Alert archive / Colorado / Winter Weather Advisories in 2012
Winter Weather Advisory 21, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this winter weather advisory at Dec 16, 2012, 2:47 PM MST for 9 counties in Colorado. It was in force for 38 hr.
The area
The counties it named.
The facts
- Issued
- Dec 16, 2012, 2:47 PM MST (21:47 UTC)
- Expired
- Dec 18, 2012, 5:00 AM MST
- In force
- 38 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 21:44 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.
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 9.8 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
- 1007 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
788 WWUS45 KBOU 162147 WSWBOU URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER CO 247 PM MST SUN DEC 16 2012 ...PROLONGED SNOW AND BLOWING SNOW EVENT FOR THE NORTHERN MOUNTAINS OF COLORADO... .A STRONG UPPER LEVEL JET STREAM RACING OFF THE PACIFIC WILL BRING STRONG WINDS AND SEVERAL WAVES OF PACIFIC MOISTURE INTO NORTHERN COLORADO. WHILE SNOW WILL OCCUR TONIGHT AND MONDAY MORNING...THE HEAVIEST SNOWFALL IS EXPECTED TO DEVELOP MONDAY AFTERNOON AND MONDAY NIGHT. THE HEAVIEST SNOW WILL OCCUR IN THE PARK...GORE... AND SIERRA MADRE RANGES...INCLUDING RABBIT EARS PASS AND THE MOUNT ZIRKEL WILDERNESS AREAS. STRONG WINDS WILL PRODUCE CONSIDERABLE BLOWING AND DRIFTING SNOW AND POOR VISIBILITIES. WINTER DRIVING CONDITIONS WILL OCCUR ACROSS ALL OF THE HIGH MOUNTAIN PASSES ALONG AND NORTH OF THE I-70 CORRIDOR. COZ031-170700- /O.UPG.KBOU.WW.Y.0020.000000T0000Z-121217T1200Z/ /O.NEW.KBOU.WS.W.0009.121216T2147Z-121218T1200Z/ WEST JACKSON AND WEST GRAND COUNTIES ABOVE 9000 FEET- INCLUDING THE CITIES OF... EAST SLOPES PARK AND NORTHERN GORE RANGES...GORE PASS... RABBIT EARS PASS 247 PM MST SUN DEC 16 2012 ...WINTER STORM WARNING IN EFFECT UNTIL 5 AM MST TUESDAY... THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A WINTER STORM WARNING FOR SNOW AND BLOWING SNOW...WHICH IS IN EFFECT UNTIL 5 AM MST TUESDAY. THE WINTER WEATHER ADVISORY IS NO LONGER IN EFFECT. * TIMING...SNOW WILL BE HEAVY AT TIMES THROUGH THIS EVENING AND THEN DECREASE A LITTLE LATE TONIGHT INTO MONDAY MORNING. HOWEVER...ANOTHER PERIOD OF HEAVIER SNOWFALL WILL LIKELY DEVELOP MONDAY AFTERNOON AND CONTINUE THROUGH MONDAY NIGHT. STRONG WINDS WILL OCCUR DURING THIS ENTIRE PERIOD WITH CONSIDERABLE BLOWING AND DRIFTING SNOW. * SNOW ACCUMULATIONS...14 TO 26 INCHES BY EARLY TUESDAY MORNING. ADDITIONAL ACCUMULATING SNOWFALL IS EXPECTED TUESDAY INTO WEDNESDAY. * WIND...WEST WINDS 20 TO 30 MPH WITH GUSTS UP TO 45 MPH OVER EXPOSED RIDGES. * MAIN IMPACT...STRONG WINDS AND PERIODS OF HEAVY SNOW WILL PRODUCE HARSH WINTER CONDITIONS AND DANGEROUS TRAVEL. MANY SECONDARY ROADS WILL BECOME IMPASSABLE DUE TO HEAVY SNOW ACCUMULATION AND SIGNIFICANT DRIFTING SNOW. VISIBILITIES MAY BE REDUCED TO ZERO AT TIMES. 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. && $$ COZ033-170700- /O.NEW.KBOU.WW.Y.0021.121216T2147Z-121218T1200Z/ SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/ NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET- INCLUDING THE CITIES OF...CAMERON PASS... LARAMIE AND MEDICINE BOW MOUNTAINS...RABBIT EARS RANGE... ROCKY MOUNTAIN NATIONAL PARK...WILLOW CREEK PASS 247 PM MST SUN DEC 16 2012 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 5 AM MST TUESDAY... THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A WINTER WEATHER ADVISORY FOR SNOW AND BLOWING SNOW...WHICH IS IN EFFECT UNTIL 5 AM MST TUESDAY. * TIMING...SNOW WILL CONTINUE FROM TONIGHT THROUGH MONDAY NIGHT. THE HEAVIEST SNOW IS EXPECTED TO FALL FROM LATE MONDAY AFTERNOON INTO MONDAY NIGHT. * SNOW ACCUMULATIONS...8 TO 15 INCHES BY EARLY TUESDAY MORNING. ADDITIONAL ACCUMULATING SNOWFALL IS EXPECTED TUESDAY INTO WEDNESDAY. * WIND...WEST WINDS 20 TO 35 MPH WITH GUSTS IN EXCESS OF 60 MPH ABOVE TIMBERLINE. * MAIN IMPACT...SNOW AND CONSIDERABLE BLOWING SNOW WILL CREATE HAZARDOUS DRIVING CONDITIONS. WHITEOUT CONDITIONS CAN BE EXPECTED AT TIMES OVER THE HIGHER MOUNTAINS AND PASSES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ BARJENBRUCH
6 follow-up statements
489 WWUS45 KBOU 170401 WSWBOU URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER CO 901 PM MST SUN DEC 16 2012 ...PROLONGED SNOW AND BLOWING SNOW EVENT FOR THE NORTHERN MOUNTAINS OF COLORADO... .A STRONG UPPER LEVEL JET STREAM RACING OFF THE PACIFIC WILL BRING STRONG WINDS AND SEVERAL WAVES OF PACIFIC MOISTURE INTO NORTHERN COLORADO. WHILE SNOW WILL OCCUR TONIGHT AND MONDAY MORNING...THE HEAVIEST SNOWFALL IS EXPECTED TO DEVELOP MONDAY AFTERNOON AND MONDAY NIGHT. THE HEAVIEST SNOW WILL OCCUR IN THE PARK...GORE... AND SIERRA MADRE RANGES...INCLUDING RABBIT EARS PASS AND THE MOUNT ZIRKEL WILDERNESS AREAS. STRONG WINDS WILL PRODUCE CONSIDERABLE BLOWING AND DRIFTING SNOW AND POOR VISIBILITIES. WINTER DRIVING CONDITIONS WILL OCCUR ACROSS ALL OF THE HIGH MOUNTAIN PASSES ALONG AND NORTH OF THE I-70 CORRIDOR. COZ031-171215- /O.CON.KBOU.WS.W.0009.000000T0000Z-121218T1200Z/ WEST JACKSON AND WEST GRAND COUNTIES ABOVE 9000 FEET- INCLUDING THE CITIES OF... EAST SLOPES PARK AND NORTHERN GORE RANGES...GORE PASS... RABBIT EARS PASS 901 PM MST SUN DEC 16 2012 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST TUESDAY... * TIMING...SNOW WILL BE HEAVY AT TIMES THROUGH THIS EVENING AND THEN DECREASE A LITTLE LATE TONIGHT INTO MONDAY MORNING. HOWEVER...ANOTHER PERIOD OF HEAVIER SNOWFALL WILL LIKELY DEVELOP MONDAY AFTERNOON AND CONTINUE THROUGH MONDAY NIGHT. STRONG WINDS WILL OCCUR DURING THIS ENTIRE PERIOD WITH CONSIDERABLE BLOWING AND DRIFTING SNOW. * SNOW ACCUMULATIONS...14 TO 26 INCHES BY EARLY TUESDAY MORNING. ADDITIONAL ACCUMULATING SNOWFALL IS EXPECTED TUESDAY INTO WEDNESDAY. * WIND...WEST WINDS 20 TO 30 MPH WITH GUSTS UP TO 45 MPH OVER EXPOSED RIDGES. * MAIN IMPACT...STRONG WINDS AND PERIODS OF HEAVY SNOW WILL PRODUCE HARSH WINTER CONDITIONS AND DANGEROUS TRAVEL. MANY SECONDARY ROADS WILL BECOME IMPASSABLE DUE TO HEAVY SNOW ACCUMULATION AND SIGNIFICANT DRIFTING SNOW. VISIBILITIES MAY BE REDUCED TO ZERO AT TIMES. 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. && $$ COZ033-171215- /O.CON.KBOU.WW.Y.0021.000000T0000Z-121218T1200Z/ SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/ NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET- INCLUDING THE CITIES OF...CAMERON PASS... LARAMIE AND MEDICINE BOW MOUNTAINS...RABBIT EARS RANGE... ROCKY MOUNTAIN NATIONAL PARK...WILLOW CREEK PASS 901 PM MST SUN DEC 16 2012 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST TUESDAY... * TIMING...SNOW WILL CONTINUE FROM TONIGHT THROUGH MONDAY NIGHT. THE HEAVIEST SNOW IS EXPECTED TO FALL FROM LATE MONDAY AFTERNOON INTO MONDAY NIGHT. * SNOW ACCUMULATIONS...8 TO 15 INCHES BY EARLY TUESDAY MORNING. ADDITIONAL ACCUMULATING SNOWFALL IS EXPECTED TUESDAY INTO WEDNESDAY. * WIND...WEST WINDS 20 TO 35 MPH WITH GUSTS IN EXCESS OF 60 MPH ABOVE TIMBERLINE. * MAIN IMPACT...SNOW AND CONSIDERABLE BLOWING SNOW WILL CREATE HAZARDOUS DRIVING CONDITIONS. WHITEOUT CONDITIONS CAN BE EXPECTED AT TIMES OVER THE HIGHER MOUNTAINS AND PASSES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$
069 WWUS45 KBOU 171238 WSWBOU URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER/BOULDER CO 538 AM MST MON DEC 17 2012 ...PROLONGED SNOW AND BLOWING SNOW EVENT FOR THE NORTHERN MOUNTAINS OF COLORADO... .A STRONG UPPER LEVEL JET STREAM RACING OFF THE PACIFIC WILL BRING STRONG WINDS AND SEVERAL WAVES OF PACIFIC MOISTURE INTO NORTHERN COLORADO. THE HEAVIEST SNOWFALL IS EXPECTED TO DEVELOP THIS AFTERNOON AND TONIGHT. THE HEAVIEST SNOW WILL OCCUR IN THE PARK...GORE... AND SIERRA MADRE RANGES...INCLUDING RABBIT EARS PASS AND THE MOUNT ZIRKEL WILDERNESS AREAS. STRONG WINDS WILL PRODUCE CONSIDERABLE BLOWING AND DRIFTING SNOW AND POOR VISIBILITIES. WINTER DRIVING CONDITIONS WILL OCCUR ACROSS ALL OF THE HIGH MOUNTAIN PASSES ALONG AND NORTH OF THE I-70 CORRIDOR. COZ031-172045- /O.CON.KBOU.WS.W.0009.000000T0000Z-121218T1200Z/ WEST JACKSON AND WEST GRAND COUNTIES ABOVE 9000 FEET- INCLUDING THE CITIES OF... EAST SLOPES PARK AND NORTHERN GORE RANGES...GORE PASS... RABBIT EARS PASS 538 AM MST MON DEC 17 2012 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST TUESDAY... * TIMING...SNOW WILL BE HEAVY AT TIMES LATER THIS AFTERNOON AND CONTINUE THROUGH TONIGHT. STRONG WINDS WILL OCCUR DURING THIS ENTIRE PERIOD WITH CONSIDERABLE BLOWING AND DRIFTING SNOW. * SNOW ACCUMULATIONS...10 TO 16 INCHES BY EARLY TUESDAY MORNING. ADDITIONAL ACCUMULATING SNOWFALL IS EXPECTED TUESDAY INTO WEDNESDAY. * WIND...WEST WINDS 20 TO 30 MPH WITH GUSTS UP TO 45 MPH OVER EXPOSED RIDGES. * MAIN IMPACT...STRONG WINDS AND PERIODS OF HEAVY SNOW WILL PRODUCE HARSH WINTER CONDITIONS AND DANGEROUS TRAVEL. MANY SECONDARY ROADS WILL BECOME IMPASSABLE DUE TO HEAVY SNOW ACCUMULATION AND SIGNIFICANT DRIFTING SNOW. VISIBILITIES MAY BE REDUCED TO ZERO AT TIMES. 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. && $$ COZ033-172045- /O.CON.KBOU.WW.Y.0021.000000T0000Z-121218T1200Z/ SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/ NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET- INCLUDING THE CITIES OF...CAMERON PASS... LARAMIE AND MEDICINE BOW MOUNTAINS...RABBIT EARS RANGE... ROCKY MOUNTAIN NATIONAL PARK...WILLOW CREEK PASS 538 AM MST MON DEC 17 2012 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST TUESDAY... * TIMING...SNOW WILL CONTINUE THROUGH TONIGHT. THE HEAVIEST SNOW IS EXPECTED TO FALL FROM LATE MONDAY AFTERNOON INTO TONIGHT. * SNOW ACCUMULATIONS...8 TO 15 INCHES BY EARLY TUESDAY MORNING. ADDITIONAL ACCUMULATING SNOWFALL IS EXPECTED TUESDAY INTO WEDNESDAY. * WIND...WEST WINDS 20 TO 35 MPH WITH GUSTS IN EXCESS OF 60 MPH ABOVE TIMBERLINE. * MAIN IMPACT...SNOW AND CONSIDERABLE BLOWING SNOW WILL CREATE HAZARDOUS DRIVING CONDITIONS. WHITEOUT CONDITIONS CAN BE EXPECTED AT TIMES OVER THE HIGHER MOUNTAINS AND PASSES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$
055 WWUS45 KBOU 172121 WSWBOU URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER/BOULDER CO 221 PM MST MON DEC 17 2012 ...SNOW AND BLOWING SNOW TO CONTINUE FOR THE NORTHERN MOUNTAINS OF COLORADO... .A STRONG UPPER LEVEL JET STREAM RACING OFF THE PACIFIC WILL CONTINUE TO BRING STRONG WINDS AND SEVERAL WAVES OF PACIFIC MOISTURE INTO NORTHERN COLORADO. SNOW WILL CONTINUE OVER THE MOUNTAINS THROUGH TONIGHT...WITH THE HEAVIEST SNOW IN THE PARK...GORE... AND SIERRA MADRE RANGES...INCLUDING RABBIT EARS PASS AND THE MOUNT ZIRKEL WILDERNESS AREAS. STRONG WINDS WILL PRODUCE CONSIDERABLE BLOWING AND DRIFTING SNOW AND POOR VISIBILITIES. WINTER DRIVING CONDITIONS WILL OCCUR ACROSS ALL OF THE HIGH MOUNTAIN PASSES ALONG AND NORTH OF THE I-70 CORRIDOR. COZ031-180530- /O.CON.KBOU.WS.W.0009.000000T0000Z-121218T1200Z/ WEST JACKSON AND WEST GRAND COUNTIES ABOVE 9000 FEET- INCLUDING THE CITIES OF... EAST SLOPES PARK AND NORTHERN GORE RANGES...GORE PASS... RABBIT EARS PASS 221 PM MST MON DEC 17 2012 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST TUESDAY... * TIMING...SNOW AND STRONG WIND WILL CONTINUE THROUGH TONIGHT. THE SNOW WILL BE HEAVY AT TIMES. THE STRONG WINDS WILL CREATE CONSIDERABLE BLOWING AND DRIFTING SNOW. * SNOW ACCUMULATIONS...10 TO 16 INCHES BY EARLY TUESDAY MORNING. ADDITIONAL ACCUMULATING SNOWFALL IS EXPECTED TUESDAY INTO WEDNESDAY. * WIND...WEST WINDS 20 TO 30 MPH WITH GUSTS UP TO 45 MPH OVER EXPOSED RIDGES. * MAIN IMPACT...STRONG WINDS AND PERIODS OF HEAVY SNOW WILL PRODUCE HARSH WINTER CONDITIONS AND DANGEROUS TRAVEL. MANY SECONDARY ROADS WILL BECOME IMPASSABLE DUE TO HEAVY SNOW ACCUMULATION AND SIGNIFICANT DRIFTING SNOW. VISIBILITIES MAY BE REDUCED TO ZERO AT TIMES. 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. && $$ COZ033-180530- /O.CON.KBOU.WW.Y.0021.000000T0000Z-121218T1200Z/ SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/ NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET- INCLUDING THE CITIES OF...CAMERON PASS... LARAMIE AND MEDICINE BOW MOUNTAINS...RABBIT EARS RANGE... ROCKY MOUNTAIN NATIONAL PARK...WILLOW CREEK PASS 221 PM MST MON DEC 17 2012 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST TUESDAY... * TIMING...SNOW WILL CONTINUE THROUGH TONIGHT AND WILL BE HEAVY AT TIMES. * SNOW ACCUMULATIONS...8 TO 15 INCHES BY EARLY TUESDAY MORNING. ADDITIONAL ACCUMULATING SNOWFALL IS EXPECTED TUESDAY INTO WEDNESDAY. * WIND...WEST WINDS 20 TO 35 MPH WITH GUSTS IN EXCESS OF 60 MPH ABOVE TIMBERLINE. * MAIN IMPACT...SNOW AND CONSIDERABLE BLOWING SNOW WILL CREATE HAZARDOUS DRIVING CONDITIONS. WHITEOUT CONDITIONS CAN BE EXPECTED AT TIMES OVER THE HIGHER MOUNTAINS AND PASSES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$
953 WWUS45 KBOU 172236 WSWBOU URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER CO 336 PM MST MON DEC 17 2012 ...SNOW AND BLOWING SNOW TO CONTINUE FOR THE NORTHERN MOUNTAINS OF COLORADO... .A STRONG UPPER LEVEL JET STREAM RACING OFF THE PACIFIC WILL CONTINUE TO BRING STRONG WINDS AND SEVERAL WAVES OF PACIFIC MOISTURE INTO NORTHERN COLORADO. SNOW WILL CONTINUE OVER THE MOUNTAINS THROUGH TONIGHT...WITH THE HEAVIEST SNOW IN THE PARK... GORE... AND SIERRA MADRE RANGES...INCLUDING RABBIT EARS PASS AND THE MOUNT ZIRKEL WILDERNESS AREAS. STRONG WINDS WILL PRODUCE CONSIDERABLE BLOWING AND DRIFTING SNOW AND POOR VISIBILITIES. WINTER DRIVING CONDITIONS WILL OCCUR ACROSS ALL OF THE HIGH MOUNTAIN PASSES ALONG AND NORTH OF THE I-70 CORRIDOR. SNOW IS EXPECTED TO DEVELOP ACROSS THE URBAN CORRIDOR AND NORTHEAST PLAINS LATE TUESDAY NIGHT INTO WEDNESDAY. THE COMBINATION OF SNOW AND BLOWING SNOW WILL PRODUCE THE POTENTIAL FOR WINTER DRIVING CONDITIONS ALONG INTERSTATES 70 AND 76 AS WELL. COZ031-180645- /O.CON.KBOU.WS.W.0009.000000T0000Z-121218T1200Z/ WEST JACKSON AND WEST GRAND COUNTIES ABOVE 9000 FEET- INCLUDING THE CITIES OF... EAST SLOPES PARK AND NORTHERN GORE RANGES...GORE PASS... RABBIT EARS PASS 336 PM MST MON DEC 17 2012 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST TUESDAY... * TIMING...SNOW AND STRONG WIND WILL CONTINUE THROUGH TONIGHT. THE SNOW WILL BE HEAVY AT TIMES. THE STRONG WINDS WILL CREATE CONSIDERABLE BLOWING AND DRIFTING SNOW. * SNOW ACCUMULATIONS...10 TO 16 INCHES BY EARLY TUESDAY MORNING. ADDITIONAL ACCUMULATING SNOWFALL IS EXPECTED TUESDAY INTO WEDNESDAY. * WIND...WEST WINDS 20 TO 30 MPH WITH GUSTS UP TO 45 MPH OVER EXPOSED RIDGES. * MAIN IMPACT...STRONG WINDS AND PERIODS OF HEAVY SNOW WILL PRODUCE HARSH WINTER CONDITIONS AND DANGEROUS TRAVEL. MANY SECONDARY ROADS WILL BECOME IMPASSABLE DUE TO HEAVY SNOW ACCUMULATION AND SIGNIFICANT DRIFTING SNOW. VISIBILITIES MAY BE REDUCED TO ZERO AT TIMES. 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. && $$ COZ034-180645- /O.EXB.KBOU.WW.Y.0021.121218T0000Z-121218T1200Z/ SOUTH AND SOUTHEAST GRAND/WEST CENTRAL AND SOUTHWEST BOULDER/ GILPIN/CLEAR CREEK/SUMMIT/NORTH AND WEST PARK COUNTIES ABOVE 9000 FEET- INCLUDING THE CITIES OF...BERTHOUD PASS...BRECKENRIDGE... EAST SLOPES MOSQUITO RANGE...EAST SLOPES SOUTHERN GORE RANGE... EISENHOWER TUNNEL...INDIAN PEAKS...KENOSHA MOUNTAINS... MOUNT EVANS...WILLIAMS FORK MOUNTAINS...WINTER PARK 336 PM MST MON DEC 17 2012 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 5 AM MST TUESDAY... THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A WINTER WEATHER ADVISORY FOR SNOW AND BLOWING SNOW WHICH IS IN EFFECT UNTIL 5 AM MST TUESDAY. * TIMING...SNOW WILL CONTINUE THROUGH TONIGHT AND WILL BE HEAVY AT TIMES. * SNOW ACCUMULATIONS...4 TO 8 INCHES BY EARLY TUESDAY MORNING. ADDITIONAL ACCUMULATING SNOWFALL IS EXPECTED TUESDAY INTO WEDNESDAY. * WIND...WEST WINDS 20 TO 30 MPH WITH GUSTS IN EXCESS OF 50 MPH ABOVE TIMBERLINE. * MAIN IMPACT...SNOW AND CONSIDERABLE BLOWING SNOW WILL CREATE HAZARDOUS DRIVING CONDITIONS. WHITEOUT CONDITIONS CAN BE EXPECTED AT TIMES OVER THE HIGHER MOUNTAINS AND PASSES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ COZ033-180645- /O.CON.KBOU.WW.Y.0021.000000T0000Z-121218T1200Z/ SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/ NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET- INCLUDING THE CITIES OF...CAMERON PASS... LARAMIE AND MEDICINE BOW MOUNTAINS...RABBIT EARS RANGE... ROCKY MOUNTAIN NATIONAL PARK...WILLOW CREEK PASS 336 PM MST MON DEC 17 2012 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST TUESDAY... * TIMING...SNOW WILL CONTINUE THROUGH TONIGHT AND WILL BE HEAVY AT TIMES. * SNOW ACCUMULATIONS...5 TO 10 INCHES BY EARLY TUESDAY MORNING. ADDITIONAL ACCUMULATING SNOWFALL IS EXPECTED TUESDAY INTO WEDNESDAY. * WIND...WEST WINDS 25 TO 35 MPH WITH GUSTS IN EXCESS OF 60 MPH ABOVE TIMBERLINE. * MAIN IMPACT...SNOW AND CONSIDERABLE BLOWING SNOW WILL CREATE HAZARDOUS DRIVING CONDITIONS. WHITEOUT CONDITIONS CAN BE EXPECTED AT TIMES OVER THE HIGHER MOUNTAINS AND PASSES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ COZ038>051-180645- /O.NEW.KBOU.WS.A.0005.121219T1200Z-121220T0000Z/ 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- INCLUDING THE CITIES OF...FORT COLLINS...HEREFORD...LOVELAND... NUNN...ARVADA...BOULDER...GOLDEN...LAKEWOOD...LONGMONT...AURORA... BRIGHTON...CITY OF DENVER...DENVER INTERNATIONAL AIRPORT... HIGHLANDS RANCH...LITTLETON...PARKER...CASTLE ROCK...ELBERT... FONDIS...KIOWA...LARKSPUR...BRIGGSDALE...GROVER...PAWNEE BUTTES... RAYMER...STONEHAM...EATON...FORT LUPTON...GREELEY...ROGGEN... BRUSH...FORT MORGAN...GOODRICH...WIGGINS...BENNETT...BYERS... DEER TRAIL...LEADER...AGATE...HUGO...LIMON...MATHESON...FORDER... KARVAL...KUTCH...PUNKIN CENTER...CROOK...MERINO...STERLING... PEETZ...AKRON...COPE...LAST CHANCE...OTIS...JULESBURG...OVID... SEDGWICK...AMHERST...HAXTUN...HOLYOKE 336 PM MST MON DEC 17 2012 ...WINTER STORM WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY AFTERNOON... THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A WINTER STORM WATCH...WHICH IS IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY AFTERNOON. * TIMING...SNOW WILL DEVELOP LATE TUESDAY NIGHT AND CONTINUE THROUGH WEDNESDAY AFTERNOON. * MAIN IMPACT...TOTAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES POSSIBLE. NORTH TO NORTHEAST WINDS 20 TO 30 MPH WITH GUSTS TO 40 MPH WILL PRODUCE EXTENSIVE BLOWING AND DRIFTING SNOW. * OTHER IMPACTS...ROAD CLOSURES POSSIBLE DUE TO BLOWING AND DRIFTING SNOW...INCLUDING INTERSTATES 70 AND 76. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT SNOW THAT MAY IMPACT TRAVEL. CONTINUE TO MONITOR THE LATEST FORECASTS. && $$
110 WWUS45 KBOU 180544 WSWBOU URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER/BOULDER CO 1044 PM MST MON DEC 17 2012 ...SNOW AND BLOWING SNOW CONTINUES TONIGHT FOR THE NORTHERN MOUNTAINS OF COLORADO... ...WINTER STORM WATCH FOR THE NORTHEAST COLORADO PLAINS FOR LATE TUESDAY NIGHT AND WEDNESDAY... .A PERIOD OF HEAVY SNOW WILL OCCUR OVERNIGHT IN THE NORTH CENTRAL COLORADO MOUNTAINS. THE HEAVIEST SNOW WILL SHIFT FROM RABBIT EARS AND CAMERON PASSES ACROSS THE INTERSTATE 70 CORRIDOR DURING THE EARLY MORNING HOURS...WITH SNOW BECOMING LIGHTER TUESDAY MORNING. GUSTY WINDS WILL PRODUCE BLOWING AND DRIFTING SNOW AND POOR VISIBILITIES ABOVE 10 THOUSAND FEET. SNOW WILL INCREASE AGAIN IN THE MOUNTAINS TUESDAY NIGHT AND WEDNESDAY. SNOW IS EXPECTED TO DEVELOP ACROSS THE URBAN CORRIDOR AND NORTHEAST PLAINS LATE TUESDAY NIGHT INTO WEDNESDAY. THE COMBINATION OF SNOW AND BLOWING SNOW WILL PRODUCE THE POTENTIAL FOR WINTER DRIVING CONDITIONS ALONG INTERSTATES 70 AND 76 AS WELL. COZ031-181200- /O.CON.KBOU.WS.W.0009.000000T0000Z-121218T1200Z/ WEST JACKSON AND WEST GRAND COUNTIES ABOVE 9000 FEET- INCLUDING THE CITIES OF... EAST SLOPES PARK AND NORTHERN GORE RANGES...GORE PASS... RABBIT EARS PASS 1044 PM MST MON DEC 17 2012 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST TUESDAY... * TIMING...SNOW AND STRONG WIND WILL CONTINUE THROUGH TONIGHT. THE SNOW WILL BE HEAVY AT TIMES. THE STRONG WINDS WILL CREATE CONSIDERABLE BLOWING AND DRIFTING SNOW. * SNOW ACCUMULATIONS...STORM TOTALS OF 10 TO 16 INCHES BY EARLY TUESDAY MORNING. LIGHTER SNOW IS EXPECTED ON TUESDAY...BUT SNOW WILL INCREASE AGAIN TUESDAY NIGHT INTO WEDNESDAY. * WIND...WEST WINDS 20 TO 30 MPH WITH GUSTS UP TO 40 MPH OVER EXPOSED RIDGES. * MAIN IMPACT...STRONG WINDS AND PERIODS OF HEAVY SNOW WILL PRODUCE HARSH WINTER CONDITIONS AND DANGEROUS TRAVEL WITH LOW VISIBILITIES IN EXPOSED AREAS. 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. && $$ COZ033-181200- /O.CON.KBOU.WW.Y.0021.000000T0000Z-121218T1200Z/ SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/ NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET- INCLUDING THE CITIES OF...CAMERON PASS... LARAMIE AND MEDICINE BOW MOUNTAINS...RABBIT EARS RANGE... ROCKY MOUNTAIN NATIONAL PARK...WILLOW CREEK PASS 1044 PM MST MON DEC 17 2012 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST TUESDAY... * TIMING...SNOW WILL CONTINUE THROUGH TONIGHT AND WILL BE HEAVY AT TIMES. * SNOW ACCUMULATIONS...5 TO 10 INCHES BY EARLY TUESDAY MORNING. LIGHTER SNOW IS EXPECTED ON TUESDAY...BUT THE SNOW WILL INCREASE AGAIN TUESDAY NIGHT INTO WEDNESDAY. * WIND...WEST WINDS 20 TO 30 MPH WITH GUSTS TO 50 MPH ABOVE TIMBERLINE. * MAIN IMPACT...SNOW AND CONSIDERABLE BLOWING SNOW WILL CREATE HAZARDOUS DRIVING CONDITIONS. WHITEOUT CONDITIONS CAN BE EXPECTED AT TIMES OVER THE HIGHER MOUNTAINS AND PASSES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ COZ034-181200- /O.CON.KBOU.WW.Y.0021.000000T0000Z-121218T1200Z/ 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 1044 PM MST MON DEC 17 2012 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST TUESDAY... * TIMING...SNOW WILL CONTINUE THROUGH TONIGHT AND WILL BE HEAVY AT TIMES. * SNOW ACCUMULATIONS...4 TO 8 INCHES BY EARLY TUESDAY MORNING. LIGHTER SNOW IS EXPECTED ON TUESDAY...BUT SNOW WILL INCREASE AGAIN TUESDAY NIGHT INTO WEDNESDAY. * WIND...WEST WINDS 20 TO 30 MPH WITH GUSTS TO 50 MPH ABOVE TIMBERLINE. * MAIN IMPACT...SNOW AND CONSIDERABLE BLOWING SNOW WILL CREATE HAZARDOUS DRIVING CONDITIONS. WHITEOUT CONDITIONS CAN BE EXPECTED AT TIMES OVER THE HIGHER MOUNTAINS AND PASSES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ COZ038>051-181300- /O.CON.KBOU.WS.A.0005.121219T1200Z-121220T0000Z/ 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- INCLUDING THE CITIES OF...FORT COLLINS...HEREFORD...LOVELAND... NUNN...ARVADA...BOULDER...GOLDEN...LAKEWOOD...LONGMONT...AURORA... BRIGHTON...CITY OF DENVER...DENVER INTERNATIONAL AIRPORT... HIGHLANDS RANCH...LITTLETON...PARKER...CASTLE ROCK...ELBERT... FONDIS...KIOWA...LARKSPUR...BRIGGSDALE...GROVER...PAWNEE BUTTES... RAYMER...STONEHAM...EATON...FORT LUPTON...GREELEY...ROGGEN... BRUSH...FORT MORGAN...GOODRICH...WIGGINS...BENNETT...BYERS... DEER TRAIL...LEADER...AGATE...HUGO...LIMON...MATHESON...FORDER... KARVAL...KUTCH...PUNKIN CENTER...CROOK...MERINO...STERLING... PEETZ...AKRON...COPE...LAST CHANCE...OTIS...JULESBURG...OVID... SEDGWICK...AMHERST...HAXTUN...HOLYOKE 1044 PM MST MON DEC 17 2012 ...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY AFTERNOON... * TIMING...SNOW WILL DEVELOP LATE TUESDAY NIGHT AND CONTINUE THROUGH WEDNESDAY AFTERNOON. * MAIN IMPACT...TOTAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES POSSIBLE. NORTH TO NORTHEAST WINDS 20 TO 30 MPH WITH GUSTS TO 40 MPH WILL PRODUCE EXTENSIVE BLOWING AND DRIFTING SNOW. * OTHER IMPACTS...ROAD CLOSURES POSSIBLE DUE TO BLOWING AND DRIFTING SNOW...INCLUDING INTERSTATES 70 AND 76. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT SNOW THAT MAY IMPACT TRAVEL. CONTINUE TO MONITOR THE LATEST FORECASTS. && $$ GIMMESTAD
690 WWUS45 KBOU 181216 WSWBOU URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER/BOULDER CO 516 AM MST TUE DEC 18 2012 ...WINTER STORM WATCH FOR THE NORTHEAST COLORADO PLAINS FOR LATE TONIGHT AND WEDNESDAY... .SNOW IS EXPECTED TO DEVELOP ACROSS THE URBAN CORRIDOR AND NORTHEAST PLAINS LATE TONIGHT INTO WEDNESDAY. THE COMBINATION OF SNOW AND BLOWING SNOW WILL PRODUCE THE POTENTIAL FOR WINTER DRIVING CONDITIONS INCLUDING ON INTERSTATES 70 AND 76. COZ031-181330- /O.EXP.KBOU.WS.W.0009.000000T0000Z-121218T1200Z/ WEST JACKSON AND WEST GRAND COUNTIES ABOVE 9000 FEET- INCLUDING THE CITIES OF... EAST SLOPES PARK AND NORTHERN GORE RANGES...GORE PASS... RABBIT EARS PASS 516 AM MST TUE DEC 18 2012 ...WINTER STORM WARNING HAS EXPIRED... SNOWFALL WILL BEGIN TO DIMINISH TODAY FROM YESTERDAYS STORM. HOWEVER ANOTHER 2 TO 4 INCHES OF SNOW COULD FALL THROUGHOUT THE COURSE OF THE DAY TODAY. $$ COZ033-034-181330- /O.EXP.KBOU.WW.Y.0021.000000T0000Z-121218T1200Z/ SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/ NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET- SOUTH AND SOUTHEAST GRAND/WEST CENTRAL AND SOUTHWEST BOULDER/ GILPIN/CLEAR CREEK/SUMMIT/NORTH AND WEST PARK COUNTIES ABOVE 9000 FEET- INCLUDING THE CITIES OF...CAMERON PASS... LARAMIE AND MEDICINE BOW MOUNTAINS...RABBIT EARS RANGE... ROCKY MOUNTAIN NATIONAL PARK...WILLOW CREEK PASS... BERTHOUD PASS...BRECKENRIDGE...EAST SLOPES MOSQUITO RANGE... EAST SLOPES SOUTHERN GORE RANGE...EISENHOWER TUNNEL... INDIAN PEAKS...KENOSHA MOUNTAINS...MOUNT EVANS... WILLIAMS FORK MOUNTAINS...WINTER PARK 516 AM MST TUE DEC 18 2012 ...WINTER WEATHER ADVISORY HAS EXPIRED... SNOWFALL WILL BEGIN TO DIMINISH TODAY FROM YESTERDAYS STORM. HOWEVER ANOTHER 1 TO 4 INCHES OF SNOW COULD FALL THROUGHOUT THE COURSE OF THE DAY TODAY. $$ COZ038>051-182315- /O.CON.KBOU.WS.A.0005.121219T1200Z-121220T0000Z/ 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- INCLUDING THE CITIES OF...FORT COLLINS...HEREFORD...LOVELAND... NUNN...ARVADA...BOULDER...GOLDEN...LAKEWOOD...LONGMONT...AURORA... BRIGHTON...CITY OF DENVER...DENVER INTERNATIONAL AIRPORT... HIGHLANDS RANCH...LITTLETON...PARKER...CASTLE ROCK...ELBERT... FONDIS...KIOWA...LARKSPUR...BRIGGSDALE...GROVER...PAWNEE BUTTES... RAYMER...STONEHAM...EATON...FORT LUPTON...GREELEY...ROGGEN... BRUSH...FORT MORGAN...GOODRICH...WIGGINS...BENNETT...BYERS... DEER TRAIL...LEADER...AGATE...HUGO...LIMON...MATHESON...FORDER... KARVAL...KUTCH...PUNKIN CENTER...CROOK...MERINO...STERLING... PEETZ...AKRON...COPE...LAST CHANCE...OTIS...JULESBURG...OVID... SEDGWICK...AMHERST...HAXTUN...HOLYOKE 516 AM MST TUE DEC 18 2012 ...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH WEDNESDAY AFTERNOON... * TIMING...SNOW WILL DEVELOP LATE TONIGHT AND CONTINUE THROUGH WEDNESDAY AFTERNOON. THE HEAVIEST SNOWFALL RATES WILL OCCUR IN THE MORNING. * MAIN IMPACT...TOTAL SNOW ACCUMULATIONS OF 3 TO 8 INCHES POSSIBLE. NORTH TO NORTHEAST WINDS 20 TO 30 MPH WITH GUSTS TO 45 MPH WILL PRODUCE EXTENSIVE BLOWING AND DRIFTING SNOW. * OTHER IMPACTS...ROAD CLOSURES POSSIBLE DUE TO BLOWING AND DRIFTING SNOW...INCLUDING INTERSTATES 70 AND 76. TRAVEL MAY BE DIFFICULT AREA-WIDE DURING THE MORNING HOURS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT SNOW THAT MAY IMPACT TRAVEL. CONTINUE TO MONITOR THE LATEST FORECASTS. && $$
What forecasters said that day
The local office's own words before this winter weather advisory 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 weather advisory went out at Dec 16, 10:11 AM MST, 4 hours 36 minutes earlier.
Area forecast discussion, Dec 16, 10:11 AM MST, 4 hours 36 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER/BOULDER CO 1011 AM MST SUN DEC 16 2012 .UPDATE...FOG WAS LIFTING BUT STRATUS DECK IS SLOW TO ERODE WITH SHALLOW INVERSION IN PLACE. HOWEVER...WESTERLY FLOW ALOFT AND LOW LEVEL GRADIENT WAS STRENGTHENING WHICH SHOULD HELP BREAK THE LOW CLOUDS WITH INCREASING DOWNLSOPE/LEE TROUGHING. ALL IN ALL...IT STILL A SLOW PROCESS ESPECIALLY WITH SOME INCREASE IN MOUNTAIN WAVE CLOUDINESS. HAVE CUT BACK TEMPS A COUPLE DEGREES AND ALSO INCREASED CLOUD COVER. SNOW AND WIND IS STILL ON TRACK TO INCREASE IN THE MOUNTAINS AND GOING FORECAST LOOKS GOOD WITH INCREASE IN SNOW RATES THIS AFTERNOON AND TONIGHT. && .AVIATION...DIFFICULT FORECAST WITH COOL LOW LEVEL AIR AND STRATUS STILL LURKING TO THE NORTH OF KDEN AND KBJC. MOST LIKELY SCENARIO IS FOR WINDS TO TURN A BIT MORE NORTHERLY WITH A CHANCE OF STRATUS/IFR CEILINGS PUSHING BACK IN FROM NOW TIL 19Z...WILL MONITOR CLOSELY. WIND FORECAST QUITE VARIABLE WITH LOW CONFIDENCE THROUGH THE AFTERNOON. STRONGER WESTERLIES SHOULD EVENTUALLY DOMINATE BY MONDAY AFTERNOON. && .PREV DISCUSSION... /ISSUED 423 AM MST SUN DEC 16 2012/ SHORT TERM...MUCH OF THIS SHIFT HAS BEEN SPENT DEALING WITH THE WIDE AREA FOG THAT FORMED JUST BEFORE MIDNIGHT WHEN SKIES BRIEFLY CLEARED. BNDRY LAYER WAS ALREADY RELATIVELY MOIST WITH TEMP/DEWPT SPREADS OF 3-5C...THEN SKIES CLEARED AND TEMPS FELL. FOG HAS BEEN THICKEST ACROSS CENTRAL PORTIONS OF THE I-25 URBAN CORRIDOR INCLUDING DENVER INTERNATIONAL AIRPORT WHERE VSBYS HAVE REMAINED AT OR BELOW A HALF MILE IN THE FOG FOR THE PAST FEW HOURS. DENVER METRO TRAFFIC CAMS NOW SHOWING FOG AS FAR SOUTH AS CENTENNIAL AIRPORT WHERE THE VISIBILITY JUST FELL TO A QUARTER MILE. WITH THE FOG BECOMING MORE WIDESPREAD WILL BE ISSUING A DENSE FOG VERY SHORTLY FOR THE DENVER METRO AREA AND NEARBY PLAINS INCLUDING GREELEY. NOW FOR THE TODAY...THE UPPER LOW TIGHTLY WRAPPED UP OVER SERN COLORADO AT THIS HOUR...WILL CONTINUE TO RACE EAST AND EXIT THE STATE IN THE NEXT FEW HOURS. ONCE THAT HAPPENS...THE LIGHT EASTERLY SFC WINDS ON THE PLAINS SHOULD BECOME PREDOMINANTLY WEST- NORTHWESTERLY THROUGH THE MORNING HOURS. AND AS WE PROCEED THROUGH THE AFTERNOON WIND SPDS WILL INCREASE AS THE SFC PRESSURE FALLS ACROSS THE PLAINS. COULD SEE GUSTS APPROACHING 25KTS NEAR THE BASE OF THE FOOTHILLS BY LATE IN THE DAY. THIS DOWNSLOPING FLOW WILL LOWER HUMIDITIES AND ANY PCPN ON THE PLAINS SHOULD COME TO AN END BEFORE NOON. NOW FOR THE HIGH COUNTRY. SNOW SHOWERS LINGERING OVER THE UPPER SLOPES AND RIDGETOPS AT THIS HOUR WILL LET UP FOR A WHILE THIS MORNING AS THE STABLE LAYER AT MTN TOP LEVEL STRENGTHENS WITH THE PASSAGE OF WEAK SHORTWAVE RIDGE. THEN DURING THE AFTERNOON...LOOK FOR SNOWFALL TO PICK UP AGAIN IN THE HIGH COUNTRY AS MOISTURE AND COOLER AIR MOVES IN ON MODERATE NORTHWESTERLY FLOW ALOFT WITH THE NEXT SHORTWAVE TROUGH. HOWEVER...ITS OVERNIGHT WHEN DEEPER MOISTURE AND STRONGER WINDS ALOFT SPREAD OVER THE NORTH CENTRAL MTNS AND HIGH VALLEYS. MODEL CROSS SECTIONS INDICATE A STEADY INCREASE IN 700-500MB W-NWLY FLOW OVERNIGHT. MODELS ALSO INDICATE THE FORMATION OF A WELL DEVELOPED MTN WAVE ALONG THE FRONT RANGE WHICH HELPS TO DRIVE HIGH LEVEL MOMENTUM DOWN THE LEE SLOPE OF THE FRONT RANGE LATE TONIGHT. COULD SEE GUSTS EASILY APPROACHING 50KTS AT MTN TOP LEVEL AFTER MIDNIGHT...WITH 30-40KT GUSTS IN THE HIGHER FRONT RANGE FOOTHILLS. RIGHT NOW...A WINTER WEATHER ADVISORY FOR THE GORE/PARK RANGES...ZONE 31...GOES INTO EFFECT AT NOON TODAY AND WILL RUN UNTIL 5 AM MONDAY. SEVERAL INCHES OF SNOW AND BLOWING SNOW STILL LOOK LIKELY. SHOULD IT APPEAR THAT SIMILAR CONDITIONS WILL DEVELOP IN MTN ZONES 33 AND 34 OVERNIGHT...AN ADVSY MAY BE NECESSARY HERE AS WELL. RIGHT NOW THE MAIN CONCERN IN MTN ZONES 33 AND 34 AND FOOTHILLS ZONES 35 AND 36 WILL BE THE STG AND GUSTY WINDS OVERNIGHT. BLOWING SNOW MAY ALSO BECOME A CONCERN. LONG TERM...AN ACTIVE WEATHER PATTERN SHAPING UP FOR AT LEAST THROUGH MID WEEK ACROSS COLORADO...ESPECIALLY IN THE MOUNTAINS WITH GUSTY WINDS AND OCCASIONAL SNOW. FOR MONDAY AND MONDAY NIGHT...A STRONG WESTERLY FLOW ALOFT WILL BE ACROSS COLORADO WITH POWERFUL 150+KT JET ACROSS FAR NORTHERN COLORADO. STRONG AND GUSTY WINDS WILL ACCOMPANY THE JET OVER THE MOUNTAIN PASSES AND EAST SLOPES. CROSS SECTIONS INDICATE 40-50KT CROSS BARRIER FLOW MONDAY WITH DECENT MOUNTAIN TOP STABILITY. HOWEVER GIVEN THE MOISTURE DEPTH AND INCREASED SPEED SHEAR...DOUBT THERE WILL BE GOOD WAVE AMPLIFICATION TO BRING WIDESPREAD HIGH WINDS. WILL CERTAINLY SEE SOME GUSTS IN THE 50-65 MPH RANGE BUT HIGH WINDS ABOVE 75 MPH WILL BE VERY LOCALIZED AND CONFINED TO HIGHER MOUNTAIN PEAKS. WILL CONTINUE TO SEE SNOW CONTINUING ACROSS THE MOUNTAINS WITH PROBABLY THE HEAVIEST SNOW ON MONDAY NIGHT AND EARLY TUESDAY WITH PROXIMITY OF THE STRONG UPPER JET. WE MAY NEED SOME WINTER HILITES FOR THE MOUNTAIN BUT SINCE THERE IS A CURRENT ADVISORY DON'T WANT TO CONFUSE TOO MANY PERIODS WITH HILITES. APPEARS ZONE 31 WILL LIKELY TO THE BEST IN SNOWFALL POTENTIAL THROUGH THE PERIOD WITH FAVORED OROGRAPHIC FLOW AND THE JET. THE MAIN UPPER TROF WILL MOVE ACROSS COLORADO LATE TUESDAY NIGHT AND WEDNESDAY WITH STRONG COLD FRONT MOVING ACROSS NORTHEAST COLORADO LATE TUESDAY NIGHT WITH INCREASING MOISTURE AND UPSLOPE FLOW BY WED AM. MODEL CONSISTENCY WITH THIS FEATURE WILL EXPRESS INCREASING CONFIDENCE IN POTENTIAL SNOWFALL FOR ALL OF NORTHERN COLORADO. HAVE BOOSTED POPS TO HIGH CHANCE FOR NOW AS THIS MAY BE THE FIRST WIDESPREAD SNOW EVENT FOR ALL THE FORECAST AREA IN QUITE SOME TIME. SNOW WILL DIMINISH LATER TUESDAY THEN A COUPLE OF DRY DAYS FOR THE STATE ON THURSDAY AND FRIDAY. BIGGER MODEL DIFFERENCES ARE SHOWING UP BY NEXT WEEKEND WITH EUROPEAN SHOWING A DEEPER TROF DEVELOPING OFF THE WEST COAST WHILE GFS SHOWING A MORE ZONAL FLOW PATTERN. WILL KEEP THE EXTENDED DRY THRU THE WEEKEND AND WILL DISCOUNT THE INCREASE IN MOISTURE AS NOTED BY GFS. AVIATION...DENSE FOG ACROSS THE DENVER METRO AREA AT THIS HOUR. VISIBILITIES RUNNING IN THE 1/4 TO 1/2 MILE. DO NOT SEE THIS FOG DISSIPATING BEFORE 15Z THIS MORNING..AND ONLY GRADUALLY AS WINDS WILL REMAIN LIGHT AND VARIABLE. BY LATE THIS MORNING...A LIGHT DRAINAGE WIND SSHOULD SET UP WHICH WILL BEGIN TO FLUSH OUT LOW LEVEL MOISTURE AND RISING VSBYS AND CEILINGS AT DENVER AREA AIRPORT. SHOULD SEE VFR CONDITIONS AT ALL AIRPORTS 17Z THIS MORNING IF NOT SOONER AT APA AND BJC. VFR CONDITIONS WILL THEN CONTINUE THROUGH TONIGHT...WITH GUSTY WESTERLY WINDS FORMING NEAR THE FOOTHILLS AFTER DARK WITH THE DEVELOPING MOUNTAIN WAVE. && .BOU WATCHES/WARNINGS/ADVISORIES... WINTER WEATHER ADVISORY UNTIL 5 AM MST MONDAY FOR COZ031. && SHORT TERM...BARJENBRUCH LONG TERM....ENTREKIN AVIATION...BARJENBRUCH
Hazardous weather outlook, Dec 16, 10:59 AM MST, 3 hours 48 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER/BOULDER CO 1059 AM MST SUN DEC 16 2012 COZ030>051-171800- 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- 1059 AM MST SUN DEC 16 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT SNOWFALL WILL INCREASE AGAIN IN THE COLORADO HIGH COUNTRY THIS AFTERNOON AND EVENING AS THE NEXT BATCH OF PACIFIC MOISTURE SPREADS ACROSS THE STATE. STRONG WEST TO NORTHWEST FLOW ALOFT WILL COMBINE WITH THE SNOW TO PRODUCE BLOWING AND DRIFTING SNOW AND HAZARDOUS DRIVING CONDITIONS. WIND GUSTS BETWEEN 40 AND 65 MPH CAN BE EXPECTED OVER THE HIGHER MOUNTAINS AND PASSES. ADDITIONAL SNOW ACCUMULATIONS OF 2 TO 6 INCHES CAN BE EXPECTED IN THE FRONT RANGE MOUNTAINS AND SUMMIT COUNTY BY MONDAY MORNING...WITH 5 TO 10 INCHES IN THE RABBIT EARS PASS AREA AND SIERRA MADRE RANGE. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY STRONG WESTERLY FLOW ALOFT AND A SERIES OF UPPER LEVEL DISTURBANCES WILL MOVE ACROSS NORTHERN COLORADO FROM MONDAY THROUGH WEDNESDAY. OCCASIONAL SNOW AND GUSTY WINDS WILL CONTINUE OVER THE MOUNTAINS WITH WIND GUSTS UP TO 60 MPH POSSIBLE OVER RIDGES AND ALONG EASTERN MOUNTAIN SLOPES. DRY WEATHER WILL CONTINUE ON THE PLAINS WITH MILD TEMPERATURES BUT OCCASIONALLY GUSTY WINDS...ESPECIALLY NEAR THE FOOTHILLS. GUSTS UP TO 35 MPH MAY DEVELOP. A STRONG COLD FRONT WILL MOVE INTO NORTHEAST COLORADO WEDNESDAY MORNING AS A VIGOROUS UPPER LEVEL DISTURBANCE MOVES OVER THE STATE. COLDER TEMPERATURES...GUSTY NORTH WINDS AND A GOOD CHANCE OF SNOW WILL SPREAD ACROSS THE PLAINS WEDNESDAY AS SNOW ALSO CONTINUES FALLING IN THE MOUNTAINS. DRIER CONDITIONS AND GRADUALLY WARMING TEMPERATURES WILL RETURN THURSDAY THROUGH SATURDAY ACROSS NORTHERN COLORADO AS AN UPPER RIDGE BUILDS OVER THE STATE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT. BARJENBRUCH/DANKERS
In the hours before
Local storm report, Dec 16, 11:35 AM MST, 3 hours 12 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
1135 AM MST SUN DEC 16 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0851 AM SNOW 2 S STERLING 40.62N 103.22W
12/16/2012 E2.0 INCH LOGAN CO TRAINED SPOTTER
1030 AM SNOW 11 ESE HOLYOKE 40.53N 102.10W
12/16/2012 E4.8 INCH PHILLIPS CO TRAINED SPOTTER
&&
KBOWENThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 16, 4:32 AM MST | Dense Fog Advisory | BOU | Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 3 more | 4 hr |
| Dec 16, 2:47 PM MST | Winter Storm Warning | BOU | Grand, Jackson | 38 hr |
Nearby
Winter Weather Advisories in Colorado, 2012Every winter weather advisory 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.