Residual low level moisture from a previous storm and cold overnight temperatures caused dense fog to form in some lower elevation areas of southeast Utah.
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The episode as NWS GJT wrote it up.
Residual low level moisture from a previous storm and cold overnight temperatures caused dense fog to form in some lower elevation areas of southeast Utah.
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 Dec 4, 9:47 PM MST, 1 hour 43 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 947 PM MST THU DEC 4 2014 .UPDATE... ISSUED AT 945 PM MST THU DEC 4 2014 TODAY'S STORM WAS MOVING INTO THE SOUTHERN PLAINS THIS EVENING...BUT A TRAILING WEAK DISTURBANCE CROSSING UT WILL KEEP A FEW RAIN/SNOW SHOWERS AROUND OVERNIGHT. LINEAR INTERPOLATION FROM SATELLITE LOOP HAS THIS WEAK DISTURBANCE PASSING WRN CO AROUND 500 AM. SOME FOG HAS BEEN OBSERVED BY THE DURANGO AND PAGOSA SPGS ASOS SITES. CHANCE OF FOG SHOULD INCREASE LATER TONIGHT IN THOSE AREAS THAT RECEIVED WETTING PRECIPITATION AS SKIES CLEAR WITH THIS PASSING WAVE. CURRENT FORECAST HAS THIS HANDLED. WILL KEEP A WATCH FOR THE DEVELOPMENT OF FOG OVERNIGHT. && .SHORT TERM...(TONIGHT THROUGH FRIDAY NIGHT) ISSUED AT 334 PM MST THU DEC 4 2014 IMPRESSIVE CLOUD SHIELD IN SATELLITE IMAGERY OVER THE 4 CORNER REGION TODAY AS A SYSTEM PASSES THROUGH THE SOUTHERN ROCKIES. THE BULK OF THE PRECIPITATION HAS BEEN LOCATED TO OUR SOUTH THOUGH SOME OF OUR SOUTHEAST VALLEYS DID WELL...NEAR A QUARTER OF AN INCH OF RAINFALL. UNFORTUNATELY THE COLD AIR IS NOT ACCOMPANYING THIS STORM AND THE BULK OF WX SENSORS UNDER 10000 FEET ARE WELL ABOVE ZERO. THIS PROBABLY RELATED TO THE STRONG MOISTURE ADVECTION...WITH PWATS 200 PERCENT OF NORMAL...KEEPING THE ASCENT FROM DRASTICALLY COOLING THE MID LAYERS. SNOW ACCUMULATION WAS LIKELY IN THE HIGH PEAKS ACROSS THE CENTRAL SAN JUANS BUT LITTLE IMPACT TO THE ROADWAYS HAS BEEN NOTED IN REPORTS AND WEBCAMS. SATELLITE IMAGERY AND RADAR MOSAIC IS HINTING THAT THE MAIN FORCING IS SHIFTING EAST OF THE DIVIDE LATE THIS AFTERNOON...DIMINISHING THE THREAT OF SIGNIFICANT PRECIPITATION OVER OUR CWA. THEREFORE CANCELLED THE ADVISORY IN PLACE FOR THE SOUTHERN SAN JUANS...EARLY. THERE WILL STILL BE A CONVECTIVE ELEMENT WORKING THROUGH ON THE BACK SIDE OF THIS STORM WITH PLENTY OF MOISTURE STILL IN PLACE. A WEAK UPSTREAM WAVE LOOKS JUST STRONG ENOUGH TO KEEP SOME ISOLATED SHOWERS IN ACROSS THE CENTRAL AND NORTHERN CWA LATE THROUGH THE OVERNIGHT HOURS...WITH DRYING IN THE MID LEVELS ADDING SOME INSTABILITY. AS THIS DRIER AIR WORKS IN ALOFT...SATURATED AREAS OF THE SOUTH COULD PRODUCE FOG AS WELL. AN TRANSITORY RIDGE WORKS THROUGH THE CWA TOMORROW AND TOMORROW NIGHT AND WILL CONTINUE TO DRY OUT THE DENDRITIC LAYER. MODELS STILL WANT TO PRODUCE SOME LIGHT QPF BUT AM BETTING THIS WILL BE MAINLY JUST RESIDUAL CLOUD COVER. WAA AHEAD OF THE NEXT APPROACHING SYSTEM WILL PUSH HIGH CLOUDINESS BACK IN FRIDAY NIGHT BUT PRECIPITATION SHOULD BE HELD AT BAY UNTIL AFTER SUNRISE ON SATURDAY. OVERALL TEMPERATURES WILL REMAIN ABOVE NORMAL. .LONG TERM...(SATURDAY THROUGH THURSDAY) ISSUED AT 334 PM MST THU DEC 4 2014 THOUGH EARLY SATURDAY MORNING IS EXPECTED TO START OUT DRY...A DISTURBANCE MOVES INTO EASTERN UTAH BY NOON PULLING SOME MOISTURE INTO THE REGION. THE DISTURBANCE WILL MOVE EAST THROUGHOUT THE DAY ON SATURDAY...AND SNOW LEVEL IS EXPECTED TO BE AROUND 8000 FT DURING THE DAY. THOUGH PRECIPITATION DOESN/T LOOK SUBSTANTIAL DURING THE DAY...THERE WILL BE A CHANCE ACROSS THE FORECAST AREA FOR MEASURABLE PRECIPITATION WITH THE PASSAGE OF THIS WEATHER DISTURBANCE. A FEW SHOWERS WILL LINGER ACROSS THE CENTRAL AND NORTH CENTRAL COLORADO MTNS SATURDAY NIGHT INTO SUNDAY MORNING. SUB- ADVISORY SNOW AMOUNTS ARE EXPECTED WITH THIS SYSTEM. HIGH PRESSURE MOVES BACK INTO THE FORECAST REGION ON SUNDAY. THE HIGH PRESSURE ISN/T PARTICULARLY STRONG UNTIL WEDNESDAY...WHICH LEAVES SOME ROOM FOR WEAK DISTURBANCES TO PASS THROUGH THE FLOW UNTIL WEDNESDAY. THE LONG TERM MODELS SEEM TO BE WAFFLING BACK AND FORTH WITH SMALL EMBEDDED DISTURBANCES ON MONDAY AND TUESDAY...THOUGH AT THIS POINT WE CAN JUST EXPECT AN INCREASE IN CLOUD COVER AS THESE MINOR CHANGES IN THE FLOW ARE APPEARING IN THE FORECAST MODELS WITH NO PRECIPITATION FORECAST AT THIS TIME. TEMPERATURES WILL REMAIN 5 TO 10 DEGREES ABOVE NORMAL THROUGHOUT THE WEEK. && .AVIATION...(FOR THE 06Z TAFS THROUGH 06Z FRIDAY NIGHT) ISSUED AT 945 PM MST THU DEC 4 2014 A WEAK DISTURBANCE TRAILING TODAY'S STORM COMBINED WITH LINGERING LOW LEVEL WILL KEEP LOCAL -RA/-SN GOING UNTIL 12Z. EXPECT MVFR/IFR CIGS/VSBY WITH MOUNTAIN OBSCURATIONS WHERE THIS OCCURS. TRAPPED LOW LEVEL MOISTURE WILL ALSO LEAD TO PERIODS OF MVFR/IFR CIGS...AND VSBY IN FG/FZFG...AT VALLEY LOCATIONS MAINLY IN SW CO BUT ALSO ANYWHERE THAT HAS WET GROUND WITH CLEARING SKIES THROUGH 15Z FRI. VFR CONDITIONS EXPECTED AT ALL TAF SITES 18Z FRI TO 06Z SAT. && .GJT WATCHES/WARNINGS/ADVISORIES... CO...NONE. UT...NONE. && UPDATE...JAD SHORT TERM...15 LONG TERM...JAM AVIATION...JAD
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
The national radar mosaic for the moment the first event began.
1 dense fog. Local standard time, as filed.
Dense fog occurred across portions of southeast San Juan County as visibilities dropped down to a quarter mile or less.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2014Every state in 2014This day in weather historyWarnings in Utah, December 2014
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 2026-09-24. Each event’s entry at NCEI: 559594.