1 lightning, 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 Jul 24, 2:00 PM MST, 5 hours 30 minutes earlier.
NORTHEAST AND NORTH CENTRAL COLORADO AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER COLORADO 300 PM MDT TUE JUL 24 2001 MDLS SHW THE FLO OF TROPICAL MONSOONAL MOISTURE FM MEX ACRS NM INTO CNTRL RCKYS WILL CONTINUE THRU PRD. BOTH NGM AND MESOETA SHW PRECIPITIBLE WATERS OVR AN INCH ALG WITH HI CAPES. NGM HAS THE HIEST CAPES LATE THIS AFTN AND AGN ON WED AFTN. MDLS ALSO KEEP LO LVL UPSLP FLO OVR HI PLAINS WHICH WILL KEEP AMS MOIST AT ALL LVLS. ALSO WK SHT WV WILL ADD TO INSTBLTY THIS EVE. WILL MENTION PSBL SVR ALG WITH PSBL HVY RAIN OVR NERN PLAINS THIS EVE. ANOTHER APPARENT SHT WV WED NGT BUT FCST UPR AIR SOUNDINGS WERE NOT AS SATURATED AS THIS EVE. ON THU NGT MDLS START TO MOVE WK UPR TROF ACRS AREA...SO WILL INCRS POPS TO LIKELY MNLY E OF MTNS. WK LO LVL UPSLP FLO WILL PERSIST GNLY THRU PRD. LTL CHNG XPCTD IN TEMPS BUT WITH HIR SFC DWPTS OVR HI PLAINS MIN TEMPS WILL BE LTL WRMR THAN MOS TEMP GDNC. GENLY FVR MESOETA FCST SFC TEMPS FOR MAX TEMPS OVR SUMWHT COOLER MOS TEMP GDNC. IN XTNDD PRD...MRF MOVES STG SHT WV ACRS STA ON FRI AS ANOTHER SYS WILL PRODUCE A GUD UPR TROF OVR PAC NW AND STG SHT WV MOVG ACRS NRN RCKYS ON SAT. DRIER WLY FLO ALF STARTING ON SUN WILL SHUNT TROPICAL MONSOONAL MSTR TO THE S BUT WITH PERSISTENT LO LVL UPSLP FLO E OF MTNS WILL KEEP THRT OF LATE DAY CONVECTION IN THRU PRD. TEMPS WILL BE NR OR BLO SEASONAL NORMS. GARD...WFOp BOULDER .DEN...NONE.
The national radar mosaic for the moment the first event began.
1 lightning. Local standard time, as filed.
A thunderstorm knocked out power to 1500 residents in Denver metropolitan area.
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, July 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: 5267382.