Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 533

May 7, 201511 counties in Oklahoma; 17 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 7, 2015, 12:52 PM CDT for 11 counties in Oklahoma; 17 counties in Texas. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued
May 7, 2015, 12:52 PM CDT (17:52 UTC)
Expired
May 7, 2015, 2:45 PM CDT
In force
113 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 28 counties

Bryan County, OK, Carter County, OK, Comanche County, OK, Cotton County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Cooke County, TX, Denton County, TX, Foard County, TX, Grayson County, TX, Haskell County, TX, Jack County, TX, King County, TX, Knox County, TX, Montague County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Wise County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 69 km from the middle of the area, began a volume at 17:54 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

Fort Worth, TX (KFWD), launched 12:00Z, 5.9 hours before the alert went out and 162 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, Fort Worth, TX at 12:00Z on 2015-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 656 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, Fort Worth, TX at 12:00Z on 2015-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 191 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
656 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
632 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
191 m²/s²
0-3 km storm-relative helicity
284 m²/s²
Significant tornado parameter
0.6
Supercell composite
5.2

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, 8:08 PM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 17 more67 min
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, 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 Texas, 2015Mesoscale Discussions in Oklahoma, 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.