Alert archive / Oklahoma / Mesoscale Discussions in 2018

Mesoscale Discussion 332

May 3, 201820 counties in Oklahoma; 19 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 3, 2018, 4:06 AM CDT for 20 counties in Oklahoma; 19 counties in Texas. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued
May 3, 2018, 4:06 AM CDT (09:06 UTC)
Expired
May 3, 2018, 6:00 AM CDT
In force
114 min
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 39 counties

Bryan County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole 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, Hardeman County, TX, Haskell County, TX, Jack County, TX, King County, TX, Knox County, TX, Montague County, TX, Stonewall County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Wise County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 59 km from the middle of the area, began a volume at 09:09 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 172 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 2018-05-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1823 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 2018-05-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 135 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
1823 J/kg
Mixed-layer CIN
-104 J/kg
Mixed-layer LCL
1260 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
135 m²/s²
0-3 km storm-relative helicity
171 m²/s²
Significant tornado parameter
0.7
Supercell composite
10.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 2, 7:14 PM CDTMesoscale DiscussionSPCAtoka, Cherokee, Coal, Craig, Creek, Delaware and 18 more2 hr
May 2, 8:05 PM CDTTornado WatchSPCAdair, Atoka, Bryan, Carter, Cherokee, Choctaw and 30 more6 hr
May 2, 11:09 PM CDTMesoscale DiscussionSPCAdair, Atoka, Bryan, Carter, Cherokee, Coal and 26 more96 min
May 3, 5:18 AM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Carter, Coal, Comanche, Cotton and 11 more6 hr
May 3, 9:02 AM CDTMesoscale DiscussionSPCAdair, Cherokee, Haskell, Hughes, Latimer, LeFlore and 4 more88 min
May 3, 9:55 AM CDTMesoscale DiscussionSPCCarter, Coal, Comanche, Cotton, Garvin, Jefferson and 7 more65 min
May 3, 12:35 PM CDTMesoscale DiscussionSPCChoctaw, LeFlore, McCurtain85 min
May 2, 7:17 PM CDTMesoscale DiscussionSPCCallahan, Coke, Coleman, Concho, Crockett, Eastland and 27 more88 min
May 2, 10:27 PM CDTMesoscale DiscussionSPCBorden, Callahan, Coke, Coleman, Concho, Crockett and 28 more93 min
May 3, 5:55 AM CDTMesoscale DiscussionSPCBosque, Brown, Callahan, Coleman, Comanche, Concho and 28 more2 hr
May 3, 7:03 AM CDTSevere Thunderstorm WatchSPCBell, Bosque, Brown, Burnet, Coleman, Collin and 38 more7 hr
May 3, 5:42 PM CDTMesoscale DiscussionSPCBandera, Bexar, Dimmit, Edwards, Frio, Gillespie and 8 more2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2018Mesoscale Discussions in Texas, 2018Every mesoscale discussion in 2018

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.