Alert archive / Nebraska / Winter Storm Watches in 2018

Winter Storm Watch 8, NWS Cheyenne, WY

April 10, 2018Niobrara County, Wyoming; 6 counties in Nebraska

NWS Cheyenne, WY issued this winter storm watch at Apr 10, 2018, 2:45 PM MDT for Niobrara County, Wyoming; 6 counties in Nebraska. It took effect at Apr 13, 2018, 12:00 AM MDT. It was in force for .

The area

The counties it named.

The facts

Issued: Apr 10, 2018, 2:45 PM MDT (20:45 UTC)
In effect from: Apr 13, 2018, 12:00 AM MDT
Expired: Apr 12, 2018, 12:22 PM MDT
In force
Issued by: NWS Cheyenne, WY

Counties Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Morrill County, NE, Scotts Bluff County, NE, Sioux County, NE, Niobrara County, WY

The radar

The Cheyenne radar (KCYS), 160 km from the middle of the area, began a volume at 20:48 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 8.8 hours before the alert went out and 264 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: 1600 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 117 m²/s²
0-3 km storm-relative helicity: 219 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 Apr 10, 2:42 PM MDT, 3 minutes earlier.

Area forecast discussion, Apr 10, 2:42 PM MDT, 3 minutes before

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Hazardous weather outlook, Apr 10, 4:01 AM MDT, 10 hours 44 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
Apr 10, 3:10 AM MDT	Fire Weather Watch	CYS		23 hr
Apr 10, 2:42 PM MDT	High Wind Watch	CYS	Albany, Carbon, Laramie, Platte	5 hr

Nearby

Winter Storm Watches in Nebraska, 2018 Winter Storm Watches in Wyoming, 2018 Every winter storm watch 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.