Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 366

March 29, 20176 counties in Oklahoma; 13 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 29, 2017, 2:54 AM CDT for 6 counties in Oklahoma; 13 counties in Texas. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Mar 29, 2017, 2:54 AM CDT (07:54 UTC)
Expired
Mar 29, 2017, 4:30 AM CDT
In force
96 min
Issued by
the Storm Prediction Center

Counties Atoka County, OK, Bryan County, OK, Choctaw County, OK, Marshall County, OK, McCurtain County, OK, Pushmataha County, OK, Collin County, TX, Delta County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 176 km from the middle of the area, began a volume at 07:54 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 nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 7.9 hours before the alert went out and 156 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 2017-03-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 822 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 2017-03-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 160 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
822 J/kg
Mixed-layer CIN
-53 J/kg
Mixed-layer LCL
1580 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
160 m²/s²
0-3 km storm-relative helicity
289 m²/s²
Significant tornado parameter
0.5
Supercell composite
14.5

Open this sounding in Storm Lab

The text

As transmitted.

442 
ACUS11 KWNS 290754
SWOMCD
SPC MCD 290754 
OKZ000-TXZ000-290930-

Mesoscale Discussion 0366
NWS Storm Prediction Center Norman OK
0254 AM CDT Wed Mar 29 2017

Areas affected...Northeast TX and far southeast OK

Concerning...Severe Thunderstorm Watch 96...97...

Valid 290754Z - 290930Z

The severe weather threat for Severe Thunderstorm Watch 96, 97
continues.

SUMMARY...An increasingly confined corridor for strong to embedded
severe wind gusts is anticipated as a bowing QLCS over the Metroplex
approaches the Red River. Downstream WW issuance is unlikely.

DISCUSSION...Primary zone of strong to embedded severe wind gusts
within an extensive QLCS from central OK to south-central TX exists
within the bowing portion of the line currently traversing the
Metroplex and adjacent north-central TX. Air mass downstream towards
the Red River is characterized by lower surface dew points from the
upper 50s to lower 60s and weak buoyancy relative to farther south.
With a decreasing reflectivity gradient to the south of the bow,
likely due to continued ingest of large MLCIN, the overall area of
strong to embedded severe wind gusts should decrease in the next few
hours.

..Grams/Dial.. 03/29/2017

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...SHV...TSA...FWD...OUN...

LAT...LON   33769714 34099690 34569607 34499488 34289474 33699477
            32819529 32579578 32609661 33769714

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 28, 7:58 PM CDTMesoscale DiscussionSPCBlaine, Caddo, Canadian, Cleveland, Comanche, Cotton and 20 more92 min
Mar 28, 10:21 PM CDTSevere Thunderstorm WatchSPCCarter, Cleveland, Coal, Comanche, Cotton, Creek and 19 more7 hr
Mar 28, 10:25 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Carter, Cherokee, Cleveland, Coal and 32 more65 min
Mar 29, 1:21 AM CDTMesoscale DiscussionSPCAtoka, Carter, Coal, Garvin, Hughes, Johnston and 9 more84 min
Mar 29, 2:51 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Craig, Delaware, Mayes, Nowata and 2 more2 hr
Mar 29, 4:17 PM CDTTornado WatchSPCAdair, LeFlore, McCurtain, Sequoyah8 hr
Mar 29, 6:08 PM CDTMesoscale DiscussionSPCCraig, Ottawa97 min
Mar 28, 7:45 PM CDTMesoscale DiscussionSPCArmstrong, Briscoe, Carson, Castro, Crosby, Deaf Smith and 9 more60 min
Mar 28, 9:07 PM CDTMesoscale DiscussionSPCBandera, Bexar, Blanco, Brown, Burnet, Callahan and 37 more23 min
Mar 28, 9:28 PM CDTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bell, Bexar, Blanco, Bosque and 78 more8 hr
Mar 28, 11:58 PM CDTMesoscale DiscussionSPCAnderson, Bastrop, Bell, Bexar, Blanco, Bosque and 29 more92 min
Mar 29, 8:23 AM CDTMesoscale DiscussionSPCBrazoria, Calhoun, Chambers, Fort Bend, Galveston, Hardin and 12 more67 min
Mar 29, 1:31 PM CDTMesoscale DiscussionSPCBrazoria, Chambers, Galveston, Hardin, Harris, Jasper and 7 more2 hr
Mar 29, 2:11 PM CDTTornado WatchSPCAngelina, Chambers, Galveston, Hardin, Jasper, Jefferson and 6 more7 hr
Mar 29, 5:50 PM CDTMesoscale DiscussionSPCJasper, Newton, Orange115 min

Nearby

Mesoscale Discussions in Texas, 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.