Alert archive / Wyoming / Winter Storm Watches in 2020

Winter Storm Watch 2, NWS Cheyenne, WY

January 31, 20207 counties in Wyoming; Sioux County, Nebraska

NWS Cheyenne, WY issued this winter storm watch at Jan 31, 2020, 1:39 PM MST for 7 counties in Wyoming; Sioux County, Nebraska. It took effect at Feb 2, 2020, 8:00 PM MST. It was in force for .

The area

The counties it named.

The facts

Issued: Jan 31, 2020, 1:39 PM MST (20:39 UTC)
In effect from: Feb 2, 2020, 8:00 PM MST
Expired: Feb 2, 2020, 2:17 AM MST
In force
Issued by: NWS Cheyenne, WY

Counties Sioux County, NE, Albany County, WY, Carbon County, WY, Converse County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 115 km from the middle of the area, began a volume at 20:41 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

Riverton, WY (KRIW), launched 12:00Z, 8.7 hours before the alert went out and 292 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: 2605 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 295 m²/s²
0-3 km storm-relative helicity: 307 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 watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Cheyenne, WY wrote its last area forecast discussion before this winter storm watch went out at Jan 31, 10:45 AM MST, 2 hours 54 minutes earlier.

Area forecast discussion, Jan 31, 10:45 AM MST, 2 hours 54 minutes before

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Hazardous weather outlook, Jan 31, 3:46 AM MST, 9 hours 53 minutes before

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In the hours before

Special weather statement, Jan 31, 8:59 AM MST, 4 hours 40 minutes before

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Local storm report, Jan 31, 9:13 AM MST, 4 hours 26 minutes before

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Local storm report, Jan 31, 9:15 AM MST, 4 hours 24 minutes before

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Local storm report, Jan 31, 9:16 AM MST, 4 hours 23 minutes before

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Local storm report, Jan 31, 9:46 AM MST, 3 hours 53 minutes before

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Local storm report, Jan 31, 11:13 AM MST, 2 hours 26 minutes before

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The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 30, 5:32 PM MST	Snow Squall Warning	CYS	Laramie	43 min
Jan 30, 6:15 PM MST	Snow Squall Warning	CYS	Albany, Laramie	45 min
Jan 31, 2:01 AM MST	High Wind Warning	CYS	Albany, Carbon, Laramie, Platte	56 hr

Nearby

Winter Storm Watches in Wyoming, 2020 Winter Storm Watches in Nebraska, 2020 Every winter storm watch in 2020

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.