Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 636

May 3, 20178 counties in Arkansas; 6 counties in Oklahoma; 17 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 3, 2017, 7:48 AM CDT for 8 counties in Arkansas; 6 counties in Oklahoma; 17 counties in Texas. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
May 3, 2017, 7:48 AM CDT (12:48 UTC)
Expired
May 3, 2017, 9:45 AM CDT
In force
117 min
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 31 counties

Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Pike County, AR, Polk County, AR, Sevier County, AR, Atoka County, OK, Bryan County, OK, Choctaw County, OK, Latimer County, OK, McCurtain County, OK, Pushmataha County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Delta County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Hopkins County, TX, Hunt County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Rains County, TX, Red River County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 185 km from the middle of the area, began a volume at 12:48 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 nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 0.8 hours before the alert went out and 188 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, Shreveport, LA at 12:00Z on 2017-05-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 614 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, Shreveport, LA at 12:00Z on 2017-05-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 186 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
614 J/kg
Mixed-layer CIN
-325 J/kg
Mixed-layer LCL
1001 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
186 m²/s²
0-3 km storm-relative helicity
120 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

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 3, 4:54 AM CDTMesoscale DiscussionSPCBenton, Washington96 min
May 3, 12:34 PM CDTSevere Thunderstorm WatchSPCColumbia, Hempstead, Lafayette, Miller, Nevada5 hr
May 3, 1:48 PM CDTMesoscale DiscussionSPCHempstead, Little River, Miller87 min
May 3, 3:59 PM CDTMesoscale DiscussionSPCLafayette, Miller91 min
May 2, 10:53 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Blaine, Dewey, Ellis, Garfield, Grant and 9 more5 hr
May 3, 1:30 AM CDTMesoscale DiscussionSPCAdair, Alfalfa, Beckham, Blaine, Caddo, Canadian and 46 more2 hr
May 3, 1:54 AM CDTSevere Thunderstorm WatchSPCCraig, Delaware, Mayes, Nowata, Osage, Ottawa and 3 more4 hr
May 3, 7:04 AM CDTMesoscale DiscussionSPCAngelina, Chambers, Hardin, Houston, Jasper, Jefferson and 12 more86 min
May 3, 7:32 AM CDTTornado WatchSPCAngelina, Chambers, Hardin, Jasper, Jefferson, Liberty and 10 more9 hr
May 3, 10:07 AM CDTMesoscale DiscussionSPCAngelina, Hardin, Jasper, Jefferson, Newton, Orange and 3 more83 min
May 3, 11:23 AM CDTMesoscale DiscussionSPCCoryell, Dallas, Ellis, Falls, Freestone, Henderson and 9 more2 hr
May 3, 1:58 PM CDTMesoscale DiscussionSPCAngelina, Chambers, Hardin, Jasper, Jefferson, Newton and 4 more62 min
May 3, 3:48 PM CDTMesoscale DiscussionSPCAngelina, Chambers, Hardin, Houston, Jasper, Jefferson and 12 more87 min
May 3, 5:00 PM CDTSevere Thunderstorm WatchSPCAngelina, Austin, Bastrop, Brazoria, Brazos, Burleson and 29 more7 hr

Nearby

Mesoscale Discussions in Texas, 2017Mesoscale Discussions in Arkansas, 2017Mesoscale Discussions in Oklahoma, 2017Every mesoscale discussion in 2017

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.