Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 177

March 26, 2018Cotton County, Oklahoma; 5 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 26, 2018, 3:31 PM CDT for Cotton County, Oklahoma; 5 counties in Texas. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Mar 26, 2018, 3:31 PM CDT (20:31 UTC)
Expired: Mar 26, 2018, 4:30 PM CDT
In force: 59 min
Issued by: the Storm Prediction Center

Counties Cotton County, OK, Archer County, TX, Baylor County, TX, Fisher County, TX, Haskell County, TX, Wichita County, TX

The radar

The Altus AFB radar (KFDR), 84 km from the middle of the area, began a volume at 20:33 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 12:00Z, 8.5 hours before the alert went out and 175 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: 215 J/kg
Mixed-layer CIN: -417 J/kg
Mixed-layer LCL: 624 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 278 m²/s²
0-3 km storm-relative helicity: 214 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.9

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.

Issued	Product	Office	Counties	Lasted
Mar 25, 7:31 PM CDT	Mesoscale Discussion	SPC	Love	59 min
Mar 26, 12:07 PM CDT	Mesoscale Discussion	SPC	Comanche, Cotton, Grady, Jefferson, Stephens, Tillman	2 hr
Mar 26, 12:37 PM CDT	Severe Thunderstorm Watch	SPC	Carter, Cleveland, Comanche, Cotton, Garvin, Grady and 11 more	8 hr
Mar 26, 6:53 PM CDT	Mesoscale Discussion	SPC	Carter, Cotton, Jefferson, Love, Marshall	2 hr
Mar 26, 2:11 PM CDT	Mesoscale Discussion	SPC	Coke, Crockett, Glasscock, Irion, Pecos, Reagan and 4 more	2 hr
Mar 26, 2:56 PM CDT	Severe Thunderstorm Watch	SPC	Callahan, Coke, Crane, Crockett, Fisher, Glasscock and 19 more	11 hr
Mar 26, 5:44 PM CDT	Mesoscale Discussion	SPC	Coke, Crane, Crockett, Glasscock, Irion, Midland and 9 more	2 hr

Nearby

Mesoscale Discussions in Texas, 2018 Mesoscale Discussions in Oklahoma, 2018 Every mesoscale discussion in 2018

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.