Alert archive / Wyoming / Winter Storm Watches in 2021
Winter Storm Watch 8, NWS Riverton, WY
NWS Riverton, WY issued this winter storm watch at Oct 9, 2021, 3:42 PM MDT for 11 counties in Wyoming. It took effect at Oct 11, 2021, 12:00 AM MDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Oct 9, 2021, 3:42 PM MDT (21:42 UTC)
- In effect from
- Oct 11, 2021, 12:00 AM MDT
- Expired
- Oct 10, 2021, 4:03 PM MDT
- In force
- 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, Sweetwater County, WY, Teton County, WY, Washakie County, WY
The radar
The Riverton/Lander radar (KRIW), 41 km from the middle of the area, began a volume at 21:43 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, 9.7 hours before the alert went out and 44 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
- 6 J/kg
- Mixed-layer CIN
- -71 J/kg
- Mixed-layer LCL
- 768 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 8 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 watch 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 watch went out at Oct 9, 11:54 AM MDT, 3 hours 48 minutes earlier.
Area forecast discussion, Oct 9, 11:54 AM MDT, 3 hours 48 minutes before
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</html>Hazardous weather outlook, Oct 9, 3:59 AM MDT, 11 hours 43 minutes before
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</html>Nearby
Winter Storm Watches in Wyoming, 2021Every winter storm watch in 2021
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.