Alert archive / Colorado / Snow Advisories in 2008

Snow Advisory 10, NWS Denver/Boulder, CO

April 16, 20084 counties in Colorado

NWS Denver/Boulder, CO issued this snow advisory at Apr 16, 2008, 6:45 PM MDT for 4 counties in Colorado. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued
Apr 16, 2008, 6:45 PM MDT (00:45 UTC)
Expired
Apr 17, 2008, 5:11 AM MDT
In force
10 hr
Issued by
NWS Denver/Boulder, CO

Counties Boulder County, CO, Grand County, CO, Jackson County, CO, Larimer County, CO

The radar

The Cheyenne radar (KCYS), 121 km from the middle of the area, began a volume at 00:46 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 00:00Z, 0.8 hours before the alert went out and 227 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 00:00Z on 2008-04-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2008-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 square meters per square second.1939587897Sfc1 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
5 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
545 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
13 m²/s²
0-3 km storm-relative helicity
262 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this snow 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 snow advisory went out at Apr 16, 6:20 PM MDT, 25 minutes earlier.

Area forecast discussion, Apr 16, 6:20 PM MDT, 25 minutes before
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Hazardous weather outlook, Apr 16, 10:52 AM MDT, 7 hours 53 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER CO
1052 AM MDT WED APR 16 2008

COZ030>051-171200-
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-
1052 AM MDT WED APR 16 2008

..WINTER-LIKE STORM WILL AFFECT AREA TONIGHT INTO EARLY THURSDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL
COLORADO.

.DAY ONE...TODAY AND TONIGHT

RAIN MIXED WITH SNOW WILL OCCUR OVER THE OUTLOOK AREA BY LATE
AFTERNOON. PRECIPITATION WILL CHANGE OVER TO ALL SNOW BY THIS
EVENING. THE HIGHEST SNOW AMOUNTS WILL BE IN AND NEAR THE FOOTHILLS
SOUTH AND WEST OF DENVER AND ALONG THE PALMER DIVIDE.

A COLD FRONT PRODUCING UPSLOPE FLOW WILL MOVE SOUTH ACROSS THE
NORTHEAST PLAINS EARLY THIS AFTERNOON. THIS WILL COMBINE WITH A
MOIST PACIFIC TROUGH OF LOW PRESSURE WHICH WILL MOVE OVER THE STATE
TONIGHT THROUGH EARLY THURSDAY.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

SNOW WILL GRADUALLY TAPER OFF FROM NORTH TO SOUTH ACROSS THE AREA
DURING THE MORNING HOURS THURSDAY.  ADDITIONAL SNOW ACCUMULATION OF
1 TO 2 INCHES CAN BE EXPECTED ACROSS THE SOUTHERN FRONT RANGE
FOOTHILLS AND PALMER DIVIDE AREA...BRINGING STORM TOTALS INTO THE
5 TO 10 INCH RANGE WITH AROUND A FOOT OF SNOW EXPECTED IN FAVORED
LOCATIONS AROUND EVERGREEN...CONIFER...AND MONUMENT HILL.
MEANWHILE...THE NORTHERN FRONT RANGE FOOTHILLS...PARK COUNTY...AND
THE FRONT RANGE MOUNTAINS SHOULD SEE AMOUNTS TOTALING 3 TO 8 INCHES.
IN THE FRONT RANGE URBAN CORRIDOR...LOOK FOR STORM TOTALS OF 1 TO 3
INCHES...WITH UP TO 5 INCHES IN THE SOUTHERN AND WESTERN SUBURBS OF
DENVER.  SIMILAR AMOUNTS CAN ALSO BE EXPECTED STRETCHING EASTWARD
ACROSS THE I-70 CORRIDOR TOWARD LIMON.  FINALLY...THE FAR
NORTHEASTERN PLAINS WILL SEE LITTLE IF ANY SNOW ACCUMULATION.

DRY AND WARMER WEATHER WILL PREVAIL FROM FRIDAY THROUGH THE WEEKEND.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.

KTF/ET/BARJENBRUCH

In the hours before

Local storm report, Apr 16, 4:55 PM MDT, 1 hour 50 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
455 PM MDT WED APR 16 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0436 PM     SNOW             2 S BRECKENRIDGE        39.47N 106.04W
04/16/2008  M3.0 INCH        SUMMIT             CO   TRAINED SPOTTER

            HEAVY SNOW. 3 INCHES PER HOUR.

0401 PM     SNOW             3 NNE BAILEY            39.43N 105.44W
04/16/2008  M5.0 INCH        PARK               CO   TRAINED SPOTTER

            TOP OF CROW HILL. SNOW STARTED AT 1 PM.

0344 PM     SNOW             4 ENE CONIFER           39.54N 105.23W
04/16/2008  M3.8 INCH        JEFFERSON          CO   TRAINED SPOTTER

            SINCE 1238 PM.

0341 PM     SNOW             2 ENE BERGEN PARK       39.71N 105.32W
04/16/2008  M3.0 INCH        JEFFERSON          CO   TRAINED SPOTTER

            CHIEF HOSA EXIT I-70. ONE INCH PER HOUR.

&&

CLB
Local storm report, Apr 16, 6:04 PM MDT, 41 minutes before
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Nearby

Snow Advisories in Colorado, 2008Every snow advisory in 2008

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.