Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 526

May 25, 20188 counties in Oklahoma; 14 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 25, 2018, 9:17 PM CDT for 8 counties in Oklahoma; 14 counties in Texas. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: May 25, 2018, 9:17 PM CDT (02:17 UTC)
Expired: May 25, 2018, 10:45 PM CDT
In force: 88 min
Issued by: the Storm Prediction Center

All 22 counties

Beckham County, OK, Comanche County, OK, Cotton County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kiowa County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Childress County, TX, Clay County, TX, Collingsworth County, TX, Foard County, TX, Hardeman County, TX, Haskell County, TX, Jack County, TX, Knox County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 44 km from the middle of the area, began a volume at 02:16 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 2.3 hours before the alert went out and 226 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: 243 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 3788 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 15 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.

Issued	Product	Office	Counties	Lasted
May 25, 8:53 PM CDT	Mesoscale Discussion	SPC	Burnet, Gillespie, Kimble, Lampasas, Llano, McCulloch and 3 more	67 min
May 26, 11:58 AM CDT	Mesoscale Discussion	SPC	Jasper, Newton, Sabine, San Augustine, Tyler	3 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.