425 
WWUS75 KCYS 200750
NPWCYS

URGENT - WEATHER MESSAGE
National Weather Service Cheyenne WY
150 AM MDT Wed May 20 2026

WYZ116-201600-
/O.NEW.KCYS.FG.Y.0004.260520T0750Z-260520T1500Z/
/O.CON.KCYS.FZ.W.0003.000000T0000Z-260520T1600Z/
South Laramie Range-
Including the cities of Buford, Pumpkin Vine, and Vedauwoo
150 AM MDT Wed May 20 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM MDT THIS MORNING...

...FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM MDT THIS MORNING...

* WHAT...For the Dense Fog Advisory, visibility below one quarter of 
  a mile in dense fog. For the Freeze Warning, sub-freezing 
  temperatures as low as 30 degrees.

* WHERE...South Laramie Range.

* WHEN...For the Dense Fog Advisory, until 9 AM MDT this morning. 
  For the Freeze Warning, until 10 AM MDT this morning.

* IMPACTS...Low visibility could make driving conditions hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If driving, slow down, use your headlights, and leave plenty of 
distance ahead of you.

&&

$$

WYZ101-115-201400-
/O.CON.KCYS.FZ.W.0003.000000T0000Z-260520T1400Z/
Converse County Lower Elevations-Laramie Valley-
Including the cities of Deer Creek, Glenrock, Bill, Douglas,
Laramie, and Bosler
150 AM MDT Wed May 20 2026

...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM MDT THIS MORNING...

* WHAT...Sub-freezing temperatures between 25 and 32 degrees 
  expected.

* WHERE...Converse County Lower Elevations and Laramie Valley.

* WHEN...Until 8 AM MDT this morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

WYZ104-105-109>111-113-201600-
/O.CON.KCYS.FZ.W.0003.000000T0000Z-260520T1600Z/
Ferris/Seminoe/Shirley Mountains-Shirley Basin-Central Carbon
County-North Snowy Range Foothills-Southwest Carbon County-Upper
North Platte River Basin-
Including the cities of Encampment, Seminoe Dam, Rawlins, Shirley
Basin, Arlington, Saratoga, Medicine Bow, Baggs, and Elk Mountain
150 AM MDT Wed May 20 2026

...FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM MDT THIS MORNING...

* WHAT...Sub-freezing temperatures as low as 13.

* WHERE...Central Carbon County, Ferris/Seminoe/Shirley Mountains, 
  North Snowy Range Foothills, Shirley Basin, Southwest Carbon 
  County, Upper North Platte River Basin, and South Laramie Range.

* WHEN...Until 10 AM MDT this morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

NEZ095-WYZ102-106-107-117-201400-
/O.CON.KCYS.FR.Y.0001.000000T0000Z-260520T1400Z/
Northern Sioux County-Niobrara County-Central Laramie Range and
Southwest Platte County-East Platte County-South Laramie Range
Foothills-
Including the cities of Harrison, Horse Creek, Wheatland,
Bordeaux, Guernsey, Whitaker, Federal, Redbird, and Lusk
150 AM MDT Wed May 20 2026

...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM MDT THIS MORNING...

* WHAT...Temperatures between 29 and 34 will result in frost 
  formation.

* WHERE...In Nebraska, Northern Sioux County. In Wyoming, Niobrara 
  County, Central Laramie Range and Southwest Platte County, East 
  Platte County, and South Laramie Range Foothills.

* WHEN...Until 8 AM MDT this morning.

* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive 
  outdoor plants may be killed if left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

Trudel