Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 884

May 27, 20176 counties in Oklahoma; 7 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 27, 2017, 9:07 PM CDT for 6 counties in Oklahoma; 7 counties in Texas. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: May 27, 2017, 9:07 PM CDT (02:07 UTC)
Expired: May 27, 2017, 10:00 PM CDT
In force: 53 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Beaver County, OK, Dewey County, OK, Ellis County, OK, Harper County, OK, Roger Mills County, OK, Woodward County, OK, Hansford County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Ochiltree County, TX, Roberts County, TX, Sherman County, TX

The radar

The Amarillo radar (KAMA), 137 km from the middle of the area, began a volume at 02:09 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.

Severe Thunderstorm Watch 286May 27, 9:40 PM CDT

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 2.1 hours before the alert went out and 136 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: 322 J/kg
Mixed-layer CIN: -119 J/kg
Mixed-layer LCL: 2500 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 265 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 27, 7:12 PM CDT	Mesoscale Discussion	SPC	Beaver, Cimarron, Texas	2 hr
May 27, 8:07 PM CDT	Mesoscale Discussion	SPC	Caddo, Canadian, Carter, Cherokee, Cleveland, Coal and 33 more	83 min
May 27, 9:39 PM CDT	Severe Thunderstorm Watch	SPC	Beckham, Blaine, Custer, Dewey, Ellis, Garfield and 9 more	4 hr
May 27, 10:43 PM CDT	Mesoscale Discussion	SPC	Kingfisher, Major, Woodward	32 min
May 27, 11:47 PM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 17 more	58 min
May 28, 12:06 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Cherokee, Choctaw, Delaware, Haskell, Latimer and 10 more	5 hr
May 28, 12:52 AM CDT	Mesoscale Discussion	SPC	McCurtain	23 min
May 28, 2:53 AM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Choctaw, Haskell, Latimer, LeFlore and 6 more	2 hr
May 28, 4:59 AM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Collin, Delta, Denton and 7 more	2 hr
May 28, 1:34 PM CDT	Mesoscale Discussion	SPC	Bastrop, Bell, Bexar, Blanco, Burnet, Caldwell and 18 more	56 min
May 28, 3:09 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Atascosa, Austin, Bandera, Bastrop, Bell and 58 more	8 hr
May 28, 5:01 PM CDT	Mesoscale Discussion	SPC	Gregg, Harrison, Marion, Nacogdoches, Panola, Rusk and 1 more	59 min
May 28, 5:19 PM CDT	Severe Thunderstorm Watch	SPC	Angelina, Cherokee, Gregg, Harrison, Marion, Nacogdoches and 6 more	4 hr
May 28, 6:03 PM CDT	Mesoscale Discussion	SPC	Anderson, Bandera, Bastrop, Bell, Bexar, Blanco and 40 more	57 min

Nearby

Mesoscale Discussions in Texas, 2017 Mesoscale Discussions in Oklahoma, 2017 Every 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.