Alert archive / Texas / Mesoscale Discussions in 2014

Mesoscale Discussion 739

May 27, 201410 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 27, 2014, 8:03 PM CDT for 10 counties in Texas. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
May 27, 2014, 8:03 PM CDT (01:03 UTC)
Expired
May 27, 2014, 9:00 PM CDT
In force
57 min
Issued by
the Storm Prediction Center

Counties Bell County, TX, Bosque County, TX, Burnet County, TX, Coryell County, TX, Falls County, TX, Hamilton County, TX, Hill County, TX, Lampasas County, TX, McLennan County, TX, Mills County, TX

The radar

The Ft Hood radar (KGRK), 81 km from the middle of the area, began a volume at 01:05 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, 1.1 hours before the alert went out and 192 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 2014-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 436 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 2014-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 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
436 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
875 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
210 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

402 
ACUS11 KWNS 280104
SWOMCD
SPC MCD 280103 
TXZ000-280200-

MESOSCALE DISCUSSION 0739
NWS STORM PREDICTION CENTER NORMAN OK
0803 PM CDT TUE MAY 27 2014

AREAS AFFECTED...SRN PORTION OF NCNTRL TX

CONCERNING...SEVERE THUNDERSTORM WATCH 191...

VALID 280103Z - 280200Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 191
CONTINUES.

SUMMARY...SEVERE THREAT ACROSS NCNTRL TX AND REMAINING PART OF WW
191 IS EXPECTED TO CONTINUE TO DIMINISH. WW 191 IS SCHEDULED TO
EXPIRE AT 04Z BUT WILL LIKELY BE CANCELLED BEFORE 02Z.

DISCUSSION...WIDESPREAD CONVECTIVE OVERTURNING AND A STABILIZING
BOUNDARY LAYER HAVE RESULTED IN A GRADUAL DECREASE IN THUNDERSTORM
INTENSITY...AND RE-INTENSIFICATION IS NOT EXPECTED THIS EVENING.
THEREFORE...SEVERE THREAT SHOULD BECOME MORE MARGINAL WITH TIME.

..DIAL.. 05/28/2014

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

ATTN...WFO...FWD...EWX...SJT...

LAT...LON   30829892 31789852 32019706 31179686 30679775 30829892

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 27, 8:45 PM CDTMesoscale DiscussionSPCAtascosa, Bastrop, Bee, Bexar, Blanco, Caldwell and 16 more60 min
May 28, 2:50 AM CDTMesoscale DiscussionSPCChambers, Galveston, Harris85 min
May 28, 2:20 PM CDTMesoscale DiscussionSPCCameron, Hidalgo, Starr, Willacy115 min

Nearby

Mesoscale Discussions in Texas, 2014Every mesoscale discussion in 2014

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.