Alert archive / Colorado / Winter Storm Warnings in 2024

Winter Storm Warning 13, NWS Denver/Boulder, CO

April 26, 202410 counties in Colorado

NWS Denver/Boulder, CO issued this winter storm warning at Apr 26, 2024, 1:36 PM MDT for 10 counties in Colorado. It took effect at Apr 26, 2024, 9:00 PM MDT. It was in force for 27 hr. 60 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Apr 26, 2024, 1:36 PM MDT (19:36 UTC)
In effect from
Apr 26, 2024, 9:00 PM MDT
Expired
Apr 28, 2024, 12:02 AM MDT
In force
27 hr
Issued by
NWS Denver/Boulder, CO

Counties Boulder County, CO, Clear Creek County, CO, Douglas County, CO, Gilpin County, CO, Grand County, CO, Jackson County, CO, Jefferson County, CO, Larimer County, CO, Park County, CO, Summit County, CO

The radar

The Denver radar (KFTG), 94 km from the middle of the area, began a volume at 19:38 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 was reported inside it

TimeReportWhereRemark
Apr 27, 7:24 AM MDTSNOW 7.73 E Pennock Pass, CO
Apr 27, 8:00 AM MDTSNOW 0.9Walden, CO
Apr 27, 8:15 AM MDTSNOW 5.61 W Aspen Springs, CO.
Apr 27, 8:15 AM MDTSNOW 5.61 W Aspen Springs, CO
Apr 27, 8:30 AM MDTSNOW 64 Ne Nederland, COSnowfall rate 3 inches per hour at time of report.
Apr 27, 9:30 AM MDTSNOW 5.52 W Aspen Park, CO
Apr 27, 9:30 AM MDTSNOW 61 S Crescent Village, CO.
Apr 27, 9:30 AM MDTSNOW 61 S Crescent Village, CO
Apr 27, 9:30 AM MDTSNOW 103 Sw Fairplay, CO
Apr 27, 9:33 AM MDTSNOW 5.42 Se Breckenridge, CO
Apr 27, 10:00 AM MDTSNOW 7.51 Ssw Copper Mountain, COAs of 10AM Saturday per Copper mountain resort snow stake.
Apr 27, 10:00 AM MDTSNOW 83 Sw Breckenridge, COAs of 10AM Saturday per Breckenridge resort snow stake.
Apr 27, 10:03 AM MDTSNOW 42 Sse Winter Park, COAs of 10AM Saturday per Winter Park resort snow stake.
Apr 27, 10:04 AM MDTSNOW 5.51 Wnw Loveland Pass, COAs of 10AM Saturday per Loveland resort snow stake.
Apr 27, 10:10 AM MDTSNOW 53 Ene Antero Junction, CO
Apr 27, 10:10 AM MDTSNOW 5.51 N Genesee, CO.
Apr 27, 10:10 AM MDTSNOW 5.51 N Genesee, CO
Apr 27, 10:30 AM MDTSNOW 93 Ne Nederland, CO
Apr 27, 10:45 AM MDTSNOW 61 S St Marys Glacier, CO
Apr 27, 10:45 AM MDTSNOW 6.33 E Conifer, CO
Apr 27, 11:10 AM MDTSNOW 6.81 N Genesee, CO.
Apr 27, 11:10 AM MDTSNOW 6.81 N Genesee, CO
Apr 27, 11:32 AM MDTSNOW 8.11 W Aspen Springs, CO
Apr 27, 12:00 PM MDTSNOW 23 Wnw Parker, CO
Apr 27, 12:16 PM MDTSNOW 7.91 N Genesee, CO
Apr 27, 12:49 PM MDTSNOW 211 S Rabbit Ears Pass, COBUFFALO PARK SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO.
Apr 27, 12:49 PM MDTSNOW 211 S Rabbit Ears Pass, COBUFFALO PARK SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO
Apr 27, 12:49 PM MDTSNOW 29 Sse Spicer, COARAPAHO RIDGE SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO.
Apr 27, 12:49 PM MDTSNOW 29 Sse Spicer, COARAPAHO RIDGE SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO
Apr 27, 12:49 PM MDTSNOW 35 Wsw Winter Park, COFOOL CREEK SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO.
Apr 27, 12:49 PM MDTSNOW 35 Wsw Winter Park, COFOOL CREEK SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO
Apr 27, 12:49 PM MDTSNOW 41 Sse Loveland Pass, COGRIZZLY PEAK SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO.
Apr 27, 12:49 PM MDTSNOW 41 Sse Loveland Pass, COGRIZZLY PEAK SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO
Apr 27, 12:49 PM MDTSNOW 45 W Green Mountain Rese, COELLIOT RIDGE SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO.
Apr 27, 12:49 PM MDTSNOW 45 W Green Mountain Rese, COELLIOT RIDGE SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO
Apr 27, 12:49 PM MDTSNOW 51 W Copper Mountain, COCOPPER MOUNTAIN SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO.
Apr 27, 12:49 PM MDTSNOW 51 W Copper Mountain, COCOPPER MOUNTAIN SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO
Apr 27, 12:49 PM MDTSNOW 56 W Arapahoe Peak, COHIGH LONESOME SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO.
Apr 27, 12:49 PM MDTSNOW 56 W Arapahoe Peak, COHIGH LONESOME SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO
Apr 27, 12:49 PM MDTSNOW 57 Nw Red Feather Lakes, COBLACK MOUNTAIN SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO.
Apr 27, 12:49 PM MDTSNOW 57 Nw Red Feather Lakes, COBLACK MOUNTAIN SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO
Apr 27, 12:49 PM MDTSNOW 58 Sse Rand, COWILLOW CREEK PASS SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO.
Apr 27, 12:49 PM MDTSNOW 58 Sse Rand, COWILLOW CREEK PASS SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO
Apr 27, 12:49 PM MDTSNOW 59 Se Weston Pass, COROUGH AND TUMBLE SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO.
Apr 27, 12:49 PM MDTSNOW 59 Se Weston Pass, COROUGH AND TUMBLE SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO
Apr 27, 12:49 PM MDTSNOW 61 Nnw Berthoud Pass, COBERTHOUD SUMMIT SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO.
Apr 27, 12:49 PM MDTSNOW 61 Nnw Berthoud Pass, COBERTHOUD SUMMIT SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO
Apr 27, 12:49 PM MDTSNOW 66 Nw Silverthorne, COSUMMIT RANCH SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO.
Apr 27, 12:49 PM MDTSNOW 66 Nw Silverthorne, COSUMMIT RANCH SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO
Apr 27, 12:49 PM MDTSNOW 71 Nw Climax, COFREMONT PASS SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO.
Apr 27, 12:49 PM MDTSNOW 71 Nw Climax, COFREMONT PASS SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO
Apr 27, 12:49 PM MDTSNOW 75 Wsw Grand Lake, COSTILLWATER CREEK SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO.
Apr 27, 12:49 PM MDTSNOW 75 Wsw Grand Lake, COSTILLWATER CREEK SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO
Apr 27, 12:49 PM MDTSNOW 75 Wsw Guanella Pass, COJACKWHACKER GULCH SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO.
Apr 27, 12:49 PM MDTSNOW 75 Wsw Guanella Pass, COJACKWHACKER GULCH SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO
Apr 27, 12:49 PM MDTSNOW 81 Wnw Loveland Pass, COLOVELAND BASIN SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO.
Apr 27, 12:49 PM MDTSNOW 81 Wnw Loveland Pass, COLOVELAND BASIN SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO
Apr 27, 12:49 PM MDTSNOW 88 Nw Glendevey, COROACH SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO.
Apr 27, 12:49 PM MDTSNOW 88 Nw Glendevey, COROACH SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO
Apr 27, 12:49 PM MDTSNOW 93 Wnw Alma, COBUCKSKIN JOE SNOTEL SNOWFALL BETWEEN 5 PM 04/26/2024 AND 11 AM 04/27/2024 ESTIMATED USING A 10 TO 1 SNOW-TO-LIQUID RATIO.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 7.6 hours before the alert went out and 258 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.

Skew-T log-pSkew-T log-p diagram, Grand Junction, CO at 12:00Z on 2024-04-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Grand Junction, CO at 12:00Z on 2024-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 58 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1804 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
58 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

870 
WWUS45 KBOU 261936
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
136 PM MDT Fri Apr 26 2024

COZ033-034-271200-
/O.UPG.KBOU.WS.A.0016.240427T0000Z-240428T1200Z/
/O.NEW.KBOU.WS.W.0013.240427T0300Z-240428T0600Z/
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-
Including the cities of Eisenhower Tunnel, Rabbit Ears Range,
Breckenridge, Rocky Mountain National Park, Indian Peaks, Mount
Blue Sky, Berthoud Pass, Williams Fork Mountains, Cameron Pass,
Willow Creek Pass, East Slopes Mosquito Range, East Slopes
Southern Gore Range, Kenosha Mountains, Winter Park, and Laramie
and Medicine Bow Mountains
136 PM MDT Fri Apr 26 2024

...WINTER STORM WARNING IN EFFECT FROM 9 PM THIS EVENING TO MIDNIGHT 
MDT SATURDAY NIGHT...

* WHAT...Heavy snow expected. Total snow accumulations between 1 and 
  3 feet possible along and east of the Continental Divide. Total 
  snow accumulations between 6 and 12 inches possible west of the 
  Continental Divide and in Summit County. Heaviest snow expected 
  above 9,500 feet.

* WHERE...Rocky Mountain National Park and the Medicine Bow Range, 
  and The Mountains of Summit County, the Mosquito Range, and the 
  Indian Peaks.

* WHEN...From 9 PM this evening to midnight MDT Saturday Night. 
  Heaviest snow is expected Saturday morning.

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

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.

&&

$$

COZ035-036-271200-
/O.UPG.KBOU.WS.A.0016.240427T0600Z-240428T1200Z/
/O.NEW.KBOU.WS.W.0013.240427T0900Z-240428T1200Z/
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-
Including the cities of Evergreen, Idaho Springs, Red Feather
Lakes, Central City, Georgetown, Bailey, Estes Park, Westcreek,
Glendevey, and Nederland
136 PM MDT Fri Apr 26 2024

...WINTER STORM WARNING IN EFFECT FROM 3 AM SATURDAY TO 6 AM MDT 
SUNDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 1 and 
  2 feet possible above 8,500 feet, and between 4 and 12 inches 
  possible below 8,500 feet.

* WHERE...The Northern Front Range Foothills, and The Southern Front 
  Range Foothills.

* WHEN...From 3 AM Saturday to 6 AM MDT Sunday. Heaviest snow 
  Saturday morning, but continuing throughout the day.

* IMPACTS...Travel may become very difficult to impossible due to 
  heavy snowfall on roadways. Additionally, the heavy and wet snow 
  could damage trees.

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.

&&

$$

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

Rodriguez
4 follow-up statements
107 
WWUS45 KBOU 270238
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
838 PM MDT Fri Apr 26 2024

COZ033-034-271100-
/O.CON.KBOU.WS.W.0013.240427T0300Z-240428T0600Z/
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-
Including the cities of Williams Fork Mountains, Laramie and
Medicine Bow Mountains, Breckenridge, Willow Creek Pass, Indian
Peaks, Cameron Pass, Rabbit Ears Range, Rocky Mountain National
Park, Eisenhower Tunnel, East Slopes Mosquito Range, Kenosha
Mountains, Mount Blue Sky, Winter Park, Berthoud Pass, and East
Slopes Southern Gore Range
838 PM MDT Fri Apr 26 2024

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT 
SATURDAY NIGHT...

* WHAT...Heavy snow expected. Total snow accumulations between 1 and 
  3 feet possible along and east of the Continental Divide. Total 
  snow accumulations between 6 and 12 inches possible west of the 
  Continental Divide and in Summit County. Heaviest snow expected 
  above 9,500 feet.

* WHERE...Rocky Mountain National Park and the Medicine Bow Range, 
  and The Mountains of Summit County, the Mosquito Range, and the 
  Indian Peaks.

* WHEN...Until midnight MDT Saturday Night. Heaviest snow Saturday 
  morning, but continuing throughout the day.

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

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.

&&

$$

COZ035-036-271100-
/O.CON.KBOU.WS.W.0013.240427T0900Z-240428T1200Z/
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-
Including the cities of Idaho Springs, Nederland, Red Feather
Lakes, Georgetown, Evergreen, Glendevey, Central City, Westcreek,
Bailey, and Estes Park
838 PM MDT Fri Apr 26 2024

...WINTER STORM WARNING REMAINS IN EFFECT FROM 3 AM SATURDAY TO 6 AM 
MDT SUNDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 1 and 
  2 feet possible above 8,500 feet, and between 4 and 12 inches 
  possible below 8,500 feet.

* WHERE...The Front Range Foothills.

* WHEN...From 3 AM Saturday to 6 AM MDT Sunday. Heaviest snow 
  Saturday morning, but continuing throughout the day.

* IMPACTS...Travel may become very difficult to impossible due to 
  heavy snowfall on roadways. Additionally, the heavy and wet snow 
  could damage trees.

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.

&&

$$

COZ037-271100-
/O.NEW.KBOU.WW.Y.0022.240427T0300Z-240428T0600Z/
Central and Southeast Park County-
Including the cities of Fairplay, Lake George, South Park, and
Hartsel
838 PM MDT Fri Apr 26 2024

...WINTER WEATHER ADVISORY IN EFFECT UNTIL MIDNIGHT MDT SATURDAY 
NIGHT...

* WHAT...Snow expected. Total snow accumulations between 5 and 10 
  inches.

* WHERE...South Park.

* WHEN...Until midnight MDT Saturday Night.

* IMPACTS...Roads will likely become slick and hazardous. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Roads will be slick resulting in slow and hazardous travel. Allow 
extra time to reach your destination.

&&

$$

COZ041-271100-
/O.NEW.KBOU.WW.Y.0022.240427T1200Z-240428T0600Z/
Elbert/Central and East Douglas Counties Above 6000 Feet-
Including the cities of Larkspur, Fondis, Castle Rock, Elbert,
and Kiowa
838 PM MDT Fri Apr 26 2024

...WINTER WEATHER ADVISORY IN EFFECT FROM 6 AM SATURDAY TO MIDNIGHT 
MDT SATURDAY NIGHT...

* WHAT...Wet slushy snow and expected. Total snow accumulations 3 to 
  8 inches above 6500 feet.

* WHERE...Palmer Divide

* WHEN...From 6 AM Saturday to midnight MDT Saturday Night.

* IMPACTS...Snow and slush covered roads will make travel hazardous 
  Saturday and Saturday evening.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Roads will be slick resulting in slow and hazardous travel. Allow 
extra time to reach your destination.

&&

$$

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

Meier
584 
WWUS45 KBOU 270811
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
211 AM MDT Sat Apr 27 2024

COZ033-034-272000-
/O.CON.KBOU.WS.W.0013.000000T0000Z-240428T0600Z/
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-
Including the cities of Willow Creek Pass, Rocky Mountain
National Park, East Slopes Mosquito Range, Indian Peaks, Laramie
and Medicine Bow Mountains, Rabbit Ears Range, Breckenridge,
Berthoud Pass, East Slopes Southern Gore Range, Williams Fork
Mountains, Eisenhower Tunnel, Winter Park, Cameron Pass, Mount
Blue Sky, and Kenosha Mountains
211 AM MDT Sat Apr 27 2024

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT 
TONIGHT...

* WHAT...Heavy snow expected. Total snow accumulations between 1 and 
  3 feet possible along and east of the Continental Divide. Total 
  snow accumulations between 6 and 12 inches possible west of the 
  Continental Divide and in Summit County. Heaviest snow expected 
  above 9,500 feet.

* WHERE...Rocky Mountain National Park and the Medicine Bow Range, 
  and The Mountains of Summit County, the Mosquito Range, and the 
  Indian Peaks.

* WHEN...Until midnight MDT tonight. Heaviest snow this morning, but 
  continuing through this evening.

* IMPACTS...Roads will likely become slick, snow covered and 
  hazardous. Travel could be very difficult to impossible.

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.

&&

$$

COZ035-036-272000-
/O.CON.KBOU.WS.W.0013.240427T0900Z-240428T1200Z/
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-
Including the cities of Estes Park, Nederland, Central City,
Glendevey, Bailey, Idaho Springs, Evergreen, Westcreek, Red
Feather Lakes, and Georgetown
211 AM MDT Sat Apr 27 2024

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

* WHAT...Heavy snow expected. Total snow accumulations between 1 and 
  2 feet possible above 8,000 feet, and between 4 and 12 inches 
  possible below 8,500 feet.

* WHERE...The Front Range Foothills.

* WHEN...Until 6 AM MDT Sunday.

* IMPACTS...Travel could be very difficult to impossible. 

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.

&&

$$

COZ041-272000-
/O.EXT.KBOU.WW.Y.0022.240427T0900Z-240428T0600Z/
Elbert/Central and East Douglas Counties Above 6000 Feet-
Including the cities of Larkspur, Elbert, Kiowa, Fondis, and
Castle Rock
211 AM MDT Sat Apr 27 2024

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL MIDNIGHT MDT 
TONIGHT...

* WHAT...Wet and slushy snow is expected. Total snow accumulations 4 
  to 12 inches, heaviest above 6500 feet.

* WHERE...Palmer Divide

* WHEN...Until midnight MDT tonight.

* IMPACTS...Snow and slush covered roads will make travel hazardous 
  today through this evening.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Roads will be slick resulting in slow and hazardous travel. Allow 
extra time to reach your destination.

&&

$$

COZ037-272000-
/O.CON.KBOU.WW.Y.0022.000000T0000Z-240428T0600Z/
Central and Southeast Park County-
Including the cities of Lake George, South Park, Fairplay, and
Hartsel
211 AM MDT Sat Apr 27 2024

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT 
TONIGHT...

* WHAT...Snow expected. Total snow accumulations between 5 and 12 
  inches.

* WHERE...South Park.

* WHEN...Until midnight MDT tonight.

* IMPACTS...Be prepared for hazardous travel.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Roads will be slick and snow covered, resulting in slow and 
hazardous travel. Allow extra time to reach your destination.

&&

$$

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

Cooper
782 
WWUS45 KBOU 271950
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
150 PM MDT Sat Apr 27 2024

COZ033-034-280600-
/O.CON.KBOU.WS.W.0013.000000T0000Z-240428T0600Z/
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-
Including the cities of Kenosha Mountains, Winter Park, Willow
Creek Pass, Eisenhower Tunnel, Rabbit Ears Range, Laramie and
Medicine Bow Mountains, Mount Blue Sky, East Slopes Mosquito
Range, Berthoud Pass, Rocky Mountain National Park, Breckenridge,
Williams Fork Mountains, East Slopes Southern Gore Range, Indian
Peaks, and Cameron Pass
150 PM MDT Sat Apr 27 2024

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT 
TONIGHT...

* WHAT...Moderate to heavy snow. Additional snow accumulations up to 
  6 inches, locally up to 8 inches.

* WHERE...Rocky Mountain National Park and the Medicine Bow Range, 
  and The Mountains of Summit County, the Mosquito Range, and the 
  Indian Peaks.

* WHEN...Until midnight MDT tonight.

* IMPACTS...Roads will likely become slick, snow covered and 
  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.

&&

$$

COZ035-036-280600-
/O.CON.KBOU.WS.W.0013.000000T0000Z-240428T1200Z/
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-
Including the cities of Georgetown, Evergreen, Central City,
Estes Park, Idaho Springs, Bailey, Red Feather Lakes, Nederland,
Glendevey, and Westcreek
150 PM MDT Sat Apr 27 2024

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

* WHAT...Moderate to heavy snow. Additional snow accumulations up to 
  6 inches.

* WHERE...The Front Range Foothills.

* WHEN...Until 6 AM MDT Sunday.

* IMPACTS...Travel may become very difficult due to heavy snowfall 
  on roadways. Additionally, the heavy and wet snow could damage 
  trees.

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.

&&

$$

COZ037-280600-
/O.CON.KBOU.WW.Y.0022.000000T0000Z-240428T0600Z/
Central and Southeast Park County-
Including the cities of South Park, Hartsel, Lake George, and
Fairplay
150 PM MDT Sat Apr 27 2024

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT 
TONIGHT...

* WHAT...Snow. Additional snow accumulations up to two inches.

* WHERE...South Park.

* WHEN...Until midnight MDT tonight.

* IMPACTS...Be prepared for hazardous travel.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Roads will be slick and snow covered, resulting in slow and 
hazardous travel. Allow extra time to reach your destination.

&&

$$

COZ041-280600-
/O.CON.KBOU.WW.Y.0022.000000T0000Z-240428T0600Z/
Elbert/Central and East Douglas Counties Above 6000 Feet-
Including the cities of Fondis, Kiowa, Elbert, Castle Rock, and
Larkspur
150 PM MDT Sat Apr 27 2024

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT 
TONIGHT...

* WHAT...Wet snow. Additional snow accumulations up to 4 inches.

* WHERE...Palmer Divide

* WHEN...Until midnight MDT tonight.

* IMPACTS...Snow and slush covered roads will make travel hazardous 
  this evening.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Roads will be slick resulting in slow and hazardous travel. Allow 
extra time to reach your destination.

&&

$$

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

Mensch
381 
WWUS45 KBOU 280602
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
1202 AM MDT Sun Apr 28 2024

COZ035-036-280715-
/O.CAN.KBOU.WS.W.0013.000000T0000Z-240428T1200Z/
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-
Including the cities of Georgetown, Westcreek, Evergreen,
Nederland, Bailey, Red Feather Lakes, Idaho Springs, Central
City, Estes Park, and Glendevey
1202 AM MDT Sun Apr 28 2024

...WINTER STORM WARNING IS CANCELLED...

The threat has ended.

$$

COZ033-034-280715-
/O.EXP.KBOU.WS.W.0013.000000T0000Z-240428T0600Z/
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-
Including the cities of Rocky Mountain National Park, Berthoud
Pass, Eisenhower Tunnel, East Slopes Mosquito Range, Cameron
Pass, Mount Blue Sky, Willow Creek Pass, Breckenridge, Laramie
and Medicine Bow Mountains, Indian Peaks, Kenosha Mountains, East
Slopes Southern Gore Range, Williams Fork Mountains, Winter Park,
and Rabbit Ears Range
1202 AM MDT Sun Apr 28 2024

...WINTER STORM WARNING HAS EXPIRED...

$$

COZ037-041-280715-
/O.EXP.KBOU.WW.Y.0022.000000T0000Z-240428T0600Z/
Central and Southeast Park County-Elbert/Central and East Douglas
Counties Above 6000 Feet-
Including the cities of Fairplay, Elbert, Castle Rock, Hartsel,
Larkspur, Kiowa, Lake George, South Park, and Fondis
1202 AM MDT Sun Apr 28 2024

...WINTER WEATHER ADVISORY HAS EXPIRED...

$$

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

Cooper

What forecasters said that day

The local office's own words before this winter storm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Denver/Boulder, CO wrote its last area forecast discussion before this winter storm warning went out at Apr 26, 9:37 AM MDT, 3 hours 59 minutes earlier. Its key messages:

  • Cooler on today, with scattered showers continuing.
  • Significant snowfall for the mountains and higher foothills tonight through Saturday night.
  • Snow level 7000 to 8000 feet MSL.
  • Rain Saturday/Saturday night lower foothills, Urban Corridor, and eastern plains with 1 to 3 inches of rainfall.
Area forecast discussion, Apr 26, 9:37 AM MDT, 3 hours 59 minutes before
Area Forecast Discussion
National Weather Service Denver/Boulder CO
937 AM MDT Fri Apr 26 2024

.KEY MESSAGES...

- Cooler on today, with scattered showers continuing.

- Significant snowfall for the mountains and higher foothills
  tonight through Saturday night.

- Snow level 7000 to 8000 feet MSL.

- Rain Saturday/Saturday night lower foothills, Urban Corridor,
  and eastern plains with 1 to 3 inches of rainfall.

&&

.UPDATE...
Issued at 912 AM MDT Fri Apr 26 2024

Scattered light rain showers continue across the northeast plains
this morning, funneling into the area on the backside of an eject
surface low that will farther into Nebraska by this afternoon.
This should lead to a gradual decrease in showers as very
temporary weak ridging and subsidence builds into our region. It's
been a wet 24-hours for the northeast plains though - we received
a Co-op report of 2.83" south of Sedgwick!

Moisture will take a little bit to climb throughout the column
this afternoon, with satellite imagery showing entirely clear
skies just east of the Continental Divide. Suspect much of the
foothills and urban corridor won't all that much activity until
close to late afternoon. As such, have made some downward
adjustments to precipitation probabilities before activity ramps
up more significantly this evening.

&&

.SHORT TERM /Through tonight/...
Issued at 304 AM MDT Fri Apr 26 2024

The first trough over the northeast plains early this morning,
is expected to lift into NE by 15z. Much of the precipitation
associated with this trough has shifted east of the urban corridor
and wrap around showers should impact the northeast plains the
rest of this morning. Elsewhere, a short wave ridge working its
way into central CO this morning will allow for just isolated to
scattered light showers through midday. Light to moderate QG
ascent early this morning will be replaced by QG descent or
subsidence by midday. Later this afternoon and tonight, the next
transition will kick in. The ridge will shift eastward, with
increasing mid/upper level QG ascent redeveloping ahead of the
next storm system. Increasing mid level instability this afternoon
will allow for primarily scattered showers this afternoon with a
few embedded thunderstorms. I do not anticipate any storms as
strong as what occurred yesterday, but small hail and gusty
outflow winds may accompany these storms. For tonight, increasing
QG ascent with a diffluent pattern ahead of the trough will allow
for snow to increase in coverage and intensity in the mountains,
especially after midnight. Consequently, a winter storm watch will
remain in effect starting tonight through Saturday night. Another
concern will be the higher foothills tonight, especially for
elevations above 8500 feet. The impacts will be strongest for
these areas after 12z Saturday, but snow could get started a
little earlier, so we included zones 35 and 36 in a winter storm
watch as well starting around midnight.

&&

.LONG TERM /Saturday through Thursday/...
Issued at 304 AM MDT Fri Apr 26 2024

Upper level low will be located near the Four Corners 12Z
Saturday. The low slowly travels east-northeast across southern
Colorado Saturday and Saturday night. The low eventually lifts
northeast of Colorado by Sunday morning. Models are in good
agreement on the track and timing of this system. Will see strong
lift from the low and an easterly upslope flow across the Front
Range. Rain and snow become widespread early to mid Saturday
morning and continues through at least Saturday evening.
Precipitation amounts for the Front Range and near by plains have
been running in the 1.50 to 3.00 inch range the last several model
runs. One challenging part of this system will be the snow level.
Wet bulb zero heights greatly vary in the models, anywhere from
7000 feet to a little over 9000 feet. With precipitation rates
expected to be moderate to heavy, will lower the snow level some.
Thinking the snow level ends up 7000 to 8000 feet. Will issue a
Winter Storm Watch for the foothills. Areas above 8000 feet are
expected to see mostly snow come Saturday with 12-18 inches
possible.

Rain and snow is expected to come to an end by Sunday morning
along the Front Range as the upper level low lifts northeast of
Colorado and a northwest downslope develops. Over the plains, rain
should linger into Sunday morning. Cross sections indicate there
should be enough moisture embedded in the northwest flow aloft to
produce snow showers over the mountains Sunday with rain in the
lower valleys. Additional snowfall is expected to be light on
Sunday so plan on ending the Winter Storm Watch at 6AM Sunday
morning. Some of the showers may survive onto the plains Sunday
with additional rainfall amounts on the light side (less than a
quarter inch).

Westerly flow aloft to prevail for much of next week, Monday
through Thursday. Main storm track will be north of Colorado with
the storm systems passing over the Northern Rockies. The first
wave next week passing north of Colorado is on track to be late
Monday. This will bring a chance for showers and storms to the
northern mountains. A cold front associated with the wave will
drop south across Colorado Monday night. Not much cold air behind
it with highs climbing back to around 70 degrees over northeast
Colorado on Tuesday. A second wave will pass north of the state
sometime Wednesday and it sends a cold front south across
northeast Colorado. There are some timing differences with this
system, so highs are a little more uncertain than other days. Best
lift and chance for precipitation stays north of Colorado, but
there's a chance for isolated showers and storms
Wednesday/Wednesday night.

&&

.AVIATION /12Z TAFS through 12Z Saturday/...
Issued at 518 AM MDT Fri Apr 26 2024

Ceilings mainly from 8000 to 10000 feet this morning, as most of
the showers have shifted to the east of the terminals. This should
continue through midday. Light southwest winds this morning
should shift northwest-north after 14z with gusts 20-25 kts
possible until around 22z, then the winds will shift to the
northeast.

Convective showers will increase by 22z with lowering ceilings
expected. Broken-overcast ceilings around 4000-6000 feet will
develop after 22z, then MVFR ceilings and visibilities by 04z
this evening. East/northeast winds tonight 7-11 kts with MVFR/IFR
ceilings/visibilities restrictions developing after 08z as the
rain increases.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
Winter Storm Watch from 6 PM MDT this evening through late
Saturday night for COZ033-034.

Winter Storm Watch from late tonight through late Saturday night
for COZ035-036.

&&

UPDATE...Rodriguez
SHORT TERM...Cooper
LONG TERM...Meier
AVIATION...Cooper
Hazardous weather outlook, Apr 26, 11:34 AM MDT, 2 hours 2 minutes before
Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1134 AM MDT Fri Apr 26 2024

COZ030>051-271745-
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-
1134 AM MDT Fri Apr 26 2024

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

.DAY ONE...Today and Tonight

Moderate rain develops in the urban corridor and foothills this
evening, with moderate snow in the mountains leading to
deteriorating conditions overnight.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

A strong spring storm system will move across Colorado Saturday
bringing widespread rain and mountain snow. The snow level is
expected to fall to 7000 to 8000 feet. Travel into the higher
foothills and mountains will likely be very difficult with 1 to 3
feet of snow expected, with the heavier amounts expected to be in
the northern mountains.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 26, 4:13 PM MDTSpecial Weather StatementBOUElbert47 min
Apr 26, 4:52 PM MDTSpecial Weather StatementBOUBroomfield23 min

Nearby

Winter Storm Warnings in Colorado, 2024Every winter storm warning in 2024

Sources

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