Alert archive / Wyoming / Frost Advisories in 2021
Frost Advisory 2, NWS Cheyenne, WY
NWS Cheyenne, WY issued this frost advisory at Sep 30, 2021, 2:24 PM MDT for 5 counties in Wyoming. It took effect at Oct 1, 2021, 1:00 AM MDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Sep 30, 2021, 2:24 PM MDT (20:24 UTC)
- In effect from
- Oct 1, 2021, 1:00 AM MDT
- Expired
- Oct 1, 2021, 8:00 AM MDT
- In force
- 7 hr
- Issued by
- NWS Cheyenne, WY
Counties Converse County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 129 km from the middle of the area, began a volume at 20:28 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
Rapid City, SD (KUNR), launched 12:00Z, 8.4 hours before the alert went out and 250 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
- 1788 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
997 WWUS75 KCYS 302024 NPWCYS URGENT - WEATHER MESSAGE National Weather Service Cheyenne WY 224 PM MDT Thu Sep 30 2021 WYZ101-102-107-108-118-119-011200- /O.NEW.KCYS.FR.Y.0002.211001T0700Z-211001T1400Z/ Converse County Lower Elevations-Niobrara County- East Platte County-Goshen County-Central Laramie County- East Laramie County- Including the cities of Douglas, Glenrock, Bill, Deer Creek, Lusk, Redbird, Wheatland, Guernsey, Torrington, Cheyenne, and Pine Bluffs 224 PM MDT Thu Sep 30 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 8 AM MDT FRIDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Converse County Lower Elevations, Niobrara County, East Platte County, Goshen County, Central Laramie County and East Laramie County. * WHEN...From 1 AM to 8 AM MDT Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Brothers
2 follow-up statements
459 WWUS75 KCYS 010957 NPWCYS URGENT - WEATHER MESSAGE National Weather Service Cheyenne WY 357 AM MDT Fri Oct 1 2021 WYZ101-102-107-108-118-119-011400- /O.CON.KCYS.FR.Y.0002.000000T0000Z-211001T1400Z/ Converse County Lower Elevations-Niobrara County- East Platte County-Goshen County-Central Laramie County- East Laramie County- Including the cities of Douglas, Glenrock, Bill, Deer Creek, Lusk, Redbird, Wheatland, Guernsey, Torrington, Cheyenne, and Pine Bluffs 357 AM MDT Fri Oct 1 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM MDT THIS MORNING... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Converse County Lower Elevations, Niobrara County, East Platte County, Goshen County, Central Laramie County and East Laramie County. * WHEN...Until 8 AM MDT Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Gimmestad
644 WWUS75 KCYS 011343 NPWCYS URGENT - WEATHER MESSAGE National Weather Service Cheyenne WY 743 AM MDT Fri Oct 1 2021 WYZ101-102-107-108-118-119-011445- /O.EXP.KCYS.FR.Y.0002.000000T0000Z-211001T1400Z/ Converse County Lower Elevations-Niobrara County- East Platte County-Goshen County-Central Laramie County- East Laramie County- Including the cities of Douglas, Glenrock, Bill, Deer Creek, Lusk, Redbird, Wheatland, Guernsey, Torrington, Cheyenne, and Pine Bluffs 743 AM MDT Fri Oct 1 2021 ...FROST ADVISORY WILL EXPIRE AT 8 AM MDT THIS MORNING... Temperatures are expected to increase this morning into the upper 30s. Therefore, the frost advisory will be allowed to expire on time. $$
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 30, 7:00 AM MDT | Dense Fog Advisory | CYS | Albany, Laramie | 3 hr |
Nearby
Frost Advisories in Wyoming, 2021Every frost advisory 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.