AM CDTTornado WatchSPCAndrews, Armstrong, Bailey, Borden, Briscoe, Callahan and 40 more7 hr
May 8, 2:48 PM CDTMesoscale DiscussionSPCBailey, Borden, Cottle, Crosby, Dawson, Dickens and 18 more87 min
May 8, 3:26 PM CDTMesoscale DiscussionSPCCoke, Crockett, Edwards, Glasscock, Irion, Kinney and 8 more94 min
May 8, 3:50 PM CDTTornado WatchSPCAndrews, Borden, Callahan, Coke, Crane, Crockett and 27 more8 hr
May 8, 5:15 PM CDTMesoscale DiscussionSPCBell, Brazos, Burleson, Falls, Freestone, Grimes and 8 more90 min
May 8, 6:13 PM CDTMesoscale DiscussionSPCBaylor, Borden, Callahan, Coke, Concho, Crane and 31 more2 hr

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.