Blizzard Warning 1, NWS Denver/Boulder, CO

359 
WWUS45 KBOU 242012
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
212 PM MDT Sun Mar 24 2024

COZ039-251200-
/O.UPG.KBOU.WW.Y.0017.240325T0000Z-240325T1500Z/
/O.EXA.KBOU.WS.W.0011.240325T0000Z-240325T1500Z/
Boulder And Jefferson Counties Below 6000 Feet/West Broomfield
County-
Including the cities of Golden, Longmont, Arvada, Boulder, and
Lakewood
212 PM MDT Sun Mar 24 2024

...WINTER STORM WARNING IN EFFECT FROM 6 PM THIS EVENING TO 9 AM MDT 
MONDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 5 and 
  11 inches. Winds gusting as high as 45 mph.

* WHERE...Boulder and the western suburbs of Denver.

* WHEN...From 6 PM this evening to 9 AM MDT Monday.

* IMPACTS...Travel could be very difficult. The hazardous conditions 
  could impact the Monday morning commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency. The latest road conditions for 
Colorado can be obtained by calling 5 1 1 or by going to 
www.cotrip.org.

&&

$$

COZ041-251200-
/O.CON.KBOU.BZ.W.0001.240325T0000Z-240325T1500Z/
Elbert/Central and East Douglas Counties Above 6000 Feet-
Including the cities of Castle Rock, Fondis, Kiowa, Elbert, and
Larkspur
212 PM MDT Sun Mar 24 2024

...BLIZZARD WARNING REMAINS IN EFFECT FROM 6 PM THIS EVENING TO 9 AM 
MDT MONDAY...

* WHAT...Blizzard conditions expected. Total snow accumulations 
  between 4 and 10 inches. Winds gusting as high as 60 mph.

* WHERE...Castle Rock.

* WHEN...From 6 PM this evening to 9 AM MDT Monday.

* IMPACTS...Visibilities may drop below 1/4 mile due to falling and 
  blowing snow. Travel could be very difficult. Widespread blowing 
  snow could significantly reduce visibility. The hazardous 
  conditions could impact the Monday morning commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Travel should be restricted to emergencies only. If you must travel, 
have a winter survival kit with you. If you get stranded, stay with 
your vehicle. The latest road conditions for Colorado can be 
obtained by calling 5 1 1 or by going to www.cotrip.org.



&&

$$

COZ034-251200-
/O.CON.KBOU.WS.W.0011.000000T0000Z-240325T1200Z/
South and Southeast Grand/West Central and Southwest
Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties
Above 9000 Feet-
Including the cities of Winter Park, Mount Blue Sky, Kenosha
Mountains, East Slopes Mosquito Range, East Slopes Southern Gore
Range, Eisenhower Tunnel, Williams Fork Mountains, Breckenridge,
Berthoud Pass, and Indian Peaks
212 PM MDT Sun Mar 24 2024

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM MDT MONDAY...

* WHAT...Heavy snow. Additional snow accumulations between 6 and 16 
  inches.

* WHERE...The Mountains of Summit County, the Mosquito Range, and 
  the Indian Peaks.

* WHEN...Until 6 AM MDT Monday.

* IMPACTS...Travel could be very difficult to impossible. Areas of 
  blowing snow could significantly reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency. The latest road conditions for 
Colorado can be obtained by calling 5 1 1 or by going to 
www.cotrip.org.



&&

$$

COZ036-251200-
/O.CON.KBOU.WS.W.0011.240325T0000Z-240325T1500Z/
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
Including the cities of Central City, Bailey, Evergreen,
Georgetown, Idaho Springs, and Westcreek
212 PM MDT Sun Mar 24 2024

...WINTER STORM WARNING REMAINS IN EFFECT FROM 6 PM THIS EVENING TO 
9 AM MDT MONDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 7 and 
  15 inches. Winds gusting as high as 45 mph.

* WHERE...The Southern Front Range Foothills.

* WHEN...From 6 PM this evening to 9 AM MDT Monday.

* IMPACTS...Travel could be very difficult. Areas of blowing snow 
  could significantly reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency. The latest road conditions for 
Colorado can be obtained by calling 5 1 1 or by going to 
www.cotrip.org.


&&

$$

COZ046-048>051-251200-
/O.UPG.KBOU.WS.A.0014.240325T0300Z-240325T1800Z/
/O.EXB.KBOU.WW.Y.0017.240325T0300Z-240325T1800Z/
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County-Logan County-Washington County-Sedgwick County-Phillips
County-
Including the cities of Akron, Last Chance, Otis, Peetz, Amherst,
Matheson, Sterling, Cope, Sedgwick, Limon, Ovid, Merino, Holyoke,
Hugo, Julesburg, Agate, Crook, and Haxtun
212 PM MDT Sun Mar 24 2024

...WINTER WEATHER ADVISORY IN EFFECT FROM 9 PM THIS EVENING TO NOON 
MDT MONDAY...

* WHAT...Snow expected. Total snow accumulations up to 5 inches. 
  Winds gusting as high as 55 mph.

* WHERE...Limon, Sterling, Akron, Julesburg, and Holyoke.

* WHEN...From 9 PM this evening to noon MDT Monday.

* IMPACTS...Visibilities may drop below 1/4 mile due to falling and 
  blowing snow. Plan on very difficult travel with possible road 
  closures.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for Colorado can be obtained by calling 5 1 1 or by going 
to www.cotrip.org.

&&

$$

COZ040-045-251200-
/O.EXT.KBOU.WW.Y.0017.240325T0200Z-240325T1500Z/
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County-Central and East Adams
and Arapahoe Counties-
Including the cities of Aurora, Leader, Byers, Littleton, Deer
Trail, Denver International Airport, Highlands Ranch, Parker,
Bennett, City of Denver, and Brighton
212 PM MDT Sun Mar 24 2024

...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 8 PM THIS EVENING TO 9 
AM MDT MONDAY...

* WHAT...Snow expected. Total snow accumulations between 3 and 7 
  inches. Winds gusting as high as 50 mph, especially east of I-25.

* WHERE...Denver, and Byers.

* WHEN...From 8 PM this evening to 9 AM MDT Monday.

* IMPACTS...Snow and blowing snow will reduce visibility to a 
  quarter mile or less. Travel could be difficult. The hazardous 
  conditions could impact the Monday morning commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for Colorado can be obtained by calling 5 1 1 or by going 
to www.cotrip.org.

&&

$$

COZ031-033-251200-
/O.CON.KBOU.WW.Y.0017.000000T0000Z-240325T1200Z/
West Jackson and West Grand Counties Above 9000 Feet-South and
East Jackson/Larimer/North and Northeast Grand/Northwest Boulder
Counties Above 9000 Feet-
Including the cities of Rocky Mountain National Park, Mt Zirkel,
Willow Creek Pass, Cameron Pass, Laramie and Medicine Bow
Mountains, and Rabbit Ears Range
212 PM MDT Sun Mar 24 2024

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT MONDAY...

* WHAT...Snow. Additional snow accumulations between 4 and 12 inches.

* WHERE...Rabbit Ears Pass, and Rocky Mountain National Park and the 
  Medicine Bow Range.

* WHEN...Until 6 AM MDT Monday.

* IMPACTS...Snow covered roads will make travel hazardous. Travel 
  could be very difficult.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency. The latest road conditions for 
Colorado can be obtained by calling 5 1 1 or by going to 
www.cotrip.org.



&&

$$

COZ035-251200-
/O.CON.KBOU.WW.Y.0017.240325T0000Z-240325T1200Z/
Larimer and Boulder Counties Between 6000 and 9000 Feet-
Including the cities of Glendevey, Estes Park, Nederland, and Red
Feather Lakes
212 PM MDT Sun Mar 24 2024

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING 
TO 6 AM MDT MONDAY...

* WHAT...Snow expected. Total snow accumulations between 4 and 12 
  inches. Winds gusting as high as 45 mph.

* WHERE...The Northern Front Range Foothills.

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

* IMPACTS...Roads will likely become slick and hazardous. Travel 
  could be very difficult.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for Colorado can be obtained by calling 5 1 1 or by going 
to www.cotrip.org.

&&

$$

COZ037-251200-
/O.CON.KBOU.WW.Y.0017.240325T0000Z-240325T1500Z/
Central and Southeast Park County-
Including the cities of Hartsel, Lake George, Fairplay, and South
Park
212 PM MDT Sun Mar 24 2024

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING 
TO 9 AM MDT MONDAY...

* WHAT...Snow expected. Total snow accumulations between 4 and 10 
  inches. Winds gusting as high as 35 mph.

* WHERE...South Park.

* WHEN...From 6 PM this evening to 9 AM MDT Monday.

* IMPACTS...Travel could be very difficult. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for Colorado can be obtained by calling 5 1 1 or by going 
to www.cotrip.org.

&&

$$

For more information from the National Weather Service, visit 
https://weather.gov/bou

Danielson

915 
WWUS45 KBOU 250304
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
904 PM MDT Sun Mar 24 2024

COZ041-251215-
/O.CON.KBOU.BZ.W.0001.000000T0000Z-240325T1500Z/
Elbert/Central and East Douglas Counties Above 6000 Feet-
Including the cities of Elbert, Larkspur, Fondis, Kiowa, and
Castle Rock
904 PM MDT Sun Mar 24 2024

...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 9 AM MDT MONDAY...

* WHAT...Blizzard conditions expected. Total snow accumulations 
  between 4 and 10 inches. Winds gusting as high as 60 mph.

* WHERE...Castle Rock.

* WHEN...Until 9 AM MDT Monday.

* IMPACTS...Visibilities may drop below 1/4 mile due to falling and 
  blowing snow. Travel could be very difficult. Widespread blowing 
  snow could significantly reduce visibility. The hazardous 
  conditions could impact the Monday morning commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Travel should be restricted to emergencies only. If you must travel, 
have a winter survival kit with you. If you get stranded, stay with 
your vehicle. The latest road conditions for Colorado can be 
obtained by calling 5 1 1 or by going to www.cotrip.org.



&&

$$

COZ034-251200-
/O.CON.KBOU.WS.W.0011.000000T0000Z-240325T1200Z/
South and Southeast Grand/West Central and Southwest
Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties
Above 9000 Feet-
Including the cities of Kenosha Mountains, Williams Fork
Mountains, East Slopes Southern Gore Range, Breckenridge, Mount
Blue Sky, Winter Park, Eisenhower Tunnel, East Slopes Mosquito
Range, Indian Peaks, and Berthoud Pass
904 PM MDT Sun Mar 24 2024

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM MDT MONDAY...

* WHAT...Heavy snow. Additional snow accumulations between 8 and 18 
  inches.

* WHERE...The Mountains of Summit County, the Mosquito Range, and 
  the Indian Peaks.

* WHEN...Until 6 AM MDT Monday.

* IMPACTS...Travel could be very difficult to impossible. Areas of 
  blowing snow could significantly reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency. The latest road conditions for 
Colorado can be obtained by calling 5 1 1 or by going to 
www.cotrip.org.



&&

$$

COZ036-251215-
/O.CON.KBOU.WS.W.0011.000000T0000Z-240325T1500Z/
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
Including the cities of Idaho Springs, Bailey, Central City,
Evergreen, Georgetown, and Westcreek
904 PM MDT Sun Mar 24 2024

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM MDT MONDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 8 and 
  14 inches. Winds gusting as high as 35 mph.

* WHERE...The Southern Front Range Foothills.

* WHEN...Until 9 AM MDT Monday.

* IMPACTS...Travel could be very difficult. Areas of blowing snow 
  could significantly reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency. The latest road conditions for 
Colorado can be obtained by calling 5 1 1 or by going to 
www.cotrip.org.


&&

$$

COZ039-251215-
/O.CON.KBOU.WS.W.0011.000000T0000Z-240325T1500Z/
Boulder And Jefferson Counties Below 6000 Feet/West Broomfield
County-
Including the cities of Arvada, Longmont, Lakewood, Golden, and
Boulder
904 PM MDT Sun Mar 24 2024

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM MDT MONDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 5 and 
  11 inches. Winds gusting as high as 45 mph.

* WHERE...Boulder and the western suburbs of Denver.

* WHEN...Until 9 AM MDT Monday.

* IMPACTS...Travel could be very difficult. The hazardous conditions 
  could impact the Monday morning commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency. The latest road conditions for 
Colorado can be obtained by calling 5 1 1 or by going to 
www.cotrip.org.

&&

$$

COZ031-033-251200-
/O.CON.KBOU.WW.Y.0017.000000T0000Z-240325T1200Z/
West Jackson and West Grand Counties Above 9000 Feet-South and
East Jackson/Larimer/North and Northeast Grand/Northwest Boulder
Counties Above 9000 Feet-
Including the cities of Laramie and Medicine Bow Mountains,
Cameron Pass, Mt Zirkel, Rocky Mountain National Park, Willow
Creek Pass, and Rabbit Ears Range
904 PM MDT Sun Mar 24 2024

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT MONDAY...

* WHAT...Snow. Additional snow accumulations between 6 and 12 
  inches. Winds gusting as high as 35 mph.

* WHERE...Rabbit Ears Pass, and Rocky Mountain National Park and the 
  Medicine Bow Range.

* WHEN...Until 6 AM MDT Monday.

* IMPACTS...Snow covered roads will make travel hazardous. Travel 
  could be very difficult.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency. The latest road conditions for 
Colorado can be obtained by calling 5 1 1 or by going to 
www.cotrip.org.



&&

$$

COZ035-251200-
/O.CON.KBOU.WW.Y.0017.000000T0000Z-240325T1200Z/
Larimer and Boulder Counties Between 6000 and 9000 Feet-
Including the cities of Red Feather Lakes, Estes Park, Nederland,
and Glendevey
904 PM MDT Sun Mar 24 2024

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT MONDAY...

* WHAT...Snow expected. Total snow accumulations between 4 and 12 
  inches. Winds gusting as high as 45 mph.

* WHERE...The Northern Front Range Foothills.

* WHEN...Until 6 AM MDT Monday.

* IMPACTS...Roads will likely become slick and hazardous. Travel 
  could be very difficult.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for Colorado can be obtained by calling 5 1 1 or by going 
to www.cotrip.org.

&&

$$

COZ037-251215-
/O.CON.KBOU.WW.Y.0017.000000T0000Z-240325T1500Z/
Central and Southeast Park County-
Including the cities of Fairplay, Hartsel, South Park, and Lake
George
904 PM MDT Sun Mar 24 2024

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM MDT MONDAY...

* WHAT...Snow expected. Total snow accumulations between 4 and 10 
  inches. Winds gusting as high as 35 mph.

* WHERE...South Park.

* WHEN...Until 9 AM MDT Monday.

* IMPACTS...Plan on slippery road conditions. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for Colorado can be obtained by calling 5 1 1 or by going 
to www.cotrip.org.

&&

$$

COZ040-045-251215-
/O.CON.KBOU.WW.Y.0017.000000T0000Z-240325T1500Z/
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County-Central and East Adams
and Arapahoe Counties-
Including the cities of Deer Trail, City of Denver, Bennett,
Brighton, Leader, Littleton, Highlands Ranch, Aurora, Parker,
Denver International Airport, and Byers
904 PM MDT Sun Mar 24 2024

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM MDT MONDAY...

* WHAT...Snow expected. Total snow accumulations between 3 and 7 
  inches. Winds gusting as high as 50 mph, especially east of I-25.

* WHERE...Denver, and Byers.

* WHEN...Until 9 AM MDT Monday.

* IMPACTS...Snow and blowing snow will reduce visibility to a 
  quarter mile or less. Travel could be difficult. The hazardous 
  conditions could impact the Monday morning commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for Colorado can be obtained by calling 5 1 1 or by going 
to www.cotrip.org.

&&

$$

COZ046-048>051-251215-
/O.CON.KBOU.WW.Y.0017.000000T0000Z-240325T1800Z/
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County-Logan County-Washington County-Sedgwick County-Phillips
County-
Including the cities of Merino, Hugo, Akron, Haxtun, Ovid, Cope,
Crook, Sedgwick, Otis, Amherst, Holyoke, Last Chance, Limon,
Agate, Julesburg, Matheson, Sterling, and Peetz
904 PM MDT Sun Mar 24 2024

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT MONDAY...

* WHAT...Snow expected. Total snow accumulations up to 5 inches. 
  Winds gusting as high as 55 mph.

* WHERE...Limon, Sterling, Akron, Julesburg, and Holyoke.

* WHEN...Until noon MDT Monday.

* IMPACTS...Visibilities may drop below 1/4 mile due to falling and 
  blowing snow. Plan on very difficult travel with possible road 
  closures.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for Colorado can be obtained by calling 5 1 1 or by going 
to www.cotrip.org.

&&

$$

For more information from the National Weather Service, visit 
https://weather.gov/bou

Cooper

071 
WWUS45 KBOU 251155
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
555 AM MDT Mon Mar 25 2024

COZ041-251500-
/O.CAN.KBOU.BZ.W.0001.000000T0000Z-240325T1500Z/
/O.EXA.KBOU.WW.Y.0017.000000T0000Z-240325T1500Z/
Elbert/Central and East Douglas Counties Above 6000 Feet-
Including the cities of Elbert, Larkspur, Kiowa, Fondis, and
Castle Rock
555 AM MDT Mon Mar 25 2024

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 9 AM MDT THIS MORNING...
...BLIZZARD WARNING IS CANCELLED...

* WHAT...Snow. Additional snow accumulations up to one inch. Winds 
  gusting as high as 40 mph.

* WHERE...Castle Rock.

* WHEN...Until 9 AM MDT this morning.

* IMPACTS...Plan on slippery road conditions. Widespread blowing 
  snow could significantly reduce visibility. The hazardous 
  conditions will impact this mornings commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for Colorado can be obtained by calling 5 1 1 or by going 
to www.cotrip.org.

&&

$$

COZ036-251500-
/O.CAN.KBOU.WS.W.0011.000000T0000Z-240325T1500Z/
/O.EXA.KBOU.WW.Y.0017.000000T0000Z-240325T1500Z/
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
Including the cities of Georgetown, Central City, Westcreek,
Idaho Springs, Bailey, and Evergreen
555 AM MDT Mon Mar 25 2024

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 9 AM MDT THIS MORNING...
...WINTER STORM WARNING IS CANCELLED...

* WHAT...Snow. Additional snow accumulations up to one inch.

* WHERE...The Southern Front Range Foothills.

* WHEN...Until 9 AM MDT this morning.

* IMPACTS...Plan on slippery road conditions. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for Colorado can be obtained by calling 5 1 1 or by going 
to www.cotrip.org.

&&

$$

COZ039-251500-
/O.CAN.KBOU.WS.W.0011.000000T0000Z-240325T1500Z/
/O.EXA.KBOU.WW.Y.0017.000000T0000Z-240325T1500Z/
Boulder And Jefferson Counties Below 6000 Feet/West Broomfield
County-
Including the cities of Boulder, Lakewood, Longmont, Arvada, and
Golden
555 AM MDT Mon Mar 25 2024

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 9 AM MDT THIS MORNING...
...WINTER STORM WARNING IS CANCELLED...

* WHAT...Snow. Additional snow accumulations up to one inch.

* WHERE...Boulder and the western suburbs of Denver.

* WHEN...Until 9 AM MDT this morning.

* IMPACTS...Plan on slippery road conditions. The hazardous 
  conditions will impact this mornings commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for Colorado can be obtained by calling 5 1 1 or by going 
to www.cotrip.org.

&&

$$

COZ034-251300-
/O.EXP.KBOU.WS.W.0011.000000T0000Z-240325T1200Z/
South and Southeast Grand/West Central and Southwest
Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties
Above 9000 Feet-
Including the cities of Berthoud Pass, Kenosha Mountains, East
Slopes Mosquito Range, Indian Peaks, Eisenhower Tunnel, Williams
Fork Mountains, Breckenridge, Mount Blue Sky, East Slopes
Southern Gore Range, and Winter Park
555 AM MDT Mon Mar 25 2024

...WINTER STORM WARNING WILL EXPIRE AT 6 AM MDT EARLY THIS MORNING...

Roads will be icy and snowpacked with additional accumulations 
around an inch.

$$

COZ031-033-035-251300-
/O.EXP.KBOU.WW.Y.0017.000000T0000Z-240325T1200Z/
West Jackson and West Grand Counties Above 9000 Feet-South and
East Jackson/Larimer/North and Northeast Grand/Northwest Boulder
Counties Above 9000 Feet-Larimer and Boulder Counties Between
6000 and 9000 Feet-
Including the cities of Laramie and Medicine Bow Mountains, Red
Feather Lakes, Willow Creek Pass, Nederland, Glendevey, Estes
Park, Rabbit Ears Range, Mt Zirkel, Rocky Mountain National Park,
and Cameron Pass
555 AM MDT Mon Mar 25 2024

...WINTER WEATHER ADVISORY WILL EXPIRE AT 6 AM MDT EARLY THIS 
MORNING...

The threat has ended.

$$

COZ037-251500-
/O.CON.KBOU.WW.Y.0017.000000T0000Z-240325T1500Z/
Central and Southeast Park County-
Including the cities of Hartsel, Fairplay, Lake George, and South
Park
555 AM MDT Mon Mar 25 2024

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM MDT THIS 
MORNING...

* WHAT...Snow. Additional snow accumulations up to one inch.

* WHERE...South Park.

* WHEN...Until 9 AM MDT this morning.

* IMPACTS...Plan on slippery road conditions. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for Colorado can be obtained by calling 5 1 1 or by going 
to www.cotrip.org.

&&

$$

COZ040-045-251500-
/O.CON.KBOU.WW.Y.0017.000000T0000Z-240325T1500Z/
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County-Central and East Adams
and Arapahoe Counties-
Including the cities of Littleton, Bennett, Denver International
Airport, Highlands Ranch, Deer Trail, Leader, City of Denver,
Parker, Aurora, Brighton, and Byers
555 AM MDT Mon Mar 25 2024

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM MDT THIS 
MORNING...

* WHAT...Snow. Additional snow accumulations up to one inch. Winds 
  gusting as high as 45 mph, east of Denver.

* WHERE...Denver, and Byers.

* WHEN...Until 9 AM MDT this morning.

* IMPACTS...Snow and blowing snow will reduce visibility to a 
  quarter mile or less. Plan on slippery road conditions. The 
  hazardous conditions will impact this mornings commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for Colorado can be obtained by calling 5 1 1 or by going 
to www.cotrip.org.

&&

$$

COZ046-048>051-251800-
/O.CON.KBOU.WW.Y.0017.000000T0000Z-240325T1800Z/
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County-Logan County-Washington County-Sedgwick County-Phillips
County-
Including the cities of Otis, Julesburg, Akron, Sterling,
Holyoke, Sedgwick, Peetz, Cope, Crook, Limon, Merino, Last
Chance, Matheson, Ovid, Agate, Amherst, Hugo, and Haxtun
555 AM MDT Mon Mar 25 2024

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT TODAY...

* WHAT...Snow. Additional snow accumulations up to one inch. Winds 
  gusting as high as 5 mph.

* WHERE...Limon, Sterling, Akron, Julesburg, and Holyoke.

* WHEN...Until noon MDT today.

* IMPACTS...Plan on slippery road conditions. Widespread blowing 
  snow could significantly reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for Colorado can be obtained by calling 5 1 1 or by going 
to www.cotrip.org.

&&

$$

For more information from the National Weather Service, visit 
https://weather.gov/bou

RPK

Area Forecast Discussion
National Weather Service Denver/Boulder CO
852 PM MDT Sat Mar 23 2024

.KEY MESSAGES...

- A weather system will affect the area Sunday through early
  Monday morning. This system may bring heavier snowfall to
  portions of the mountains, southern foothills and Palmer Divide
  Sunday night. However, confidence in exact details still remain
  low at this time.

- Blowing snow impacts possible across the Palmer Divide Sunday
  night through early Monday.

- Snow shower activity will continue in the mountains Tuesday and
  Wednesday with mainly dry conditions over the plains.

&&

.UPDATE...
Issued at 833 PM MDT Sat Mar 23 2024

No significant changes have been made to the grids through the
overnight period, as the previous forecast was largely in good
shape. We should see a gradual increase in snow showers across the
high country over the next several hours as better moisture works
into the region. Have made some minor tweaks to the forecast up
there to better reflect timing of the more widespread snow
overnight.

Meanwhile, all eyes remain on the upper trough that is expected to
bring impactful weather to most of the state tomorrow. There have
been a couple of noteworthy signals from the early 00z guidance
this evening - with a stronger closed 500mb low developing further
southwest compared to previous runs... with the surface low also
reflecting this shift. This has led to a slightly more favorable
NNE upslope flow across the foothills and I-25 corridor. If (and
that's a big *if*) this trend continues overnight, we may need to
make some adjustments to our headlines... but that will come
overnight tonight or during the day Sunday. Stay tuned!

&&

.SHORT TERM...(This evening through Sunday)
Issued at 327 PM MDT Sat Mar 23 2024

Water vapor imagery reveals there is a shortwave trough moving
onshore over California. There is weak QG ascent across Colorado
under diffluent flow aloft ahead of the shortwave. At the surface,
there is weak lee cyclogenesis across eastern Colorado. A boundary
has formed along I-70 east of Denver and this boundary appears it
will be the genesis point for showers and storms to form later this
afternoon. These showers and storms will move northeastward along
the I-76 corridor through the evening. After midnight, the plains
will remain mostly dry as a pocket of drier air aloft moves in.

In the mountains, radar is beginning to pick up on light showers
this afternoon. These showers will stay light throughout the
afternoon and evening before more low level moisture arrives after
midnight. In contrast to the plains, snow showers will increase in
the overnight hours with a couple inches of snow along the western
slopes possible.

The aforementioned shortwave trough will move northeastward tomorrow
eventually ending up in eastern Colorado. Strong lee cyclogenesis
will rapidly deepen a surface low pressure system that will position
itself in the Arkansas River Valley. The combination of these
features will create strong QG ascent and precipitation will form
across the majority of our forecast area in the afternoon after many
dry hours in the morning. There will be a few focus areas for
heavier precipitation. The first will be the higher Front Range
mountains and foothills as strong lapse rates, healthy moisture, and
QG ascent will lead to moderate to briefly heavy snowfall. Another
focus area for precipitation will be the base of the foothills onto
the adjacent plains and I-25 corridor. There will be widespread
thunderstorms in this area with briefly heavy rainfall. Some of the
CAMs have rainfall up to an inch with these storms but most of the
area will pick up about a quarter of an inch of rain. The final
focus area for precipitation will be along I-70 in Elbert and
Lincoln Counties. A boundary will setup there in the afternoon with
most unstable CAPE above 500 j/kg to the north of it. Thunderstorms
will form along this boundary with brief heavy rain and hail likely.
Soundings indicate steep lapse rates around 9 C/km with strong
forcing in the hail growth zone. While it appears instability will
be a bit too weak for severe hail, hailstones up to three-quarters
of an inch will be possible.

By the late afternoon, a cold front/modified outflow boundary will
form over the northern plains and will begin to rapidly move
southward. This front will decrease temperatures to the mid 30s by
6pm and some snow will begin mixing in with the rain across the
plains. No snow accumulation is expected across the plains before
6pm.

.LONG TERM...(Sunday night through Saturday)
Issued at 327 PM MDT Sat Mar 23 2024

...Late weekend system to bring snow to the mountains, foothills,
and portions of the plains...

Sun night into Mon, an open wave trough moves across the region.
It will contain a more pronounced southerly branch with an upper
jet that will provide sufficient synoptic ascent. There is a
general consensus among model guidance that this trough moves east
across Colorado into Sun PM with a closed low developing along
the CO-KS border before it lifts northeast across KS. Above normal
moisture will accompany this system, further supporting
precipitation. There is still notable uncertainty in the placement
of this low which will have impacts on amounts. This will be
discussed in more detail later on in this discussion.

By Sun evening, a cold front will have settled across the region
with enhanced northerly upslope flow filling in behind it across
the lower elevations. Lapse rates will still hold rather unstable
across the mountains, although not as unstable as the afternoon.
This will keep snow going in the mountains. However, the real
change will be the changeover to snow across the Palmer Divide
then lower elevations as well as an uptick in snow for the
southern foothills. This is reinforced by the arrival of colder
air and enhanced upslope flow favoring the south foothills. Right
now, seeing a changeover in the early evening timeframe (23-01Z)
across the Palmer Divide, then across the adjacent plains as it
continues to cool. Most model guidance is highlighting the
potential for a favorable window for accumulating snowfall Sunday
evening, mainly across the southern foothills and into the Palmer
Divide areas. Model soundings reflect this quite well with deeply
saturated profiles with notable lift/instability in the dendritic
growth zone.

After midnight, lapse rates weaken and moisture decreases as the
larger scale forcing moves out. Snow gradually decreases in coverage
and intensity toward sunrise. Monday, temperatures will be below
normal in the 30s across the lower elevations and 20s/30s for the
high country. Residual moisture and rebounding lapse rates in the
toward the afternoon support some mountain snow showers.

As tracking of the system remains lower confidence, the snow totals
will be as well. Some models have been more consistent than others.
The GFS (deterministic & ens) has been generally wetter than the
ECMWF suite. GFS ens mean QPF puts around .7-.95" for the south
foothills, front range and .5-.7 for the adjacent plains. The 12z
ECMWF, although trended wetter than its previous run, but still
remains the drier of the models. Higher-res models have also been on
the wetter side, similar to the GFS. The GFS and higher-res guidance
have unfortunately been less consistent from run to run, so although
a good chunk of guidance is trending upward in amounts, there is
still not a whole lot of consistency on where the higher amounts may
be and exactly how much.

For now, leaning on the more conservative end of guidance with
snow totals. Front Range and central mountains in that 8-12 inch
range with localized higher amounts. More uncertainty in store for
the southern Foothills, Palmer Divide, and plains. Palmer Divide
around 2-8" for now. Southern foothills 4-10". Despite this being
below Winter Storm Warning criteria, there is the lower
probability scenario it being closer to a foot. Given the
potential, but low confidence at this time, went with Winter Storm
Watches for these areas Sun eve through Mon AM. Denver metro
currently has no highlights, but will be evaluated for advisories
for the evening package since it may impact the Mon AM commute.

And now the last concern we need to discuss...wind. This system will
be accompanied by a well developed low with a sufficiently tined
pressure gradient wrapped around it. This will provide plenty of
wind across the plains as the low exits Colorado Sunday night into
Monday. Gusty northerly winds 40-50 mph will become consistent
across the east plains and Palmer Divide Sunday night. There are
also areas that will be favored for higher gusts such as the east
plains along WY border, Washington County, and Lincoln County.
These areas have potential for gusts to peak 55-65 mph at times.
As a result, a High Wind Watch has been issued. Wind and snow are
a hazardous combination (blowing snow) and have potential to
impact the Palmer Divide since they have a much higher likelihood
for blowable snow than east. A Winter Storm Watch for blizzard
conditions was issued for zone 41 (Palmer Divide) Sun eve through
Mon morning.

Early next week, the mountains will see periodic chance for
orographic snow while the plains remain mostly dry. A ridge builds
in midweek decreasing moisture in the mountains and warming
temperatures.

&&

.AVIATION...(For the 00Z TAFS through 00Z Sunday evening)
Issued at 534 PM MDT Sat Mar 23 2024

VFR tonight with generally quiet conditions. Denver cyclone has
lifted northward with a few SHRA well to the north and east of the
terminals. Haven't seen any strong outflow from these showers, and
winds should gradually decrease in speed over the next few hours,
turning from northwest to southwest. Weak drainage flow is
expected overnight.

Tomorrow's forecast gets more complicated as a strong storm system
brings impactful weather to the region during the afternoon and
evening hours. The first question is the wind, with guidance
showing a variety of different directions during the afternoon.
Eventually this should switch to a northerly component as a strong
cold front pushes through the terminals. With moisture increasing
through the day, scattered showers and thunderstorms are forecast
by the mid-afternoon hours, becoming more widespread into the
evening. Rain should begin to mix with and change over to snow
after 00z tomorrow evening.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
Winter Weather Advisory from midnight tonight to 6 AM MDT Monday
for COZ031-033-034.

Winter Storm Watch from Sunday evening through Monday morning
for COZ036-041.

High Wind Watch from Sunday evening through Monday morning for
COZ038-042-048.

High Wind Watch from Sunday evening through Monday morning for
COZ046-047-049.

&&

UPDATE...Hiris
SHORT TERM...Danielson
LONG TERM...Mensch
AVIATION...Hiris

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1102 AM MDT Sat Mar 23 2024

COZ030>051-241715-
Jackson County Below 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
Central and Southeast Park County-
Larimer County Below 6000 Feet/Northwest Weld County-
Boulder And Jefferson Counties Below 6000 Feet/West Broomfield
County-
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County-
Elbert/Central and East Douglas Counties Above 6000 Feet-
Northeast Weld County-Central and South Weld County-Morgan County-
Central and East Adams and Arapahoe Counties-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
Logan County-Washington County-Sedgwick County-Phillips County-
1102 AM MDT Sat Mar 23 2024

This hazardous weather outlook is for northeast and north central
Colorado.

.DAY ONE...This Afternoon and Tonight

Scattered light snow showers will develop over the mountains this
afternoon, with minimal accumulations expected. Light to moderate
snow will develop over the mountains this evening and tonight.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

The next storm will move across the area Sunday through Sunday
night. This system will bring a period of heavier snowfall to the
mountains, southern foothills, and Palmer Divide Sunday and
Sunday night with travel impacts into early Monday morning.

Across the Denver metro and the rest of the plains, rain will
switch to snow by early Sunday evening. Snowfall amounts around
Denver will be in the 2 to 4 inch range with locally up to 6
inches in the far western and southern suburbs. Across the plains
snowfall amounts will be in the 1 to 2 inch range. Gusty north
winds may cause poor visibility in blowing snow across portions of
the plains as well and across the Palmer Divide.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.