A moist Pacific airmass overriding a cold valley inversion allowed dense fog to develop.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GJT wrote it up.
A moist Pacific airmass overriding a cold valley inversion allowed dense fog to develop.
The local office's own words before the first event, 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 the first event at Jan 19, 3:49 PM MST, 1 hour 11 minutes earlier.
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</html>HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 514 AM MST TUE JAN 19 2010 COZ001>014-017>023-UTZ022>025-027>029-201245- 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- 514 AM MST TUE JAN 19 2010 ...STORMY WEATHER PATTERN TO CONTINUE THROUGH THE WEEK... THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT TRAVEL WILL BE SLOW OR DELAYED ACROSS THE SAN JUAN MOUNTAINS AND ADJACENT FOOTHILLS TODAY AS SNOW CONTINUES THERE...HEAVY AT TIMES. SNOW WILL ALSO IMPEDE TRAVEL ACROSS THE CENTRAL MOUNTAINS AND PORTIONS OF THE INTERSTATE 70 CORRIDOR. LIGHT SNOW WILL PERSIST IN THE EASTERN UINTA BASIN AND SPREAD ACROSS NORTHWEST COLORADO TODAY. A LULL IN THE PRECIPITATION IS EXPECTED TONIGHT. WINTER STORM WARNINGS AND ADVISORIES ARE IN EFFECT FOR PORTIONS OF EASTERN UTAH AND WESTERN COLORADO. GO TO WWW.WEATHER.GOV/GJT FOR DETAILS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY SNOWFALL WILL INCREASE WEDNESDAY WITH A SERIES OF PACIFIC STORMS CONTINUING TO BRING PERIODS OF PRECIPITATION THROUGH THE WEEKEND. SNOW SHOULD FALL IN THE MOUNTAINS EACH DAY RESULTING FOR POOR TRAVEL CONDITIONS OVER THE PASSES. THE HEAVIEST SNOWFALL SHOULD OCCUR ACROSS THE SOUTHERN COLORADO AND UTAH MOUNTAINS. HIGH PRESSURE WILL BRING IMPROVING CONDITIONS SUNDAY AND MONDAY. THE VALLEYS WILL SEE PERIODS OF SNOW THROUGH THE WEEK. PRECIPITATION WILL LESSEN DURING BRIEF PERIODS BETWEEN EACH SYSTEM...AND GRADUALLY DIMINISH SATURDAY THROUGH MONDAY. .SPOTTER INFORMATION STATEMENT SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT...BUT SPOTTERS ARE ENCOURAGED TO REPORT ANY NEW SNOWFALL TO THE NATIONAL WEATHER SERVICE IN GRAND JUNCTION. TGJT
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
1231 PM MST TUE JAN 19 2010
..TIME.. ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE.. ....MAG.... ..COUNTY LOCATION.. ST.. ...SOURCE....
..REMARKS..
0800 AM HEAVY SNOW MESA VERDE NATL PARK 37.15N 108.48W
01/19/2010 M14.0 INCH MONTEZUMA CO CO-OP OBSERVER
&&
EVENT NUMBER GJT1000024
BKPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
1234 PM MST TUE JAN 19 2010
..TIME.. ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE.. ....MAG.... ..COUNTY LOCATION.. ST.. ...SOURCE....
..REMARKS..
0800 AM HEAVY SNOW 5 S DURANGO 37.21N 107.87W
01/19/2010 M8.0 INCH LA PLATA CO TRAINED SPOTTER
&&
EVENT NUMBER GJT1000025
BKPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
1245 PM MST TUE JAN 19 2010
..TIME.. ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE.. ....MAG.... ..COUNTY LOCATION.. ST.. ...SOURCE....
..REMARKS..
0800 AM HEAVY SNOW 2 W PAGOSA SPRINGS 37.27N 107.05W
01/19/2010 M6.4 INCH ARCHULETA CO CO-OP OBSERVER
&&
EVENT NUMBER GJT1000026
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</html>The national radar mosaic for the moment the first event began.
1 dense fog. Local standard time, as filed.
Widespread dense freezing fog formed through the overnight hours creating slick roadways. Visibilities frequently dropped to near or below one-quarter mile.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2010Every state in 2010This day in weather historyWarnings in Utah, January 2010
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 209810.