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NOUS45 KBOU 060045
PNSBOU
COZ030>051-062300-
PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
645 PM MDT SAT SEP 5 2026
..THIS WEEK IN METRO DENVER WEATHER HISTORY
1-7 IN 1978...THE TEMPERATURE REACHED 90 DEGREES OR MORE ON SEVEN
CONSECUTIVE DAYS WITH THE HIGHEST TEMPERATURE...94 DEGREES...
RECORDED ON BOTH THE 4TH AND 6TH.
1-30 IN 2020...A WORSENING DROUGHT THAT STARTED IN THE SPRING AND
CONTINUED THROUGH SEPTEMBER. OUTSIDE OF AN EARLY SEASON
SNOW ON THE 8TH...THE MONTH OF SEPTEMBER WAS ANOTHER
UNSEASONABLY WARM AND DRY PERIOD. THE COMBINATION
OF HOT...MOSTLY DRY CONDITIONS...AND CRITICALLY DRY FUELS...
RESULTED IN A CONTINUATION AND RAPID EXPANSION OF SEVERAL
MASSIVE WILDFIRES. THE CAMERON PEAK FIRE...WHICH BECAME THE
LARGEST IN THE STATE'S HISTORY STARTED ON AUGUST 13TH...AND
CONTINUED THROUGH SEPTEMBER. AS A RESULT...VERY POOR AIR
QUALITY CONTINUED TO IMPACT DENVER AND THE ENTIRE FRONT
RANGE. DENVER RECORDED THE MOST DAYS EVER WITH A HIGH
TEMPERATURE OF 90 DEGREES OR BETTER; 75 DAYS. THE LAST
OF WHICH WAS 91 DEGREES ON THE 24TH. THE PREVIOUS
RECORD WAS 73 DAYS SET IN 2012.
3-6 IN 1909...RAINFALL FOR THE 4 DAYS ACCUMULATED TO 3.97 INCHES
IN BOULDER...WHILE IN DENVER RAINFALL TOTALED 2.45 INCHES
ON THE 4TH...5TH...AND 6TH.
5-8 IN 2020...A STRONG UPPER LEVEL LOW BROUGHT AN END TO RECORD
HEAT TO THE FRONT RANGE URBAN CORRIDOR...AND PROVIDED DENVER
ITS SECOND EARLIEST MEASURABLE SNOWFALL ON RECORD. NUMEROUS
HEAT RECORDS WERE SET LEADING UP TO THE SNOWFALL...AND
SEVERAL NEW SNOWFALL AND COLD RECORDS WERE ALSO BROKEN IN
THIS ABRUPT BOUT WITH WINTER. DENVER SET ITS ALL TIME
RECORD HIGH FOR SEPTEMBER...REACHING 101 DEGREES DURING THE
AFTERNOON. THIS WAS ALSO THE LATEST DATE A 100 DEGREE
READING HAS EVER BEEN OBSERVED IN DENVER. ANOTHER DAILY
RECORD HIGH WAS THEN TIED ON SEPTEMBER 6TH WHEN DENVER HIT
97 DEGREES. SEPTEMBER 7TH WAS THE LAST DAY OF HEAT WHEN
DENVER'S HIGH TEMPERATURE REACHED 93 DEGREES. THAT TIED
DENVER FOR THE RECORD FOR THE NUMBER OF 90 DEGREE DAYS FOR
A YEAR AT 73...AND WAS ALSO THE WARMEST TEMPERATURE EVER
RECORDED BEFORE A DAY OF MEASURABLE SNOWFALL. BY THE
EVENING OF SEPTEMBER 7TH...A SERIES OF COLD FRONTS
PROGRESSED SOUTHWARD FROM WYOMING INTO COLORADO...
DROPPING THE TEMPERATURE INTO THE LOW 30S BY THE EARLY
MORNING HOURS OF SEPTEMBER 8TH. SNOW DEVELOPED ACROSS
THE FRONT RANGE MOUNTAINS AND FOOTHILLS OVERNIGHT...
WHILE A MIX OF RAIN AND SNOW DEVELOPED ALONG THE I-25
CORRIDOR. A FEW LOCATIONS PICKED UP LIGHT SNOWFALL
ACCUMULATIONS IN THE MORNING. ACCUMULATING SNOW WAS
MOSTLY CONFINED TO THE HIGHER ELEVATIONS MUCH OF THE
DAY...BEFORE SPREADING ACROSS THE PLAINS DURING THE
LATE AFTERNOON AND EVENING. STORM TOTALS RANGED FROM
4 TO 10 INCHES IN THE MOUNTAINS...WITH 3 TO 6 INCHES
NEAR THE FOOTHILLS. A TOTAL OF 5.6 INCHES OF SNOW
WAS MEASURED AT THE NWS BOULDER OFFICE...WHILE AT
DENVER INTERNATIONAL AIRPORT...THE OFFICIAL
MEASUREMENT WAS 1.0 INCH.
5-9 IN 1988...LAYERS OF SMOKE ALOFT FROM LARGE FOREST FIRES IN
YELLOWSTONE NATIONAL PARK COMPLETELY OBLITERATED THE SUN
AT TIMES. AT STAPLETON INTERNATIONAL AIRPORT...SURFACE
VISIBILITY WAS REDUCED AT TIMES TO 5 AND 6 MILES IN SMOKE.
5-13 IN 2010...THE FOURMILE CANYON WILDFIRE...NORTHWEST OF BOULDER...
BROKE OUT ON THE MORNING OF THE 5TH. IT ORIGINATED FROM
AN UNATTENDED FIRE PIT AT A LOCAL RESIDENCE. THE WILDFIRE
QUICKLY CONSUMED 5 1/2 SQUARE MILES OR 3500 ACRES THE
FIRST DAY...AND FORCED THE EVACUATION OF OVER THREE
THOUSAND RESIDENTS. ERRATIC 45-MPH GUSTS SENT THE FIRE IN
TWO DIRECTIONS AT TIMES. VERY DRY WEATHER CONDITIONS
PRECEDED THE FIRE. THE COMBINATION OF STRONG WINDS...LOW
RELATIVE HUMIDITIES AND DRY FUELS ALLOWED THE WILDFIRE
SPREAD RAPIDLY THROUGH THE STEEP...HEAVILY FORESTED TERRAIN.
THE FLAMES WERE REPORTEDLY 20 TO 50 FEET IN LENGTH. TOWNS
WITHIN THE BURN AREA INCLUDED SALINA...WALLSTREET AND GOLD
HILL. THE DRY CONDITIONS COUPLED WITH GUSTY WINDS RANGING
FROM 45 TO 64 MPH PERSISTED FOR SEVERAL MORE DAYS. FIRE
MANAGERS USED AS MANY AS 700 FIREFIGHTERS AND SUPPORT
PERSONNEL FROM 35 AGENCIES AND SEVEN AIR TANKERS TO BATTLE
THE WILDFIRE. A TOTAL OF 6181 SQUARE ACRES OR
APPROXIMATELY 10 SQUARE MILES WERE BURNED. THE FOURMILE
CANYON WILDFIRE WAS THE MOST DESTRUCTIVE FIRE IN COLORADO
HISTORY IN TERMS OF THE DAMAGE TO PERSONAL PROPERTY. IT
DESTROYED 171 HOMES WITH AN ESTIMATED COST OF 217 MILLION
DOLLARS.
6 IN 1940...A THUNDERSTORM PELTED THE CITY WITH SMALL HAIL.
THE STORM PRODUCED SOME LIGHTNING DAMAGE. ONE WOMAN WAS
STUNNED BY A BOLT WHICH STRUCK NEAR HER. HEAVY RAIN FROM
THE STORM RAISED THE LEVEL OF CHERRY CREEK BY MORE THAN
3 FEET DURING THE HEIGHT OF THE STORM. RAINFALL DOWNTOWN
WAS ONLY 0.26 INCH.
IN 1988...STRONG WINDS BLEW DOWN TWO HOUSES THAT WERE UNDER
CONSTRUCTION IN CASTLE ROCK. NORTHWEST WINDS GUSTED TO 44
MPH AT STAPLETON INTERNATIONAL AIRPORT.
IN 1993...A MAN WAS STRUCK AND KILLED BY LIGHTNING WHILE
STANDING OUTSIDE HIS HOME IN UNINCORPORATED ARAPAHOE COUNTY
11 MILES SOUTH OF DENVER. LIGHTNING ALSO STRUCK A CABIN IN
MARSHDALE...20 MILES SOUTHWEST OF DENVER...WHICH STARTED A
FIRE AND DAMAGED ONE ROOM AND A PORTION OF THE ROOF.
IN 1995...HAIL AS LARGE AS 3/4 INCH IN DIAMETER FELL IN COAL
CREEK CANYON IN NORTHERN JEFFERSON COUNTY.
IN 2001...A THUNDERSTORM DROPPED 3/4 INCH DIAMETER HAIL IN
AURORA NEAR CHERRY CREEK.
7 IN 1875...THE CREEKS WERE RUNNING DANGEROUSLY HIGH DURING
THE NIGHT FROM HEAVY RAINS IN THE MOUNTAINS.
IN 1885...A THUNDERSTORM PRODUCED VERY WHITE HAIL OF IRREGULAR
SHAPE AND ABOUT THE SIZE OF BEANS. PRECIPITATION WAS
ONLY 0.10 INCH.
IN 1971...A VIGOROUS COLD FRONT ACCOMPANIED BY A THUNDERSTORM
PRODUCED WIND GUSTS TO 48 MPH AT STAPLETON INTERNATIONAL
AIRPORT AND MUCH UPSLOPE CLOUDINESS AND LIGHT RAIN ACROSS
METRO DENVER.
IN 1989...WIDESPREAD THUNDERSTORMS PRODUCED LIGHTNING STRIKES
THAT KNOCKED OUT POWER TO ABOUT 13 THOUSAND HOMES IN BOULDER
COUNTY. IN A RUGGED AREA STRIPPED OF VEGETATION BY A FOREST
FIRE EARLIER IN JULY...HEAVY RAIN TRIGGERED MUD SLIDES THAT
DESTROYED ONE HOME AND SEVERELY DAMAGED ANOTHER IN BOULDER
CANYON 10 MILES WEST OF BOULDER. IN ONE HOME...THE MUD
CAVED IN AN EXTERIOR WALL AND POURED INTO THE RESIDENCE
ONLY SECONDS AFTER 2 PEOPLE HAD EVACUATED THE PREMISES.
RAINFALL TOTALED 1 TO 3 INCHES. HAIL 1 3/4 INCHES IN
DIAMETER FELL IN NEDERLAND...IDAHO SPRINGS...AND GOLDEN
GATE CANYON. HAIL 1 INCH IN DIAMETER WAS MEASURED 10
MILES NORTH OF GOLDEN.
IN 1993...THUNDERSTORM WINDS TOPPLED AN OVERHEAD SIGN ONTO
THE INTERSECTION OF I-70 AND I-25 IN DENVER...CAUSING
CONSIDERABLE DAMAGE TO 4 VEHICLES. THE WINDS ALSO CAUSED
A POLICE CAR TO BE BLOWN OFF THE ROAD NORTHEAST OF DENVER.
THUNDERSTORM WINDS GUSTING TO 66 MPH DAMAGED THE SIDING OF
A RESIDENCE SOUTHEAST OF BRIGHTON. A THUNDERSTORM WIND
GUST TO 53 MPH WAS RECORDED AT STAPLETON INTERNATIONAL
AIRPORT. HAIL TO 7/8 INCH IN DIAMETER FELL AT KITTREDGE
IN THE FOOTHILLS OF JEFFERSON COUNTY.
IN 1994...LIGHTNING SEVERELY DAMAGED A PUBLIC TELEVISION
TRANSMITTER ATOP SQUAW MOUNTAIN WEST OF DENVER.
7-8 IN 1884...A WINDSTORM FROM MID-AFTERNOON UNTIL THE EARLY
MORNING HOURS OF THE 8TH PRODUCED SOUTH WINDS SUSTAINED
TO 48 MPH. THE STRONG WINDS TOPPLED SEVERAL TREES IN
THE CITY.
IN 1892...THERE WAS A TRACE OF RAINFALL EACH DAY. THIS
TOGETHER WITH A TRACE OF RAIN ON BOTH THE 2ND AND 3RD WAS
THE ONLY RAINFALL OF THE MONTH...MAKING THE MONTH THE DRIEST
ON RECORD. THE RECORD WAS EQUALED IN 1944.
8 IN 1886...THE LAST THUNDERSTORM OF THE SEASON PELTED THE
CITY WITH HAIL THE SIZE OF BEANS AND DROPPED 0.81 INCH OF
PRECIPITATION.
IN 1962...THE EARLIEST FIRST FREEZE OF THE SEASON OCCURRED.
THE TEMPERATURE DIPPED TO A LOW OF 31 DEGREES.
IN 1973...HAIL UP TO 1 1/2 INCHES IN DIAMETER FELL NORTHEAST
OF BOULDER. A TORNADO WAS REPORTED BY A PILOT EAST OF
PARKER. NO DAMAGE WAS REPORTED.
9 IN 1933...HEAVY RAIN IN THE FOOTHILLS OVER THE CLEAR CREEK
AND GOLDEN GATE CANYON WATERSHEDS CAUSED FLOODING IN
GOLDEN AND DAMAGED THE ROADWAY IN GOLDEN GATE CANYON...
WHICH RESULTED IN ITS CLOSURE.
IN 1969...A FUNNEL CLOUD WAS SIGHTED IN SOUTHEAST DENVER.
THERE WAS ALSO CONSIDERABLE THUNDERSTORM ACTIVITY AND
LOCAL HEAVY RAIN ACROSS METRO DENVER. RAINFALL TOTALED
1.30 INCHES AT STAPLETON INTERNATIONAL AIRPORT WHERE SMALL
HAIL ALSO FELL.
IN 1973...HAIL FROM 3/4 INCH TO 1 3/4 INCHES IN DIAMETER FELL
IN WESTMINSTER AND SOUTH OF BROOMFIELD.
IN 2009...A MAN WAS CRITICALLY INJURED WHEN HE WAS STRUCK BY
LIGHTNING WHILE RIDING HIS BICYCLE. HE WAS NEARING A
PARAMEDIC VAN WHEN HE WAS HIT. HIS HEART STOPPED BUT
PARAMEDICS QUICKLY RESPONDED AND WERE ABLE TO RESUSCITATE
HIM.
IN 2011...A MAN WAS STRUCK BY LIGHTNING AT THE ADAMS COUNTY
FAIRGROUNDS. HE WAS LEANING AGAINST A TREE WHILE WATCHING
A CROSS COUNTRY MEET WHEN THE TREE WAS HIT. THE LIGHTNING
TRAVELED DOWN THE TREE AND UP THROUGH THE GROUND...USING
HIM AS A CONDUCTOR. THE VICTIM RECEIVED SECOND AND THIRD
DEGREE BURNS.
9-10 IN 1933...HEAVY RAIN OVER THE CHERRY CREEK...PLUM CREEK...BIG
DRY CREEK...AND LITTLE DRY CREEK WATERSHEDS CAUSED FLOODING
ON THE SOUTH PLATTE RIVER IN DENVER OVERNIGHT. NEARLY AN
INCH OF RAIN...0.98 INCH...FELL IN THE CITY.
IN 1944...A TRACE OF RAIN FELL ON EACH DAY. THIS TOGETHER
WITH A TRACE OF RAIN ON THE 4TH AND 30TH WAS THE ONLY
PRECIPITATION FOR THE MONTH. THE TOTAL OF A TRACE OF
PRECIPITATION FOR THE MONTH EQUALED THE DRIEST SEPTEMBER
ON RECORD FIRST SET IN 1892.
IN 1994...UNUSUALLY VERY WARM WEATHER RESULTED IN THREE
TEMPERATURE RECORDS BEING EQUALED. HIGH TEMPERATURES
OF 94 DEGREES ON THE 9TH AND 93 DEGREES ON THE 10TH
EQUALED RECORD MAXIMUMS FOR THE DATES. LOW TEMPERATURE
OF 63 DEGREES ON THE 9TH EQUALED THE RECORD HIGH MINIMUM
FOR THE DATE.
10 IN 1985...GOLF BALL SIZE HAIL WAS REPORTED JUST EAST OF PARKER.
IN 1989...3/4 INCH DIAMETER HAIL FELL IN LITTLETON. HEAVY RAIN
PRODUCED LOCAL FLOODING IN LAKEWOOD. THE HEAVY RAIN CAUSED
THE WALL OF A HOUSE TO COLLAPSE.
IN 1993...THUNDERSTORM WINDS DOWNED POWER LINES...WHICH CAUSED A
POWER OUTAGE IN CASTLE ROCK.
10-17 IN 2018...THE HIGH TEMPERATURE EQUALLED OR EXCEEDED 90 DEGREES FOR
8 CONSECUTIVE DAYS; BREAKING THE PREVIOUS STREAK OF 7 CONSECUTIVE
DAYS IN THE MONTH OF SEPTEMBER.
10-18 IN 2018...THE HIGH TEMPERATURE EQUALLED OR EXCEEDED 90 DEGREES FOR 9
CONSECUTIVE DAYS; MARKING THE FIRST TIME SUCH AN OCCURRENCE HAS
TAKEN PLACE IN THE MONTH OF SEPTEMBER. IT ALSO BROUGHT SEPTEMBER
OF 2018 INTO A 4-WAY TIE FOR MOST 90 DEGREE + DAYS IN THE MONTH.
PREVIOUS YEARS INCLUDED 2017...2005 AND 1895. DURING THE STREAK...4
RECORD HIGH TEMPERATURES WERE EITHER TIED OR BROKEN...AND ONE
RECORD HIGH MINUMUM TEMPERATURES WAS BROKEN.
11 IN 1910...WEST WINDS WERE SUSTAINED TO 42 MPH.
IN 1951...A VIGOROUS CANADIAN COLD FRONT PRODUCED A DUST STORM
ACROSS METRO DENVER. NORTHEAST WIND GUSTS TO 43 MPH REDUCED
THE VISIBILITY AT STAPLETON AIRPORT TO AS LOW AS 1 1/2 MILES
FOR NEARLY 5 HOURS. THE TEMPERATURE DROPPED 47 DEGREES IN
8 HOURS...FROM A HIGH OF 92 DEGREES TO A LOW OF 45 DEGREES.
IN 1967...A MICROBURST WIND GUST TO 52 MPH PRODUCED BLOWING
DUST AND BRIEFLY REDUCED THE VISIBILITY TO 1/2 MILE AT
STAPLETON INTERNATIONAL AIRPORT.
IN 1974...A TRACE OF SNOW...THE FIRST OF THE SEASON...ENDED
THE SHORTEST PERIOD WITHOUT SNOW...94 DAYS FROM JUNE 9TH
THROUGH SEPTEMBER 10TH. A TRACE OF SNOW ALSO FELL ON
JUNE 8TH.
IN 1995...STRONG POST-FRONTAL WINDS ASSOCIATED WITH A FAST
MOVING PACIFIC COLD FRONT KNOCKED DOWN POWER POLES AND TREES
AS IT MOVED THROUGH METRO DENVER. NUMEROUS POWER OUTAGES
AFFECTED NEARLY ONE THOUSAND PEOPLE IN DENVER AND JEFFERSON
COUNTIES. WEST WINDS GUSTED TO 34 MPH AT DENVER
INTERNATIONAL AIRPORT.
11-16 IN 2013...A DEEP SOUTHERLY FLOW OVER COLORADO...AHEAD OF A
NEARLY STATIONARY LOW PRESSURE SYSTEM OVER THE GREAT BASIN...
PUMPED COPIOUS AMOUNTS OF MONSOONAL MOISTURE INTO THE AREA.
IN ADDITION...A WEAK STATIONARY FRONT STRETCHED ALONG THE
FRONT RANGE FOOTHILLS AND PALMER DIVIDE. THIS RESULTED IN
A PROLONGED PERIOD OF MODERATE TO HEAVY RAIN ACROSS THE
FRONT RANGE FOOTHILLS...PALMER DIVIDE...URBAN CORRIDOR. BY
THE 14TH...STORM TOTALS RANGED FROM 6 TO 18 INCHES...HIGHEST
IN THE FOOTHILLS OF BOULDER COUNTY. THE HEADWATERS THEN
MOVED DOWN THE SOUTH PLATTE RIVER AND CAUSED WIDESPREAD
FLOODING WITH RECORD FLOOD STAGES AT SEVERAL LOCATIONS AS
IT MADE ITS WAY DOWNSTREAM. THE RECORD HIGH FLOOD STAGES
RESULTED IN WIDESPREAD FLOODING ALONG THE SOUTH
PLATTE RIVER BASIN. THE FLOOD DAMAGE ENCOMPASSED 4500
SQUARE MILES OF THE FRONT RANGE...LEFT 7 DEAD...FORCED
THOUSANDS TO EVACUATE...AND DESTROYED THOUSANDS OF HOMES
AND FARMS. RECORD AMOUNTS OF RAINFALL GENERATED FLASH
FLOODS THAT TORE UP ROADS AND LINES OF COMMUNICATION...
LEAVING MANY STRANDED. NEARLY 19000 HOMES WERE DAMAGED...
AND OVER 1500 DESTROYED. COLORADO DEPARTMENT OF
TRANSPORTATION ESTIMATED AT LEAST 30 STATE HIGHWAY BRIDGES
WERE DESTROYED AND AN ADDITIONAL 20 SERIOUSLY DAMAGED.
PRELIMINARY ASSESSMENTS OF THE STATE'S INFRASTRUCTURE
SHOWED DAMAGE OF $40 MILLION TO ROADS AND $112 MILLION TO
BRIDGES. REPAIR COSTS FOR STATE AND AND COUNTY ROADS RAN
INTO THE HUNDREDS OF MILLIONS OF DOLLARS. MILES OF FREIGHT
AND PASSENGER RAIL LINES WERE WASHED OUT OR SUBMERGED...
INCLUDING A SECTION SERVICING AMTRAK'S ICONIC CALIFORNIA
ZEPHYR. THE TOWN OF LYONS WAS ISOLATED BY THE FLOODING
OF ST. VRAIN CREEK...AND SEVERAL EARTH DAMS ALONG THE
FRONT RANGE BURST OR WERE OVER-TOPPED. FLOODWATERS SWEPT
THROUGH ESTES PARK; DAMAGED HUNDREDS OF BUILDINGS AND
DESTROYED LARGE SECTIONS OF U.S. 34 FROM LOVELAND AND U.S.
36 FROM LYONS TO BOULDER. U.S. 34 SUFFERED THE MOST DAMAGE...
WITH 85 PERCENT OF ITS ROADWAY AND BRIDGES DESTROYED. IN
WELD COUNTY...ABOUT NEARLY TWO THOUSAND GAS WELLS WERE
DAMAGED AND HAD TO BE CLOSED OFF AS THE FLOODWATERS
INUNDATED ENTIRE COMMUNITIES. SEWAGE TREATMENT PLANTS AND
OTHER UTILITIES WERE KNOCKED OUT IN A NUMBER OF TOWNS.
GOVERNOR HICKENLOOPER DECLARED A DISASTER EMERGENCY ON
SEPTEMBER 13TH...IN 11 COUNTIES ACROSS NORTHEAST COLORADO
INCLUDING: ADAMS...ARAPAHOE...BROOMFIELD...BOULDER...DENVER...
JEFFERSON...LARIMER...LOGAN...MORGAN...WASHINGTON AND WELD. BY
THE 15TH...FEDERAL EMERGENCY DECLARATIONS COVERED THOSE
COUNTIES AS WELL AS CLEAR CREEK COUNTY. PROJECTED LOSSES
FROM THE FLOODING STATEWIDE WAS NEARLY TWO BILLION DOLLARS
IN PROPERTY DAMAGE...ACCORDING TO EQECAT...A CATASTROPHE
MODELING FIRM. THE DAMAGE WAS MOST SEVERE IN AND AROUND
LYONS AND BOULDER. MORE THAN 11 THOUSAND PEOPLE WERE
EVACUATED...REPORTEDLY THE LARGEST SINCE HURRICANE
KATRINA. PRESIDENT OBAMA DECLARED A STATE OF EMERGENCY
FOR BOULDER AND LARIMER COUNTIES. AN ADDITIONAL 10
COUNTIES WERE ADDED ON THE 16TH AND INCLUDED: ADAMS...
ARAPAHOE...BROOMFIELD...CLEAR CREEK...DENVER...JEFFERSON...
MORGAN...LOGAN...WASHINGTON AND WELD COUNTIES. THE
PRESIDENT ALSO DECLARED A MAJOR DISASTER SPECIFICALLY
FOR BOULDER COUNTY. THERE WERE SIX FATALITIES
DIRECTLY ATTRIBUTED TO FLASH FLOODING. TWO 19-YR OLD
TEENAGERS DIED ON THE 11TH...AFTER THEY WERE SWEPT
AWAY BY FLOODWATERS AFTER ABANDONING THEIR CAR ON
LINDON DRIVE IN BOULDER. IN JAMESTOWN...A 72-YR OLD
MAN WAS KILLED WHEN THE BUILDING HE WAS IN COLLAPSED.
AN 80-YR OLD LYONS RESIDENT DIED IN THE EARLY MORNING
HOURS OF THE 12TH...WHEN HIS TRUCK WAS SWEPT INTO THE
ST. VRAIN RIVER NEAR HIS HOME. LATER ON THE 12TH...A
79-YR OLD LARIMER COUNTY RESIDENT WAS KILLED WHEN SHE
WAS SWEPT AWAY WHILE TRYING TO CLIMB TO SAFETY FROM
HER HOME IN CEDAR POINT. A 61-YR OLD CEDAR POINT
RESIDENT DIED WHEN HER HOME WAS SWEPT DOWN THE BIG
THOMPSON RIVER BY THE FLOODWATERS. AN 80-YR OLD
IDAHO SPRINGS RESIDENT DROWNED IN CLEAR CREEK WHEN
THE EMBANKMENT HE WAS STANDING ON COLLAPSED. IN
BOULDER...SOME OF THE MONTHLY RECORDS BROKEN INCLUDED:
ONE-DAY ALL-TIME RECORD: 9.08 INCHES WHICH SHATTERED
THE PREVIOUS WETTEST DAY OF 4.8 INCHES SET ON JULY 31...
1919; ONE-MONTH RECORD OF 18.16 INCHES...WHICH BROKE
THE PREVIOUS ALL-TIME MONTHLY RECORD OF 9.59 INCHES SET
IN MAY OF 1995; WETTEST SEPTEMBER ON RECORD WHICH BROKE
THE PREVIOUS RECORD OF 5.5 INCHES SET IN SEPTEMBER OF
1940; ONE-YEAR RECORD OF 34.15 INCHES BROKE THE PREVIOUS
WETTEST YEAR OF 29.93 INCHES SET IN 1995. AT DENVER
INTERNATIONAL AIRPORT...THE TOTAL PRECIPITATION FOR THE
MONTH OF SEPTEMBER WAS 5.61 INCHES...WHICH WAS 4.65
INCHES ABOVE THE NORMAL OF 0.96 INCHES. THIS IS THE MOST
PRECIPITATION EVER RECORDED IN DENVER FOR THE MONTH OF
SEPTEMBER. DAILY PRECIPITATION RECORDS INCLUDED 1.11
INCHES ON THE 12TH AND 2.01 INCHES ON THE 14TH.
11-12 IN 1974...POST-FRONTAL RAIN CHANGED TO SNOW OVERNIGHT FOR THE
FIRST SNOW OF THE SEASON. SNOWFALL TOTALED ONLY 1.8 INCHES
AT STAPLETON INTERNATIONAL AIRPORT WHERE NORTH WINDS GUSTED
TO 40 MPH ON THE 11TH. HIGH TEMPERATURE OF ONLY 46 DEGREES
ON THE 12TH SET A NEW RECORD LOW MAXIMUM FOR THE DATE.
12 IN 1887...WEST WINDS TO 42 MPH WERE RECORDED IN THE CITY.
IN 1952...A THUNDERSTORM OUTFLOW PRODUCED STRONG SOUTHEAST
WINDS GUSTING TO 52 MPH. SURFACE VISIBILITY AT STAPLETON
AIRPORT WAS BRIEFLY REDUCED TO 2 MILES IN BLOWING DUST.
IN 1963...A NEARLY STATIONARY...WHITE TORNADO NEAR BENNETT WAS
SIGHTED FROM DENVER. NO DAMAGE WAS REPORTED.
IN 1989...AN EARLY SNOWFALL AND THE FIRST OF THE SEASON
BROUGHT 2 TO 3 INCHES OF SLUSH TO METRO DENVER. MORE SNOW
WHITENED THE FOOTHILLS WEST OF DENVER WHERE 6 INCHES WERE
MEASURED AT EVERGREEN. THE SNOW FELL ON LEAF LADEN TREES...
AND SAGGING BRANCHES ONTO POWER LINES CAUSED OUTAGES. MUCH
OF DENVER'S SNOW FELL DURING THE EVENING RUSH HOUR...CREATING
TRAFFIC CHAOS. SNOWFALL TOTALED 2.3 INCHES AT STAPLETON
INTERNATIONAL AIRPORT WHERE THE MAXIMUM SNOW DEPTH ON THE
GROUND WAS ONLY 1 INCH DUE TO MELTING.
IN 1994...THUNDERSTORM MICROBURST WINDS GUSTED TO 67 MPH IN
BOULDER. NO DAMAGE WAS REPORTED.
IN 2002...A SEVERE THUNDERSTORM PRODUCED HAIL AS LARGE AS
1 INCH IN DIAMETER NEAR CASTLE ROCK.
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