Alert archive / Wyoming / Winter Storm Warnings in 2020

Winter Storm Warning 3, NWS Riverton, WY

February 5, 202010 counties in Wyoming

NWS Riverton, WY issued this winter storm warning at Feb 5, 2020, 3:41 AM MST for 10 counties in Wyoming. It took effect at Feb 5, 2020, 5:00 PM MST. It was in force for 42 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: Feb 5, 2020, 3:41 AM MST (10:41 UTC)
In effect from: Feb 5, 2020, 5:00 PM MST
Expired: Feb 7, 2020, 11:00 AM MST
In force: 42 hr
Issued by: NWS Riverton, WY

Counties Big Horn County, WY, Fremont County, WY, Hot Springs County, WY, Johnson County, WY, Lincoln County, WY, Natrona County, WY, Park County, WY, Sublette County, WY, Teton County, WY, Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 58 km from the middle of the area, began a volume at 10:41 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 00:00Z, 10.7 hours before the alert went out and 60 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: 1466 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 73 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 Riverton, WY wrote its last area forecast discussion before this winter storm warning went out at Feb 5, 3:06 AM MST, 35 minutes earlier.

Area forecast discussion, Feb 5, 3:06 AM MST, 35 minutes before

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Hazardous weather outlook, Feb 4, 7:11 PM MST, 8 hours 30 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 5, 5:09 AM MST	Winter Weather Advisory	RIW	Big Horn, Hot Springs, Johnson, Lincoln, Natrona, Park and 2 more	54 hr
Feb 5, 11:34 AM MST	High Wind Warning	RIW	Sweetwater	53 hr
Feb 5, 3:24 PM MST	Winter Weather Advisory	RIW	Lincoln, Park	44 hr

Nearby

Winter Storm Warnings in Wyoming, 2020 Every winter storm warning 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.