Gillette, WY Weather Alerts

The following message is transmitted in collaboration with the
Wyoming Department of Environmental Quality, Air Quality Division,
and the Wyoming Department of Health.

* WHAT...Air Quality Alert for Wildfire Smoke.

* WHERE...Northeast Wyoming.

* WHEN...11 AM MDT today (Tuesday) through 1 PM MDT Wednesday.

* IMPACTS...Poor air quality due to wildfire smoke.

...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT SATURDAY FOR
GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR THE NORTHEASTERN
WYOMING PLAINS AND FAR SOUTHWESTERN SOUTH DAKOTA...

.An approaching low pressure system will bring very dry air and
gusty winds to the northeastern Wyoming plains and far
southwestern South Dakota today. Minimum relative humidities will
drop to near or below 15 percent in the afternoon, while
southwest winds increase to 10 to 25 mph, with gusts to 35 mph
expected across the northeast Wyoming plains. The low humidities
and gusty winds, combined with critically dry fuels, will allow
for critical fire weather conditions to develop across much of the
area.

* AFFECTED AREA...Fire Weather Zones 314 Northern Campbell, 315
Southern Campbell, 316 Crook County Plains, 317 Weston County
Plains and 322 Fall River County Area.

* WINDS...Southwest 15 to 25 mph with gusts up to 35 mph.

* RELATIVE HUMIDITY...As low as 12 percent.

* IMPACTS...The combination of gusty winds and low relative
humidity would produce critical fire weather conditions.

...RED FLAG WARNING IN EFFECT FROM 10 AM THIS MORNING TO 8 PM MDT
THIS EVENING FOR GUSTY WINDS...LOW RELATIVE HUMIDITY...AND
ISOLATED DRY THUNDERSTORMS FOR FIRE WEATHER ZONES 314, 315, 317,
322, AND 326...

A dry air mass will remain over much of northeast Wyoming and far
southwest South Dakota today, with afternoon relative humidities
dropping to 12 to around 15 percent. At the same time, winds will
be a bit stronger and gusty than they have been recently, with
gusts reaching 25 to 30 mph in many areas. Isolated mostly dry
thunderstorms are also possible late today. Given the critically
dry fuels, these conditions will allow for critical fire-weather
conditions to develop across most of the area this afternoon into
the early evening.

The National Weather Service in Rapid City has issued a Red Flag
Warning for gusty winds...low relative humidity...and dry
thunderstorms, which is in effect from 10 AM this morning to 8 PM
MDT this evening. The Fire Weather Watch is no longer in effect.

* AFFECTED AREA...Fire Weather Zones 314 Northern Campbell, 315
Southern Campbell, 317 Weston County Plains, 322 Fall River
County Area and 326 Pine Ridge Area.

* WINDS...South to southwest 10 to 20 mph with gusts up to 30 mph,
becoming westerly late in the day over much of the area.

* RELATIVE HUMIDITY...As low as 12 percent.

* IMPACTS...The combination of gusty winds and low relative
humidity would produce critical fire weather conditions.

* LIGHTNING...Cloud to ground lighting possible with little to no
rainfall expected late today.

* IMPACTS...The combination of gusty winds, low relative
humidity, and dry lightning would produce critical fire
weather conditions.

* WHAT...Heavy snow expected. Total snow accumulations of 6 to
12 inches. Winds gusting as high as 55 mph.

* WHERE...Northern Campbell County and Southern Campbell County.

* WHEN...From 6 PM this evening to 6 AM MDT Monday.

* IMPACTS...Travel could be very difficult. Widespread blowing
snow could significantly reduce visibility. Gusty winds could
bring down tree branches.

* WHAT...For the Wind Chill Advisory, very cold wind chills
expected. Wind chills as low as 25 below zero. For the Wind
Chill Warning, dangerously cold wind chills expected. Wind
chills as low as 55 below zero.

* WHERE...Northern Campbell County, Southern Campbell County,
Western Crook County and Northeastern Crook County.

* WHEN...For the Wind Chill Advisory, from 4 AM to 2 PM MST
Friday. For the Wind Chill Warning, from 2 PM Friday to 11 AM
MST Sunday.

* IMPACTS...The dangerously cold wind chills could cause
frostbite on exposed skin in as little as 10 minutes.

* WHAT...For the Wind Chill Advisory, very cold wind chills
expected. Wind chills as low as 25 below zero. For the Wind
Chill Warning, dangerously cold wind chills expected. Wind
chills as low as 55 below zero.

* WHERE...Northern Campbell County, Southern Campbell County,
Western Crook County and Northeastern Crook County.

* WHEN...For the Wind Chill Advisory, from 4 AM to 2 PM MST
Friday. For the Wind Chill Warning, from 2 PM Friday to 11 AM
MST Sunday.

* IMPACTS...The dangerously cold wind chills could cause
frostbite on exposed skin in as little as 10 minutes.

* WHAT...Snow expected. Total snow accumulations of up to 3
inches, with the higher amounts along and south of Interstate
90.

* WHERE...Northern Campbell County.

* WHEN...From 2 AM Thursday to 6 AM MST Friday.

* IMPACTS...Plan on slippery road conditions.

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH
474 IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR THE FOLLOWING AREAS

IN SOUTH DAKOTA THIS WATCH INCLUDES 13 COUNTIES

IN NORTHWEST SOUTH DAKOTA

BUTTE HARDING PERKINS

IN SOUTHWEST SOUTH DAKOTA

BENNETT CUSTER FALL RIVER
JACKSON OGLALA LAKOTA

IN WEST CENTRAL SOUTH DAKOTA

HAAKON LAWRENCE MEADE
PENNINGTON ZIEBACH

IN WYOMING THIS WATCH INCLUDES 3 COUNTIES

IN NORTHEAST WYOMING

CAMPBELL CROOK WESTON

THIS INCLUDES THE CITIES OF ALLEN, BILLSBURG, BISON, BUCKHORN,
BUFFALO, CLARETON, CUSTER, DEADWOOD, DOWNTOWN BELLE FOURCHE,
DOWNTOWN NEWCASTLE, DUPREE, EDGEMONT, FAITH, FOUR CORNERS,
GILLETTE, HERMOSA, HILL CITY, HOT SPRINGS, KADOKA, KIRLEY, KYLE,
LACREEK WILDLIFE REFUGE, LEAD, LEMMON, MARTIN, MILESVILLE,
MOORCROFT, MORRISEY, OGLALA, PHILIP, PINE RIDGE, RAPID CITY,
ROCHELLE, SPEARFISH, STURGIS, SUNDANCE, TUTHILL, UNION CENTER,
UPTON, WALL, AND WRIGHT.

THIS INCLUDES THE TRIBAL LANDS OF THE CHEYENNE RIVER RESERVATION
AND THE PINE RIDGE RESERVATION.

Smoke from western Canada wildfires will continue to move
southeast into the area behind a passing cold front. Visibilities
will be reduced through the nighttime hours, as low as around one
mile in some areas, especially across northwest South Dakota. If
driving, slow down, use your low-beam headlights, and leave plenty
of distance ahead of you if you encounter thicker areas of smoke.
Individuals with respiratory problems should avoid excessive
physical exertion and minimize outdoor activities.