Alert archive / Wyoming / Winter Storm Warnings in 2018
Winter Storm Warning 14, NWS Riverton, WY
NWS Riverton, WY issued this winter storm warning at Dec 11, 2018, 11:21 AM MST for 4 counties in Wyoming. It took effect at Dec 11, 2018, 11:00 PM MST. It was in force for 16 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
- Dec 11, 2018, 11:21 AM MST (18:21 UTC)
- In effect from
- Dec 11, 2018, 11:00 PM MST
- Expired
- Dec 12, 2018, 3:16 PM MST
- In force
- 16 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 18:24 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
Elko, NV (KLKN), launched 12:00Z, 6.4 hours before the alert went out and 424 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
- 677 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 35 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 Dec 11, 9:53 AM MST, 1 hour 28 minutes earlier.
Area forecast discussion, Dec 11, 9:53 AM MST, 1 hour 28 minutes before
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</html>Hazardous weather outlook, Dec 11, 2:52 AM MST, 8 hours 29 minutes before
Hazardous Weather Outlook National Weather Service Riverton WY 252 AM MST Tue Dec 11 2018 WYZ001>020-022>030-121000- 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- 252 AM MST Tue Dec 11 2018 ...High Wind Warning for Cody Foothills from 2 PM Today until 5 AM Wednesday... ...High Wind Warning for Southeast Fremont and Natrona Counties from 11 PM Tuesday night until 2 PM Wednesday... ...Winter Storm Watch Teton and Gros Ventre Ranges late Tuesday Night and Wednesday... ...High Wind Watch for the WInd River Basin and Northeast Johnson County Late Wednesday Evening through Thursday Morning... This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight. Strong winds developing across the Cody Foothills late this afternoon through this evening. Strong southwest winds developing from southeast Fremont County through the Casper area late tonight. Please see High Wind Warnings for details. Snow increasing across the western mountains and Far West valleys tonight. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Wednesday...Significant snow expected in the far west mountains and valleys along with gusty to strong wind. A period of very strong wind and snow along the Interstate 80 corridor. A chance of snow showers with brief heavy snow showers possible across central Wyoming. Wednesday night and Thursday morning...Strong northwest wind possible across the Wind River Basin and northeast Johnson County including Interstates 25 and 90. .SPOTTER INFORMATION STATEMENT... Please report wind gusts over 50 mph and any snow amounts.
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 11, 2:52 AM MST | High Wind Watch | RIW | Fremont, Johnson | 24 hr |
| Dec 11, 2:52 AM MST | High Wind Warning | RIW | Fremont, Hot Springs, Johnson, Natrona, Park, Sweetwater | 42 hr |
| Dec 11, 11:21 AM MST | Winter Weather Advisory | RIW | Lincoln, Park, Sublette, Teton | 28 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.