1 high wind, as filed by the National Weather Service.
Every event with a place to put it; 1 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 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 May 9, 2:40 AM MST, 4 hours 50 minutes earlier.
NORTHEAST AND NORTH CENTRAL COLORADO AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER COLORADO 340 AM MDT WED MAY 9 2001 SHORT TERM DISCUSSION...WK SHT WV IN ZNL FLO ALF WILL MOVE ACRS AREA THIS AFTN AT MAX HEATING TIME...SO WILL GO WITH ISOLD POPS ON PLAINS AND SCT MTNS FOR LATE DAY SHWRS AND TSTMS EVEN THOUGH CAPES ARE LO ON NGM AND OVRDONE ON MESOETA DUE TO TOO HI DWPTS. ALL MDLS SHW A GUD AMT OF MID AND HI LVL MSTR BY ARND MIDDY AND STLT LOOP CONFIRMS THIS MSTR MOVG INTO AREA. BOTH AVN AND NGM MOS TEMP GDNC HAVE BEEN TOO HIGH LAST FEW DAYS SO WILL UNDERCUT THEM AND GO WITH MDLS H7 TEMPS REDUCED TO SFC. WHILE OVRNGT LO TEMPS WILL BE HIR AFTN CLDS AND PCPN WILL INHIBIT HEATING LATE. GARD...WFO BOULDER LONG TERM DISCUSSION: WEAK UPPER TROUGH PUSHES ACROSS THE FORECAST AREA FROM 00Z TO 06Z THIS EVENING WITH JET LEVEL FLOW BECOMING NORTHWESTERLY. LATEST MODEL GRIDS SHOW LESS OF AN EFFECT ON THE SURFACE FEATURES WITH THIS AS THEY DID ON YESTERDAY MORNINGS RUNS. NOW IT DOES NOT EVEN LOOK LIKE THERE WILL BE A FRONT AT ALL FOR THIS EVENING. THERE IS ENOUGH MOISTURE AROUND THIS EVENING AND SOME POTENTIAL INSTABILITY. BUT THE LAPSE RATES ARENT GREAT AT THE MID LEVELS...AND THE DIV-Q GRIDS SHOW WEAK SYNOPTIC SCALE DESCENT. WILL PUT SOME LIMITED POPS IN OVER THE PLAINS EARLY. OVERNIGHT THE MOISTURE GRIDS SHOW SOME MIDDLE AND UPPER LEVEL MOISTURE ADVECTING ACROSS THE FORECAST AREA. THIS SEEMS REASONABLE LOOKING AT THE SATELLITE PICTURES UPSTREAM. WILL NOT TOTALLY CLEAR IT OUT OVERNIGHT. ON THURSDAY...CROSS SECTIONS SHOW STEEPER LAPSE RATES ...DECENT POTENTIAL INSTABILITY AND BETTER LOW LEVEL MOISTURE THEN THIS EVENING. THERE IS EVEN A THETA-E AXIS OVER THE NORTHEAST CORNER AND AS A RESULT CAPES ARE 1500-2200 JOULES/KG CAPE FROM 18-00Z THURSDAY AFTERNOON. ANOTHER WEAK UPPER TROUGH IS PROGGED ACROSS US FROM 00Z-06Z THURSDAY EVENING. AGAIN GRIDS ADVERTISE ANOTHER SURFACE FRONT AND UPSLOPE BEHIND IT FOR THE REST OF THE THURSDAY NIGHT. WELL SEE. CURRENT ZONES DO HAVE POPS IN ALREADY FOR THURSDAY AFTERNOON/EVENING...WILL MAKE PICAYUNE CHANGES ONLY. FOR TEMPERATURES...GRIDS SHOW A 1.5 TO 2.5 C WARM-UP FRO THURSDAY HIGHS COMPARED TO THIS AFTERNOON EXPECTED READINGS. IN THE EXTENDED PERIOD...GRIDS SHOW SOME UPSLOPE CONTINUING ON FRIDAY WITH ENOUGH MOISTURE AROUND TO KEEP THE MENTION OF A CHANCE IN. FROM SATURDAY THROUGH TUESDAY UPPER RIDGE AXIS RIGHT OVER THE FORECAST AREA WITH VERY MOISTURE AROUND. WILL LEAVE EXTENDED PRETTY MUCH ALONE. RJK .DEN...NONE.
The national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
High winds in excess of 60 mph (53 kts), toppled at least 1000 trees about 4 1/2 miles east of County Road 8 near Fraser. The area was 20 to 25 yards wide and extended about 1/2 mile in length.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2001Every state in 2001This day in weather historyWarnings in Colorado, May 2001
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: 5250062.