Alert archive / New Mexico / Mesoscale Discussions in 2018

Mesoscale Discussion 480

May 21, 20184 counties in Colorado; 9 counties in New Mexico

The Storm Prediction Center issued this mesoscale discussion at May 21, 2018, 11:41 AM MDT for 4 counties in Colorado; 9 counties in New Mexico. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 21, 2018, 11:41 AM MDT (17:41 UTC)
Expired: May 21, 2018, 1:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Archuleta County, CO, Conejos County, CO, Mineral County, CO, Rio Grande County, CO, Bernalillo County, NM, Cibola County, NM, Los Alamos County, NM, Rio Arriba County, NM, Sandoval County, NM, Sierra County, NM, Socorro County, NM, Taos County, NM, Valencia County, NM

The radar

The Albuquerque radar (KABX), 40 km from the middle of the area, began a volume at 17:40 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 112May 21, 1:00 PM MDT

The nearest sounding before it

Albuquerq/Krtlnd, NM (KABQ), launched 12:00Z, 5.7 hours before the alert went out and 63 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: 272 J/kg
Mixed-layer CIN: -119 J/kg
Mixed-layer LCL: 1660 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 133 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 21, 3:00 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Denver, Kit Carson, Logan, Morgan and 3 more	2 hr
May 21, 12:59 PM MDT	Severe Thunderstorm Watch	SPC	Bernalillo, Cibola, Lincoln, Los Alamos, McKinley, Rio Arriba and 6 more	6 hr
May 21, 2:29 PM MDT	Mesoscale Discussion	SPC	Bernalillo, Lincoln, Los Alamos, Rio Arriba, Sandoval, Santa Fe and 3 more	2 hr
May 21, 4:56 PM MDT	Mesoscale Discussion	SPC	Bernalillo, Chaves, Colfax, De Baca, Doña Ana, Guadalupe and 13 more	64 min
May 21, 5:44 PM MDT	Severe Thunderstorm Watch	SPC	Chaves, De Baca, Guadalupe, Lincoln, Otero, Torrance	5 hr

Nearby

Mesoscale Discussions in New Mexico, 2018 Mesoscale Discussions in Colorado, 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.