Alert archive / Wyoming / Frost Advisories in 2026

Frost Advisory 1, NWS Cheyenne, WY

May 19, 20264 counties in Wyoming; Sioux County, Nebraska

NWS Cheyenne, WY issued this frost advisory at May 19, 2026, 11:40 AM MDT for 4 counties in Wyoming; Sioux County, Nebraska. It took effect at May 20, 2026, 12:00 AM MDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: May 19, 2026, 11:40 AM MDT (17:40 UTC)
In effect from: May 20, 2026, 12:00 AM MDT
Expired: May 20, 2026, 8:00 AM MDT
In force: 8 hr
Issued by: NWS Cheyenne, WY

Counties Sioux County, NE, Albany County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 109 km from the middle of the area, began a volume at 17:43 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.

What forecasters said that day

The local office's own words before this frost advisory 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 frost advisory went out at May 18, 5:43 PM MDT, 17 hours 57 minutes earlier.

Area forecast discussion, May 18, 5:43 PM MDT, 17 hours 57 minutes before

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The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 19, 11:40 AM MDT	Freeze Warning	CYS	Albany, Carbon, Converse, Laramie	22 hr

Nearby

Frost Advisories in Wyoming, 2026 Frost Advisories in Nebraska, 2026 Every frost advisory in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.