Alert archive / Texas / Mesoscale Discussions in 2020

Mesoscale Discussion 11

January 10, 2020Bryan County, Choctaw County, Oklahoma; 25 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jan 10, 2020, 11:47 AM CST for Bryan County, Choctaw County, Oklahoma; 25 counties in Texas. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued
Jan 10, 2020, 11:47 AM CST (17:47 UTC)
Expired
Jan 10, 2020, 1:45 PM CST
In force
118 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 27 counties

Bryan County, OK, Choctaw County, OK, Bosque County, TX, Collin County, TX, Comanche County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Grayson County, TX, Hamilton County, TX, Hill County, TX, Hood County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Montague County, TX, Navarro County, TX, Parker County, TX, Rockwall County, TX, Somervell County, TX, Tarrant County, TX, Wise County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 57 km from the middle of the area, began a volume at 17:49 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 5.8 hours before the alert went out and 30 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 12:00Z on 2020-01-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 844 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 12:00Z on 2020-01-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 305 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
844 J/kg
Mixed-layer CIN
-83 J/kg
Mixed-layer LCL
727 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
305 m²/s²
0-3 km storm-relative helicity
327 m²/s²
Significant tornado parameter
1.1
Supercell composite
10.6

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 10, 6:30 AM CSTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 13 more60 min
Jan 10, 7:44 AM CSTSevere Thunderstorm WatchSPCAlfalfa, Blaine, Custer, Dewey, Garfield, Grant and 12 more67 days
Jan 10, 9:12 AM CSTMesoscale DiscussionSPCAlfalfa, Atoka, Blaine, Caddo, Canadian, Cherokee and 42 more93 min
Jan 10, 10:42 AM CSTTornado WatchSPCAdair, Atoka, Bryan, Carter, Cherokee, Choctaw and 38 more10 hr
Jan 10, 1:21 PM CSTMesoscale DiscussionSPCCaddo, Canadian, Comanche, Garfield, Grady, Grant and 2 more54 min
Jan 10, 1:44 PM CSTMesoscale DiscussionSPCAdair, Atoka, Bryan, Cherokee, Choctaw, Coal and 19 more91 min
Jan 10, 4:55 PM CSTMesoscale DiscussionSPCAtoka, Bryan, Choctaw, Haskell, Latimer, LeFlore and 2 more2 hr
Jan 10, 5:34 PM CSTTornado WatchSPCMcCurtain11 hr
Jan 10, 1:20 PM CSTTornado WatchSPCAnderson, Bell, Bosque, Collin, Cooke, Coryell and 33 more11 hr
Jan 10, 2:52 PM CSTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 17 more113 min
Jan 10, 2:59 PM CSTMesoscale DiscussionSPCBosque, Collin, Dallas, Delta, Denton, Ellis and 13 more2 hr
Jan 10, 3:30 PM CSTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bastrop, Bee, Bexar, Blanco and 26 more68 days

Nearby

Mesoscale Discussions in Texas, 2020Mesoscale Discussions in Oklahoma, 2020Every mesoscale discussion in 2020

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.