Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 5

January 2, 201750 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jan 2, 2017, 3:36 AM CST for 50 counties in Texas. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued
Jan 2, 2017, 3:36 AM CST (09:36 UTC)
Expired
Jan 2, 2017, 4:30 AM CST
In force
54 min
Issued by
the Storm Prediction Center
All 50 counties

Anderson County, TX, Bastrop County, TX, Bell County, TX, Blanco County, TX, Bosque County, TX, Brazos County, TX, Burleson County, TX, Burnet County, TX, Caldwell County, TX, Collin County, TX, Comal County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Fayette County, TX, Freestone County, TX, Gillespie County, TX, Grimes County, TX, Hamilton County, TX, Hays County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lampasas County, TX, Lee County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, McLennan County, TX, Milam County, TX, Navarro County, TX, Parker County, TX, Rains County, TX, Robertson County, TX, Rockwall County, TX, Somervell County, TX, Tarrant County, TX, Travis County, TX, Van Zandt County, TX, Walker County, TX, Washington County, TX, Williamson County, TX, Wise County, TX

The radar

The Ft Hood radar (KGRK), 72 km from the middle of the area, began a volume at 09:39 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, 9.6 hours before the alert went out and 164 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 2017-01-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2017-01-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 98 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1528 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
98 m²/s²
0-3 km storm-relative helicity
160 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

263 
ACUS11 KWNS 020937
SWOMCD
SPC MCD 020936 
TXZ000-021030-

Mesoscale Discussion 0005
NWS Storm Prediction Center Norman OK
0336 AM CST Mon Jan 02 2017

Areas affected...Parts of central and east TX

Concerning...Severe Thunderstorm Watch 1...

Valid 020936Z - 021030Z

The severe weather threat for Severe Thunderstorm Watch 1 continues.

SUMMARY...While thunderstorms have been generally sub-severe so far,
there should be an increasing severe threat as they move eastward
across Severe Thunderstorm Watch 1.

DISCUSSION...Radar trends over the past hour have shown convection
along and behind a cold front across central TX generally remaining
sub-severe. This is primarily due to the strongest cores lagging the
surface front (evident as a radar fine line) and being slightly
elevated. One exception to this is a bowing segment moving across
Erath and Hamilton counties in central TX as of 0935Z. This line
segment will remain capable of producing large hail and damaging
winds (recently reported up to 70 mph in Hamilton, TX) over the next
hour. An increasingly moist and unstable environment downstream of
the front (into east TX) remains favorable for intensification of
ongoing thunderstorms, and additional development along the front
itself. All severe hazards will be possible, although damaging winds
should tend to become the primary threat with time as convection
likely consolidates into a line.

..Gleason.. 01/02/2017

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

ATTN...WFO...HGX...FWD...EWX...

LAT...LON   30159928 30919838 32019832 33599776 33529547 32989572
            31789551 30579541 29639682 29609763 30159928

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 1, 10:11 PM CSTMesoscale DiscussionSPCArcher, Baylor, Bosque, Brown, Callahan, Coleman and 35 more3 hr
Jan 2, 1:04 AM CSTMesoscale DiscussionSPCAnderson, Austin, Bandera, Bastrop, Bell, Bexar and 71 more86 min
Jan 2, 1:39 AM CSTSevere Thunderstorm WatchSPCAnderson, Austin, Bastrop, Bell, Blanco, Bosque and 67 more59 days
Jan 2, 2:06 AM CSTMesoscale DiscussionSPCJasper, Newton, Orange, Sabine, San Augustine, Shelby and 1 more114 min
Jan 2, 5:35 AM CSTMesoscale DiscussionSPCAnderson, Angelina, Austin, Brazos, Burleson, Camp and 56 more85 min
Jan 2, 6:12 AM CSTTornado WatchSPCAngelina, Bowie, Camp, Cass, Cherokee, Franklin and 21 more10 hr
Jan 2, 7:48 AM CSTMesoscale DiscussionSPCAngelina, Bowie, Camp, Cass, Chambers, Cherokee and 25 more57 min

Nearby

Mesoscale Discussions in Texas, 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.