Alert archive / Colorado / Winter Storm Warnings in 2016

Winter Storm Warning 20, NWS Grand Junction, CO

December 21, 201613 counties in Colorado; Grand County, San Juan County, Utah

NWS Grand Junction, CO issued this winter storm warning at Dec 21, 2016, 3:13 PM MST for 13 counties in Colorado; Grand County, San Juan County, Utah. It took effect at Dec 22, 2016, 5:00 AM MST. It was in force for 27 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Dec 21, 2016, 3:13 PM MST (22:13 UTC)
In effect from
Dec 22, 2016, 5:00 AM MST
Expired
Dec 23, 2016, 8:00 AM MST
In force
27 hr
Issued by
NWS Grand Junction, CO

Counties Archuleta County, CO, Delta County, CO, Dolores County, CO, Garfield County, CO, Gunnison County, CO, Hinsdale County, CO, La Plata County, CO, Mesa County, CO, Montezuma County, CO, Montrose County, CO, Ouray County, CO, San Juan County, CO, San Miguel County, CO, Grand County, UT, San Juan County, UT

The radar

The Grand Junction radar (KGJX), 100 km from the middle of the area, began a volume at 22:16 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

Albuquerq/Krtlnd, NM (KABQ), launched 12:00Z, 10.2 hours before the alert went out and 373 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, Albuquerq/Krtlnd, NM at 12:00Z on 2016-12-21Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Albuquerq/Krtlnd, NM at 12:00Z on 2016-12-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -33 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2666 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
-33 m²/s²
0-3 km storm-relative helicity
-13 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 winter storm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Grand Junction, CO wrote its last area forecast discussion before this winter storm warning went out at Dec 21, 11:03 AM MST, 4 hours 10 minutes earlier.

Area forecast discussion, Dec 21, 11:03 AM MST, 4 hours 10 minutes before
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Hazardous weather outlook, Dec 21, 5:42 AM MST, 9 hours 31 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
542 AM MST WED DEC 21 2016

COZ001>014-017>023-UTZ022>025-027>029-221300-
LOWER YAMPA RIVER BASIN-CENTRAL YAMPA RIVER BASIN-
ROAN AND TAVAPUTS PLATEAUS-ELKHEAD AND PARK MOUNTAINS-
UPPER YAMPA RIVER BASIN-GRAND VALLEY-DEBEQUE TO SILT CORRIDOR-
CENTRAL COLORADO RIVER BASIN-GRAND AND BATTLEMENT MESAS-
GORE AND ELK MOUNTAINS/CENTRAL MOUNTAIN VALLEYS-
CENTRAL GUNNISON AND UNCOMPAHGRE RIVER BASIN-
WEST ELK AND SAWATCH MOUNTAINS-FLAT TOPS-
UPPER GUNNISON RIVER VALLEY-UNCOMPAHGRE PLATEAU AND DALLAS DIVIDE-
NORTHWEST SAN JUAN MOUNTAINS-SOUTHWEST SAN JUAN MOUNTAINS-
PARADOX VALLEY/LOWER DOLORES RIVER-
FOUR CORNERS/UPPER DOLORES RIVER-ANIMAS RIVER BASIN-
SAN JUAN RIVER BASIN-SOUTHEAST UTAH-EASTERN UINTA MOUNTAINS-
EASTERN UINTA BASIN-TAVAPUTS PLATEAU-ARCHES/GRAND FLAT-
LA SAL AND ABAJO MOUNTAINS-CANYONLANDS/NATURAL BRIDGES-
542 AM MST WED DEC 21 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN
COLORADO.

.DAY ONE...TODAY AND TONIGHT

A WEAK WAVE WILL MOVE OVER NORTHERN PORTIONS OF UTAH AND COLORADO
TODAY. AS IT DOES...LIGHT SNOW IS EXPECTED WITH MINIMAL
ACCUMULATIONS...MAYBE 2 TO 3 INCHES IN THE NORTHERN MOUNTAINS.
REMAINING AREAS WILL SEE TIMES OF CLOUDS AND SUN.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

A CLOSED LOW WILL BECOME AN OPEN WAVE THURSDAY AND BRING SNOWFALL
TO THE SAN JUAN MOUNTAINS AND POSSIBLY SOME SNOW OR A RAIN SNOW
MIX TO THE SOUTHERN VALLEYS THROUGH FRIDAY MORNING.

THE NEXT CHANCE FOR PRECIPITATION WILL BE CHRISTMAS EVE NIGHT INTO
CHRISTMAS MORNING AS A STRONG COLD FRONT MOVES OVER THE REGION
BRINGING WIDESPREAD RAIN AND SNOWFALL. PRECIPITATION WILL BE OVER
LATE SUNDAY NIGHT WITH ANOTHER DISTURBANCE EXPECTED TO MOVE OVER
THE AREA TUESDAY NIGHT INTO WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

The office that day

Everything else NWS Grand Junction, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 21, 3:13 PM MSTWinter Weather AdvisoryGJTArchuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 10 more41 hr

Nearby

Winter Storm Warnings in Colorado, 2016Winter Storm Warnings in Utah, 2016Every winter storm warning in 2016

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.