Alert archive / Colorado / Winter Storm Warnings in 2017

Winter Storm Warning 1, NWS Grand Junction, CO

January 2, 201718 counties in Colorado

NWS Grand Junction, CO issued this winter storm warning at Jan 2, 2017, 11:24 PM MST for 18 counties in Colorado. It was in force for 3 days. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jan 2, 2017, 11:24 PM MST (06:24 UTC)
Expired: Jan 6, 2017, 4:28 AM MST
In force: 3 days
Issued by: NWS Grand Junction, CO

Counties Archuleta County, CO, Delta County, CO, Dolores County, CO, Eagle County, CO, Garfield County, CO, Gunnison County, CO, Hinsdale County, CO, La Plata County, CO, Mesa County, CO, Moffat County, CO, Montezuma County, CO, Montrose County, CO, Ouray County, CO, Pitkin County, CO, Rio Blanco County, CO, Routt County, CO, San Juan County, CO, San Miguel County, CO

The radar

The Grand Junction radar (KGJX), 60 km from the middle of the area, began a volume at 06:22 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 00:00Z, 6.4 hours before the alert went out and 83 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: 22 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 1663 m above ground
0-6 km bulk shear: 76 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 217 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 winter storm 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 winter storm warning went out at Jan 2, 10:46 PM MST, 38 minutes earlier.

Area forecast discussion, Jan 2, 10:46 PM MST, 38 minutes before

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Hazardous weather outlook, Jan 2, 5:33 AM MST, 17 hours 51 minutes before

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In the hours before

Local storm report, Jan 2, 8:44 PM MST, 2 hours 40 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
Jan 2, 11:24 PM MST	Winter Storm Watch	GJT	Archuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 12 more	16 hr
Jan 3, 5:51 AM MST	Winter Weather Advisory	GJT	Eagle, Garfield, Moffat, Rio Blanco, Routt	6 hr
Jan 3, 3:42 PM MST	Winter Storm Watch	GJT	Archuleta, Delta, Garfield, Gunnison, Mesa, Montrose	13 hr
Jan 3, 3:42 PM MST	Winter Weather Advisory	GJT	Delta, Dolores, Garfield, Gunnison, La Plata, Mesa and 5 more	58 hr

Nearby

Winter Storm Warnings in Colorado, 2017 Every winter storm warning 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.