Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 560

May 9, 20157 counties in Oklahoma; 18 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 9, 2015, 4:03 AM CDT for 7 counties in Oklahoma; 18 counties in Texas. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
May 9, 2015, 4:03 AM CDT (09:03 UTC)
Expired
May 9, 2015, 5:00 AM CDT
In force
57 min
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 25 counties

Comanche County, OK, Cotton County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kiowa County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Fisher County, TX, Foard County, TX, Hardeman County, TX, Haskell County, TX, Jack County, TX, Jones County, TX, Knox County, TX, Shackelford County, TX, Stephens County, TX, Stonewall County, TX, Taylor County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 97 km from the middle of the area, began a volume at 09:06 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 00:00Z, 9.1 hours before the alert went out and 210 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 00:00Z on 2015-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1762 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 00:00Z on 2015-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 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
1762 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
903 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
174 m²/s²
Significant tornado parameter
2.1
Supercell composite
12.8

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 8, 7:27 PM CDTTornado WatchSPCAtoka, Bryan, Carter, Choctaw, Coal, Creek and 18 more6 hr
May 8, 10:43 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Choctaw, Coal, Haskell, Latimer and 4 more92 min
May 9, 3:11 AM CDTSevere Thunderstorm WatchSPCBeaver, Cimarron, Texas8 hr
May 9, 5:51 AM CDTMesoscale DiscussionSPCBeaver, Beckham, Blaine, Cimarron, Comanche, Custer and 14 more84 min
May 9, 7:36 AM CDTSevere Thunderstorm WatchSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 22 more6 hr
May 9, 9:41 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Choctaw, Coal, Johnston, LeFlore and 5 more2 hr
May 9, 11:36 AM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Caddo, Comanche, Cotton, Greer and 7 more84 min
May 9, 1:21 PM CDTTornado WatchSPCAtoka, Bryan, Caddo, Canadian, Carter, Cleveland and 23 more10 hr
May 9, 1:58 PM CDTMesoscale DiscussionSPCLeFlore, McCurtain92 min
May 9, 2:40 PM CDTTornado WatchSPCMcCurtain7 hr
May 9, 3:32 PM CDTMesoscale DiscussionSPCBryan, Carter, Coal, Cotton, Garvin, Hughes and 10 more118 min
May 9, 4:52 PM CDTMesoscale DiscussionSPCBeckham, Greer, Harmon, Roger Mills83 min
May 9, 5:52 PM CDTMesoscale DiscussionSPCBryan, Carter, Cotton, Jefferson, Johnston, Love and 1 more83 min
May 8, 8:42 PM CDTMesoscale DiscussionSPCAndrews, Borden, Callahan, Coke, Coleman, Concho and 28 more2 hr
May 8, 10:48 PM CDTMesoscale DiscussionSPCAndrews, Borden, Callahan, Coke, Crane, Crockett and 26 more87 min
May 9, 2:34 AM CDTMesoscale DiscussionSPCAndrews, Bailey, Castro, Cochran, Dallam, Dawson and 14 more116 min
May 9, 5:06 PM CDTMesoscale DiscussionSPCCass54 min
May 9, 6:21 PM CDTMesoscale DiscussionSPCBrown, Coleman, Comanche, Eastland, Erath, Hood and 6 more84 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.