Alert archive / Texas / Mesoscale Discussions in 2016

Mesoscale Discussion 692

May 23, 20167 counties in Oklahoma; 9 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 23, 2016, 4:58 AM CDT for 7 counties in Oklahoma; 9 counties in Texas. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
May 23, 2016, 4:58 AM CDT (09:58 UTC)
Expired
May 23, 2016, 6:00 AM CDT
In force
62 min
Issued by
the Storm Prediction Center

Counties Atoka County, OK, Bryan County, OK, Choctaw County, OK, Jefferson County, OK, Love County, OK, Marshall County, OK, Pushmataha County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Cooke County, TX, Fannin County, TX, Grayson County, TX, Lamar County, TX, Montague County, TX, Wichita County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 148 km from the middle of the area, began a volume at 09:59 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, 10.0 hours before the alert went out and 119 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 2016-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1646 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 2016-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 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
1646 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
1187 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
65 m²/s²
Significant tornado parameter
0.3
Supercell composite
4.7

Open this sounding in Storm Lab

The text

As transmitted.

358 
ACUS11 KWNS 230959
SWOMCD
SPC MCD 230958 
OKZ000-TXZ000-231100-

MESOSCALE DISCUSSION 0692
NWS STORM PREDICTION CENTER NORMAN OK
0458 AM CDT MON MAY 23 2016

AREAS AFFECTED...PORTIONS OF SRN OK AND N TX

CONCERNING...SEVERE THUNDERSTORM WATCH 198...

VALID 230958Z - 231100Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 198
CONTINUES.

SUMMARY...AN ONGOING MATURE MCS ALONG THE RED RIVER AND VICINITY IS
FORECAST TO BE DECAYING DURING THE PRE-DAWN HOURS...WITH THE SVR
RISK LESSENING. ADDITIONAL WW ISSUANCE WILL NOT BE REQUIRED.

DISCUSSION...THE FORWARD-PROPAGATING PORTION OF AN MCS ACROSS SRN
OK/N TX IS SPREADING EWD/ESEWD ACROSS ATOKA AND BRYAN COUNTIES OK
AND GRAYSON COUNTY TX. OK MESONET OBSERVATIONS SUGGEST THAT RECENT
PEAK WIND GUSTS IN ASSOCIATION WITH THE APEX OF THE LEADING
CONVECTIVE LINE ARE ONLY AROUND 40-50 MPH. AS INFLOW CONTINUES TO
STABILIZE OWING TO NOCTURNAL COOLING...AND AS THE MCS INTERCEPTS THE
WRN FRINGES OF A CONTINENTAL AIR MASS...THE MCS WILL BE WEAKENING
DURING THE SUBSEQUENT PRE-DAWN HOURS. ACCORDINGLY...THE SVR-WIND
RISK WILL LESSEN AS CONVECTION MOVES ACROSS PARTS OF SERN OK AND
ADJACENT N TX...THOUGH LOCALLY GUSTY WINDS WILL REMAIN POSSIBLE.
CONVECTION EVOLVING WITHIN THE UPSHEAR-PROPAGATION REGIME WWD TOWARD
WICHITA FALLS AND VICINITY WILL POSE LITTLE SVR RISK AS SWD-SAGGING
OUTFLOW UNDERCUTS INCIPIENT CONVECTIVE CELLS.

..COHEN.. 05/23/2016

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

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

LAT...LON   33779944 34209843 34239778 34099701 34479624 34589531
            33969487 33649518 33309634 33349851 33509931 33779944

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 22, 7:02 PM CDTMesoscale DiscussionSPCBeaver118 min
May 22, 7:46 PM CDTMesoscale DiscussionSPCComanche, Greer, Jackson, Kiowa, Tillman89 min
May 22, 8:48 PM CDTSevere Thunderstorm WatchSPCComanche, Cotton, Greer, Harmon, Jackson, Jefferson and 3 more5 hr
May 22, 9:10 PM CDTMesoscale DiscussionSPCBeaver65 min
May 23, 1:36 AM CDTMesoscale DiscussionSPCCarter, Comanche, Cotton, Jefferson, Love, Marshall and 2 more84 min
May 23, 2:15 AM CDTSevere Thunderstorm WatchSPCCarter, Cotton, Jackson, Jefferson, Love, Marshall and 2 more5 hr
May 23, 2:18 PM CDTMesoscale DiscussionSPCBeckham, Dewey, Ellis, Harmon, Harper, Major and 3 more117 min
May 23, 3:37 PM CDTTornado WatchSPCBeaver, Beckham, Custer, Dewey, Ellis, Greer and 9 more8 hr
May 23, 6:08 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Custer, Dewey, Ellis, Greer and 9 more2 hr
May 22, 9:35 PM CDTMesoscale DiscussionSPCIrion, Reagan85 min
May 23, 1:32 PM CDTMesoscale DiscussionSPCBorden, Coke, Crockett, Crosby, Dawson, Garza and 15 more118 min
May 23, 2:32 PM CDTTornado WatchSPCBorden, Brewster, Briscoe, Childress, Coke, Cottle and 37 more7 hr
May 23, 5:29 PM CDTMesoscale DiscussionSPCBorden, Briscoe, Coke, Cottle, Crockett, Crosby and 30 more91 min

Nearby

Mesoscale Discussions in Texas, 2016Mesoscale Discussions in Oklahoma, 2016Every mesoscale discussion in 2016

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.