Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 670

May 9, 201711 counties in New Mexico; 20 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 9, 2017, 1:16 PM MDT for 11 counties in New Mexico; 20 counties in Texas. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: May 9, 2017, 1:16 PM MDT (19:16 UTC)
Expired: May 9, 2017, 3:15 PM MDT
In force: 119 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 31 counties

Chaves County, NM, Curry County, NM, De Baca County, NM, Eddy County, NM, Guadalupe County, NM, Harding County, NM, Lea County, NM, Lincoln County, NM, Quay County, NM, Roosevelt County, NM, San Miguel County, NM, Andrews County, TX, Bailey County, TX, Castro County, TX, Cochran County, TX, Crane County, TX, Deaf Smith County, TX, Ector County, TX, Gaines County, TX, Hale County, TX, Hockley County, TX, Lamb County, TX, Loving County, TX, Oldham County, TX, Parmer County, TX, Reeves County, TX, Swisher County, TX, Terry County, TX, Ward County, TX, Winkler County, TX, Yoakum County, TX

The radar

The Cannon AFB radar (KFDX), 74 km from the middle of the area, began a volume at 19:17 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.

Tornado Watch 200May 9, 2:20 PM MDT

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 7.3 hours before the alert went out and 234 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: 623 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 720 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

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 8, 6:30 PM MDT	Mesoscale Discussion	SPC	Chaves, Colfax, Curry, De Baca, Eddy, Guadalupe and 10 more	2 hr
May 8, 10:26 PM MDT	Mesoscale Discussion	SPC	Chaves, Colfax, Curry, De Baca, Eddy, Guadalupe and 9 more	64 min
May 9, 9:55 AM MDT	Mesoscale Discussion	SPC	Colfax, Lincoln, Los Alamos, Mora, San Miguel, Santa Fe and 2 more	3 hr
May 9, 11:15 AM MDT	Severe Thunderstorm Watch	SPC	Bernalillo, Colfax, De Baca, Guadalupe, Harding, Lincoln and 9 more	9 hr
May 9, 2:23 PM MDT	Tornado Watch	SPC	Chaves, Curry, De Baca, Eddy, Guadalupe, Harding and 6 more	8 hr
May 9, 5:12 PM MDT	Mesoscale Discussion	SPC	Chaves, Curry, De Baca, Guadalupe, Harding, Lea and 2 more	93 min
May 9, 5:24 PM MDT	Mesoscale Discussion	SPC	Colfax, Los Alamos, Mora, Rio Arriba, Sandoval, San Miguel and 3 more	66 min

Nearby

Mesoscale Discussions in Texas, 2017 Mesoscale Discussions in New Mexico, 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.