Alert archive / Colorado / Winter Storm Warnings in 2018

Winter Storm Warning 8, NWS Grand Junction, CO

April 7, 20189 counties in Colorado

NWS Grand Junction, CO issued this winter storm warning at Apr 7, 2018, 4:19 AM MDT for 9 counties in Colorado. It took effect at Apr 7, 2018, 9:00 PM MDT. It was in force for 12 hr. 5 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Apr 7, 2018, 4:19 AM MDT (10:19 UTC)
In effect from: Apr 7, 2018, 9:00 PM MDT
Expired: Apr 8, 2018, 9:00 AM MDT
In force: 12 hr
Issued by: NWS Grand Junction, CO

Counties Delta County, CO, Eagle County, CO, Garfield County, CO, Gunnison 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), 74 km from the middle of the area, began a volume at 10:19 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.

What was reported inside it

Time	Report	Where	Remark
Apr 8, 7:00 AM MDT	SNOW 6	Gothic, CO	CO-OP OBSERVER STATION GTHC2, GOTHIC.
Apr 8, 7:04 AM MDT	HEAVY SNOW 11.2	2 Ssw Snowmass Village, CO	FROM 1.24 OF WATER.
Apr 8, 8:00 AM MDT	SNOW 1.3	Oak Creek 5wnw, CO
Apr 8, 8:06 AM MDT	SNOW 6	Taylor Park 6se, CO
Apr 8, 8:50 AM MDT	SNOW 1.5	Avon 2n, CO	WATER EQUIVALENT (INCLUDING RAINFALL): 0.99 INCHES.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 10.3 hours before the alert went out and 373 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: 778 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 159 m²/s²
0-3 km storm-relative helicity: 397 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 Apr 6, 11:34 PM MDT, 4 hours 45 minutes earlier.

Area forecast discussion, Apr 6, 11:34 PM MDT, 4 hours 45 minutes before

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Hazardous weather outlook, Apr 6, 4:59 AM MDT, 23 hours 20 minutes before

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Nearby

Winter Storm Warnings in Colorado, 2018 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.