Alert archive / Colorado / Blizzard Warnings in 2007

Blizzard Warning 1, NWS Denver/Boulder, CO

January 21, 20075 counties in Colorado

NWS Denver/Boulder, CO issued this blizzard warning at Jan 21, 2007, 9:53 AM MST for 5 counties in Colorado. It was in force for 5 hr. 14 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 21, 2007, 9:53 AM MST (16:53 UTC)
Expired
Jan 21, 2007, 2:56 PM MST
In force
5 hr
Issued by
NWS Denver/Boulder, CO

Counties Adams County, CO, Arapahoe County, CO, Elbert County, CO, Lincoln County, CO, Washington County, CO

The radar

The Denver radar (KFTG), 61 km from the middle of the area, began a volume at 16:58 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Jan 21, 10:00 AM MSTHEAVY SNOW 8Last Chance, CO
Jan 21, 10:11 AM MSTSNOW 4.56 Ssw Elizabeth, COTHREE FOOT DRIFTS
Jan 21, 11:00 AM MSTSNOW 3Centennial, CO
Jan 21, 11:01 AM MSTSNOW 3.6Ne Thornton, CO
Jan 21, 11:24 AM MSTSNOW 41 Nnw Centennial, CO
Jan 21, 11:54 AM MSTSNOW 35 Ene Arvada, CO
Jan 21, 12:05 PM MSTHEAVY SNOW 85 Ssw Arapahoe Park, CO
Jan 21, 12:16 PM MSTSNOW 5.52 Nw Arapahoe Park, CO
Jan 21, 1:00 PM MSTSNOW 61 Se Aurora, CO
Jan 21, 1:20 PM MSTHEAVY SNOW 76 Ssw Elizabeth, COTHREE TO FOUR FOOT DRIFTS
Jan 21, 1:25 PM MSTHEAVY SNOW 78 Se Watkins, CO3 1/2 FOOT DRIFTS
Jan 21, 1:49 PM MSTSNOW 46 Ne Arvada, CO
Jan 21, 1:57 PM MSTHEAVY SNOW 11.85 Ssw Arapahoe Park, COTHREE FOOT DRIFTS
Jan 21, 2:01 PM MSTHEAVY SNOW 8.3Aurora, 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, 4.9 hours before the alert went out and 68 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 12:00Z on 2007-01-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2007-01-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -110 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
617 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
-110 m²/s²
0-3 km storm-relative helicity
-67 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WWUS45 KBOU 211653
WSWBOU

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE DENVER CO
953 AM MST SUN JAN 21 2007

COZ045-046-049-220100-
/O.UPG.KBOU.SB.Y.0005.000000T0000Z-070122T0600Z/
/O.NEW.KBOU.BZ.W.0001.070121T1653Z-070122T0600Z/
CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES-
NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN
COUNTY-WASHINGTON COUNTY-
INCLUDING...BENNETT...BYERS...DEER TRAIL...LEADER...AGATE...
HUGO...LIMON...MATHESON...AKRON...COPE...LAST CHANCE...OTIS
953 AM MST SUN JAN 21 2007

...BLIZZARD WARNING IN EFFECT UNTIL 11 PM MST THIS EVENING...

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A BLIZZARD
WARNING...WHICH IS IN EFFECT UNTIL 11 PM MST THIS EVENING. THE
SNOW AND BLOWING SNOW ADVISORY IS NO LONGER IN EFFECT. 

AT 930 AM MST...A SPOTTER REPORTED BLIZZARD CONDITIONS AT CEDAR
POINT. SUSTAINED WINDS TO 46 MPH WERE MEASURED WITH GUSTS IN
EXCESS OF 55 MPH. STATE HIGHWAY 86 WAS REPORTEDLY CLOSED DUE TO
BLOWING AND DRIFTING SNOW...UP TO 3 FEET IN DEPTH.

NORTH WINDS 20 TO 35 MPH WILL BE COMMON THROUGH THIS EVENING WITH
GUSTS IN EXCESS OF 50 MPH. ADDITIONAL SNOW AMOUNTS FROM 3 TO 7
INCHES ARE POSSIBLE AND WILL CAUSE EXTENSIVE BLOWING AND DRIFTING
SNOW.

TRAVELERS ALONG THE INTERSTATE 70 CORRIDOR BETWEEN DENVER AND THE
KANSAS STATE LINE SHOULD EITHER DELAY TRAVEL OR FIND AN ALTERNATE
ROUTE. WHITEOUT CONDITIONS CAN BE EXPECTED AND ROADWAYS WILL BE
SNOW PACKED.

A BLIZZARD WARNING MEANS SEVERE WINTER WEATHER CONDITIONS ARE
OCCURRING OR IMMINENT. SUSTAINED WIND AND/OR FREQUENT WIND GUSTS
OF 35 MPH OR HIGHER WILL COMBINE WITH CONSIDERABLE FALLING AND
BLOWING SNOW TO PRODUCE WIDESPREAD VISIBILITIES BELOW ONE QUARTER
OF A MILE. TRAVEL WILL BE EXTREMELY DANGEROUS AND IS DISCOURAGED
IN THESE WHITEOUT CONDITIONS. IF YOU MUST TRAVEL...HAVE A WINTER
SURVIVAL KIT WITH YOU. IF YOU GET STRANDED...STAY WITH YOUR
VEHICLE AND WAIT FOR HELP TO ARRIVE.

$$

COZ042-044-048-050-051-220100-
/O.CON.KBOU.SB.Y.0005.000000T0000Z-070122T0600Z/
NORTHEAST WELD COUNTY-MORGAN COUNTY-LOGAN COUNTY-SEDGWICK COUNTY-
PHILLIPS COUNTY-
INCLUDING...BRIGGSDALE...GROVER...PAWNEE BUTTES...RAYMER...
STONEHAM...BRUSH...FORT MORGAN...GOODRICH...WIGGINS...CROOK...
MERINO...STERLING...PEETZ...JULESBURG...OVID...SEDGWICK...
AMHERST...HAXTUN...HOLYOKE
953 AM MST SUN JAN 21 2007

...SNOW AND BLOWING SNOW ADVISORY REMAINS IN EFFECT UNTIL 11 PM
MST THIS EVENING...

A SNOW AND BLOWING SNOW ADVISORY REMAINS IN EFFECT UNTIL 11 PM
MST THIS EVENING. 

OCCASIONAL LIGHT SNOW IS EXPECTED OVER THE NORTHEAST CORNER OF
COLORADO TODAY...DIMINISHING FROM NORTH TO SOUTH THIS EVENING.
HEAVIER SNOW IS STILL EXPECTED IN AREAS WEST OF STERLING AND
AKRON. STORM TOTAL SNOWFALL WILL RANGE FROM 5 TO 10 INCHES. NORTH
WINDS AT 20 TO 30 MPH WILL CREATE WIDESPREAD BLOWING AND DRIFTING
SNOW.

A SNOW AND BLOWING SNOW ADVISORY MEANS THAT VISIBILITIES WILL BE
LIMITED DUE TO A COMBINATION OF FALLING AND BLOWING SNOW. ICY OR
SNOW PACKED ROADS AND SIGNIFICANT DRIFTING SNOW CAN BE EXPECTED.
USE CAUTION WHEN TRAVELING...ESPECIALLY IN OPEN AREAS.

$$

COZ038>041-043-047-220100-
/O.CON.KBOU.SB.Y.0005.000000T0000Z-070122T0600Z/
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-
CENTRAL AND SOUTH WELD COUNTY-
SOUTHEAST ELBERT COUNTY BELOW 6000 FEET/SOUTH LINCOLN COUNTY-
INCLUDING...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...EATON...FORT LUPTON...GREELEY...ROGGEN...FORDER...
KARVAL...KUTCH...PUNKIN CENTER
953 AM MST SUN JAN 21 2007

...SNOW AND BLOWING SNOW ADVISORY REMAINS IN EFFECT UNTIL 11 PM
MST THIS EVENING...

A SNOW AND BLOWING SNOW ADVISORY REMAINS IN EFFECT UNTIL 11 PM
MST THIS EVENING. 

SNOW WILL SPREAD FROM AREAS NORTH OF DENVER SOUTH TO THE PALMER
DIVIDE REGION THIS MORNING...AND CONTINUE THROUGH THIS EVENING.
SNOW MAY BE HEAVY AT TIMES WITH SNOWFALL TODAY AND TONIGHT
RANGING FROM 4 TO 8 INCHES. FROM JEFFERSON COUNTY ACROSS DOUGLAS
AND WESTERN ELBERT COUNTIES UP TO 10 INCHES IS POSSIBLE. NORTH
WINDS AT 15 TO 25 MPH WITH GUSTS TO 35 MPH WILL CREATE WIDESPREAD
BLOWING AND DRIFTING SNOW IN AREAS ALONG AND EAST OF INTERSTATE
25. THERE MAY BE ENOUGH DRIFTING SNOW TO CLOSE ROADS.

A SNOW AND BLOWING SNOW ADVISORY MEANS THAT VISIBILITIES WILL BE
LIMITED DUE TO A COMBINATION OF FALLING AND BLOWING SNOW. ICY OR
SNOW PACKED ROADS AND SIGNIFICANT DRIFTING SNOW SHOULD BE
EXPECTED. USE CAUTION WHEN TRAVELING...ESPECIALLY IN OPEN AREAS.

$$

COZ031-033>036-220100-
/O.CON.KBOU.SB.Y.0005.000000T0000Z-070122T0600Z/
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-LARIMER AND BOULDER COUNTIES BETWEEN 6000 AND 9000 FEET-
JEFFERSON AND WEST DOUGLAS COUNTIES ABOVE 6000 FEET/GILPIN/CLEAR
CREEK/NORTHEAST PARK COUNTIES BELOW 9000 FEET-
INCLUDING...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...ESTES PARK...GLENDEVEY...
NEDERLAND...RED FEATHER LAKES...BAILEY...CENTRAL CITY...
EVERGREEN...GEORGETOWN...IDAHO SPRINGS...WESTCREEK
953 AM MST SUN JAN 21 2007

...SNOW AND BLOWING SNOW ADVISORY REMAINS IN EFFECT UNTIL 11 PM
MST THIS EVENING...

A SNOW AND BLOWING SNOW ADVISORY REMAINS IN EFFECT UNTIL 11 PM
MST THIS EVENING. 

LIGHT SNOW WILL BECOME WIDESPREAD OVER THE NORTH CENTRAL COLORADO
MOUNTAINS THIS MORNING WITH AREAS OF HEAVY SNOW ALONG THE EAST
SLOPES OF THE FRONT RANGE. THE SNOW WILL DIMINISH FROM NORTH TO
SOUTH THIS EVENING. STORM TOTAL SNOWFALL WILL RANGE FROM 4 TO
12 INCHES WITH THE HEAVIEST AMOUNTS IN THE FRONT RANGE FOOTHILLS.
NORTH TO NORTHEAST WINDS AT 15 TO 25 MPH WITH GUSTS AS HIGH AS
40 MPH WILL CAUSE WIDESPREAD BLOWING AND DRIFTING SNOW IN OPEN
AREAS...MAINLY ABOVE TIMBERLINE AND IN THE FOOTHILLS.

A SNOW AND BLOWING SNOW ADVISORY MEANS THAT VISIBILITIES WILL BE
LIMITED DUE TO A COMBINATION OF FALLING AND BLOWING SNOW. ICY OR
SNOW PACKED ROADS AND DRIFTING SNOW CAN BE EXPECTED. USE CAUTION
WHEN TRAVELING...ESPECIALLY IN OPEN AREAS.

$$
1 follow-up statement
000 
WWUS45 KBOU 212156
WSWBOU

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE DENVER CO
256 PM MST SUN JAN 21 2007

COZ045-046-049-220100-
/O.CAN.KBOU.BZ.W.0001.000000T0000Z-070122T0600Z/
/O.EXB.KBOU.SB.Y.0005.000000T0000Z-070122T0100Z/
CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES-
NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN
COUNTY-WASHINGTON COUNTY-
INCLUDING...BENNETT...BYERS...DEER TRAIL...LEADER...AGATE...
HUGO...LIMON...MATHESON...AKRON...COPE...LAST CHANCE...OTIS
256 PM MST SUN JAN 21 2007

...BLIZZARD WARNING IS CANCELLED...
...SNOW AND BLOWING SNOW ADVISORY IN EFFECT UNTIL 6 PM MST THIS
AFTERNOON...

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SNOW AND
BLOWING SNOW ADVISORY...WHICH IS IN EFFECT UNTIL 6 PM MST THIS
AFTERNOON. THE BLIZZARD WARNING HAS BEEN CANCELLED. 

SINCE THE STRONGER WIND GUSTS ARE NO LONGER ANTICIPATED...THE
BLIZZARD WARNING HAS BEEN DOWNGRADED TO A SNOW AND BLOWING SNOW
ADVISORY. NORTH WINDS FROM 15 TO 30 MPH WILL CONTINUE THROUGH THE
REMAINDER OF THE AFTERNOON WITH SOME AREAS OF BLOWING AND DRIFTING
SNOW. THE WIND AND SNOW IS EXPECTED TO DECREASE THROUGH THE
EVENING.  

THE INTERSTATE 70 CORRIDOR FROM AROUND BENNETT TO THE KANSAS
BORDER WILL REMAIN SNOW PACKED WITH REDUCED VISIBILITIES IN BLOWING
AND DRIFTING SNOW.

A SNOW AND BLOWING SNOW ADVISORY MEANS THAT VISIBILITIES WILL BE
LIMITED DUE TO A COMBINATION OF FALLING AND BLOWING SNOW. ICY OR
SNOW PACKED ROADS AND SIGNIFICANT DRIFTING SNOW CAN BE EXPECTED.
USE CAUTION WHEN TRAVELING...ESPECIALLY IN OPEN AREAS.



$$

COZ031-033>035-038-039-042-043-048-050-051-212300-
/O.CAN.KBOU.SB.Y.0005.000000T0000Z-070122T0600Z/
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-LARIMER AND BOULDER COUNTIES BETWEEN 6000 AND 9000 FEET-
LARIMER COUNTY BELOW 6000 FEET/NORTHWEST WELD COUNTY-
BOULDER AND JEFFERSON COUNTIES BELOW 6000 FEET/WEST BROOMFIELD
COUNTY-NORTHEAST WELD COUNTY-CENTRAL AND SOUTH WELD COUNTY-
LOGAN COUNTY-SEDGWICK COUNTY-PHILLIPS COUNTY-
INCLUDING...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...ESTES PARK...GLENDEVEY...
NEDERLAND...RED FEATHER LAKES...FORT COLLINS...HEREFORD...
LOVELAND...NUNN...ARVADA...BOULDER...GOLDEN...LAKEWOOD...
LONGMONT...BRIGGSDALE...GROVER...PAWNEE BUTTES...RAYMER...
STONEHAM...EATON...FORT LUPTON...GREELEY...ROGGEN...CROOK...
MERINO...STERLING...PEETZ...JULESBURG...OVID...SEDGWICK...
AMHERST...HAXTUN...HOLYOKE
256 PM MST SUN JAN 21 2007

...SNOW AND BLOWING SNOW ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN DENVER HAS CANCELLED THE SNOW AND
BLOWING SNOW ADVISORY. 



$$

COZ040-041-044-047-220100-
/O.EXT.KBOU.SB.Y.0005.000000T0000Z-070122T0100Z/
NORTH DOUGLAS COUNTY BELOW 6000 FEET/DENVER/WEST ADAMS AND
ARAPAHOE COUNTIES/EAST BROOMFIELD COUNTY-
ELBERT/CENTRAL AND EAST DOUGLAS COUNTIES ABOVE 6000 FEET-
MORGAN COUNTY-
SOUTHEAST ELBERT COUNTY BELOW 6000 FEET/SOUTH LINCOLN COUNTY-
INCLUDING...AURORA...BRIGHTON...CITY OF DENVER...
DENVER INTERNATIONAL AIRPORT...HIGHLANDS RANCH...LITTLETON...
PARKER...CASTLE ROCK...ELBERT...FONDIS...KIOWA...LARKSPUR...
BRUSH...FORT MORGAN...GOODRICH...WIGGINS...FORDER...KARVAL...
KUTCH...PUNKIN CENTER
256 PM MST SUN JAN 21 2007

...SNOW AND BLOWING SNOW ADVISORY NOW IN EFFECT UNTIL 6 PM MST
THIS AFTERNOON...

THE SNOW AND BLOWING SNOW ADVISORY IS NOW IN EFFECT UNTIL 6 PM
MST THIS AFTERNOON. 

LIGHT SNOW AND GUSTY NORTHERLY WINDS ARE EXPECTED TO CONTINUE
THROUGH THE REMAINDER OF THE AFTERNOON...BUT DECREASE THIS
EVENING. 

STORM TOTALS HAVE GENERALLY RANGED FROM 4 TO 8 INCHES ACROSS
DENVER...WITH 10 TO 12 INCHES REPORTED EAST AND SOUTH OF DENVER.
STRONG WINDS THROUGH EARLY THIS AFTERNOON HAD PRODUCED SNOW DRIFTS
FROM 2 TO 4 FEET IN DEPTH.

ADDITIONAL SNOW ACCUMULATIONS FROM 1 TO 2 INCHES ARE POSSIBLE
MAINLY SOUTH A LINE FROM DENVER TO BENNETT...WITH LITTLE
ADDITIONAL ACCUMULATION EXPECTED ELSEWHERE.

NORTH WINDS AT 15 TO 25 MPH WITH GUSTS TO 35 MPH WILL CREATE
AREAS OF BLOWING AND DRIFTING SNOW. THE WIND WILL BE STRONGEST
EAST OF INTERSTATE 25. 

A SNOW AND BLOWING SNOW ADVISORY MEANS THAT VISIBILITIES WILL BE
LIMITED DUE TO A COMBINATION OF FALLING AND BLOWING SNOW. ICY OR
SNOW PACKED ROADS AND SIGNIFICANT DRIFTING SNOW SHOULD BE
EXPECTED. USE CAUTION WHEN TRAVELING...ESPECIALLY IN OPEN AREAS.

$$

COZ036-220100-
/O.EXT.KBOU.SB.Y.0005.000000T0000Z-070122T0100Z/
JEFFERSON AND WEST DOUGLAS COUNTIES ABOVE 6000 FEET/GILPIN/CLEAR
CREEK/NORTHEAST PARK COUNTIES BELOW 9000 FEET-
INCLUDING...BAILEY...CENTRAL CITY...EVERGREEN...GEORGETOWN...
IDAHO SPRINGS...WESTCREEK
256 PM MST SUN JAN 21 2007

...SNOW AND BLOWING SNOW ADVISORY NOW IN EFFECT UNTIL 6 PM MST
THIS AFTERNOON...

THE SNOW AND BLOWING SNOW ADVISORY IS NOW IN EFFECT UNTIL 6 PM
MST THIS AFTERNOON. 

LIGHT SNOW WILL CONTINUE THROUGH THE REMAINDER OF THE AFTERNOON
BUT DECREASE THIS EVENING. ADDITIONAL ACCUMULATION OF 1 TO 3
INCHES ARE POSSIBLE.

NORTHERLY WINDS FROM 15 TO 25 MPH WILL OCCUR WITH GUSTS AS HIGH
AS 35 MPH WILL CAUSING AREAS OF BLOWING AND DRIFTING SNOW IN OPEN
AREAS. 

A SNOW AND BLOWING SNOW ADVISORY MEANS THAT VISIBILITIES WILL BE
LIMITED DUE TO A COMBINATION OF FALLING AND BLOWING SNOW. ICY OR
SNOW PACKED ROADS AND DRIFTING SNOW CAN BE EXPECTED. USE CAUTION
WHEN TRAVELING...ESPECIALLY IN OPEN AREAS.

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 20, 10:57 PM MSTSnow and Blowing Snow AdvisoryBOUAdams, Arapahoe, Boulder, Broomfield, Clear Creek, Denver and 16 more19 hr

Nearby

Blizzard Warnings in Colorado, 2007Every blizzard warning in 2007

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.