Alert archive / Texas / Mesoscale Discussions in 2016

Mesoscale Discussion 402

April 16, 20167 counties in Oklahoma; 8 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 16, 2016, 10:48 PM CDT for 7 counties in Oklahoma; 8 counties in Texas. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
Apr 16, 2016, 10:48 PM CDT (03:48 UTC)
Expired
Apr 17, 2016, 12:45 AM CDT
In force
117 min
Issued by
the Storm Prediction Center

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, Foard County, TX, Hardeman County, TX, Knox County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 7 km from the middle of the area, began a volume at 03:52 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

Norman, OK (KOUN), launched 00:00Z, 3.8 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, Norman, OK at 00:00Z on 2016-04-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 120 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, Norman, OK at 00:00Z on 2016-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 173 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
120 J/kg
Mixed-layer CIN
-110 J/kg
Mixed-layer LCL
899 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
173 m²/s²
0-3 km storm-relative helicity
239 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The text

As transmitted.

686 
ACUS11 KWNS 170348
SWOMCD
SPC MCD 170348 
TXZ000-OKZ000-170545-

MESOSCALE DISCUSSION 0402
NWS STORM PREDICTION CENTER NORMAN OK
1048 PM CDT SAT APR 16 2016

AREAS AFFECTED...WESTERN NORTH TX AND SOUTHWEST OK

CONCERNING...SEVERE THUNDERSTORM WATCH 95...

VALID 170348Z - 170545Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 95
CONTINUES.

SUMMARY...THE THREAT FOR STORMS PRODUCING PRIMARILY DAMAGING WINDS
AND/OR HAIL CONTINUES ACROSS WESTERN NORTH TX AND FAR SOUTHWEST OK
THROUGH LATE THIS EVENING TO THE EARLY OVERNIGHT.

DISCUSSION...MOSAIC RADAR IMAGERY SHOWED STORMS HAD EVOLVED INTO A
LINEAR STORM MODE FROM FAR SOUTHWEST OK /EASTERN GREER AND WESTERN
JACKSON COUNTIES/ INTO HARDEMAN AND WESTERN FOARD COUNTIES TX. 
MEANWHILE...SOME SEMI-DISCRETE AND CLUSTERS OF STORMS WERE TRACKING
NORTHWARD THROUGH THE NORTHERN AND EASTERN PARTS OF WW 95. 
ADDITIONAL STORMS WERE INCREASING IN COVERAGE AND INTENSITY TO THE
SOUTH/SOUTHEAST OF WW 95 IN PALO PINTO AND ERATH COUNTIES TX.  THESE
LATTER STORMS SHOULD MOVE INTO THE SOUTHEAST PORTION OF THE WATCH BY
0430Z.

THE NORTHERN EXTENT OF A SEVERE-WEATHER THREAT INTO THE EARLY
OVERNIGHT IS EXPECTED TO REMAIN WITHIN WW 95...AS A CONTINUED INFLUX
OF MOISTURE/INSTABILITY PER STRENGTHENING SOUTH-SOUTHEASTERLY
LOW-LEVEL WINDS PERSISTS.  THIS PROCESS SHOULD COMPENSATE FOR
ONGOING DIURNAL STABILIZATION FROM NORTH-SOUTH...WHILE EFFECTIVE
BULK SHEAR REMAINS SUFFICIENTLY STRONG FOR STORM ORGANIZATION.

..PETERS.. 04/17/2016

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

ATTN...WFO...FWD...OUN...LUB...AMA...

LAT...LON   35049999 35139943 35119866 34879834 34839809 34169809
            33489793 33409859 33429998 34060005 35049999

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 16, 7:07 PM CDTSevere Thunderstorm WatchSPCComanche, Cotton, Greer, Harmon, Jackson, Kiowa and 1 more7 hr
Apr 16, 8:27 PM CDTMesoscale DiscussionSPCBeaver63 min
Apr 17, 1:47 AM CDTMesoscale DiscussionSPCComanche, Cotton, Greer, Harmon, Jackson, Kiowa and 1 more58 min
Apr 16, 7:42 PM CDTMesoscale DiscussionSPCBorden, Coke, Concho, Crockett, Fisher, Glasscock and 18 more93 min
Apr 16, 10:43 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coke, Coleman, Comanche, Concho and 20 more92 min
Apr 16, 11:51 PM CDTSevere Thunderstorm WatchSPCBrown, Callahan, Coke, Coleman, Comanche, Concho and 27 more7 hr
Apr 17, 2:01 AM CDTMesoscale DiscussionSPCBrown, Callahan, Coleman, Comanche, Concho, Eastland and 17 more59 min
Apr 17, 7:48 AM CDTMesoscale DiscussionSPCBell, Bosque, Burnet, Coryell, Falls, Hamilton and 3 more87 min
Apr 17, 2:47 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Blanco, Caldwell, Comal and 8 more88 min
Apr 17, 5:25 PM CDTMesoscale DiscussionSPCBandera, Bexar, Blanco, Frio, Gillespie, Kendall and 1 more2 hr

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.