Alert archive / Wyoming / Winter Storm Warnings in 2018

Winter Storm Warning 12, NWS Riverton, WY

November 3, 20184 counties in Wyoming

NWS Riverton, WY issued this winter storm warning at Nov 3, 2018, 1:52 PM MDT for 4 counties in Wyoming. It took effect at Nov 4, 2018, 5:00 AM MST. It was in force for 15 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: Nov 3, 2018, 1:52 PM MDT (19:52 UTC)
In effect from: Nov 4, 2018, 5:00 AM MST
Expired: Nov 4, 2018, 8:22 PM MST
In force: 15 hr
Issued by: NWS Riverton, WY

Counties Fremont County, WY, Lincoln County, WY, Sublette County, WY, Teton County, WY

The radar

The Riverton/Lander radar (KRIW), 120 km from the middle of the area, began a volume at 19:54 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

Salt Lake City I, UT (KSLC), launched 12:00Z, 7.9 hours before the alert went out and 295 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: 1694 m above ground
0-6 km bulk shear: 92 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 182 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 Riverton, WY wrote its last area forecast discussion before this winter storm warning went out at Nov 2, 1:58 PM MDT, 23 hours 54 minutes earlier.

Area forecast discussion, Nov 2, 1:58 PM MDT, 23 hours 54 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 2, 6:09 PM MDT	Special Weather Statement	RIW		36 min
Nov 3, 1:52 PM MDT	Winter Weather Advisory	RIW	Fremont, Hot Springs, Lincoln, Park, Teton	32 hr

Nearby

Winter Storm Warnings in Wyoming, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.