Alert archive / Wyoming / Freeze Watches in 2021
Freeze Watch 1, NWS Cheyenne, WY
NWS Cheyenne, WY issued this freeze watch at Sep 19, 2021, 1:48 PM MDT for 5 counties in Wyoming. It took effect at Sep 21, 2021, 1:00 AM MDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Sep 19, 2021, 1:48 PM MDT (19:48 UTC)
- In effect from
- Sep 21, 2021, 1:00 AM MDT
- Expired
- Sep 20, 2021, 1:26 PM MDT
- In force
- Issued by
- NWS Cheyenne, WY
Counties Albany County, WY, Carbon County, WY, Converse County, WY, Laramie County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 109 km from the middle of the area, began a volume at 19:50 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, 7.8 hours before the alert went out and 264 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
- 2037 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 61 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this freeze watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Cheyenne, WY wrote its last area forecast discussion before this freeze watch went out at Sep 19, 11:40 AM MDT, 2 hours 8 minutes earlier.
Area forecast discussion, Sep 19, 11:40 AM MDT, 2 hours 8 minutes before
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</html>Hazardous weather outlook, Sep 19, 6:36 AM MDT, 7 hours 12 minutes before
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</html>The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 19, 12:56 AM MDT | High Wind Warning | CYS | Albany, Carbon | 20 hr |
| Sep 19, 1:48 PM MDT | Freeze Warning | CYS | Albany, Carbon | 18 hr |
Nearby
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.