Alert archive / Wyoming / Winter Storm Warnings in 2018
Winter Storm Warning 8, NWS Riverton, WY
NWS Riverton, WY issued this winter storm warning at Apr 1, 2018, 12:51 PM MDT for 7 counties in Wyoming. It took effect at Apr 1, 2018, 6:00 PM MDT. It was in force for 34 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
- Apr 1, 2018, 12:51 PM MDT (18:51 UTC)
- In effect from
- Apr 1, 2018, 6:00 PM MDT
- Expired
- Apr 3, 2018, 3:47 AM MDT
- In force
- 34 hr
- Issued by
- NWS Riverton, WY
Counties Fremont County, WY, Hot Springs County, WY, Johnson County, WY, Lincoln County, WY, Park County, WY, Sublette County, WY, Teton County, WY
The radar
The Riverton/Lander radar (KRIW), 74 km from the middle of the area, began a volume at 18:57 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, 6.9 hours before the alert went out and 79 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 687 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 274 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Apr 1, 10:55 AM MDT, 1 hour 56 minutes earlier.
Area forecast discussion, Apr 1, 10:55 AM MDT, 1 hour 56 minutes before
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</html>Hazardous weather outlook, Apr 1, 3:12 AM MDT, 9 hours 39 minutes before
Hazardous Weather Outlook National Weather Service Riverton WY 312 AM MDT Sun Apr 1 2018 WYZ001>020-022>030-021100- Yellowstone National Park-Absaroka Mountains-Cody Foothills- North Big Horn Basin-Southwest Big Horn Basin- Southeast Big Horn Basin-Owl Creek and Bridger Mountains- Bighorn Mountains West-Bighorn Mountains Southeast- Northeast Johnson County-Southeast Johnson County- Teton and Gros Ventre Mountains-Jackson Hole- Wind River Mountains West-Wind River Mountains East- Upper Wind River Basin-Wind River Basin-Lander Foothills- Green Mountains and Rattlesnake Range- Natrona County Lower Elevations-Casper Mountain-Star Valley- Salt River and Wyoming Ranges-Upper Green River Basin Foothills- Upper Green River Basin-South Lincoln County- Rock Springs and Green River-Flaming Gorge-East Sweetwater County- 312 AM MDT Sun Apr 1 2018 ...Winter Storm Watches in Effect for the Northern Mountains Tonight through Monday Evening... ...High Wind Watches in Effect for Portions of South and Central Wyoming Late Tonight through Monday Evening... This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight. Valley rain or a rain/snow mix and mountain snow will increase across western Wyoming tonight. Strong winds with gusts over 60 mph may develop down the east slopes of the Wind River Mountains into the Lander Foothills and South Pass area late tonight. .DAYS TWO THROUGH SEVEN...Monday through Saturday Monday and Monday night...A strong cold front will push across the area Monday. Snow, heavy at times, along with blowing and drifting snow is expected to impact much of western Wyoming Monday morning into the afternoon. Please see Winter Storm Watches for more information. High winds are possible across portions of central and southern Wyoming, including the Interstate 80 corridor, through Monday evening. Please see High Wind Watches for the latest information. .SPOTTER INFORMATION STATEMENT... Please report snow amounts,wind gusts over 50 mph, or any wind damage. Thank you.
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 1, 3:34 AM MDT | Winter Storm Watch | RIW | Big Horn, Fremont, Hot Springs, Johnson, Lincoln, Natrona and 4 more | 23 hr |
| Apr 1, 3:51 AM MDT | High Wind Watch | RIW | Big Horn, Fremont, Johnson, Lincoln, Natrona, Park and 2 more | 22 hr |
| Apr 1, 12:48 PM MDT | High Wind Warning | RIW | Big Horn, Fremont, Johnson, Lincoln, Natrona, Park and 2 more | 31 hr |
Nearby
Winter Storm Warnings in Wyoming, 2018Every 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.