Alert archive / Colorado / Winter Storm Warnings in 2012
Winter Storm Warning 8, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this winter storm warning at Dec 8, 2012, 2:44 PM MST for 9 counties in Colorado. It was in force for 11 hr. 6 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
- Dec 8, 2012, 2:44 PM MST (21:44 UTC)
- Expired
- Dec 9, 2012, 1:36 AM MST
- In force
- 11 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 21:49 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 |
|---|---|---|---|
| Dec 8, 4:00 PM MST | SNOW 3.5 | 1 Nnw Grand Lake, CO | |
| Dec 8, 4:10 PM MST | SNOW 3.9 | 3 W Jamestown, CO | ONE INCH PAST HOUR |
| Dec 8, 5:07 PM MST | HEAVY SNOW 12 | 2 Sse Tabernash, CO | TWO INCHES OF SNOW SINCE 3 PM |
| Dec 8, 8:00 PM MST | SNOW 2.9 | 2 Sse Breckenridge, CO | |
| Dec 8, 10:00 PM MST | SNOW 1.6 | N Ken Caryl, CO | |
| Dec 8, 10:25 PM MST | SNOW 0.5 | 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 (KDNR), launched 12:00Z, 9.7 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
- 1398 m above ground
- 0-6 km bulk shear
- 70 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 296 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
739 WWUS45 KBOU 082144 WSWBOU URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER CO 244 PM MST SAT DEC 8 2012 ...STRONG WINDS AND SNOW FOR THE MOUNTAINS TODAY AND TONIGHT... .STRONG WEST TO NORTHWEST WINDS AND PERIODS OF HEAVY SNOW WILL PRODUCE HAZARDOUS WINTER WEATHER CONDITIONS FOR TRAVELER... SKIERS AND ANYONE ELSE OUTDOORS IN THE NORTH CENTRAL MOUNTAINS OF COLORADO THROUGH LATE TONIGHT. SNOWFALL WILL LIKELY INCREASE IN INTENSITY ABOVE TIMBERLINE AND ON WEST AND NORTHWEST FACING MOUNTAIN SLOPES THIS AFTERNOON WITH A POWERFUL JET STREAM PASSING OVER THE AREA. CONDITIONS SHOULD GRADUALLY IMPROVE LATE TONIGHT WITH A STEADY REDUCTION IN THE WIND AND SNOWFALL. COZ031-033-034-090545- /O.UPG.KBOU.WW.Y.0018.000000T0000Z-121209T1200Z/ /O.NEW.KBOU.WS.W.0008.121208T2144Z-121209T0900Z/ 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...WINTER PARK 244 PM MST SAT DEC 8 2012 ...WINTER STORM WARNING IN EFFECT UNTIL 2 AM MST SUNDAY... THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A WINTER STORM WARNING FOR THE NORTH CENTRAL MOUNTAINS OF COLORADO...WHICH IS IN EFFECT UNTIL 2 AM MST SUNDAY. THE WINTER WEATHER ADVISORY IS NO LONGER IN EFFECT FOR THIS AREA. * TIMING...SNOW WILL INCREASE THIS LATE THIS AFTERNOON AND CONTINUE HEAVY AT TIMES THROUGH THIS EVENING. CONDITIONS WILL IMPROVE LATE TONIGHT. * SNOW ACCUMULATIONS...ANOTHER 5 TO 12 INCHES...WITH THE HIGHER AMOUNTS ON WEST AND NORTHWEST FACING SLOPES IN JACKSON...GRAND AND SUMMIT COUNTIES. * MAIN IMPACT...WEST WINDS OF 40 TO 60 MPH WILL LIKELY PRODUCE CONSIDERABLE BLOWING AND DRIFTING SNOW IN OPEN AREAS ABOVE 10 THOUSAND FEET. HIGHER GUSTS ABOVE TIMBERLINE WILL PRODUCE DANGEROUS WHITEOUT CONDITIONS AND WIND CHILLS AS LOW AS 25 DEGREES BELOW ZERO. THE STRONG WINDS AND REDUCED VISIBILITIES DUE TO BLOWING SNOW WILL CREATE HAZARDOUS DRIVING CONDITIONS... PARTICULARLY ON THE HIGH MOUNTAIN PASSES. * OTHER IMPACTS...TIRE CHAINS AND OR ADEQUATE SNOW TIRES WILL LIKELY BE REQUIRED ON MANY HIGH MOUNTAIN ROADS. 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. && $$ BAKER
2 follow-up statements
020 WWUS45 KBOU 090325 WSWBOU URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER CO 825 PM MST SAT DEC 8 2012 ...WINDY AND SNOWY CONDITIONS IN THE MOUNTAINS TONIGHT... .CONTINUING WEST TO NORTHWEST WINDS AND PERIODS OF HEAVY SNOW WILL PRODUCE HAZARDOUS WINTER WEATHER CONDITIONS FOR TRAVELERS IN THE NORTH CENTRAL MOUNTAINS OF COLORADO TONIGHT. SNOWFALL...HEAVY AT TIMES...IS EXPECTED TO CONTINUE OVER THE I-70 CORRIDOR THROUGH ABOUT MIDNIGHT. CONDITIONS SHOULD GRADUALLY IMPROVE DURING THE PRE-DAWN HOURS WITH A STEADY REDUCTION IN THE WIND AND SNOWFALL. COZ031-033-034-090900- /O.CON.KBOU.WS.W.0008.000000T0000Z-121209T0900Z/ 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...WINTER PARK 825 PM MST SAT DEC 8 2012 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 2 AM MST SUNDAY... * TIMING...SNOW WILL BE HEAVY AT TIMES THROUGH MIDNIGHT. CONDITIONS WILL IMPROVE AFTER MIDNIGHT. * SNOW ACCUMULATIONS...ANOTHER 4 TO 8 INCHES OVERNIGHT...WITH THE HIGHER AMOUNTS ON WEST AND NORTHWEST FACING SLOPES IN GRAND AND SUMMIT COUNTIES. * MAIN IMPACT...WEST WINDS OF 40 TO 50 MPH WILL LIKELY PRODUCE CONSIDERABLE BLOWING AND DRIFTING SNOW IN OPEN AREAS ABOVE 10 THOUSAND FEET. HIGHER GUSTS ABOVE TIMBERLINE WILL PRODUCE DANGEROUS WHITEOUT CONDITIONS AND WIND CHILLS AS LOW AS 25 DEGREES BELOW ZERO. THE STRONG WINDS AND REDUCED VISIBILITIES DUE TO BLOWING SNOW WILL CREATE HAZARDOUS DRIVING CONDITIONS... PARTICULARLY ON THE HIGH MOUNTAIN PASSES. * OTHER IMPACTS...TIRE CHAINS AND/OR ADEQUATE SNOW TIRES WILL LIKELY BE REQUIRED ON MANY HIGH MOUNTAIN ROADS. 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. && $$ COZ037-090900- /O.NEW.KBOU.WW.Y.0019.121209T0325Z-121209T0900Z/ CENTRAL AND SOUTHEAST PARK COUNTY- INCLUDING THE CITIES OF...FAIRPLAY...HARTSEL...LAKE GEORGE... SOUTH PARK 825 PM MST SAT DEC 8 2012 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 2 AM MST SUNDAY... THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A WINTER WEATHER ADVISORY FOR SNOW AND BLOWING SNOW...WHICH IS IN EFFECT UNTIL 2 AM MST SUNDAY. * TIMING...SNOW...HEAVY AT TIMES...IS EXPECTED TO SPREAD ACROSS PARK COUNTY THROUGH THIS EVENING AND CONTINUE THROUGH ABOUT 2 AM. * SNOW ACCUMULATIONS...3 TO 6 INCHES OVERNIGHT...WITH QUITE A BIT OF DRIFTING. * MAIN IMPACT...WEST TO NORTHWEST WINDS AT 40 TO 50 MPH WILL CAUSE WIDESPREAD BLOWING AND DRIFTING SNOW. VISIBILITIES WILL BE POOR FOR MOTORISTS ALONG HIGHWAY 285. * OTHER IMPACTS...WIND CHILL VALUES COULD DROP AS LOW AS 25 DEGREES BELOW ZERO. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW AND BLOWING SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$
466 WWUS45 KBOU 090836 WSWBOU URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER CO 136 AM MST SUN DEC 9 2012 ...SNOW SHIFTING TO THE CENTRAL COLORADO MOUNTAINS... .SNOW WAS DIMINISHING IN THE NORTHERN COLORADO MOUNTAINS EARLY THIS MORNING...BUT AN AREA OF MODERATE TO HEAVY SNOW CONTINUED ACROSS THE CENTRAL MOUNTAINS FROM THE ASPEN AREA EAST TO PARK COUNTY. SNOWFALL WILL GRADUALLY DIMINISH ACROSS SUMMIT COUNTY DURING THE EARLY MORNING HOURS...BUT WILL CONTINUE IN PARK COUNTY UNTIL LATER THIS MORNING. WINDS WILL ALSO GRADUALLY DIMINISH...BUT THERE WILL STILL BE AREAS OF BLOWING AND DRIFTING SNOW AT LEAST THROUGH SUNRISE. COZ034-091600- /O.CAN.KBOU.WS.W.0008.000000T0000Z-121209T0900Z/ /O.EXB.KBOU.WW.Y.0019.000000T0000Z-121209T1600Z/ 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...WINTER PARK 136 AM MST SUN DEC 9 2012 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 9 AM MST THIS MORNING... ...WINTER STORM WARNING IS CANCELLED... THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A WINTER WEATHER ADVISORY FOR SNOW AND BLOWING SNOW...WHICH IS IN EFFECT UNTIL 9 AM MST THIS MORNING. THE WINTER STORM WARNING HAS BEEN CANCELLED. * TIMING...SNOW AND WINDS WILL GRADUALLY DIMINISH THIS MORNING. * SNOW ACCUMULATIONS...ANOTHER 3 TO 6 INCHES BY LATE THIS MORNING. * MAIN IMPACT...WEST TO NORTHWEST WINDS AT 20 TO 30 MPH WITH GUSTS TO 50 MPH WILL CAUSE BLOWING AND DRIFTING SNOW IN EXPOSED AREAS. * OTHER IMPACTS...WIND CHILL VALUES COULD DROP AS LOW AS 25 DEGREES BELOW ZERO. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW AND BLOWING SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ COZ031-033-090945- /O.CAN.KBOU.WS.W.0008.000000T0000Z-121209T0900Z/ 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...WILLOW CREEK PASS 136 AM MST SUN DEC 9 2012 ...WINTER STORM WARNING IS CANCELLED... SNOW WILL CONTINUE TO DIMINISH THIS MORNING. ADDITIONAL ACCUMULATIONS OF 2 TO 4 INCHES ARE EXPECTED THROUGH LATE THIS MORNING. $$ COZ037-091600- /O.EXT.KBOU.WW.Y.0019.000000T0000Z-121209T1600Z/ CENTRAL AND SOUTHEAST PARK COUNTY- INCLUDING THE CITIES OF...FAIRPLAY...HARTSEL...LAKE GEORGE... SOUTH PARK 136 AM MST SUN DEC 9 2012 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 9 AM MST THIS MORNING... * TIMING...SNOW WILL CONTINUE THIS MORNING AND MAY BE HEAVY AT TIMES. * SNOW ACCUMULATIONS...STORM TOTALS OF 3 TO 6 INCHES BY LATE THIS MORNING. * MAIN IMPACT...WEST TO NORTHWEST WINDS AT 15 TO 30 MPH WITH GUSTS TO 40 MPH WILL CAUSE WIDESPREAD BLOWING AND DRIFTING SNOW. VISIBILITIES WILL BE POOR FOR MOTORISTS ALONG HIGHWAY 285. * OTHER IMPACTS...WIND CHILL VALUES COULD DROP AS LOW AS 25 DEGREES BELOW ZERO. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW AND BLOWING SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ GIMMESTAD
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 7, 9:25 PM MST | Winter Weather Advisory | BOU | Boulder, Clear Creek, Gilpin, Grand, Jackson, Jefferson and 3 more | 17 hr |
Nearby
Winter Storm Warnings in Colorado, 2012Every winter storm warning in 2012
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.