Alert archive / Texas / Mesoscale Discussions in 2016

Mesoscale Discussion 929

June 14, 2016Knox County, Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 14, 2016, 9:39 PM CDT for Knox County, Texas. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Jun 14, 2016, 9:39 PM CDT (02:39 UTC)
Expired: Jun 14, 2016, 11:15 PM CDT
In force: 96 min
Issued by: the Storm Prediction Center

County Knox County, TX

The radar

The Altus AFB radar (KFDR), 119 km from the middle of the area, began a volume at 02:40 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 2.7 hours before the alert went out and 236 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3768 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 0 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

847 
ACUS11 KWNS 150239
SWOMCD
SPC MCD 150239 
TXZ000-150415-

MESOSCALE DISCUSSION 0929
NWS STORM PREDICTION CENTER NORMAN OK
0939 PM CDT TUE JUN 14 2016

AREAS AFFECTED...A SMALL PART OF WRN N TX

CONCERNING...TORNADO WATCH 257...

VALID 150239Z - 150415Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 257 CONTINUES.

SUMMARY...THE SVR RISK IN WW 257 HAS BECOME CONFINED TO PARTS OF
KING AND KNOX COUNTIES. THE SVR RISK ELSEWHERE IS NOW NIL.

DISCUSSION...A SOLITARY SUPERCELL TSTM ENHANCED DURING THE DIURNAL
HEATING CYCLE WILL CONTINUE TO BE ACCOMPANIED BY SVR HAIL POTENTIAL
DURING THE NEXT HOUR OR TWO AS IT TRACKS ACROSS PARTS OF KING AND
KNOX COUNTIES IN WRN N TX. FOLLOWING INITIAL DECOUPLING OF THE
BOUNDARY LAYER...THE FDR VWP NOW SAMPLES AROUND 200 M2/S2 OF 0-1-KM
SRH AS LOW-LEVEL SHEAR HAS INCREASED. HOWEVER...MLCINH HAS BEEN SLOW
TO INCREASE OWING TO AMPLE LOW-LEVEL MOISTURE -- E.G. LOWEST-100-MB
MEAN MIXING RATIO AROUND 17.5 G/KG PER A MODIFIED 00Z OUN RAOB. AS
SUCH...SVR HAIL POTENTIAL...AND PERHAPS A BRIEF TORNADO...REMAIN
POSSIBLE THROUGH AROUND 0400Z-0430Z. THEREAFTER...THE NOCTURNAL
STABILIZATION OF THE BOUNDARY LAYER SHOULD BECOME INCREASINGLY
HOSTILE FOR CONVECTIVE MAINTENANCE...GIVEN THE DEARTH OF LARGE-SCALE
ASCENT. 

THE SVR RISK ACROSS THE REMAINDER OF THE WW IS NOW NIL.

..COHEN/CORFIDI.. 06/15/2016

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

ATTN...WFO...OUN...LUB...

LAT...LON   33650017 33710011 33819987 33719966 33589970 33540005
            33650017

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 15, 2:24 PM CDT	Mesoscale Discussion	SPC	Andrews, Bailey, Borden, Brewster, Cochran, Crane and 24 more	3 hr
Jun 15, 5:54 PM CDT	Mesoscale Discussion	SPC	Briscoe, Floyd, Hale, Hockley, Lamb, Swisher	66 min

Nearby

Mesoscale Discussions in Texas, 2016 Every 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.