Another winter storm brought additional snowfall to the high country. Storm totals included: 10 inches at Columbine SNOTEL, 8 inches at Breckenridge Ski Area and Buffalo Park SNOTEL, and 7 inches at Loveland Ski Area.
Every event with a place to put it; 3 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.
Another winter storm brought additional snowfall to the high country. Storm totals included: 10 inches at Columbine SNOTEL, 8 inches at Breckenridge Ski Area and Buffalo Park SNOTEL, and 7 inches at Loveland Ski Area.
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 11, 3:26 AM MST, 2 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER CO 426 AM MDT MON APR 11 2011 .SHORT TERM...FEW CHANGES NEEDED IN THE FIRST 24 HOURS OF THE FORECAST. LINGERING FLURRIES ON THE MOUNTAIN RIDGES SHOULD DISSIPATE BY SUNRISE WITH DRIER AIR ARRIVING. UPPER RIDGE AXIS MOVES ACROSS TODAY WITH STRONG WARMING AND VERY DRY AIR ALOFT. DEW POINTS SHOULD DROP NICELY WITH MIXING THIS AFTERNOON...BUT SURFACE WINDS SHOULD BE LIGHT ACROSS THE LOWER ELEVATIONS AT THAT TIME. DRY SOUTHWEST FLOW ALOFT TONIGHT...SLIGHT WARM ADVECTION MAY PRODUCE SOME HIGH CLOUDS BUT NOT A LOT TO WORK WITH YET. CURRENT FORECAST TEMPS ARE NEAR GUIDANCE FOR HIGHS TODAY...ABOUT 10-15 DEGREES WARMER THAN YESTERDAY...THEN SLIGHTLY WARMER THAN GUIDANCE TONIGHT...ALL LOOKS FINE. .LONG TERM...MODELS SHOW A DIEING SOUTHWESTERLY JET MAXIMUM OVER COLORADO FOR THE FIRST HALF OF TUESDAY. WEAKER SOUTHWESTERLY FLOW ALOFT CONTINUES OVER THE FORECAST AREA TUESDAY AFTERNOON AND EVENING. IT BECOMES MORE ZONAL LATE TUESDAY NIGHT/EARLY WEDNESDAY MORNING AS A WEAK UPPER TROUGH PUSHES ACROSS BY 12Z WEDNESDAY MORNING. MODERATE WEST-SOUTHWESTERLY FLOW ALOFT IS PROGGED FOR WEDNESDAY AND WEDNESDAY NIGHT...WITH ANOTHER UPPER TROUGH MOVING INTO THE WESTERN FORECAST AREA BY 12Z THURSDAY MORNING. THERE IS UPWARD VERTICAL VELOCITY PROGGED TUESDAY AND TUESDAY NIGHT FOR THE CWA...WITH A BRIEF BATCH OF DOWNWARD MOTION THROUGH WEDNESDAY AFTERNOON. WEDNESDAY EVENING INTO THURSDAY MORNING...UPWARD MOTION IS INDICATED ONCE AGAIN. THE BOUNDARY LAYER FLOW IS DOMINATED BY A WEAK LOW LEVEL TROUGH EAST OF THE MOUNTAINS TUESDAY MORNING. BY LATE MORNING...A SURGE OF COOLER AIR/UPSLOPE IS PROGGED IN...AND COVERS MUCH OF THE PLAINS BY TUESDAY AFTERNOON AT 00Z. NORTHEASTERLY UPSLOPE IS PROGGED FOR ALL THE PLAINS AND FOOTHILLS TUESDAY NIGHT INTO WEDNESDAY MORNING...BEFORE BECOMING DUE EASTERLY WEDNESDAY AFTERNOON AND EARLY EVENING...THEN SOUTHEASTERLY THE REST OF THE WEDNESDAY NIGHT. FOR MOISTURE...MODELS SHOW TUESDAY TO BE DRY...WITH INCREASING MID AND UPPER LEVEL MOISTURE DURING THE AFTERNOON. MOISTURE DEEPENS AND LOWERS TUESDAY EVENING AND NIGHT. THERE IS SOME DRYING OVER THE MOUNTAINS WEDNESDAY MORNING...LESS OVER THE PLAINS. BY WEDNESDAY AFTERNOON...MOISTURE INCREASES OVER THE PLAINS...THEN OVER THE MOUNTAINS BY LATE AFTERNOON. MOISTURE IS BETTER ON THE NAM WEDNESDAY NIGHT...THAN THE GFS. THERE IS A PRETTY DECENT THETA-E AXIS OVER CENTRAL COLORADO TUESDAY AND TUESDAY NIGHT. CROSS SECTIONS HAVE POTENTIAL INSTABILITY OVER THE WESTERN HALF OF THE FORECAST AREA TUESDAY AND TUESDAY NIGHT. THERE IS FAIR CAPE OVER THE MOUNTAINS AND FOOTHILLS LATE DAY TUESDAY...WITH JUST A BIT OVER SOME OF THE PLAINS. THE PAST COUPLE OF STORMS INCLUDED CONVECTION...IT IS THAT TIME OF YEAR. WILL INCLUDE COME THUNDER WITH THE POPS FOR LATE DAY TUESDAY/TUESDAY EVENING. THE QPF FIELDS HAVE A TAD OF MEASURABLE PRECIPITATION FOR THE MOUNTAINS AND FOOTHILLS LATE DAY TUESDAY. THIS CONTINUES TUESDAY NIGHT AND WEDNESDAY...ALSO INCLUDING SMALL AMOUNTS FOR THE WESTERN AND NORTHERN PLAINS. FOR WEDNESDAY NIGHT...THE GFS HAS DECENT AMOUNTS INDICATED FOR THE WESTERN TWO-THIRDS OF THE CWA...WHILE THE NAM HAS A TINY BIT OVER THE MOUNTAINS ONLY. FOR POPS...WILL GO WITH "CHANCES" IN THE MOUNTAINS TUESDAY AFTERNOON AND NIGHT. WILL DECREASE THEM WEDNESDAY...THEN GO BACK TO "CHANCE"S WEDNESDAY NIGHT. FOR THE PLAINS...20-30%S WILL DO FOR TUESDAY NIGHT THROUGH WEDNESDAY NIGHT. THE PLAINS SHOULD SEE ALL RAIN...EVEN DURING THE NIGHTS. CONCERNING A FIRE WEATHER THREAT...THE ONLY AREA THAT MAY MEET THE FIRE WEATHER WATCH PARAMETERS WOULD BE PARTS OF ELBERT AND LINCOLN COUNTIES ON TUESDAY MORNING BEFORE THE UPSLOPE GETS IN THERE. THE WINDS ARE MARGINAL AT THIS TIME THERE...SO WILL NOT GO WITH HIGHLIGHTS. FOR TEMPERATURES...TUESDAY'S HIGHS ARE 2.0-3.5 C WARMER THAN TODAY'S. WEDNESDAY'S HIGHS COOL OFF 5-10 C FROM TUESDAY'S HIGHS. FOR THE LATER DAYS...THURSDAY THROUGH SUNDAY ...MODELS HAVE AN UPPER TROUGH GETTING THROUGH THE CWA BY MID DAY THURSDAY...THEN VERY STRONG NORTHWESTERLY FLOW ALOFT IS PROGGED THROUGH SUNDAY. THERE IS A WEAK UPPER TROUGH TO MOVE DOWN IN THE FLOW ON SUNDAY. WILL LINGER SOME MINOR POPS ON THURSDAY...THEN DRY THROUGH SATURDAY. WILL PUT SOME MINOR POPS IN THE MOUNTAINS SATURDAY NIGHT AND SUNDAY. OF NOTE...BEWARE OF NORTHWESTERLY FLOW ALOFT...AS FAR AS POPS GO ANYWAY. && .AVIATION...VFR CONDITIONS AND LIGHT WINDS ARE EXPECTED THROUGH TONIGHT. && .BOU WATCHES/WARNINGS/ADVISORIES...NONE. && GIMMESTAD/RJK
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER CO 1118 AM MDT SUN APR 10 2011 COZ030>051-111200- 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- 1118 AM MDT SUN APR 10 2011 ...WINTER WEATHER ADVISORY FOR THE NORTHERN MOUNTAINS UNTIL 9 PM MDT THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT OCCASIONAL SNOW WILL CONTINUE ACROSS THE MOUNTAINS THROUGH THE EARLY EVENING...THEN DECREASE OVERNIGHT. ADDITIONAL SNOW ACCUMULATIONS OF 3 TO 7 INCHES CAN BE EXPECTED. NORTHWEST WINDS OF 20 TO 40 MPH ALONG WITH SOME GUSTS TO 50 MPH ABOVE TIMBERLINE WILL CREATE SOME BLOWING AND POOR VISIBILITIES OVER THE HIGHER MOUNTAIN PASSES. ACROSS THE PLAINS...ANOTHER BAND OF RAIN SHOWERS WILL MOVE ACROSS THE AREA... EXITING THE REGION DURING THE EVENING. SOME SNOW COULD BE MIXED AT TIME WITH THE RAIN...BUT NO ACCUMULATION WILL OCCUR. NORTHWEST WINDS OF 20 TO 40 MPH WILL DEVELOP ALONG THE FOOTHILLS AND SPREAD ACROSS THE PLAINS DURING THE AFTERNOON...WHICH WILL CONTINUE INTO THE EVENING. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY DRY AND WARMER WEATHER WILL RETURN TO THE OUTLOOK AREA ON MONDAY AND CONTINUE THROUGH TUESDAY AT LOWER ELEVATIONS UNDER A RIDGE OF HIGH PRESSURE. HOWEVER MOUNTAIN AREAS GENERALLY WEST OF THE CONTINENTAL DIVIDE WILL SEE SCATTERED SHOWERS AND EVEN A FEW THUNDERSTORMS RETURNING TUESDAY AFTERNOON IN ADVANCE OF AN UPPER LEVEL WEATHER SYSTEM RACING ACROSS THE GREAT BASIN. LOOK FOR A FEW OF THESE SHOWERS TO SPREAD TO THE PLAINS ON WEDNESDAY FOLLOWING THE PASSAGE OF A BACKDOOR COLD FRONT. SHOWERS WILL REMAIN IN THE FORECAST FOR THE OUTLOOK AREA THROUGH THURSDAY MORNING WITH PASSAGE OF THE LOW PRESSURE SYSTEM. BEYOND THAT...DRY AND WARMER CONDITIONS SHOULD RETURN FRIDAY AND SATURDAY WITH A STRONG HIGH PRESSURE RIDGE BUILDING IN FROM THE WEST. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT. HOWEVER... REPORTS OF SNOWFALL OR WIND GUSTS GREATER THAN 50 MPH WILL BE APPRECIATED. D-L/BAKER
The national radar mosaic for the moment the first event began.
3 winter weather. Local standard time, as filed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2011Every state in 2011This day in weather historyWarnings in Colorado, April 2011
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: 302497, 302498, 302499.