Alert archive / Texas / Mesoscale Discussions in 2020

Mesoscale Discussion 445

April 22, 20204 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2020, 5:53 PM CDT for 4 counties in Texas. It was in force for 37 min.

The area

The outline as issued.

The facts

Issued
Apr 22, 2020, 5:53 PM CDT (22:53 UTC)
Expired
Apr 22, 2020, 6:30 PM CDT
In force
37 min
Issued by
the Storm Prediction Center

Counties Angelina County, TX, Polk County, TX, Trinity County, TX, Tyler County, TX

The radar

The Ft Polk radar (KPOE), 162 km from the middle of the area, began a volume at 22:56 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 10.9 hours before the alert went out and 167 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, Lake Charles Mun, LA at 12:00Z on 2020-04-22Temperature 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, Lake Charles Mun, LA at 12:00Z on 2020-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 191 square meters per square second.1939587897Sfc1 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
1543 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
191 m²/s²
0-3 km storm-relative helicity
385 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Apr 21, 8:12 PM CDTMesoscale DiscussionSPCHemphill, Lipscomb, Wheeler63 min
Apr 22, 1:21 AM CDTMesoscale DiscussionSPCFannin, Lamar, Red River84 min
Apr 22, 1:46 AM CDTSevere Thunderstorm WatchSPCFannin, Lamar, Red River4 hr
Apr 22, 2:16 AM CDTMesoscale DiscussionSPCCarson, Dallam, Hansford, Hartley, Hemphill, Hutchinson and 7 more119 min
Apr 22, 10:38 AM CDTMesoscale DiscussionSPCAnderson, Angelina, Austin, Bastrop, Bell, Blanco and 50 more2 hr
Apr 22, 10:55 AM CDTTornado WatchSPCAnderson, Angelina, Austin, Bastrop, Brazos, Burleson and 31 more6 hr
Apr 22, 1:10 PM CDTMesoscale DiscussionSPCAnderson, Angelina, Austin, Bastrop, Bell, Brazos and 35 more65 min
Apr 22, 1:12 PM CDTMesoscale DiscussionSPCClay, Collin, Cooke, Dallas, Delta, Denton and 15 more63 min
Apr 22, 2:33 PM CDTTornado WatchSPCCollin, Cooke, Dallas, Delta, Denton, Fannin and 12 more6 hr
Apr 22, 2:53 PM CDTMesoscale DiscussionSPCAnderson, Angelina, Cherokee, Houston, Nacogdoches, Panola and 5 more67 min
Apr 22, 4:24 PM CDTMesoscale DiscussionSPCAngelina, Brazos, Cherokee, Grimes, Hardin, Houston and 14 more96 min
Apr 22, 4:43 PM CDTMesoscale DiscussionSPCGrayson62 min
Apr 22, 4:47 PM CDTMesoscale DiscussionSPCAngelina, Polk, San Augustine, San Jacinto, Trinity, Tyler and 1 more88 min
Apr 22, 5:01 PM CDTTornado WatchSPCAngelina, Cherokee, Grimes, Harrison, Houston, Jasper and 14 more9 hr
Apr 22, 5:38 PM CDTMesoscale DiscussionSPCCamp, Collin, Dallas, Delta, Fannin, Franklin and 10 more97 min
Apr 22, 6:39 PM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Marion, Morris, Red River and 2 more66 min

Nearby

Mesoscale Discussions in Texas, 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.