Alert archive / Colorado / Winter Storm Warnings in 2018
Winter Storm Warning 3, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this winter storm warning at Feb 14, 2018, 3:19 AM MST for 9 counties in Colorado. It took effect at Feb 14, 2018, 5:00 PM MST. It was in force for 25 hr. 28 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
- Feb 14, 2018, 3:19 AM MST (10:19 UTC)
- In effect from
- Feb 14, 2018, 5:00 PM MST
- Expired
- Feb 15, 2018, 6:00 PM MST
- In force
- 25 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Boulder County, CO, Clear Creek 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), 102 km from the middle of the area, began a volume at 10:22 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
| Time | Report | Where | Remark |
|---|---|---|---|
| Feb 15, 4:00 AM MST | SNOW 3 | 5 Sw Glendevey, CO | MESONET STATION RAWC2, 5 SW GLENDEVEY. |
| Feb 15, 5:00 AM MST | SNOW 7 | 6 W Four Corners, CO | MESONET STATION ROAC2, 6 W FOUR CORNERS. |
| Feb 15, 6:00 AM MST | SNOW 2 | 5 Nnw Trail Ridge, CO | MESONET STATION LRVC2, 5 NNW TRAIL RIDGE. |
| Feb 15, 6:00 AM MST | SNOW 7 | 8 Ese Four Corners, CO | MESONET STATION DDMC2, 8 ESE FOUR CORNERS. |
| Feb 15, 7:00 AM MST | SNOW 3.1 | Frisco, CO | COCORAHS STATION CO-SU-4, FRISCO. |
| Feb 15, 7:00 AM MST | SNOW 5 | Hohnholz Ranch, CO | CO-OP OBSERVER STATION HORC2, HOHNHOLZ RANCH. |
| Feb 15, 8:00 AM MST | SNOW 3 | 1 W Copper Mountain, CO | MESONET STATION CPMC2, 1 W COPPER MOUNTAIN. |
| Feb 15, 8:00 AM MST | SNOW 3 | 5 Nnw Trail Ridge, CO | MESONET STATION LRVC2, 5 NNW TRAIL RIDGE. |
| Feb 15, 8:00 AM MST | SNOW 3.5 | 2 Sse Breckenridge, CO | |
| Feb 15, 8:00 AM MST | SNOW 4 | 8 Se Rand, CO | MESONET STATION WLLC2, 8 SE RAND. |
| Feb 15, 8:00 AM MST | SNOW 6 | 1 Nnw Cameron Pass, CO | MESONET STATION JWRC2, 1 NNW CAMERON PASS. |
| Feb 15, 8:00 AM MST | SNOW 6 | 8 Ese Four Corners, CO | MESONET STATION DDMC2, 8 ESE FOUR CORNERS. |
| Feb 15, 8:00 AM MST | SNOW 7 | 5 Sw Glendevey, CO | MESONET STATION RAWC2, 5 SW GLENDEVEY. |
| Feb 15, 8:23 AM MST | SNOW 1.5 | 1 Sse Loveland Pass, CO | GRIZZLY PEAK SNOTEL SNOWFALL BETWEEN 4 PM 02/14/2018 AND 7 AM 02/15/2018 ESTIMATED USING A 15.0 TO 1 SNOW-TO-LIQUID RATIO |
| Feb 15, 8:23 AM MST | SNOW 1.5 | 3 Wnw Alma, CO | BUCKSKIN JOE SNOTEL SNOWFALL BETWEEN 4 PM 02/14/2018 AND 7 AM 02/15/2018 ESTIMATED USING A 15.0 TO 1 SNOW-TO-LIQUID RATIO |
| Feb 15, 8:23 AM MST | SNOW 1.5 | 3 Wnw Pingree Park, CO | HOURGLASS LAKE SNOTEL SNOWFALL BETWEEN 4 PM 02/14/2018 AND 7 AM 02/15/2018 ESTIMATED USING A 15.0 TO 1 SNOW-TO-LIQUID RATIO |
| Feb 15, 8:23 AM MST | SNOW 1.5 | 7 Sse Cameron Pass, CO | LAKE IRENE SNOTEL SNOWFALL BETWEEN 4 PM 02/14/2018 AND 7 AM 02/15/2018 ESTIMATED USING A 15.0 TO 1 SNOW-TO-LIQUID RATIO |
| Feb 15, 8:23 AM MST | SNOW 1.5 | 8 Sse Rand, CO | WILLOW CREEK PASS SNOTEL SNOWFALL BETWEEN 4 PM 02/14/2018 AND 7 AM 02/15/2018 ESTIMATED USING A 15.0 TO 1 SNOW-TO-LIQUID RATIO |
| Feb 15, 8:23 AM MST | SNOW 3 | 1 Nne Rabbit Ears Pass, CO | COLUMBINE SNOTEL SNOWFALL BETWEEN 4 PM 02/14/2018 AND 7 AM 02/15/2018 ESTIMATED USING A 15.0 TO 1 SNOW-TO-LIQUID RATIO |
| Feb 15, 8:23 AM MST | SNOW 3 | 1 Nw Climax, CO | FREMONT PASS SNOTEL SNOWFALL BETWEEN 4 PM 02/14/2018 AND 7 AM 02/15/2018 ESTIMATED USING A 15.0 TO 1 SNOW-TO-LIQUID RATIO |
| Feb 15, 8:23 AM MST | SNOW 3 | 1 W Copper Mountain, CO | COPPER MOUNTAIN SNOTEL SNOWFALL BETWEEN 4 PM 02/14/2018 AND 7 AM 02/15/2018 ESTIMATED USING A 15.0 TO 1 SNOW-TO-LIQUID RATIO |
| Feb 15, 8:23 AM MST | SNOW 4.5 | 7 Nw Red Feather Lakes, CO | BLACK MOUNTAIN SNOTEL SNOWFALL BETWEEN 4 PM 02/14/2018 AND 7 AM 02/15/2018 ESTIMATED USING A 15.0 TO 1 SNOW-TO-LIQUID RATIO |
| Feb 15, 8:23 AM MST | SNOW 4.5 | 9 E Glendevey, CO | DEADMAN HILL SNOTEL SNOWFALL BETWEEN 4 PM 02/14/2018 AND 7 AM 02/15/2018 ESTIMATED USING A 15.0 TO 1 SNOW-TO-LIQUID RATIO |
| Feb 15, 8:23 AM MST | HEAVY SNOW 6 | 5 Ssw Glendevey, CO | RAWAH SNOTEL SNOWFALL BETWEEN 4 PM 02/14/2018 AND 7 AM 02/15/2018 ESTIMATED USING A 15.0 TO 1 SNOW-TO-LIQUID RATIO |
| Feb 15, 8:23 AM MST | HEAVY SNOW 6 | 5 W Berthoud Falls, CO | JONES PASS SNOTEL SNOWFALL BETWEEN 4 PM 02/14/2018 AND 7 AM 02/15/2018 ESTIMATED USING A 15.0 TO 1 SNOW-TO-LIQUID RATIO |
| Feb 15, 8:23 AM MST | HEAVY SNOW 6 | 8 Nw Glendevey, CO | ROACH SNOTEL SNOWFALL BETWEEN 4 PM 02/14/2018 AND 7 AM 02/15/2018 ESTIMATED USING A 15.0 TO 1 SNOW-TO-LIQUID RATIO |
| Feb 15, 8:23 AM MST | HEAVY SNOW 7.5 | 9 Ene Steamboat Springs, CO | TOWER SNOTEL SNOWFALL BETWEEN 4 PM 02/14/2018 AND 7 AM 02/15/2018 ESTIMATED USING A 15.0 TO 1 SNOW-TO-LIQUID RATIO |
| Feb 15, 8:23 AM MST | HEAVY SNOW 10.5 | 4 Se Mount Zirkel, CO | ZIRKEL SNOTEL SNOWFALL BETWEEN 4 PM 02/14/2018 AND 7 AM 02/15/2018 ESTIMATED USING A 15.0 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
Denver, CO (KDEN), launched 00:00Z, 10.3 hours before the alert went out and 213 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2631 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 286 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
707 WWUS45 KBOU 141019 WSWBOU URGENT - WINTER WEATHER MESSAGE National Weather Service Denver CO 319 AM MST Wed Feb 14 2018 ...DIFFICULT TRAVEL CONDITIONS TONIGHT AND THURSDAY... .Heavy snow and blowing snow will create difficult travel conditions tonight and Thursday over the higher mountainous terrain of North Central Colorado. Snow will begin late this afternoon and early evening, and continue overnight and Thursday. Snow will be heavy at times, with snowfall rates of 1 to 2 inches an hour possible. Travel tonight and Thursday will be impacted, especially over mountain passes. COZ031-033-034-141830- /O.NEW.KBOU.WS.W.0003.180215T0000Z-180216T0100Z/ Rabbit Ears Pass- Rocky Mountain National Park and the Medicine Bow Range- The Mountains of Summit County, the Mosquito Range, and the Indian Peaks- Including the cities of East Slopes Park and Northern Gore Ranges, Gore Pass, Rabbit Ears Pass, Cameron Pass, Laramie and Medicine Bow Mountains, Rabbit Ears Range, Rocky Mountain National Park, Willow Creek Pass, Berthoud Pass, Breckenridge, East Slopes Mosquito Range, East Slopes Southern Gore Range, Eisenhower Tunnel, Indian Peaks, Kenosha Mountains, Mount Evans, Williams Fork Mountains, and Winter Park 319 AM MST Wed Feb 14 2018 ...WINTER STORM WARNING IN EFFECT FROM 5 PM THIS AFTERNOON TO 6 PM MST THURSDAY... * WHAT...Heavy snow and blowing snow expected. Total snow accumulations of 6 to 10 inches, with localized amounts up to 14 inches, are expected. * WHERE...Rabbit Ears Pass, Rocky Mountain National Park and the Medicine Bow Range and The Mountains of Summit County, the Mosquito Range, and the Indian Peaks. * WHEN...From 5 PM this afternoon to 6 PM MST Thursday. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Winds gusting as high as 60 mph will cause areas of blowing and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow and blowing snow means severe winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ Hanson
5 follow-up statements
016 WWUS45 KBOU 141719 WSWBOU URGENT - WINTER WEATHER MESSAGE National Weather Service Denver CO 1019 AM MST Wed Feb 14 2018 ...DIFFICULT TRAVEL CONDITIONS TONIGHT AND THURSDAY... .Heavy snow and strong winds will create difficult travel conditions tonight and Thursday over the higher mountainous terrain of North Central Colorado. Snow will begin late this afternoon and early evening over the northern mountains, spreading southward over the I-70 corridor after midnight and continuing overnight and Thursday. Snow will be heavy at times, with snowfall rates of 1 to 2 inches an hour possible. Strong winds up to 60 mph will create low visibility in blowing snow. Travel tonight and Thursday will be impacted, especially over mountain passes. COZ034-150200- /O.EXT.KBOU.WS.W.0003.180215T0700Z-180216T0100Z/ The Mountains of Summit County, the Mosquito Range, and the Indian Peaks- Including the cities of Berthoud Pass, Breckenridge, East Slopes Mosquito Range, East Slopes Southern Gore Range, Eisenhower Tunnel, Indian Peaks, Kenosha Mountains, Mount Evans, Williams Fork Mountains, and Winter Park 1019 AM MST Wed Feb 14 2018 ...WINTER STORM WARNING NOW IN EFFECT FROM MIDNIGHT TONIGHT TO 6 PM MST THURSDAY... * WHAT...Heavy snow and blowing snow expected. Total snow accumulations of 4 to 8 inches, with localized amounts up to 10 inches, are expected. * WHERE...The Mountains of Summit County, the Mosquito Range, and the Indian Peaks. * WHEN...From midnight tonight to 6 PM MST Thursday. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Winds gusting as high as 60 mph will cause low visibility in areas of blowing and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow and blowing snow means severe winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ COZ031-033-150200- /O.CON.KBOU.WS.W.0003.180215T0000Z-180216T0100Z/ Rabbit Ears Pass- Rocky Mountain National Park and the Medicine Bow Range- Including the cities of East Slopes Park and Northern Gore Ranges, Gore Pass, Rabbit Ears Pass, Cameron Pass, Laramie and Medicine Bow Mountains, Rabbit Ears Range, Rocky Mountain National Park, and Willow Creek Pass 1019 AM MST Wed Feb 14 2018 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO 6 PM MST THURSDAY... * WHAT...Heavy snow and blowing snow expected. Total snow accumulations of 6 to 10 inches, with localized amounts up to 15 inches, are expected. * WHERE...Rabbit Ears Pass and Rocky Mountain National Park and the Medicine Bow Range. * WHEN...From 5 PM this afternoon to 6 PM MST Thursday. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Winds gusting as high as 60 mph will cause low visibility in areas of blowing and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow and blowing snow means severe winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
828 WWUS45 KBOU 142256 WSWBOU URGENT - WINTER WEATHER MESSAGE National Weather Service Denver CO 356 PM MST Wed Feb 14 2018 ...DIFFICULT TRAVEL CONDITIONS TONIGHT AND THURSDAY... .Heavy snow and strong winds will create difficult travel conditions tonight and Thursday over the higher mountainous terrain of North Central Colorado. Snow will begin this evening over the northern mountains, spreading southward over the I-70 corridor after midnight and continue on Thursday. Snow will be heavy at times, with snowfall rates of 1 to 2 inches an hour possible. Strong winds up to 60 mph will create low visibility in blowing snow. Travel tonight and Thursday will be impacted, especially over mountain passes. COZ031-033-150700- /O.CON.KBOU.WS.W.0003.180215T0000Z-180216T0100Z/ Rabbit Ears Pass- Rocky Mountain National Park and the Medicine Bow Range- Including the cities of East Slopes Park and Northern Gore Ranges, Gore Pass, Rabbit Ears Pass, Cameron Pass, Laramie and Medicine Bow Mountains, Rabbit Ears Range, Rocky Mountain National Park, and Willow Creek Pass 356 PM MST Wed Feb 14 2018 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MST THURSDAY... * WHAT...Heavy snow and blowing snow expected. Total snow accumulations of 6 to 12 inches, with localized amounts up to 16 inches, are expected. * WHERE...Rabbit Ears Pass and Rocky Mountain National Park and the Medicine Bow Range. * WHEN...Until 6 PM MST Thursday. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Winds gusting as high as 55 mph will cause areas of blowing and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow and blowing snow means severe winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ COZ034-150700- /O.CON.KBOU.WS.W.0003.180215T0700Z-180216T0100Z/ The Mountains of Summit County, the Mosquito Range, and the Indian Peaks- Including the cities of Berthoud Pass, Breckenridge, East Slopes Mosquito Range, East Slopes Southern Gore Range, Eisenhower Tunnel, Indian Peaks, Kenosha Mountains, Mount Evans, Williams Fork Mountains, and Winter Park 356 PM MST Wed Feb 14 2018 ...WINTER STORM WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 6 PM MST THURSDAY... * WHAT...Heavy snow and blowing snow expected. Total snow accumulations of 5 to 10 inches, with localized amounts up to 14 inches, are expected. * WHERE...The Mountains of Summit County, the Mosquito Range, and the Indian Peaks. * WHEN...From midnight tonight to 6 PM MST Thursday. * ADDITIONAL DETAILS...Plan on difficult travel conditions, including during the morning commute on Thursday. Winds gusting as high as 55 mph will cause areas of blowing and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow and blowing snow means severe winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
442 WWUS45 KBOU 150448 WSWBOU URGENT - WINTER WEATHER MESSAGE National Weather Service Denver CO 948 PM MST Wed Feb 14 2018 ...DIFFICULT TRAVEL CONDITIONS OVERNIGHT INTO THURSDAY... .Heavy snow and strong winds will create difficult travel conditions later tonight and Thursday over the higher mountainous terrain of North Central Colorado. Snow will increase overnight in the mountains and continue on Thursday. Snow will be heavy at times, with snowfall rates of 1 to 2 inches an hour possible. Strong winds up to 60 mph will create low visibility in blowing snow. Travel overnight and Thursday will be impacted, especially over mountain passes. COZ031-033-151300- /O.CON.KBOU.WS.W.0003.000000T0000Z-180216T0100Z/ Rabbit Ears Pass- Rocky Mountain National Park and the Medicine Bow Range- Including the cities of East Slopes Park and Northern Gore Ranges, Gore Pass, Rabbit Ears Pass, Cameron Pass, Laramie and Medicine Bow Mountains, Rabbit Ears Range, Rocky Mountain National Park, and Willow Creek Pass 948 PM MST Wed Feb 14 2018 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MST THURSDAY... * WHAT...Heavy snow and blowing snow expected. Total snow accumulations of 6 to 12 inches, with localized amounts up to 16 inches, are expected. * WHERE...Rabbit Ears Pass and Rocky Mountain National Park and the Medicine Bow Range. * WHEN...Until 6 PM MST Thursday. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Winds gusting as high as 55 mph will cause areas of blowing and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow and blowing snow means severe winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ COZ034-151300- /O.CON.KBOU.WS.W.0003.180215T0700Z-180216T0100Z/ The Mountains of Summit County, the Mosquito Range, and the Indian Peaks- Including the cities of Berthoud Pass, Breckenridge, East Slopes Mosquito Range, East Slopes Southern Gore Range, Eisenhower Tunnel, Indian Peaks, Kenosha Mountains, Mount Evans, Williams Fork Mountains, and Winter Park 948 PM MST Wed Feb 14 2018 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MST THURSDAY... * WHAT...Heavy snow and blowing snow expected. Total snow accumulations of 5 to 10 inches, with localized amounts up to 14 inches, are expected. * WHERE...The Mountains of Summit County, the Mosquito Range, and the Indian Peaks. * WHEN...Until 6 PM MST Thursday. * ADDITIONAL DETAILS...Plan on difficult travel conditions, including during the morning commute on Thursday. Winds gusting as high as 55 mph will cause areas of blowing and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow and blowing snow means severe winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
229 WWUS45 KBOU 151203 WSWBOU URGENT - WINTER WEATHER MESSAGE National Weather Service Denver CO 503 AM MST Thu Feb 15 2018 ...DIFFICULT TRAVEL CONDITIONS IN THE MOUNTAINS TODAY... .Heavy snow and strong winds will create difficult travel conditions through this evening over the higher mountainous terrain of North Central Colorado. Snow will be heavy at times, with snowfall rates of 1 to 2 inches an hour possible. Strong winds up to 50 mph will create low visibility in blowing snow. Travel today will be impacted, especially over mountain passes. COZ031-033-152215- /O.CON.KBOU.WS.W.0003.000000T0000Z-180216T0100Z/ Rabbit Ears Pass- Rocky Mountain National Park and the Medicine Bow Range- Including the cities of East Slopes Park and Northern Gore Ranges, Gore Pass, Rabbit Ears Pass, Cameron Pass, Laramie and Medicine Bow Mountains, Rabbit Ears Range, Rocky Mountain National Park, and Willow Creek Pass 503 AM MST Thu Feb 15 2018 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MST THIS EVENING... * WHAT...Heavy snow and blowing snow. Additional snow accumulations of 4 to 8 inches are expected. * WHERE...Rabbit Ears Pass and Rocky Mountain National Park and the Medicine Bow Range. * WHEN...Until 6 PM MST this evening. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Winds gusting as high as 40 mph will cause areas of blowing and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow and blowing snow means severe winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ COZ034-152215- /O.CON.KBOU.WS.W.0003.000000T0000Z-180216T0100Z/ The Mountains of Summit County, the Mosquito Range, and the Indian Peaks- Including the cities of Berthoud Pass, Breckenridge, East Slopes Mosquito Range, East Slopes Southern Gore Range, Eisenhower Tunnel, Indian Peaks, Kenosha Mountains, Mount Evans, Williams Fork Mountains, and Winter Park 503 AM MST Thu Feb 15 2018 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MST THIS EVENING... * WHAT...Heavy snow and blowing snow. Additional snow accumulations of 4 to 8 inches are expected. * WHERE...The Mountains of Summit County, the Mosquito Range, and the Indian Peaks. * WHEN...Until 6 PM MST this evening. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Winds gusting as high as 50 mph will cause areas of blowing and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow and blowing snow means severe winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
793 WWUS45 KBOU 151837 WSWBOU URGENT - WINTER WEATHER MESSAGE National Weather Service Denver CO 1137 AM MST Thu Feb 15 2018 ...HAZARDOUS TRAVEL CONDITIONS IN THE MOUNTAINS THROUGH EARLY EVENING... .Snow, heavy at times, and gusty winds will create hazardous travel conditions across the Colorado mountains through early this evening. Snowfall rates in the heavier snow showers will range between 1 and 2 inch per hour. Some of this heavier snow will spread across the I-70 Mountain Corridor between Vail Pass and the Eisenhower Tunnel this afternoon. Then snow will gradually decrease across the northern mountains this evening. Travelers into the Colorado high country should be prepared for hazardous winter travel and possible travel restrictions. COZ031-033-160100- /O.CON.KBOU.WS.W.0003.000000T0000Z-180216T0100Z/ Rabbit Ears Pass- Rocky Mountain National Park and the Medicine Bow Range- Including the cities of East Slopes Park and Northern Gore Ranges, Gore Pass, Rabbit Ears Pass, Cameron Pass, Laramie and Medicine Bow Mountains, Rabbit Ears Range, Rocky Mountain National Park, and Willow Creek Pass 1137 AM MST Thu Feb 15 2018 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MST THIS EVENING... * WHAT...Snow, heavy at times, and blowing snow. Additional snow accumulations of 1 to 4 inches are expected. * WHERE...Rabbit Ears Pass and Rocky Mountain National Park and the Medicine Bow Range. * WHEN...Until 6 PM MST this evening. * ADDITIONAL DETAILS...Plan on difficult travel conditions, including during the evening commute. Winds gusting as high as 40 mph will cause areas of blowing and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow and blowing snow means severe winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ COZ034-160100- /O.CON.KBOU.WS.W.0003.000000T0000Z-180216T0100Z/ The Mountains of Summit County, the Mosquito Range, and the Indian Peaks- Including the cities of Berthoud Pass, Breckenridge, East Slopes Mosquito Range, East Slopes Southern Gore Range, Eisenhower Tunnel, Indian Peaks, Kenosha Mountains, Mount Evans, Williams Fork Mountains, and Winter Park 1137 AM MST Thu Feb 15 2018 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MST THIS EVENING... * WHAT...Snow, heavy at times, and blowing snow. Additional snow accumulations of 2 to 4 inches are expected. * WHERE...The Mountains of Summit County, the Mosquito Range, and the Indian Peaks. * WHEN...Until 6 PM MST this evening. * ADDITIONAL DETAILS...Plan on difficult travel conditions, including during the evening commute. Winds gusting as high as 40 mph will cause areas of blowing and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow and blowing snow means severe winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
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 Feb 13, 8:50 PM MST, 6 hours 29 minutes earlier.
Area forecast discussion, Feb 13, 8:50 PM MST, 6 hours 29 minutes before
Area Forecast Discussion National Weather Service Denver/Boulder CO 850 PM MST Tue Feb 13 2018 .UPDATE... Issued at 850 PM MST Tue Feb 13 2018 Only minor adjustments to the gridded forecast package this evening. An upper jet moving over the state from the south tonight and tomorrow will increase the flow over the state. An amplified mountain wave is forecast to develop which will produce gusty winds in and near the foothills. The mountain wave structure is expected to remain in place through the day tomorrow, producing the gusty winds into tomorrow evening. Peak gusts could be in the 40 to 50 mph range, strongest from about 6 AM through 2 PM. Areas west of I-25 along with the foothill areas of Larimer County will see the strongest winds. Temperatures tomorrow will be warmer again due to warm advection from the westerly flow. The other thing we will be keeping an eye on is the expected snow in the mountains tomorrow night through Thursday. At that time, moisture will be increasing from the northwest as the entrance region of the upper jet linger over the state. Will not issue any highlights at this time, but a decent shot of snow sure looks to be in store. No other changes to the forecast at this time. && .SHORT TERM...(This evening through Wednesday) Issued at 1219 PM MST Tue Feb 13 2018 The upper low that was over the SW has continued to retrograde into the Pacific with increasing SW flow over the state. Light snow over the northern mountains will be light with lingering moisture and orographics providing for light snow through the day. At lower elevations temperatures will be warmer than the last few days with highs reaching into the mid 50s. A 120+ kt jet streak will make its way NE and into central Colorado overnight greatly increasing SW flow over the mountains and plains. Speeds will gradually increase in the mountains through the early morning hours. Model cross sections are not showing much amplification or stable layer so do not expect winds to make it too far east on the plains but lower foothills out to BJC could gust into the 30s and low 40s at times during the morning hours. Winds will increase however over the far eastern plains with the possibly of light gusting and sustained winds of 12 to 15 mph. RH levels are in the low 20s with decent fuel moisture provided by snow but winds and temperatures reaching into the low 60s for Wednesday will increase fire weather concerns for drier areas. .LONG TERM...(Wednesday night through Tuesday) Issued at 1219 PM MST Tue Feb 13 2018 For Wednesday night through late Thursday, the next upper level disturbance will move across Colorado with more widespread snowfall developing again for the mountains during late Wednesday night and Thursday. With still a fair amount of wind could see advisory amounts, especially over zone 31 and 33. An associated cold front will mover the plains Thursday morning with colder temperatures expected. Moisture looks rather limited so will only have a slight chance of snow expected mainly in the afternoon with increased instability. Following the upper trof on Thursday, Colorado will transition to a drier northwest flow pattern for Friday and Saturday. Still chilly on Friday but warmer on Saturday. Flow aloft shifts back west and southwest by late Saturday and Sunday as next stronger system drops in the Great Basin. This system could effect Colorado in the late Sunday through almost the middle of next week. There are considerable model differences in the handling of the amplification and timing with the incoming wave. The European solution is quicker with the main trof position closer to Colorado with higher chances of precip as early as Sunday evening for the mountains and on the plains by Monday. The GFS is slower and doesn't even bring snow in the mountains until early Tuesday morning. This GFS solution is much slower than the runs from yesterday and ensemble data is quite varied. The Canadian run is even displaced further West. Bottom line, confidence is low on any one solution, and will keep pops chances on the low side and broad brush through early next week. The big contrast is in temperatures where the European solution has a high at Denver of 14, while the GFS has a high of 55 for Monday. Yikes. && .AVIATION...(For the 06Z TAFS through 06Z Wednesday night) Issued at 850 PM MST Tue Feb 13 2018 VFR conditions will prevail through the period as ceilings and visibilities will not be an issue. The main impact affecting operations will be the gusty winds forecast late tonight through tomorrow evening. BJC will see the gustiest winds and for the longest period as sustained winds of 20 to 34 knots are forecast with wind gusts up to 46 knots between 12 and 20Z. Have increased the winds at DEN and APA due to growing confidence that winds will gust to 24 knots during the late morning and early afternoon as a lee trough will be strengthening. Winds will begin to decrease late tomorrow afternoon as the boundary layer begins to decouple. && .BOU WATCHES/WARNINGS/ADVISORIES... None. && UPDATE...Dankers SHORT TERM...Bowen LONG TERM...Entrekin AVIATION...Danielson
Hazardous weather outlook, Feb 13, 10:31 AM MST, 16 hours 48 minutes before
Hazardous Weather Outlook National Weather Service Denver/Boulder CO 1031 AM MST Tue Feb 13 2018 COZ030>051-141745- 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- 1031 AM MST Tue Feb 13 2018 This hazardous weather outlook is for northeast and north central Colorado. .DAY ONE...Today and Tonight It will be mostly sunny and warmer across the Interstate 25 corridor and northeast plains by this afternoon. In the mountains, snow showers will decrease through the morning and be confined mainly to southwest facing slopes. Strong gusty winds to 60 mph are expected to develop in the foothills late tonight. Overnight temperatures will be slightly warmer with lows in the upper 20s. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Gusty winds up to 60 mph will continue into Wednesday across the higher mountains and foothills. Mountain areas are expected to see a period of snow Wednesday night and Thursday. Light snow may spread onto the plains Thursday. After a dry period Friday and through the weekend, the next Pacific system may bring snow to the region by Monday. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today or tonight.
Nearby
Winter Storm Warnings in Colorado, 2018Every winter storm warning in 2018
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.