Alert archive / Utah / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 1, NWS Grand Junction, CO

May 14, 2015San Juan County, Utah

NWS Grand Junction, CO issued this severe thunderstorm warning at May 14, 2015, 2:40 PM MDT for San Juan County, Utah. It was in force for 17 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 14, 2015, 2:40 PM MDT (20:40 UTC)
Expired: May 14, 2015, 2:57 PM MDT
In force: 17 min
Issued by: NWS Grand Junction, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County San Juan County, UT

The radar

The Grand Junction radar (KGJX), 212 km from the middle of the area, began a volume at 20:40 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 nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 8.7 hours before the alert went out and 202 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2930 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Grand Junction, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at May 14, 11:42 AM MDT, 2 hours 58 minutes earlier.

Area forecast discussion, May 14, 11:42 AM MDT, 2 hours 58 minutes before

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Hazardous weather outlook, May 14, 3:59 AM MDT, 10 hours 41 minutes before

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In the hours before

Special weather statement, May 14, 1:50 PM MDT, 50 minutes before

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Special weather statement, May 14, 2:01 PM MDT, 39 minutes before

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Special weather statement, May 14, 2:29 PM MDT, 11 minutes before

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The office that day

Everything else NWS Grand Junction, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 14, 2:01 PM MDT	Special Weather Statement	GJT		29 min
May 14, 2:29 PM MDT	Special Weather Statement	GJT		31 min
May 14, 2:58 PM MDT	Winter Storm Warning	GJT	Archuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 9 more	51 hr
May 14, 2:58 PM MDT	Winter Weather Advisory	GJT	Archuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 12 more	66 hr
May 14, 5:23 PM MDT	Special Weather Statement	GJT	La Plata	52 min
May 14, 5:33 PM MDT	Special Weather Statement	GJT	La Plata	42 min
May 14, 1:50 PM MDT	Special Weather Statement	GJT	San Juan	40 min
May 14, 2:43 PM MDT	Special Weather Statement	GJT	San Juan	32 min

Nearby

Severe Thunderstorm Warnings in Utah, 2015 Every severe thunderstorm warning in 2015

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.