Alert archive / Colorado / Blizzard Watches in 2011

Blizzard Watch 1, NWS Grand Junction, CO

February 15, 201113 counties in Colorado; Grand County, San Juan County, Utah

NWS Grand Junction, CO issued this blizzard watch at Feb 15, 2011, 2:59 PM MST for 13 counties in Colorado; Grand County, San Juan County, Utah. It took effect at Feb 17, 2011, 12:00 AM MST. It was in force for .

The area

The counties it named.

The facts

Issued
Feb 15, 2011, 2:59 PM MST (21:59 UTC)
In effect from
Feb 17, 2011, 12:00 AM MST
Expired
Feb 16, 2011, 5:12 AM MST
In force
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 22:02 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

Grand Junction, CO (KGJT), launched 12:00Z, 10.0 hours before the alert went out and 112 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, Grand Junction, CO at 12:00Z on 2011-02-15Temperature 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, Grand Junction, CO at 12:00Z on 2011-02-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 square meters per square second.1939587897117Sfc1 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
2183 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
100 m²/s²
0-3 km storm-relative helicity
186 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 blizzard watch 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 blizzard watch went out at Feb 15, 4:43 AM MST, 10 hours 16 minutes earlier.

Area forecast discussion, Feb 15, 4:43 AM MST, 10 hours 16 minutes before
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Hazardous weather outlook, Feb 15, 5:45 AM MST, 9 hours 14 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
545 AM MST TUE FEB 15 2011

COZ001>014-017>023-UTZ022>025-027>029-161300-
ANIMAS RIVER BASIN-ARCHES/GRAND FLAT-CANYONLANDS/NATURAL BRIDGES-
CENTRAL COLORADO RIVER BASIN-
CENTRAL GUNNISON AND UNCOMPAHGRE RIVER BASIN-
CENTRAL YAMPA RIVER BASIN-DEBEQUE TO SILT CORRIDOR-
EASTERN UINTA BASIN-EASTERN UINTA MOUNTAINS-
ELKHEAD AND PARK MOUNTAINS-FLAT TOPS-
FOUR CORNERS/UPPER DOLORES RIVER-
GORE AND ELK MOUNTAINS/CENTRAL MOUNTAINS-GRAND AND BATTLEMENT MESAS-
GRAND VALLEY-LA SAL AND ABAJO MOUNTAINS-LOWER YAMPA RIVER BASIN-
NORTHWEST SAN JUAN MOUNTAINS-PARADOX VALLEY/LOWER DOLORES RIVER-
ROAN AND TAVAPUTS PLATEAUS-SAN JUAN RIVER BASIN-SOUTHEAST UTAH-
SOUTHWEST SAN JUAN MOUNTAINS-TAVAPUTS PLATEAU-
UNCOMPAHGRE PLATEAU AND DALLAS DIVIDE-UPPER GUNNISON RIVER VALLEY-
UPPER YAMPA RIVER BASIN-WEST ELK AND SAWATCH MOUNTAINS-
545 AM MST TUE FEB 15 2011

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

.DAY ONE...TODAY AND TONIGHT...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

A SIGNIFICANT WEATHER CHANGE IS EXPECTED WEDNESDAY NIGHT AS A STRONG
COLD FRONT MOVES ACROSS THE REGION HERALDING THE BEGINNING OF
UNSETTLED WEATHER WHICH IS EXPECTED TO LAST THROUGH THE WEEKEND.
MODERATE TO HEAVY SNOW ACCUMULATIONS WILL BE POSSIBLE IN THE
MOUNTAINS...BEGINNING WEDNESDAY NIGHT AND CONTINUING INTO FRIDAY.

SATURDAY THROUGH MONDAY...EXPECT UNSETTLED WEATHER WITH PERIODS OF
SNOW IN THE MOUNTAINS...OCCASIONALLY DRIFTING OVER THE VALLEYS.
COOLER WITH TEMPERATURES BELOW SEASONAL NORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED TODAY AND TONIGHT.

TGJT

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 15, 2:59 PM MSTWinter Storm WatchGJTEagle, Garfield, Moffat, Pitkin, Rio Blanco, Routt14 hr
Feb 15, 3:00 PM MSTHigh Wind WarningGJTArchuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 12 more33 hr

Nearby

Blizzard Watches in Colorado, 2011Blizzard Watches in Utah, 2011Every blizzard watch in 2011

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.