Alert archive / Colorado / Winter Storm Warnings in 2017
Winter Storm Warning 4, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this winter storm warning at Jan 10, 2017, 11:53 AM MST for 9 counties in Colorado. It took effect at Jan 10, 2017, 5:00 PM MST. It was in force for 31 hr. 2 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
- Jan 10, 2017, 11:53 AM MST (18:53 UTC)
- In effect from
- Jan 10, 2017, 5:00 PM MST
- Expired
- Jan 12, 2017, 12:00 AM MST
- In force
- 31 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 18:55 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 |
|---|---|---|---|
| Jan 11, 9:49 PM MST | HEAVY SNOW 0 | Breckenridge, CO | ACCUMULATED SNOW FROM THE PAST SEVERAL DAYS OF SNOW STORMS CAUSED THE ROOF TO COLLAPSE AT THE VILLAGE AT BRECKENRIDGE CONVENTION CENTER. SPOTTERS IN THE BRECKENRIDGE AREA ESTIMATE THAT ABOUT 40 INCHES OF SNOW HAS FALLEN IN THE PAST WEEK. |
| Jan 11, 10:15 PM MST | SNOW 2 | 4 Ene Nederland, CO |
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 12:00Z, 6.9 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
- 1961 m above ground
- 0-6 km bulk shear
- 65 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 74 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
133 WWUS45 KBOU 101853 WSWBOU URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER/BOULDER CO 1153 AM MST TUE JAN 10 2017 .PERIOD OF HEAVY SNOWFALL AND STRONG GUSTY WINDS RETURN TO THE MOUNTAINS OF NORTHERN COLORADO LATER THIS AFTERNOON AND CONTINUE THROUGH WEDNESDAY AFTERNOON AS ANOTHER BLAST OF WINDS AND DEEP MOISTURE FLOW IN FROM THE NORTHWEST. THE NORTHERN MOUNTAIN RANGES WILL LIKELY FEEL THE BRUNT OF THIS NEXT STORM OVERNIGHT AND WEDNESDAY WHEN NEARLY UP TO TWO FEET OF NEW SNOW ACCUMULATION IS EXPECTED. STRONG WINDS WILL ALSO PRODUCE AREAS OF BLOWING AND DRIFTING PARTICULARLY ON THE HIGH MOUNTAIN PASSES AND UP AROUND THE EISENHOWER TUNNEL. THE WINTRY WEATHER WILL LIKELY CREATE HAZARDOUS DRIVING CONDITIONS AND POSSIBLY CAUSE TRAFFIC DELAYS AND EVEN ROAD CLOSURES. CONDITIONS ARE EXPECTED TO VERY SLOWLY IMPROVE WEDNESDAY AFTERNOON. COZ031-033-110300- /O.NEW.KBOU.WS.W.0004.170111T0000Z-170112T0000Z/ /O.CON.KBOU.WW.Y.0006.000000T0000Z-170111T0000Z/ 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 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 1153 AM MST TUE JAN 10 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... ...WINTER STORM WARNING IN EFFECT FROM 5 PM THIS AFTERNOON TO 5 PM MST WEDNESDAY... THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A WINTER STORM WARNING FOR HEAVY SNOW AND BLOWING SNOW, WHICH IS IN EFFECT FROM 5 PM THIS AFTERNOON TO 5 PM MST WEDNESDAY. * TIMING...SNOWFALL WILL INCREASE LATE THIS AFTERNOON AND WILL BE HEAVY AT TIMES OVERNIGHT THROUGH WEDNESDAY MORNING. THE SNOW AND WIND SHOULD SLOWLY DECREASE WEDNESDAY AFTERNOON. * SNOW ACCUMULATIONS...TOTAL ACCUMULATIONS FROM 12 TO 22 INCHES. * WIND/VISIBILITY...WEST WINDS OF 20 TO 35 MPH WILL PRODUCE AREAS OF BLOWING SNOW. HIGHER EXPOSED AREAS WILL SEE GUSTS IN EXCESS OF 50 MPH WHICH WILL CREATE NEAR WHITEOUT CONDITIONS AT TIMES. * IMPACTS...TRAVEL WILL BECOME HAZARDOUS OVERNIGHT DUE TO HEAVY SNOW, POOR VISIBILITIES, AND DRIFTING SNOW. TRAVEL DELAYS AND ROAD CLOSURES ARE POSSIBLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING MEANS HEAVY SNOW AND BLOWING SNOW CAN SEVERELY REDUCE VISIBILITIES AND CAUSE MAJOR PROBLEMS FOR HIGH COUNTRY TRAVELERS. USE EXTREME CAUTION WHEN TRAVELING IN THE HIGH COUNTRY...ESPECIALLY OVER THE HIGH MOUNTAIN PASSES. TIRE CHAINS OR ADEQUATE SNOW TIRES MAY BE REQUIRED FOR HIGH COUNTRY TRAVELERS. && $$ COZ034-110300- /O.EXT.KBOU.WW.Y.0006.000000T0000Z-170112T0000Z/ SOUTH AND SOUTHEAST GRAND/WEST CENTRAL AND SOUTHWEST BOULDER/ GILPIN/CLEAR CREEK/SUMMIT/NORTH AND WEST PARK COUNTIES ABOVE 9000 FEET- INCLUDING THE CITIES OF BERTHOUD PASS, BRECKENRIDGE, EAST SLOPES MOSQUITO RANGE, EAST SLOPES SOUTHERN GORE RANGE, EISENHOWER TUNNEL, INDIAN PEAKS, KENOSHA MOUNTAINS, MOUNT EVANS, WILLIAMS FORK MOUNTAINS, AND WINTER PARK 1153 AM MST TUE JAN 10 2017 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 5 PM MST WEDNESDAY... * TIMING...PERIODS OF SNOW AND AREAS OF BLOWING SNOW THIS AFTERNOON THROUGH WEDNESDAY AFTERNOON. * SNOW ACCUMULATIONS...TOTAL ACCUMULATIONS OF 5 TO 11 INCHES BY WEDNESDAY AFTERNOON. * WIND/VISIBILITY...WEST WINDS OF 20 TO 35 MPH WILL PRODUCE AREAS OF BLOWING SNOW. HIGHER EXPOSED AREAS WILL SEE GUSTS TO AROUND 60 MPH WHICH COULD SIGNIFICANTLY REDUCE VISIBILITIES ESPECIALLY IN OPEN AREA. * IMPACTS...TRAVEL WILL DIFFICULT IF NOT HAZARDOUS DUE TO THE SNOW, POOR VISIBILITIES, AND STRONG WINDS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW AND BLOWING SNOW MEANS THAT VISIBILITIES WILL BE LIMITED DUE TO A COMBINATION OF FALLING AND BLOWING SNOW. USE CAUTION WHEN TRAVELING... ESPECIALLY IN OPEN AREAS. && $$ BAKER
7 follow-up statements
540 WWUS45 KBOU 110045 WSWBOU URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER/BOULDER CO 545 PM MST TUE JAN 10 2017 .MORE HEAVY SNOWFALL AND STRONG GUSTY WINDS WILL RETURN TO THE MOUNTAINS OF NORTHERN COLORADO THIS EVENING AND CONTINUE THROUGH WEDNESDAY AFTERNOON. THE STRONG AND MOISTURE LADEN WESTERLY FLOW PATTERN THAT HAS BEEN PRODUCING HEAVY SNOWS IN THE MOUNTAIN RANGES OF NORTHERN CALIFORNIA, UTAH AND COLORADO FOR THE PAST SEVERAL DAYS IS STILL REMAINS IN PLACE. THE WESTERN AND NORTHERN MOUNTAIN RANGES OF COLORADO WILL FEEL THE HEAVIEST PART OF THIS NEXT STORM TONIGHT AND WEDNESDAY AS UP TO TWO FEET OF NEW SNOW ACCUMULATION IS EXPECTED. STRONG WINDS WILL ALSO PRODUCE AREAS OF BLOWING AND DRIFTING SNOW, PARTICULARLY ON THE HIGH MOUNTAIN PASSES AND AROUND THE EISENHOWER TUNNEL. THE CONTINUING WINTRY WEATHER WILL CREATE HAZARDOUS DRIVING CONDITIONS, CAUSE TRAFFIC DELAYS AND ROAD CLOSURES. IN ADDITION, THE HEAVY SNOW ACCUMULATIONS OF THE PAST SEVERAL DAYS HAS RAISED AVALANCHE CONDITIONS TO DANGEROUS LEVELS. WEATHER CONDITIONS ARE EXPECTED TO SLOWLY IMPROVE WEDNESDAY AFTERNOON. COZ031-033-110845- /O.CON.KBOU.WS.W.0004.000000T0000Z-170112T0000Z/ WEST JACKSON AND WEST GRAND COUNTIES ABOVE 9000 FEET- SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/ NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET- 545 PM MST TUE JAN 10 2017 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST WEDNESDAY... ...WINTER WEATHER ADVISORY HAS EXPIRED... * TIMING...SNOWFALL WILL INCREASE THROUGH THIS EVENING AND WILL BE HEAVY AT TIMES OVERNIGHT THROUGH WEDNESDAY MORNING. THE SNOW AND WIND SHOULD SLOWLY DECREASE WEDNESDAY AFTERNOON. * SNOW ACCUMULATIONS...TOTAL ACCUMULATIONS FROM 12 TO 22 INCHES. * WIND/VISIBILITY...WEST WINDS OF 20 TO 35 MPH WILL PRODUCE AREAS OF BLOWING SNOW. HIGHER EXPOSED AREAS WILL SEE GUSTS IN EXCESS OF 50 MPH WHICH WILL CREATE NEAR WHITEOUT CONDITIONS AT TIMES. * IMPACTS...TRAVEL MAY BE HAZARDOUS OVERNIGHT DUE TO THE HEAVY SNOW, POOR VISIBILITIES, AND DRIFTING SNOW. TRAVEL DELAYS AND ROAD CLOSURES ARE POSSIBLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING MEANS HEAVY SNOW AND BLOWING SNOW ARE EXPECTED OR OCCURRING. THE HEAVY SNOW AND BLOWING SNOW CAN SEVERELY REDUCE VISIBILITIES AND CAUSE MAJOR PROBLEMS FOR HIGH COUNTRY TRAVELERS. USE EXTREME CAUTION WHEN TRAVELING IN THE HIGH COUNTRY...ESPECIALLY OVER THE HIGH MOUNTAIN PASSES. TIRE CHAINS OR ADEQUATE SNOW TIRES MAY BE REQUIRED FOR HIGH COUNTRY TRAVELERS. THE HEAVY SNOW ACCUMULATIONS OF THE PAST SEVERAL DAYS HAVE ALSO CAUSED THE SNOWPACK TO BECOME UNSTABLE AND SUSCEPTIBLE TO DANGEROUS AVALANCHE ACTIVITY. AVALANCHE WARNINGS HAVE BEEN ISSUED BY THE COLORADO AVALANCHE INFORMATION CENTER, AND BACKCOUNTRY TRAVEL AND ACTIVITIES ARE NOT RECOMMENDED. && $$ COZ034-110845- /O.CON.KBOU.WW.Y.0006.000000T0000Z-170112T0000Z/ SOUTH AND SOUTHEAST GRAND/WEST CENTRAL AND SOUTHWEST BOULDER/ GILPIN/CLEAR CREEK/SUMMIT/NORTH AND WEST PARK COUNTIES ABOVE 9000 FEET- 545 PM MST TUE JAN 10 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST WEDNESDAY... * TIMING...PERIODS OF SNOW AND AREAS OF BLOWING SNOW THIS EVENING THROUGH WEDNESDAY AFTERNOON. * SNOW ACCUMULATIONS...TOTAL ACCUMULATIONS OF 5 TO 11 INCHES BY WEDNESDAY AFTERNOON. * WIND/VISIBILITY...WEST WINDS OF 20 TO 35 MPH WILL PRODUCE AREAS OF BLOWING SNOW. HIGHER EXPOSED AREAS WILL SEE GUSTS TO AROUND 60 MPH WHICH COULD SIGNIFICANTLY REDUCE VISIBILITIES, ESPECIALLY IN OPEN AREAS. * IMPACTS...TRAVEL WILL BE DIFFICULT, IF NOT HAZARDOUS, DUE TO THE SNOW, POOR VISIBILITIES, AND STRONG WINDS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW AND BLOWING SNOW MEANS THAT VISIBILITIES WILL BE LIMITED DUE TO A COMBINATION OF FALLING AND BLOWING SNOW. USE CAUTION WHEN TRAVELING...ESPECIALLY IN OPEN AREAS. && $$
340 WWUS45 KBOU 110519 WSWBOU URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER/BOULDER CO 1019 PM MST TUE JAN 10 2017 .SNOWFALL AND STRONG GUSTY WINDS WILL CONTINUE OVER THE MOUNTAINS OF NORTHERN COLORADO THROUGH TONIGHT AND WEDNESDAY. THE STRONG AND MOISTURE LADEN WESTERLY FLOW PATTERN THAT HAS BEEN PRODUCING HEAVY SNOWS IN THE MOUNTAIN RANGES OF NORTHERN CALIFORNIA, UTAH AND COLORADO OVER THE PAST SEVERAL DAYS IS STILL IN PLACE. THE WESTERN AND NORTHERN MOUNTAIN RANGES OF COLORADO WILL FEEL THE HEAVIEST PART OF THIS NEXT STORM TONIGHT AND WEDNESDAY WITH UP TO TWO FEET OF NEW SNOW ACCUMULATION EXPECTED. STRONG WINDS WILL ALSO PRODUCE AREAS OF BLOWING AND DRIFTING SNOW, PARTICULARLY ON THE HIGH MOUNTAIN PASSES AND AROUND THE EISENHOWER TUNNEL. THE CONTINUING WINTRY WEATHER WILL CREATE HAZARDOUS DRIVING CONDITIONS, CAUSE TRAFFIC DELAYS AND ROAD CLOSURES. IN ADDITION, THE HEAVY SNOW ACCUMULATIONS OF THE PAST SEVERAL DAYS HAS RAISED AVALANCHE CONDITIONS TO DANGEROUS LEVELS. WEATHER CONDITIONS ARE EXPECTED TO SLOWLY IMPROVE WEDNESDAY AFTERNOON AS THE STORM MOVES OFF TO THE EAST. COZ031-033-111330- /O.CON.KBOU.WS.W.0004.000000T0000Z-170112T0000Z/ WEST JACKSON AND WEST GRAND COUNTIES ABOVE 9000 FEET- SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/ NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET- 1019 PM MST TUE JAN 10 2017 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST WEDNESDAY... * TIMING...SNOWFALL WILL BE HEAVY AT TIMES OVERNIGHT THROUGH WEDNESDAY MORNING. THE SNOW AND WIND SHOULD SLOWLY DECREASE WEDNESDAY AFTERNOON. * SNOW ACCUMULATIONS...TOTAL ACCUMULATIONS FROM 12 TO 20 INCHES. * WIND/VISIBILITY...WEST WINDS OF 20 TO 35 MPH WILL PRODUCE AREAS OF BLOWING SNOW. HIGHER EXPOSED AREAS WILL SEE GUSTS IN EXCESS OF 50 MPH WHICH WILL CREATE WHITEOUT CONDITIONS AT TIMES. * IMPACTS...TRAVEL MAY BE HAZARDOUS OVERNIGHT DUE TO THE HEAVY SNOW, POOR VISIBILITIES, AND DRIFTING SNOW. TRAVEL DELAYS AND ROAD CLOSURES ARE POSSIBLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING MEANS HEAVY SNOW AND BLOWING SNOW ARE EXPECTED OR OCCURRING. THE HEAVY SNOW AND BLOWING SNOW CAN SEVERELY REDUCE VISIBILITIES AND CAUSE MAJOR PROBLEMS FOR HIGH COUNTRY TRAVELERS. USE EXTREME CAUTION WHEN TRAVELING IN THE HIGH COUNTRY...ESPECIALLY OVER THE HIGH MOUNTAIN PASSES. TIRE CHAINS OR ADEQUATE SNOW TIRES MAY BE REQUIRED FOR HIGH COUNTRY TRAVELERS. THE HEAVY SNOW ACCUMULATIONS OF THE PAST SEVERAL DAYS HAVE ALSO CAUSED THE SNOWPACK THROUGHOUT THE COLORADO MOUNTAINS TO BECOME UNSTABLE AND SUSCEPTIBLE TO DANGEROUS AVALANCHE ACTIVITY. AVALANCHE WARNINGS HAVE BEEN ISSUED BY THE COLORADO AVALANCHE INFORMATION CENTER, AND BACKCOUNTRY ACTIVITIES AND TRAVEL ARE NOT RECOMMENDED. && $$ COZ034-111330- /O.CON.KBOU.WW.Y.0006.000000T0000Z-170112T0000Z/ SOUTH AND SOUTHEAST GRAND/WEST CENTRAL AND SOUTHWEST BOULDER/ GILPIN/CLEAR CREEK/SUMMIT/NORTH AND WEST PARK COUNTIES ABOVE 9000 FEET- 1019 PM MST TUE JAN 10 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST WEDNESDAY... * TIMING...PERIODS OF SNOW AND AREAS OF BLOWING SNOW THIS EVENING THROUGH WEDNESDAY AFTERNOON. * SNOW ACCUMULATIONS...TOTAL ACCUMULATIONS OF 5 TO 10 INCHES BY WEDNESDAY AFTERNOON. * WIND/VISIBILITY...WEST WINDS OF 25 TO 35 MPH WILL PRODUCE AREAS OF BLOWING SNOW. HIGHER EXPOSED AREAS WILL SEE GUSTS TO AROUND 60 MPH WHICH COULD SIGNIFICANTLY REDUCE VISIBILITIES, ESPECIALLY IN OPEN AREAS. * IMPACTS...TRAVEL WILL BE DIFFICULT, IF NOT HAZARDOUS, DUE TO THE SNOW, POOR VISIBILITIES, AND STRONG WINDS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW AND BLOWING SNOW MEANS THAT VISIBILITIES WILL BE LIMITED DUE TO A COMBINATION OF FALLING AND BLOWING SNOW. USE CAUTION WHEN TRAVELING...ESPECIALLY IN OPEN AREAS. && $$
541 WWUS45 KBOU 110717 WSWBOU URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER/BOULDER CO 1217 AM MST WED JAN 11 2017 .SNOWFALL AND STRONG GUSTY WINDS WILL CONTINUE OVER THE MOUNTAINS OF NORTHERN COLORADO THROUGH TONIGHT AND WEDNESDAY. THE STRONG AND MOISTURE LADEN WESTERLY FLOW PATTERN THAT HAS BEEN PRODUCING HEAVY SNOWS IN THE MOUNTAIN RANGES OF NORTHERN CALIFORNIA, UTAH AND COLORADO OVER THE PAST SEVERAL DAYS IS STILL IN PLACE. THE WESTERN AND NORTHERN MOUNTAIN RANGES OF COLORADO WILL FEEL THE HEAVIEST PART OF THIS NEXT STORM TONIGHT AND WEDNESDAY WITH UP TO TWO FEET OF NEW SNOW ACCUMULATION EXPECTED. STRONG WINDS WILL ALSO PRODUCE AREAS OF BLOWING AND DRIFTING SNOW, PARTICULARLY ON THE HIGH MOUNTAIN PASSES AND AROUND THE EISENHOWER TUNNEL. THE CONTINUING WINTRY WEATHER WILL CREATE HAZARDOUS DRIVING CONDITIONS, CAUSE TRAFFIC DELAYS AND ROAD CLOSURES. IN ADDITION, THE HEAVY SNOW ACCUMULATIONS OF THE PAST SEVERAL DAYS HAS RAISED AVALANCHE CONDITIONS TO DANGEROUS LEVELS. WEATHER CONDITIONS ARE EXPECTED TO SLOWLY IMPROVE WEDNESDAY AFTERNOON AS THE STORM MOVES OFF TO THE EAST. COZ034-111530- /O.UPG.KBOU.WW.Y.0006.000000T0000Z-170112T0000Z/ /O.EXA.KBOU.WS.W.0004.000000T0000Z-170112T0000Z/ SOUTH AND SOUTHEAST GRAND/WEST CENTRAL AND SOUTHWEST BOULDER/ GILPIN/CLEAR CREEK/SUMMIT/NORTH AND WEST PARK COUNTIES ABOVE 9000 FEET- 1217 AM MST WED JAN 11 2017 ...WINTER STORM WARNING IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A WINTER STORM WARNING FOR SNOW AND BLOWING SNOW, WHICH IS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON. THE WINTER WEATHER ADVISORY IS NO LONGER IN EFFECT. * TIMING...SNOWFALL WILL BE HEAVY AT TIMES OVERNIGHT THROUGH WEDNESDAY MORNING. THE SNOW AND WIND SHOULD SLOWLY DECREASE WEDNESDAY AFTERNOON. * SNOW ACCUMULATIONS...TOTAL ACCUMULATIONS OF 8 TO 14 INCHES BY WEDNESDAY AFTERNOON. * WIND/VISIBILITY...WEST WINDS OF 25 TO 35 MPH WILL PRODUCE AREAS OF BLOWING SNOW. HIGHER EXPOSED AREAS WILL SEE GUSTS TO AROUND 60 MPH WHICH COULD SIGNIFICANTLY REDUCE VISIBILITIES, ESPECIALLY IN OPEN AREAS. * IMPACTS...TRAVEL WILL BE DIFFICULT, IF NOT HAZARDOUS, DUE TO THE SNOW, POOR VISIBILITIES, AND STRONG WINDS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT... FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY. THE HEAVY SNOW ACCUMULATIONS OF THE PAST SEVERAL DAYS HAVE ALSO CAUSED THE SNOWPACK THROUGHOUT THE COLORADO MOUNTAINS TO BECOME UNSTABLE AND SUSCEPTIBLE TO DANGEROUS AVALANCHE ACTIVITY. AVALANCHE WARNINGS HAVE BEEN ISSUED BY THE COLORADO AVALANCHE INFORMATION CENTER, AND BACKCOUNTRY ACTIVITIES AND TRAVEL ARE NOT RECOMMENDED. && $$ COZ031-033-111530- /O.CON.KBOU.WS.W.0004.000000T0000Z-170112T0000Z/ WEST JACKSON AND WEST GRAND COUNTIES ABOVE 9000 FEET- SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/ NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET- 1217 AM MST WED JAN 11 2017 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * TIMING...SNOWFALL WILL BE HEAVY AT TIMES OVERNIGHT THROUGH WEDNESDAY MORNING. THE SNOW AND WIND SHOULD SLOWLY DECREASE WEDNESDAY AFTERNOON. * SNOW ACCUMULATIONS...TOTAL ACCUMULATIONS FROM 12 TO 20 INCHES. * WIND/VISIBILITY...WEST WINDS OF 20 TO 35 MPH WILL PRODUCE AREAS OF BLOWING SNOW. HIGHER EXPOSED AREAS WILL SEE GUSTS IN EXCESS OF 50 MPH WHICH WILL CREATE WHITEOUT CONDITIONS AT TIMES. * IMPACTS...TRAVEL MAY BE HAZARDOUS OVERNIGHT DUE TO THE HEAVY SNOW, POOR VISIBILITIES, AND DRIFTING SNOW. TRAVEL DELAYS AND ROAD CLOSURES ARE POSSIBLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING MEANS HEAVY SNOW AND BLOWING SNOW ARE EXPECTED OR OCCURRING. THE HEAVY SNOW AND BLOWING SNOW CAN SEVERELY REDUCE VISIBILITIES AND CAUSE MAJOR PROBLEMS FOR HIGH COUNTRY TRAVELERS. USE EXTREME CAUTION WHEN TRAVELING IN THE HIGH COUNTRY...ESPECIALLY OVER THE HIGH MOUNTAIN PASSES. TIRE CHAINS OR ADEQUATE SNOW TIRES MAY BE REQUIRED FOR HIGH COUNTRY TRAVELERS. THE HEAVY SNOW ACCUMULATIONS OF THE PAST SEVERAL DAYS HAVE ALSO CAUSED THE SNOWPACK THROUGHOUT THE COLORADO MOUNTAINS TO BECOME UNSTABLE AND SUSCEPTIBLE TO DANGEROUS AVALANCHE ACTIVITY. AVALANCHE WARNINGS HAVE BEEN ISSUED BY THE COLORADO AVALANCHE INFORMATION CENTER, AND BACKCOUNTRY ACTIVITIES AND TRAVEL ARE NOT RECOMMENDED. && $$
410 WWUS45 KBOU 111133 WSWBOU URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER/BOULDER CO 433 AM MST WED JAN 11 2017 .SNOWFALL AND GUSTY WINDS WILL CONTINUE OVER THE MOUNTAINS OF NORTHERN COLORADO TODAY. STRONG WINDS WILL ALSO PRODUCE AREAS OF BLOWING AND DRIFTING SNOW, PARTICULARLY ON THE HIGH MOUNTAIN PASSES AND AROUND THE EISENHOWER TUNNEL. THE CONTINUING WINTRY WEATHER WILL CREATE HAZARDOUS DRIVING CONDITIONS, CAUSE TRAFFIC DELAYS AND ROAD CLOSURES. IN ADDITION, THE HEAVY SNOW ACCUMULATIONS OF THE PAST SEVERAL DAYS HAS RAISED AVALANCHE CONDITIONS TO DANGEROUS LEVELS. WEATHER CONDITIONS ARE EXPECTED TO IMPROVE TONIGHT AS THE STORM MOVES OFF TO THE EAST. COZ031-033-034-111945- /O.CON.KBOU.WS.W.0004.000000T0000Z-170112T0000Z/ WEST JACKSON AND WEST GRAND COUNTIES ABOVE 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- 433 AM MST WED JAN 11 2017 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * TIMING...SNOWFALL WILL BE HEAVY AT TIMES THROUGH AFTERNOON. THE SNOW AND WIND SHOULD DECREASE BY THIS EVENING. * SNOW ACCUMULATIONS...ADDITIONAL ACCUMULATIONS OF 4 TO 10 INCHES BY LATE AFTERNOON. * WIND/VISIBILITY...WEST WINDS OF 25 TO 35 MPH WILL PRODUCE AREAS OF BLOWING SNOW. HIGHER EXPOSED AREAS WILL SEE GUSTS TO AROUND 60 MPH WHICH COULD SIGNIFICANTLY REDUCE VISIBILITIES, ESPECIALLY IN OPEN AREAS. * IMPACTS...TRAVEL WILL BE DIFFICULT, IF NOT HAZARDOUS, DUE TO THE SNOW, POOR VISIBILITIES, AND STRONG WINDS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT... FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY. THE HEAVY SNOW ACCUMULATIONS OF THE PAST SEVERAL DAYS HAVE ALSO CAUSED THE SNOWPACK THROUGHOUT THE COLORADO MOUNTAINS TO BECOME UNSTABLE AND SUSCEPTIBLE TO DANGEROUS AVALANCHE ACTIVITY. AVALANCHE WARNINGS HAVE BEEN ISSUED BY THE COLORADO AVALANCHE INFORMATION CENTER, AND BACKCOUNTRY ACTIVITIES AND TRAVEL ARE NOT RECOMMENDED. && $$
392 WWUS45 KBOU 111945 WSWBOU URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER/BOULDER CO 1245 PM MST WED JAN 11 2017 .SNOWFALL AND GUSTY WINDS WILL CONTINUE OVER THE MOUNTAINS OF NORTHERN COLORADO THROUGH THIS EVENING. STRONG WINDS WILL ALSO PRODUCE AREAS OF BLOWING AND DRIFTING SNOW, PARTICULARLY ON THE HIGH MOUNTAIN PASSES AND AROUND THE EISENHOWER TUNNEL. THE CONTINUING WINTRY WEATHER WILL CREATE HAZARDOUS DRIVING CONDITIONS, CAUSE TRAFFIC DELAYS AND ROAD CLOSURES. IN ADDITION, THE HEAVY SNOW ACCUMULATIONS OF THE PAST SEVERAL DAYS HAS RAISED AVALANCHE CONDITIONS TO DANGEROUS LEVELS. WEATHER CONDITIONS ARE EXPECTED TO IMPROVE LATER TONIGHT AS THE STORM MOVES OFF TO THE EAST. COZ031-033-034-120345- /O.EXT.KBOU.WS.W.0004.000000T0000Z-170112T0700Z/ WEST JACKSON AND WEST GRAND COUNTIES ABOVE 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- 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 1245 PM MST WED JAN 11 2017 ...WINTER STORM WARNING NOW IN EFFECT UNTIL MIDNIGHT MST TONIGHT... * TIMING...SNOWFALL WILL BE HEAVY AT TIMES THROUGH THIS EVENING. THE SNOW AND WIND WILL DECREASE FROM LATE EVENING AND OVERNIGHT. * SNOW ACCUMULATIONS...ADDITIONAL ACCUMULATIONS OF 5 TO 12 INCHES BY LATE EVENING. * WIND/VISIBILITY...WEST WINDS OF 25 TO 35 MPH WILL PRODUCE AREAS OF BLOWING SNOW. HIGHER EXPOSED AREAS WILL SEE GUSTS TO AROUND 60 MPH WHICH COULD SIGNIFICANTLY REDUCE VISIBILITIES, ESPECIALLY IN OPEN AREAS. * IMPACTS...TRAVEL WILL BE DIFFICULT, IF NOT HAZARDOUS, DUE TO THE SNOW, POOR VISIBILITIES, AND STRONG WINDS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT... FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY. THE HEAVY SNOW ACCUMULATIONS OF THE PAST SEVERAL DAYS HAVE ALSO CAUSED THE SNOWPACK THROUGHOUT THE COLORADO MOUNTAINS TO BECOME UNSTABLE AND SUSCEPTIBLE TO DANGEROUS AVALANCHE ACTIVITY. AVALANCHE WARNINGS HAVE BEEN ISSUED BY THE COLORADO AVALANCHE INFORMATION CENTER, AND BACKCOUNTRY ACTIVITIES AND TRAVEL ARE NOT RECOMMENDED. && $$
889 WWUS45 KBOU 120419 WSWBOU URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER/BOULDER CO 919 PM MST WED JAN 11 2017 .SNOW AND GUSTY WINDS HAVE CONTINUED IN THE MOUNTAINS OF NORTHERN COLORADO THIS EVENING. FROM 3 TO 6 INCHES OF NEW SNOW HAS FALLEN AT SUMMIT COUNTY SKI AREAS JUST THIS EVENING. GUSTY WINDS ARE ALSO PRODUCING AREAS OF BLOWING AND DRIFTING SNOW, PARTICULARLY OVER THE HIGH MOUNTAIN PASSES AND AROUND THE EISENHOWER TUNNEL. THE CONTINUING WINTRY WEATHER WILL CREATE HAZARDOUS DRIVING CONDITIONS, CAUSE TRAFFIC DELAYS AND ROAD CLOSURES. IN ADDITION, THE HEAVY SNOW ACCUMULATIONS OF THE PAST SEVERAL DAYS HAS RAISED AVALANCHE CONDITIONS TO DANGEROUS LEVELS. WEATHER CONDITIONS ARE EXPECTED TO IMPROVE AFTER MIDNIGHT AS THE STORM MOVES OFF TO THE EAST. COZ031-033-034-120700- /O.CON.KBOU.WS.W.0004.000000T0000Z-170112T0700Z/ WEST JACKSON AND WEST GRAND COUNTIES ABOVE 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- 919 PM MST WED JAN 11 2017 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT... * TIMING...SNOWFALL WILL BE HEAVY AT TIMES THROUGH THIS EVENING. THE SNOW AND WIND WILL DECREASE AFTER MIDNIGHT. * SNOW ACCUMULATIONS...ADDITIONAL ACCUMULATIONS OF 3 TO 6 INCHES, MAINLY BEFORE MIDNIGHT. * WIND/VISIBILITY...WEST WINDS OF 20 TO 30 MPH WILL PRODUCE AREAS OF BLOWING SNOW. HIGHER EXPOSED AREAS WILL SEE GUSTS TO AROUND 45 MPH WHICH COULD SIGNIFICANTLY REDUCE VISIBILITIES, ESPECIALLY IN OPEN AREAS. * IMPACTS...TRAVEL WILL BE DIFFICULT, IF NOT HAZARDOUS, DUE TO THE SNOW, POOR VISIBILITIES, AND STRONG WINDS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT... FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY. THE HEAVY SNOW ACCUMULATIONS OF THE PAST SEVERAL DAYS HAVE ALSO CAUSED THE SNOWPACK THROUGHOUT THE COLORADO MOUNTAINS TO BECOME UNSTABLE AND SUSCEPTIBLE TO DANGEROUS OR EXTREME AVALANCHE ACTIVITY. AVALANCHE WARNINGS HAVE BEEN ISSUED BY THE COLORADO AVALANCHE INFORMATION CENTER, AND TRAVEL INTO THE BACKCOUNTRY IS NOT RECOMMENDED. && $$
744 WWUS45 KBOU 120651 WSWBOU URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER/BOULDER CO 1151 PM MST WED JAN 11 2017 COZ031-033-034-120800- /O.EXP.KBOU.WS.W.0004.000000T0000Z-170112T0700Z/ WEST JACKSON AND WEST GRAND COUNTIES ABOVE 9000 FEET- SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/ NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET- SOUTH AND SOUTHEAST GRAND/WEST CENTRAL AND SOUTHWEST BOULDER/ GILPIN/CLEAR CREEK/SUMMIT/NORTH AND WEST PARK COUNTIES ABOVE 9000 FEET- INCLUDING THE CITIES OF EAST SLOPES PARK AND NORTHERN GORE RANGES, GORE PASS, RABBIT EARS PASS, CAMERON PASS, LARAMIE AND MEDICINE BOW MOUNTAINS, RABBIT EARS RANGE, ROCKY MOUNTAIN NATIONAL PARK, WILLOW CREEK PASS, BERTHOUD PASS, BRECKENRIDGE, EAST SLOPES MOSQUITO RANGE, EAST SLOPES SOUTHERN GORE RANGE, EISENHOWER TUNNEL, INDIAN PEAKS, KENOSHA MOUNTAINS, MOUNT EVANS, WILLIAMS FORK MOUNTAINS, AND WINTER PARK 1151 PM MST WED JAN 11 2017 ...WINTER STORM WARNING WILL EXPIRE AT MIDNIGHT MST TONIGHT... LIGHT SNOW IN THE HIGH COUNTRY WILL GRADUALLY DECREASE OVERNIGHT WITH ADDITIONAL ACCUMULATIONS OF 1 TO 3 INCHES ALONG THE HIGHER WEST FACING SLOPES. ANOTHER WEAK SYSTEM IS EXPECTED TO MOVE ACROSS COLORADO THURSDAY AFTERNOON AND THURSDAY NIGHT WITH ANOTHER PERIOD OF LIGHT TO MODERATE SNOWFALL AT THAT TIME. ALTHOUGH THE SNOW IS DECREASING, TRAVEL WILL BE DIFFICULT DUE TO ICY AND SNOWPACKED ROADS. $$
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 Jan 10, 11:07 AM MST, 46 minutes earlier.
Area forecast discussion, Jan 10, 11:07 AM MST, 46 minutes before
Area Forecast Discussion National Weather Service Denver/Boulder CO 1107 AM MST Tue Jan 10 2017 .UPDATE... Issued at 1100 AM MST Tue Jan 10 2017 Changes on the way to winter weather highlights for the next 24 hours. First...the high wind watch for the Front Range foothills zones 35 and 36 has already been upgraded to a high wind warning. Warning begins at 2 pm MST this afternoon and now runs to 6 AM MST Wed. Model guidance shows gusty downslope/Chinook winds developing in the foothills over the next few hours on the nose of a strong jet diving down from Idaho. Next...the winter weather advisory for the northern mtn zones 31 and 33 will be upgraded to a winter storm warning as of 5 PM MST when this same jet is expected to funnel in a deep ribbon of moisture on strong west- northwesterly winds. The northern mtns...particularly the Park Range north of Rabbit Ears Pass and the Rabbit Ears Range will be most susceptible to this flow. The higher elevations of Summit and eastern Grand counties will also be under major influence of this moisture rich flow. Periods of heavy snow...strong winds causing drifting snow and near white out conditions in blowing snow at times reasons for the warning upgrade. Farther south in mtn zone 34 the winter weather advisory will be extended to 5 PM MST Wed. Northwest flow less conductive for heavy accumulations in this area except perhaps up around Berthoud Pass and Winter Park area where snow amounts could be similar to those in the Park Range. East of the mtns dry and breezy conditions will prevail through tonight. However by morning could see a few light rain/snow showers drift east over the adjacent plains...and west winds could become quite gusty near the base of th4e foothills. && .SHORT TERM...(Today and tonight) Issued at 356 AM MST Tue Jan 10 2017 Wly flow aloft will continue over the area today and tonight. Cross- sections still show decent moisture and favorable lapse rates thru the aftn in the mtns so will continue to see periods of snow and gusty winds over the higher passes. There could be a brief lull early this morning but it could increase again by late morning into the aftn especially along along and north of I-70. Tonight with lapse rates becoming more stable snowfall may decrease this evening although gusty winds will continue over the passes. Over nern CO it will be dry thru the aftn with highs in the mainly in the upper 40s to lower 50s across the plains. As for high wind potential not sure how tings are going to evolve later this aftn and tonight. Cross-sections do show lapse rates becoming more stable by early this evening and continuing overnight with a mtn wave developing. Component along winds are fcst in the 50-60 kt range so there is some threat for high winds in the foothills so will issue a watch. Below 6000 ft not sure if stronger winds will mix down into zns 38 and 39 so will hold off on a watch at this time. .LONG TERM...(Wednesday through Monday) Issued at 356 AM MST Tue Jan 10 2017 A 110-140 knot west-southwesterly jet maximum is over the forecast area continually Wednesday through Thursday. By Thursday night, the flow aloft becomes southwesterly but still stays in the 100-120 knot range. For much of the time, the QG Omega fields have weak upward synoptic scale energy over the forecast area all four periods. On Wednesday morning, a cold front and some upslope moves into the northeast corner but it never makes it all the westward to the foothills. All the models show that. Usually these airmasses make it across all the planes. Drainage and downsloping predominated Wednesday night. On Thursday, another cold front with easterly upslope makes through all the plains into the lower foothills by midday. The upslope lasts into the evening, then gives way to normal drainage patterns by midnight. There is a mountain wave set-up on the cross section again, Thursday morning. Winds will blow in favored areas but they should not get fierce in speed. There is decent moisture to continue over the mountains on Wednesday and by later afternoon, there may be some low level cloudiness getting into the plains with the upslope. The moisture deepens in the mountains later Wednesday night and continues Thursday and Thursday night. There is a bit of mid and upper level moisture over the plains Wednesday night. There is pretty decent moisture over the plains on the GFS Thursday and Thursday night, less on the NAM but more in the lower levels those two periods. The QPF fields have fairly decent snowfall amounts in the mountains on Wednesday into the evening. Amounts decrease later Wednesday night and continue with just a tad Thursday and Thursday night. The orographic enhancement is poor from Thursday onward with poor mountain top wind directions and speeds are down too. There is a tiny bit of measurable precipitation out over some of the plains Wednesday afternoon and again Thursday afternoon and evening. For pops in the mountains will go with 60-100%s on Wednesday, then 30-80%s Wednesday night through Thursday night. The orographic snow models points to perhaps advisory amounts of snowfall in the high mountains, at least Zone 31. This could be addressed after this morning's Winter Storm Warning expires at 18Z for the mountains. For pops on the plains will go with 0- 10%s Wednesday afternoon, then 0-25%s Thursday afternoon and night. For temperatures on Wednesday, highs will be similar to today's but up to 10 C colder over the far northeast corner. Thursday's highs are 6-9 C colder then Wednesday's. For the later days, Friday through Monday, models keep the strong southwesterly flow aloft on Friday and Friday night, then it decreases slowly Saturday and Saturday night. A weak upper trough moves across Colorado Sunday and Sunday night. The ECMWF has an upper closed circulation with this going right across eastern Colorado Sunday night. the GFS has this feature well south and southeast for the state during that time. There is weak east and northeasterly winds aloft on monday. If the ECMWF solution pans out there will be more clouds and a shot at some scattered light snow for the CWA. If the GFS is correct, it will be mostly clear. && .AVIATION...(For the 18Z TAFS through 18Z Wednesday afternoon) Issued at 1100 AM MST Tue Jan 10 2017 South-southwest winds will continue to strengthen through the early afternoon hours with gusts in the 20-25kt range as a rule. However near the foothills such as at KBJC...could see west winds gusting 30-45 kts at times by mid to late afternoon. Winds will subside some at all airports this evening...only to ramp up again after midnight with the formation of a strong high amplitude mtn wave. Could see gusts approaching 50 kts near the fthls and 35 kts farther out onto the plains late tonight. Otherwise continued dry. && .BOU WATCHES/WARNINGS/ADVISORIES... High Wind Warning from 2 PM this afternoon to 6 AM MST Wednesday for COZ035-036. Winter Weather Advisory until 5 PM MST Wednesday for COZ034. Winter Weather Advisory until 5 PM MST this afternoon for COZ031- 033. Winter Storm Warning from 5 PM this afternoon to 5 PM MST Wednesday for COZ031-033. && UPDATE...Baker SHORT TERM...RPK LONG TERM...RJK AVIATION...Baker
Hazardous weather outlook, Jan 10, 4:48 AM MST, 7 hours 5 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER/BOULDER CO 448 AM MST TUE JAN 10 2017 COZ030>051-111200- 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- 448 AM MST TUE JAN 10 2017 ...HIGH WIND WATCH FROM 2 PM THIS AFTERNOON THROUGH 5 AM WEDNESDAY MORNING FOR THE FOOTHILLS... ...WINTER WEATHER ADVISORY FOR THE CENTRAL AND NORTHERN MOUNTAINS THROUGGH THIS AFTERNOON. THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT PERIODS OF SNOW WILL CONTINUE IN THE MOUNTAINS THROUGH TONIGHT WITH ADDITIONAL ACCUMULATIONS OF 3 TO 8 INCHES. WEST WINDS OF 25 TO 40 MPH WITH GUSTS TO 60 MPH WILL PRODUCE POOR VISIBILITIES AND BLOWING SNOW OVER THE PASSES. AT LOWER ELEVATIONS STRONG WEST WINDS MAY DEVELOP BY LATE AFTERNOON AND CONTINUE TONIGHT IN THE FOOTHILLS. WINDS GUSTS TO 75 MPH WILL BE POSSIBLE. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY SNOW WILL CONTINUE TO FALL IN THE MOUNTAINS THROUGH FRIDAY...WITH THE GREATEST AMOUNTS EXPECTED ON WEDNESDAY AND WEDNESDAY EVENING. THE SNOW WILL MOSTLY STOP IN THE MOUNTAINS FOR THE WEEKEND AND EARLY NEXT WEEK. THERE WILL BE A SLIGHT CHANCE OF PRECIPITATION OVER THE PLAINS WEDNESDAY AFTERNOON...THEN A SLIGHT CHANCE OF SNOW THURSDAY AFTERNOON AND NIGHT. ACCUMULATIONS OVER THE PLAINS WILL BE NEGLIGIBLE. THERE COULD BE ANOTHER SHOT OF STRONG DOWNSLOPING WINDS OVER THE HIGH MOUNTAINS...FOOTHILLS AND IMMEDIATE PLAINS THURSDAY MORNING. .SPOTTER INFORMATION STATEMENT... REPORTS OF SNOWFALL OR STRONG WINDS WILL BE APPRECIATED.
In the hours before
Local storm report, Jan 10, 10:41 AM MST, 1 hour 12 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
1041 AM MST TUE JAN 10 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0937 AM HEAVY SNOW 1 SW ELDORA 39.94N 105.59W
01/10/2017 E7.3 INCH BOULDER CO MESONET
LAKE ELDORA SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 7 SSE CAMERON PASS 40.41N 105.82W
01/10/2017 E13.6 INCH GRAND CO MESONET
LAKE IRENE SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 9 ENE STEAMBOAT SPRINGS 40.54N 106.68W
01/10/2017 E23.1 INCH JACKSON CO MESONET
TOWER SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 1 NNW BERTHOUD PASS 39.80N 105.78W
01/10/2017 E9.5 INCH GRAND CO MESONET
BERTHOUD SUMMIT SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 5 W BERTHOUD FALLS 39.76N 105.91W
01/10/2017 E12.6 INCH GRAND CO MESONET
JONES PASS SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 1 WNW LOVELAND PASS 39.67N 105.90W
01/10/2017 E13.7 INCH CLEAR CREEK CO MESONET
LOVELAND BASIN SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 3 WNW ALMA 39.30N 106.11W
01/10/2017 E7.4 INCH PARK CO MESONET
BUCKSKIN JOE SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM SNOW 3 SW MEEKER PARK 40.21N 105.57W
01/10/2017 E4.2 INCH BOULDER CO MESONET
COPELAND LAKE SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 9 E GLENDEVEY 40.81N 105.77W
01/10/2017 E11.5 INCH LARIMER CO MESONET
DEADMAN HILL SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 1 NW CLIMAX 39.38N 106.20W
01/10/2017 E10.5 INCH SUMMIT CO MESONET
FREMONT PASS SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 5 WSW GUANELLA PASS 39.57N 105.80W
01/10/2017 E11.5 INCH CLEAR CREEK CO MESONET
JACKWHACKER GULCH SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 1 NNW CAMERON PASS 40.53N 105.89W
01/10/2017 E20.0 INCH LARIMER CO MESONET
JOE WRIGHT SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 7 E BLUE RIVER 39.44N 105.91W
01/10/2017 E8.4 INCH PARK CO MESONET
MICHIGAN CREEK SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 3 SW WARD 40.04N 105.54W
01/10/2017 E6.3 INCH BOULDER CO MESONET
NIWOT SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 8 SSE CAMERON PASS 40.40N 105.85W
01/10/2017 E9.5 INCH GRAND CO MESONET
PHANTOM VALLEY SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM SNOW 9 SE WESTON PASS 39.03N 106.08W
01/10/2017 E5.2 INCH PARK CO MESONET
ROUGH AND TUMBLE SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM SNOW 5 WSW GRAND LAKE 40.23N 105.92W
01/10/2017 E4.2 INCH GRAND CO MESONET
STILLWATER CREEK SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 6 NW SILVERTHORNE 39.72N 106.16W
01/10/2017 E9.5 INCH SUMMIT CO MESONET
SUMMIT RANCH SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 3 S BRAINARD LAKE 40.03N 105.58W
01/10/2017 E9.4 INCH BOULDER CO MESONET
UNIVERSITY CAMP SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 8 SSE RAND 40.35N 106.09W
01/10/2017 E12.6 INCH GRAND CO MESONET
WILLOW CREEK PASS SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 4 NNW LONGS PEAK 40.31N 105.64W
01/10/2017 E13.7 INCH LARIMER CO MESONET
BEAR LAKE SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 1 NNE RABBIT EARS PASS 40.39N 106.60W
01/10/2017 E16.8 INCH JACKSON CO MESONET
COLUMBINE SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 8 NW GLENDEVEY 40.88N 106.05W
01/10/2017 E11.6 INCH LARIMER CO MESONET
ROACH SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 5 SSW BLUE RIVER 39.36N 106.06W
01/10/2017 E8.4 INCH SUMMIT CO MESONET
HOOSIER PASS SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 9 SE CAMERON PASS 40.43N 105.73W
01/10/2017 E11.5 INCH LARIMER CO MESONET
WILLOW PARK SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM SNOW 1 NE ECHO LAKE 39.66N 105.59W
01/10/2017 E3.1 INCH CLEAR CREEK CO MESONET
ECHO LAKE SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 1 SSE LOVELAND PASS 39.65N 105.87W
01/10/2017 E15.8 INCH SUMMIT CO MESONET
GRIZZLY PEAK SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 10 NNE SILVERTHORNE 39.80N 106.03W
01/10/2017 E8.4 INCH GRAND CO MESONET
MIDDLE FORK CAMP SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 1 W COPPER MOUNTAIN 39.49N 106.17W
01/10/2017 E12.6 INCH SUMMIT CO MESONET
COPPER MOUNTAIN SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 4 SE MOUNT ZIRKEL 40.79N 106.60W
01/10/2017 E21.0 INCH JACKSON CO MESONET
ZIRKEL SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 5 SSW GLENDEVEY 40.71N 106.01W
01/10/2017 E9.5 INCH JACKSON CO MESONET
RAWAH SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 9 SSE SPICER 40.35N 106.38W
01/10/2017 E11.6 INCH GRAND CO MESONET
ARAPAHO RIDGE SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 4 S LONGS PEAK 40.20N 105.60W
01/10/2017 E10.5 INCH BOULDER CO MESONET
WILD BASIN SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 3 WNW PINGREE PARK 40.58N 105.63W
01/10/2017 E8.4 INCH LARIMER CO MESONET
HOURGLASS LAKE SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 5 W GREEN MOUNTAIN RESE 39.86N 106.42W
01/10/2017 E11.6 INCH SUMMIT CO MESONET
ELLIOT RIDGE SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 6 E CAMERON PASS 40.51N 105.77W
01/10/2017 E13.6 INCH LARIMER CO MESONET
LONG DRAW RESERVOIR SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM SNOW 7 NW RED FEATHER LAKES 40.89N 105.66W
01/10/2017 E4.2 INCH LARIMER CO MESONET
BLACK MOUNTAIN SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 6 W ARAPAHOE PEAK 40.04N 105.75W
01/10/2017 E6.3 INCH GRAND CO MESONET
HIGH LONESOME SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
0937 AM HEAVY SNOW 3 NNE MOUNT AUDUBON 40.14N 105.59W
01/10/2017 E9.5 INCH BOULDER CO MESONET
SAWTOOTH SNOTEL
SNOWFALL BETWEEN 8 AM 01/09/2017 AND 8 AM 01/10/2017
ESTIMATED USING A 10.5 TO 1 SNOW-TO-LIQUID RATIO
&&The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 10, 1:13 AM MST | High Wind Warning | BOU | Larimer, Weld | 9 min |
| Jan 10, 1:22 AM MST | High Wind Warning | BOU | Larimer, Weld | 3 hr |
| Jan 10, 4:29 AM MST | High Wind Watch | BOU | Boulder, Clear Creek, Douglas, Gilpin, Jefferson, Larimer and 1 more | 5 hr |
| Jan 10, 4:53 AM MST | Winter Weather Advisory | BOU | Boulder, Clear Creek, Gilpin, Grand, Jackson, Jefferson and 3 more | 19 hr |
| Jan 10, 9:38 AM MST | High Wind Warning | BOU | Boulder, Clear Creek, Douglas, Gilpin, Jefferson, Larimer and 1 more | 19 hr |
Nearby
Winter Storm Warnings in Colorado, 2017Every winter storm warning in 2017
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.