Alert archive / Colorado / Winter Storm Warnings in 2018

Winter Storm Warning 5, NWS Grand Junction, CO

February 14, 201810 counties in Colorado

NWS Grand Junction, CO issued this winter storm warning at Feb 14, 2018, 3:39 AM MST for 10 counties in Colorado. It took effect at Feb 14, 2018, 6:00 PM MST. It was in force for 30 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Feb 14, 2018, 3:39 AM MST (10:39 UTC)
In effect from
Feb 14, 2018, 6:00 PM MST
Expired
Feb 16, 2018, 12:00 AM MST
In force
30 hr
Issued by
NWS Grand Junction, CO

Counties Delta County, CO, Eagle County, CO, Garfield County, CO, Gunnison County, CO, Mesa County, CO, Moffat County, CO, Montrose County, CO, Pitkin County, CO, Rio Blanco County, CO, Routt County, CO

The radar

The Grand Junction radar (KGJX), 64 km from the middle of the area, began a volume at 10:40 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

Denver, CO (KDEN), launched 00:00Z, 10.7 hours before the alert went out and 382 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-pSkew-T log-p diagram, Denver, CO at 00:00Z on 2018-02-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2018-02-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 54 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
2631 m above ground
0-6 km bulk shear
67 kt
0-1 km storm-relative helicity
54 m²/s²
0-3 km storm-relative helicity
286 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 13, 9:52 PM MSTWinter Storm WatchGJTDelta, Eagle, Garfield, Gunnison, Mesa, Moffat and 4 more6 hr
Feb 14, 3:39 AM MSTWinter Weather AdvisoryGJTArchuleta, Delta, Dolores, Garfield, Gunnison, Hinsdale and 10 more44 hr
Feb 14, 4:48 AM MSTDense Fog AdvisoryGJTGarfield, Mesa7 hr

Nearby

Winter Storm Warnings in Colorado, 2018Every winter storm warning 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.