Alert archive / Montana / Winter Storm Watches in 2021
Winter Storm Watch 2, NWS Billings, MT
NWS Billings, MT issued this winter storm watch at Apr 17, 2021, 2:09 AM MDT for 6 counties in Montana; Sheridan County, Wyoming. It took effect at Apr 18, 2021, 3:00 PM MDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Apr 17, 2021, 2:09 AM MDT (08:09 UTC)
- In effect from
- Apr 18, 2021, 3:00 PM MDT
- Expired
- Apr 17, 2021, 3:31 PM MDT
- In force
- Issued by
- NWS Billings, MT
Counties Big Horn County, MT, Carbon County, MT, Park County, MT, Stillwater County, MT, Sweet Grass County, MT, Wheatland County, MT, Sheridan County, WY
The radar
The Billings radar (KBLX), 46 km from the middle of the area, began a volume at 08:12 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, 8.2 hours before the alert went out and 281 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
- 769 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -24 m²/s²
- 0-3 km storm-relative helicity
- -18 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 Billings, MT wrote its last area forecast discussion before this winter storm watch went out at Apr 16, 8:34 PM MDT, 5 hours 35 minutes earlier.
Area forecast discussion, Apr 16, 8:34 PM MDT, 5 hours 35 minutes before
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</html>Hazardous weather outlook, Apr 16, 2:27 PM MDT, 11 hours 42 minutes before
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</html>The office that day
Everything else NWS Billings, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 17, 3:31 PM MDT | Winter Storm Warning | BYZ | Big Horn, Carbon, Park, Stillwater, Sweet Grass, Wheatland | 45 hr |
| Apr 17, 3:31 PM MDT | Winter Weather Advisory | BYZ | Big Horn, Carbon, Carter, Golden Valley, Musselshell, Park and 6 more | 42 hr |
Nearby
Winter Storm Watches in Montana, 2021Winter 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.