High winds developed in and near the Front Range Foothills. Peak wind reports included: 88 mph atop Niwot Ridge; 87 mph atop Mines Peak; 80 mph, 3 miles southeast of Jamestown; 78 mph in Longmont; 74 mph at Table Mesa.
Every event with a place to put it; 4 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 BOU wrote it up.
High winds developed in and near the Front Range Foothills. Peak wind reports included: 88 mph atop Niwot Ridge; 87 mph atop Mines Peak; 80 mph, 3 miles southeast of Jamestown; 78 mph in Longmont; 74 mph at Table Mesa. A few power outages occurred in Longmont as broken branches downed power lines.
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 Denver/Boulder, CO wrote its last area forecast discussion before the first event at Dec 3, 2:35 PM MST, 1 hour 25 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER CO 235 PM MST MON DEC 3 2007 .SHORT TERM...MAIN CONCERN THIS TIME AROUND IS THE WIND. THE STRONGEST WINDS HAVE REMAINED CONFINED TO THE HIGHEST AREAS THROUGHOUT THE DAY WITH A FEW GUSTS IN THE 40-50 MPH RANGE IN SOME OF THE FOOTHILL LOCATIONS. TREND OF THE SANGSTER VALUES AND PROFILER WINDS AT PLATTEVILLE OVER THE LAST COUPLE OF HOURS HAS BEEN DOWN. FURTHERMORE...THE NUMERICAL MODEL PREDICTIONS FOR THE OVERNIGHT HOURS SUGGEST THAT NOT MUCH IN THE UPSTREAM CONDITIONS ...EITHER STABILITY OR WIND...IS EXPECTED TO CHANGE DRASTICALLY. IF THIS TURNS OUT TO BE TRUE THEN WE PROBABLY WILL NOT SEE MUCH CHANGE IN THE SURFACE WINDS OVER AND DOWNSTREAM OF THE MOUNTAINS... SUGGESTING THAT HIGH WINDS WILL NOT OCCUR. HAVING SAID THIS HOWEVER CONFIDENCE IS NOT HIGH ENOUGH TO GO EITHER WAY WITH THE HIGH WIND WATCH AND BELIEVE IT IS PRUDENT TO CONTINUE IT AT THIS POINT AND LET THE EVENING SHIFT TAKE A GANDER AT SOME LATER OBSERVED DATA... SPECIFICALLY RAOBS...PROFILER AND SURFACE REPORTS...TO SEE IF ANYTHING MORE CONCRETE PRESENTS ITSELF DURING THE EVENING. ASIDE FROM THE WINDS TONIGHT AND EARLY TUESDAY...TOMORROW SHOULD BE SIMILAR TO TODAY WITH WARM AND DRY CONDITIONS ON THE PLAINS AND JUST A FEW AREAS OF SNOW IN THE HIGHER MOUNTAIN AREAS. .LONG TERM...MODELS HAVE INCREASING WEST-NORTHWESTERLY FLOW ALOFT FOR THE FORECAST AREA TUESDAY NIGHT...WITH A JET MAX PUSHING SOUTHWARD WEDNESDAY MORNING. STRONG WEST-NORTHWESTERLY FLOW ALOFT STAYS OVER THE FORECAST AREA THROUGH THURSDAY...WITH A WEAK UPPER TROUGH PUSHING ACROSS AROUND MID DAY. BEHIND THAT...ANOTHER JET MAX MOVES ACROSS THE NORTHERN FORECAST AREA THURSDAY AFTERNOON INTO THE EVENING. THE QG VERTICAL VELOCITY FIELDS HAVE RATHER BENIGN VERTICAL MOTIONS TUESDAY NIGHT AND WEDNESDAY. WEDNESDAY NIGHT INTO THURSDAY MORNING...UPWARD MOTION IS INDICATED. THE BOUNDARY LAYER FLOW IS DOWNSLOPING NORTHWESTERLY TUESDAY NIGHT WITH THE LOW LEVEL PRESSURE GRADIENT ON THE DECREASE. BY WEDNESDAY AFTERNOON...BOTH MODELS HAVE SOME WEAK UPSLOPE FLOW INDICATED WHICH IS MARGINALLY AROUND THROUGH THURSDAY NIGHT. ITS PRETTY WEAK AND IT LOOKS A BIT BETTER ON THE NAM. FOR MOISTURE...THERE IS SOME IN THE LOWER AND MID LEVELS IN THE MOUNTAINS TUESDAY NIGHT. THIS CONTINUES ON WEDNESDAY. BY WEDNESDAY AFTERNOON...MOISTURE STARTS INCREASING OVER THE PLAINS. WEDNESDAY NIGHT INTO THURSDAY MORNING THE NAM HAS DEEPER MOISTURE FOR ALL PARTS OF THE FORECAST AREA. BY THURSDAY AFTERNOON...THE GFS HAS EXTREMELY DEEP MOISTURE OVER ALL THE FORECAST AREA...THE NAM SHOWS CONSIDERABLY LESS. THE QPF GRIDS SHOW VERY LIMITED PRECIPITATION IN THE MOUNTAINS TUESDAY NIGHT AND WEDNESDAY. THE GFS MORE HEAVY HANDED. BY WEDNESDAY NIGHT CONTINUING THURSDAY...THE NAM HAS MINOR AMOUNTS FOR MUCH OF THE FORECAST AREA. THE GFS DOESNT SHOW THIS COVERAGE UNTIL THURSDAY NIGHT INTO EARLY FRIDAY. OVERALL THE DETAILS BETWEEN THE MODELS ARE NOT IN VERY GOOD AGREEMENT. FOR POPS IN THE MOUNTAINS...THERE IS ENOUGH MOISTURE AND OROGRAPHIC ENHANCEMENT TUESDAY NIGHT INTO WEDNESDAY TO UP CURRENT GOING POP GRIDS A BIT...ESPECIALLY WITH A JET MAX IN THE VICINITY. HOWEVER THERE ISNT ANY SIGNIFICANT COOLING PROGGED. BY LATER WEDNESDAY AND WEDNESDAY NIGHT...THE MOUNTAIN TOP WIND DIRECTION BECOMES 240-250 DEGREES...NOT THE BEST FOR HELPING OROGRAPHICS FOR OUR MOUNTAINS. HOWEVER THERE IS STILL MOISTURE...SYNOPTIC SCALE LIFT...AND STRONG FLOW ALOFT. THERE IS SOME COOLING WEDNESDAY NIGHT AS WELL. WILL LET THE 30-40% POPS RIDE IN THE MOUNTAINS THROUGH FRIDAY ANYWAY. FOR THE PLAINS...MAY UP THURSDAYS POPS A BIT. THE UPSLOPE IS MARGINAL AND WEAK...THE MODELS DISAGREE ON TIMING AND AMOUNT OF MOISTURE...THERE IS A JET AROUND...BUT IT COMES AFTER THE BEST SYNOPTIC SCALE ASCENT. NO HIGHLIGHTS FOR SURE AT THIS TIME. FOR TEMPERATURES... WEDNESDAYS HIGHS ARE NOT AS COOL AS YESTERDAYS MODEL RUNS INDICATED. THEY ARE 1.5-3.0 C COOLER THAN TUESDAYS. THURSDAYS COOL OFF SOME 4.0-6.0 C FROM WEDNESDAYS. FOR THE LATER DAYS...FRIDAY THROUGH MONDAY...THE VARIOUS MODELS NOW SHOW THE WESTERN U.S. TROUGH FOR THE WEEKEND LOOKING A BIT MORE CONDUCIVE TO BRING PRECIPITATION TO THE FORECAST AREA. THE GFS NEVER DRAGS THE UPPER FEATURE ACROSS US AND KEEPS THE FORECAST AREA IN PERPETUAL SOUTHWESTERLY FLOW ALOFT. THE ECMWF MOVES IT EASTWARD SUNDAY NIGHT INTO MONDAY. IF THE GFS COMES TRUE THE PLAINS COULD SEE SOME PRECIPITATION SATURDAY NIGHT/SUNDAY MORNING AND AGAIN MONDAY NIGHT. IN THE MOUNTAINS...THERE IS TONS OF MOISTURE ON THE GFS FRIDAY AND FRIDAY NIGHT AND AGAIN FROM SUNDAY THROUGH MONDAY NIGHT. WHO KNOWS? WILL LEAVE THE PLAINS DRY THIS UPDATE AND KEEP SOMETHING IN THE MOUNTAINS THROUGHOUT. && .AVIATION...VFR CONDITIONS ARE EXPECTED TONIGHT AND TUESDAY. WINDS WILL BE RATHER ERRATIC WITH MOUNTAIN WAVE AND ROTOR ACTIVITY CONTINUING THROUGH TUESDAY AS STRONG WEST NORTHWEST FLOW ALOFT PERSISTS. && .BOU WATCHES/WARNINGS/ADVISORIES...HIGH WIND WATCH TONIGHT AT MIDNIGHT THROUGH TUESDAY NOON FOR ZONES 33..34..35..36. && ET/RJK
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER CO 1105 AM MST MON DEC 03 2007 COZ030>051-041300- 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- 1105 AM MST MON DEC 03 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT WINDY CONDITIONS WILL CONTINUE IN THE HIGH COUNTRY THROUGH TONIGHT WITH OCCASIONAL WIND GUSTS TO AROUND 70 MPH OR SO...MAINLY ABOVE TIMBERLINE. THESE WINDS WILL CAUSE AREAS OF BLOWING SNOW IN THE PASSES WHICH WILL REDUCE VISIBILITIES AT TIMES. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY GUSTY WEST WINDS WILL CONTINUE IN THE FOOTHILLS AND MOUNTAINS ON TUESDAY. THERE IS THE POTENTIAL FOR SOME HIGH WINDS TUESDAY MORNING IN AND NEAR THE FOOTHILLS. MOISTURE WILL RETURN TO THE FORECAST AREA TUESDAY NIGHT AND CONTINUE THROUGH MUCH OF THE WEEK. THIS MOISTURE ALONG WITH AN UPPER LEVEL TROUGH WILL BRING A CHANCE OF PRECIPITATION TO MUCH OF THE FORECAST AREA...ESPECIALLY OVER THE HIGH COUNTRY MID TO LATE WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT. ET/RJK
The national radar mosaic for the moment the first event began.
4 high wind. Local standard time, as filed.
A peak wind gust to 78 mph occurred in north Longmont, with a gust to 72 mph recorded in downtown Longmont. a few brief power outages were also reported.
A peak wind gust to 78 mph occurred in north Longmont, with a gust to 72 mph recorded in downtown Longmont. a few brief power outages were also reported.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2007Every state in 2007This day in weather historyWarnings in Colorado, December 2007
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: 63742, 68835, 68856, 63743.