A potent spring storm brought a very heavy and wet snowfall to parts of the Front Range Mountains and Foothills. The heaviest snow fell in the foothills of Larimer and Boulder Counties.
Every event with a place to put it; 6 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.
A potent spring storm brought a very heavy and wet snowfall to parts of the Front Range Mountains and Foothills. The heaviest snow fell in the foothills of Larimer and Boulder Counties. A trained spotter in Sand Creek Park in northern Larimer County reported a storm total of 52 inches; 37 inches of which fell in a 24-hr period. Elsewhere in the Front Range Mountains and Foothills, storm totals included: 27.5 inches at Allenspark; 25 inches at Bear Lake SNOTEL; 24 inches near Blackhawk; 23 inches near Idledale; 21 inches at Cabin Creek SNOTEL; 20 inches, 11 miles west-southwest of Livermore; 19 inches at Deadman Hill SNOTEL; 18 inches near Evergreen; 16.5 inches at Estes Park; 16 inches near Jamestown; 14 inches at Coal Creek Canyon and Fremont Pass SNOTEL.
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 Apr 16, 8:44 AM MST, 3 hours 16 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER/BOULDER CO 944 AM MDT THU APR 16 2015 .UPDATE... ISSUED AT 944 AM MDT THU APR 16 2015 THE PLATTEVILLE PROFILER IS SHOWING NORTHEAST TO EAST WINDS OF 30 TO 40 KNOTS. SO WOULD EXPECT SNOW TO CONTINUE ALONG THE FRONT RANGE WITH NO BREAK IN PRECIPITATION THROUGH TONIGHT. TEMPERATURES ARE HOVERING AROUND FREEZING...THIS WILL LIMIT THE SNOW ACCUMULATION TO A FEW INCHES ON GRASSY SURFACE ALONG THE FRONT RANGE. AS LOW LEVEL WINDS TURN MORE EASTERLY LATE THIS AFTERNOON AND EVENING THIS WILL PULL IN MORE MOISTURE AND SLIGHTLY WARMER AIR. STILL EXPECTING A CHANGE OVER TO RAIN FOR ELEVATIONS BELOW 5000 THIS AFTERNOON. FOR 5000 TO 6000 FEET...THE CHALLENGE CONTINUES TO BE WHEN THE RAIN WILL CHANGE TO SNOW. MOST MODELS SHOW BY MIDNIGHT IT WILL BE WARM ENOUGH FOR RAIN UP TO 6000 FEET...THOUGH WOULDN'T BE SURPRISED IF SNOW PERSIST NEAR THE FOOTHILLS BELOW 6000 FEET WHERE THE PRECIPITATION INTENSITY MAY BE THE STRONGEST. WILL LOOK INTO ISSUE AN WINTER WEATHER ADVISORY OR WINTER STORM WARNING FOR THE PALMER DIVIDE AND PARK COUNTY. AN ADDITIONAL CONCERN WITH THIS SYSTEM WILL BE A CHANCE FOR SEVERE WEATHER OVER THE EASTERN PLAINS ON FRIDAY. THIS WILL DEPEND ON THE TRACK OF THE LOW AND HOW MUCH WARM AIR IS ADVECTED OVER THE EASTERN PLAINS. && .SHORT TERM...(TODAY THROUGH TONIGHT ) ISSUED AT 500 AM MDT THU APR 16 2015 UPPER LOW DROPPING SOUTH ACROSS EASTERN UTAH AT THIS TIME. MODELS ARE NOT IN TOO BAD OF A SHAPE TO START WITH BUT THEIR DIFFERENCES GROW WITH TIME. SOME SMALL TRENDS SEEM PRETTY CLEAR THOUGH AND MAIN ADJUSTMENTS FOR THIS PACKAGE ARE MAKING THE FORECAST A BIT WETTER AND WARMER. UPPER LOW APPEARS TO BE CLOSING OFF MORE THAN THE NAM SHOWS...AS IT LIKES TO MAINTAIN A N-S ELONGATED UPPER TROUGH THROUGH FRIDAY. THE DIVERGENCE DEVELOPING OVER THE MIDDLE OF COLORADO SUGGEST THIS IS NOT HAPPENING THAT MUCH YET. LEANING TOWARD THE MORE CLOSED OFF GFS SOLUTION...THOUGH HESITANT ABOUT THE EXACT PLACEMENT/TIMING OF ITS MOTION. THE LOW ALSO APPEARS TO BE DROPPING FURTHER WEST AND POSSIBLY A BIT FURTHER SOUTH THAN WHAT THE 00Z GFS SHOWED. THIS COULD LEAD TO A BIT FURTHER SOUTH/SLOWER TRACK...BUT THIS WOULD ALSO FAVOR A WETTER SOLUTION FOR OUR AREA. DEPENDING ON THE DETAILS...THE TRACK COULD WIND UP FAVORING LARIMER/BOULDER COUNTIES...OR IF IT IS FURTHER SOUTH AND HAS A SHARPLY CLOSED CIRCULATION...COULD STILL FAVOR AREAS WEST/SOUTHWEST OF DENVER. IN ANY EVENT...AREAS ABOVE 7000 FEET SHOULD GET DUMPED ON. THE PLAINS AIRMASS IS REALLY MOIST AND WILL BE HARD TO COOL. MODELS CONTINUE TO SHOW THE LACK OF MUCH MORE COOLING WITH THIS SYSTEM...AND A SLOWER MOTION WOULD GIVE MORE TIME FOR THIS WARM AIR TO MOVE IN. SO THESE SOLUTIONS ARE WETTER...BUT WARMER. COLD ENOUGH FOR SNOW IN DENVER NOW...BUT WITH THE WARM ADVECTION IN THE HEART OF THE SYSTEM TONIGHT THERE IS SOME DOUBT ABOUT IT STILL BE COLD ENOUGH WHEN THE HEAVY PRECIP FALLS...AND THERE COULD BE WARMING OVERNIGHT. FOR NOW I JUST NUDGED THE TEMPERATURE UP A LITTLE BIT...THE STRONG LIFT MAY HELP WITH THE COOLING BUT NO EVAPORATION TO HELP IN THIS SITUATION. GRIDS SHOW A SHARP GRADIENT IN SNOWFALL BETWEEN 5500 AND 6500 FEET...WHICH COULD BE OFF BY 500 FEET OR SO EITHER WAY. MOVED UP THE START TIME OF THE WINTER STORM WARNING TO 8 AM DUE TO THE SHOWERS DEVELOPING OVER THE MOUNTAINS AT THIS TIME...REPORT JUST CAME IN THAT I-70 IN SUMMIT COUNTY IS STARTING TO SLUSH UP ALREADY. CONSIDERED ADVISORIES FOR SOME AREAS BUT TOO MUCH UNCERTAINTY. SOUTH PARK WOULD DO WELL WITH A SLOWER/MORE SOUTHERLY TRACK...BUT WILL SHUT DOWN AS THE WINDS GO MORE NORTHEASTERLY. FOR NOW RAISED POPS AND AMOUNTS THERE A BIT. FOR FRINGE ZONES NEAR THE FOOTHILLS...DOUGLAS/JEFFERSON/LARIMER COUNTIES IT IS POSSIBLE PARTS OF THESE AREAS WILL GET QUITE HEAVY SNOW AND OTHER PARTS WILL SEE LITTLE IMPACT DUE TO THE TEMPERATURES. GIVEN THAT THE WARM GROUND WILL ALSO LIMIT IMPACT EVEN WHERE THERE IS HEAVY SNOW...I HAVE CHOSEN NOT TO ISSUE ADVISORIES AT THIS TIME. IF IT TURNS OUT TO BE SLIGHTLY COOLER PLACES LIKE CASTLE ROCK...BOULDER...AND AREAS NORTH OF FORT COLLINS COULD NEED ADVISORIES OR EVEN WARNINGS...BUT THERE COULD WIND UP BEING LITTLE IMPACT AT ALL. .LONG TERM...(FRIDAY THROUGH WEDNESDAY) ISSUED AT 500 AM MDT THU APR 16 2015 THE UPPER LOW BY 12Z FRI WILL BE ALONG THE CO/NM BORDER NEAR ALAMOSA. AFTER THAT I HAVE LITTLE CONFIDENCE WITH REGARD TO WHERE THIS LOW WILL END UP BY FRI AFTN INTO FRI EVENING. BASED ON LOOKING AT HEIGHT FALLS AND MID LVL COLD POOL IT SHOULD MOVE ENE TOWARDS PUEBLO BY 18Z. AFTER THAT GRIDDED DATA SHOWS THE MID LVL COLD POOL BY LATE AFTN/EARLY EVENING COULD BE CENTERED ANYWHERE FM NR DENVER OR SE OF LIMON. NATURALLY A SHIFT NORTHWARD OR SOUTHWARD BY 100-200 MILES COULD HAVE A DRAMATIC AFFECT ON ADDITIONAL PCPN AMOUNTS FRI AFTN INTO FRI EVENING OVER NRN CO. AT THIS POINT IT APPEARS THE MAIN UPPER LEVEL LOW WILL STAY OVER SRN COLORADO THROUGH FRIDAY MORNING WITH ADDITIONAL PCPN OVER PORTIONS OF NRN CO THRU MIDDAY. BUFFER DATA SHOWS PCPN WILL FALL AS RAIN OVER MOST OF NERN CO EXCEPT POSSIBLY NR THE FOOTHILLS AND OVER THE PALMER DIVIDE WHERE A MIX MAY OCCUR. IN THE FOOTHILLS AND MTNS THE THREAT FOR HEAVY SNOW WILL CONTINUE THRU MIDDAY. BY LATER IN THE AFTN INTO THE EARLY EVENING HOURS THE BEST CHC OF PCPN MAY SHIFT TO NRN AREAS OF THE FCST AREA MAINLY NORTH OF A DENVER TO AKRON LINE. WITH STEEP LAPSE RATES WILL LIKELY SEE SOME CONVECTION AS WELL BY AFTN IN SOME AREAS. ALSO THERE COULD BE SOME THREAT FOR SVR STORMS OVER THE PLAINS ALONG AND SOUTH OF I-70 BY AFTN ALONG A CONVERGENCE ZN THAT DVLPS AS SFC LOW PRES FORMS NEAR PUEBLO. THE HIGHEST THREAT FOR ADDITIONAL HEAVY SNOW WILL PROBABLY FOCUS MORE IN THE NRN FOOTHILLS AND MTN AREAS NORTH OF I-70 IN THE AFTN. FOR FRI NIGHT AS MENTIONED ABV THE FCST WILL HINGE ON WHERE THE MAIN UPPER LEVEL LOW IS. SO FAR MOST OF THE MODELS KEEP IT NR DENVER HOWEVER IT WOULD NOT BE A TOTAL SURPRISE IF IT ENDS UP EAST OR SE OF DENVER. AT THIS POINT WILL KEEP THE HIGHEST POPS IN THE NRN FOOTHILLS AND MTN AREAS WITH CHC POPS OVER THE PLAINS. TOTAL ACCUMULATIONS IN THE FOOTHILLS AND MTNS AREAS WILL RANGE FM 1 TO 2 FEET RANGE ALTHOUGH SOME MTN AREAS OF LARIMER AND BOULDER COULD SEE UP TO 3 FEET. BY SAT THE MAIN UPPER LEVEL LOW IS FCST TO MOVE INTO SERN CO AFTER SUPPOSEDLY BEING OVER NRN COLORADO FRI NIGHT. THIS WOULD LEAVE NRN CO ON THE WESTERN SIDE THE LOW WITH SOME POTENTIAL FROM PCPN TO OCCUR ON THE BACKSIDE. FOR NOW HAVE KEPT POPS IN THE CHC CATEGORY IN ALL AREAS HOWEVER THESE MAY NEED TO BE INCREASED AT SOME POINT DEPENDING ON HOW THINGS EVOLVE. OVERALL TEMPS WILL REMAIN RATHER WRM SO PCPN WOULD CONTINUE AS RAIN ACROSS THE PLAINS WITH SNOW CONFINED TO THE FOOTHILLS AND MTNS. FOR SUN INTO MON THE FLOW ALOFT WILL BE NWLY AS THE UPPER LEVEL SYSTEM MOVES AWAY FM THE AREA. THERE WILL BE A COUPLE OF SURGES MOVING ACROSS WHICH WILL ENHANCE UPSLOPE FLOW ESPECIALLY SUN NIGHT INTO MON. IN ADDITION A WK SYSTEM EMBEDDED IN THE FLOW MAY MOVE ACROSS AS WELL WHICH COULD LEAD TO ANOTHER CHC OF PCPN SUN NIGHT INTO MON. CURRENT TEMP PROFILE SUGGEST AIRMASS WILL BE COLD ENOUGH FOR PCPN TO FALL AS SNOW EVEN AT LOWER ELEVATIONS. HIGH BOTH DAYS WILL STAY BLO SEASONAL NORMALS. BY TUE THERE ARE SOME DIFFERENCES AS THE GEM MODEL SHOWS ANOTHER SURGE OF COOLER AIR AND WK TROUGH MOVING ACROSS WITH A CHC OF PCPN. MEANWHILE THE ECMWF AND GFS DO NOT SHOW THIS FEATURE AND HAVE DRIER NWLY FLOW ALOFT ACROSS THE AREA. FOR NOW WILL JUST KEEP IN SOME LOW POPS AND KEEP TEMPS NR SEASONAL NORMALS. && .AVIATION...(FOR THE TAFS THROUGH 18Z FRIDAY MORNING) ISSUED AT 944 AM MDT THU APR 16 2015 SNOW WILL LIKELY LINGER THROUGH 21Z AT KBJC AND KAPA. A CHANGE TO RAIN IS EXPECTED A LITTLE SOONER. THOUGH PERIODS OF SNOW WILL REMAIN POSSIBLE THROUGH THE EVENING UNDER AREAS OF HEAVIER PRECIPITATION. VISIBILITY WILL GENERALLY RANGE FROM 1 TO 3 MILES...THOUGH IT WILL OCCASIONAL FALL TO A QUARTER MILE DURING HEAVY SNOW. CEILINGS WILL REMAIN IN THE 500 TO 1500 RANGE THROUGH FRIDAY MORNING. SNOW ACCUMULATION FOR KDEN IS STILL EXPECT TO BE LIGHT...LESS THAN 3 INCHES. HEAVIER AMOUNTS WILL BE POSSIBLE AT KBJC AND KAPA. && .BOU WATCHES/WARNINGS/ADVISORIES... WINTER STORM WARNING UNTIL 6 AM MDT SATURDAY FOR COZ033>036. && UPDATE...MEIER SHORT TERM...GIMMESTAD LONG TERM...RPK AVIATION...MEIER
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER/BOULDER CO 1040 AM MDT THU APR 16 2015 COZ030>051-171645- 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- 1040 AM MDT THU APR 16 2015 ...WINTER STORM WARNING FOR THE MOUNTAINS AND FOOTHILLS THIS AFTERNOON THROUGH FRIDAY NIGHT... THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT A STRONG AND MOIST SPRING STORM SYSTEM WILL BRING RAIN AND SNOW TO MUCH OF COLORADO TODAY. THE SNOW WILL BE HEAVIEST ON THE EAST SLOPES OF THE FRONT RANGE...WHERE 10 TO 24 INCHES OF SNOW MAY FALL BY FRIDAY MORNING. OTHER MOUNTAIN AREAS...CAN EXPECT 4 TO 10 INCHES OF SNOW. ON THE EASTERN PLAINS...PRECIPITATION WILL MAINLY BE RAIN...BUT IN AREAS ABOVE 5000 FEET INCLUDING DENVER WILL MAINLY SEE SNOW THROUGH THE AFTERNOON. PERIODS OF HEAVIER SNOW THROUGH THIS EVENING COULD CAUSE SIGNIFICANT ACCUMULATIONS IN AREAS SOUTH OF DENVER AND NEAR THE FOOTHILLS WHERE 4 TO 8 INCHES OF SNOW WILL BE POSSIBLE. FOR THE REST OF DENVER AREA...UP TO 4 INCHES OF SNOW WILL BE POSSIBLE THROUGH TONIGHT. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THE STORM SYSTEM WILL CONTINUE TO AFFECT COLORADO ON FRIDAY AND MAY LINGER INTO SATURDAY. PERIODS OF SNOW WILL CONTINUE IN THE MOUNTAINS AND FOOTHILLS ON FRIDAY AND MAY BE HEAVY AT TIMES. ADDITIONAL ACCUMULATIONS OF 6 TO 12 INCHES WILL OCCUR WITH LOCALLY HIGHER AMOUNTS POSSIBLE IN THE MOUNTAINS OF LARIMER AND BOULDER COUNTIES. OVER THE PLAINS...THERE WILL BE PERIODS OF RAIN ALONG WITH A FEW THUNDERSTORMS. THERE ALSO LOOKS TO BE A SLIGHT RISK OF SEVERE WEATHER ACROSS THE FAR EASTERN PLAINS DURING THE AFTERNOON WITH LARGE HAIL AND POSSIBLY A TORNADO. SOME SNOW MAY BE MIXED IN WITH THE RAIN EARLY FRIDAY MORNING ALONG THE FRONT RANGE BUT ACCUMULATIONS WILL ONLY BE AROUND AN INCH OR SO ON GRASSY AREAS. FOR FRIDAY NIGHT INTO SATURDAY THE STORM SYSTEM WILL BE OVER EASTERN COLORADO. DEPENDING ON EXACTLY WHERE THIS SYSTEM IS CENTERED COULD LEAD TO MORE PRECIPITATION IN SOME AREAS ESPECIALLY CLOSER TO THE WYOMING BORDER. TEMPERATURES WILL BE WARM ENOUGH FOR PRECIPITATION TO FALL AS RAIN OVER THE PLAINS. THE SYSTEM SHOULD FINALLY MOVE EAST OF THE AREA BY SATURDAY NIGHT INTO SUNDAY. ANOTHER WEAKER SYSTEM MAY AFFECT THE AREA LATE SUNDAY NIGHT INTO MONDAY BRINGING ANOTHER CHANCE OF PRECIPITATION. .SPOTTER INFORMATION STATEMENT... SNOWFALL REPORTS FROM SPOTTERS WILL BE APPRECIATED.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
909 AM MDT THU APR 16 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0853 AM SNOW GENESEE 39.69N 105.27W
04/16/2015 M2.4 INCH JEFFERSON CO TRAINED SPOTTER
0844 AM SNOW PARKER 39.51N 104.76W
04/16/2015 M1.9 INCH DOUGLAS CO TRAINED SPOTTER
0844 AM SNOW 4 W BAKERVILLE 39.69N 105.88W
04/16/2015 M1.0 INCH CLEAR CREEK CO TRAINED SPOTTER
EISENHOWER TUNNEL
0830 AM SNOW 3 N BLACK HAWK 39.84N 105.49W
04/16/2015 M1.7 INCH GILPIN CO TRAINED SPOTTER
0820 AM SNOW 2 SSW BOULDER 40.00N 105.27W
04/16/2015 M0.6 INCH BOULDER CO NWS EMPLOYEE
DAVID SKAGGS RESEARCH CENTER NOAA
0730 AM SNOW 4 SSE BROOKVALE 39.58N 105.39W
04/16/2015 M2.0 INCH JEFFERSON CO TRAINED SPOTTER
0730 AM SNOW 4 ENE BOULDER 40.05N 105.18W
04/16/2015 M1.0 INCH BOULDER CO TRAINED SPOTTER
0700 AM SNOW EVERGREEN 39.63N 105.34W
04/16/2015 M0.8 INCH JEFFERSON CO CO-OP OBSERVER
&&
KFREDINPRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
1010 AM MDT THU APR 16 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1000 AM SNOW 3 WSW CONIFER 39.50N 105.35W
04/16/2015 M4.0 INCH JEFFERSON CO TRAINED SPOTTER
0956 AM HEAVY SNOW ST MARYS GLACIER 39.84N 105.65W
04/16/2015 M6.0 INCH CLEAR CREEK CO TRAINED SPOTTER
0926 AM SNOW 2 NE ESTES PARK 40.39N 105.49W
04/16/2015 M1.0 INCH LARIMER CO TRAINED SPOTTER
0926 AM SNOW 4 ENE CONIFER 39.54N 105.23W
04/16/2015 M4.0 INCH JEFFERSON CO TRAINED SPOTTER
0926 AM SNOW 2 SSW BOULDER 40.00N 105.27W
04/16/2015 M1.9 INCH BOULDER CO NWS EMPLOYEE
DAVID SKAGGS RESEARCH CENTER NOAA
0924 AM SNOW 3 S EVERGREEN 39.59N 105.34W
04/16/2015 M4.0 INCH JEFFERSON CO TRAINED SPOTTER
0916 AM SNOW 5 E BOULDER 40.03N 105.16W
04/16/2015 M2.0 INCH BOULDER CO TRAINED SPOTTER
0913 AM SNOW FEDERAL HEIGHTS 39.87N 105.02W
04/16/2015 M1.0 INCH ADAMS CO TRAINED SPOTTER
0908 AM SNOW 1 SW WESTMINSTER 39.87N 105.06W
04/16/2015 M1.7 INCH JEFFERSON CO TRAINED SPOTTER
0901 AM SNOW CENTENNIAL 39.60N 104.87W
04/16/2015 M2.0 INCH ARAPAHOE CO NWS EMPLOYEE
0853 AM SNOW GENESEE 39.69N 105.27W
04/16/2015 M2.4 INCH JEFFERSON CO TRAINED SPOTTER
0844 AM SNOW 4 W BAKERVILLE 39.69N 105.88W
04/16/2015 M1.0 INCH CLEAR CREEK CO TRAINED SPOTTER
EISENHOWER TUNNEL
0844 AM SNOW PARKER 39.51N 104.76W
04/16/2015 M1.9 INCH DOUGLAS CO TRAINED SPOTTER
0830 AM SNOW 3 N BLACK HAWK 39.84N 105.49W
04/16/2015 M1.7 INCH GILPIN CO TRAINED SPOTTER
0800 AM SNOW BAILEY 39.40N 105.47W
04/16/2015 M4.0 INCH PARK CO TRAINED SPOTTER
0730 AM SNOW 4 SSE BROOKVALE 39.58N 105.39W
04/16/2015 M2.0 INCH JEFFERSON CO TRAINED SPOTTER
0730 AM SNOW 4 ENE BOULDER 40.05N 105.18W
04/16/2015 M1.0 INCH BOULDER CO TRAINED SPOTTER
0700 AM SNOW EVERGREEN 39.63N 105.34W
04/16/2015 M0.8 INCH JEFFERSON CO CO-OP OBSERVER
&&
KFREDINPRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
1205 PM MDT THU APR 16 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1200 PM SNOW 3 W DENVER INTL AIRPORT 39.87N 104.73W
04/16/2015 M1.0 INCH DENVER CO OFFICIAL NWS OBS
1130 AM SNOW 4 ENE NEDERLAND 39.98N 105.44W
04/16/2015 M5.0 INCH BOULDER CO TRAINED SPOTTER
1130 AM SNOW 1 NW SUPERIOR 39.94N 105.17W
04/16/2015 M4.4 INCH BOULDER CO TRAINED SPOTTER
1126 AM SNOW WHEAT RIDGE 39.77N 105.10W
04/16/2015 M3.7 INCH JEFFERSON CO CO-OP OBSERVER
1120 AM SNOW 3 NE CASTLE ROCK 39.41N 104.81W
04/16/2015 M2.0 INCH DOUGLAS CO AMATEUR RADIO
1053 AM SNOW 2 SSW BOULDER 40.00N 105.27W
04/16/2015 M2.8 INCH BOULDER CO NWS EMPLOYEE
DAVID SKAGGS RESEARCH CENTER NOAA
1046 AM SNOW WESTMINSTER 39.88N 105.05W
04/16/2015 M3.0 INCH ADAMS CO TRAINED SPOTTER
1043 AM SNOW GENESEE 39.69N 105.27W
04/16/2015 M4.7 INCH JEFFERSON CO TRAINED SPOTTER
1040 AM HEAVY SNOW 8 NE FOUR CORNERS 40.94N 105.80W
04/16/2015 M7.0 INCH LARIMER CO TRAINED SPOTTER
SAND CREEK PARK
1022 AM SNOW ARVADA 39.82N 105.11W
04/16/2015 M2.5 INCH JEFFERSON CO NWS EMPLOYEE
1000 AM SNOW 3 WSW CONIFER 39.50N 105.35W
04/16/2015 M4.0 INCH JEFFERSON CO TRAINED SPOTTER
1000 AM SNOW 2 N LONGMONT 40.20N 105.11W
04/16/2015 M0.8 INCH BOULDER CO TRAINED SPOTTER
0956 AM HEAVY SNOW ST MARYS GLACIER 39.84N 105.65W
04/16/2015 M6.0 INCH CLEAR CREEK CO TRAINED SPOTTER
0926 AM SNOW 4 ENE CONIFER 39.54N 105.23W
04/16/2015 M4.0 INCH JEFFERSON CO TRAINED SPOTTER
0926 AM SNOW 2 NE ESTES PARK 40.39N 105.49W
04/16/2015 M1.0 INCH LARIMER CO TRAINED SPOTTER
0924 AM SNOW 3 S EVERGREEN 39.59N 105.34W
04/16/2015 M4.0 INCH JEFFERSON CO TRAINED SPOTTER
0916 AM SNOW 5 E BOULDER 40.03N 105.16W
04/16/2015 M2.0 INCH BOULDER CO TRAINED SPOTTER
0913 AM SNOW FEDERAL HEIGHTS 39.87N 105.02W
04/16/2015 M1.0 INCH ADAMS CO TRAINED SPOTTER
0908 AM SNOW 1 SW WESTMINSTER 39.87N 105.06W
04/16/2015 M1.7 INCH JEFFERSON CO TRAINED SPOTTER
0901 AM SNOW CENTENNIAL 39.60N 104.87W
04/16/2015 M2.0 INCH ARAPAHOE CO NWS EMPLOYEE
0844 AM SNOW PARKER 39.51N 104.76W
04/16/2015 M1.9 INCH DOUGLAS CO TRAINED SPOTTER
0844 AM SNOW 4 W BAKERVILLE 39.69N 105.88W
04/16/2015 M1.0 INCH CLEAR CREEK CO TRAINED SPOTTER
EISENHOWER TUNNEL
0830 AM SNOW 3 N BLACK HAWK 39.84N 105.49W
04/16/2015 M1.7 INCH GILPIN CO TRAINED SPOTTER
0800 AM SNOW BAILEY 39.40N 105.47W
04/16/2015 M4.0 INCH PARK CO TRAINED SPOTTER
0730 AM SNOW 4 ENE BOULDER 40.05N 105.18W
04/16/2015 M1.0 INCH BOULDER CO TRAINED SPOTTER
0730 AM SNOW 4 SSE BROOKVALE 39.58N 105.39W
04/16/2015 M2.0 INCH JEFFERSON CO TRAINED SPOTTER
0700 AM SNOW EVERGREEN 39.63N 105.34W
04/16/2015 M0.8 INCH JEFFERSON CO CO-OP OBSERVER
0700 AM SNOW 3 SE BRIGHTON 39.95N 104.75W
04/16/2015 M0.6 INCH ADAMS CO TRAINED SPOTTER
&&
KFREDINThe national radar mosaic for the moment the first event began.
4 winter storm, 2 winter weather. Local standard time, as filed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2015Every state in 2015This day in weather historyWarnings in Colorado, April 2015
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: 563625, 563626, 563628, 563630, 563636, 563676.