1 thunderstorm wind, as filed by the National Weather Service.
Every event with a place to put it. 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 Great Falls, MT wrote its last area forecast discussion before the first event at Jul 17, 2:00 PM MST, 55 minutes earlier.
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 300 PM MDT TUE JUL 17 2001 GENERAL PATTERN CONTINUES OF LOW PRESSURE CENTER OVER SOUTHERN BC/ALTA WITH TROF EXTENDING SOUTH OVER PACIFIC NORTHWEST. AIRMASS IS UNSTABLE CENTRAL THROUGH SOUTHERN CWA. WEAK SHORTWAVE IS AGAIN MOVING THROUGH SOUTHWEST FLOW ALOFT...AND ANOTHER AREA OF DIFLUENCE ALOFT OVER SOUTHWEST AND CENTRAL MT. RELATIVELY LOW CONVECTIVE TEMPERATURES THIS AFTERNOON ACROSS THE CWA AND SW MT IS ALREADY SHOWING CONVECTION...SO SOMEWHAT WET FORECAST FOR THIS EVENING. AIRMASS DRIES SLIGHTLY BY WEDNESDAY ALTHOUGH ATMOSPHERE REMAINS UNSTABLE OVER SOUTHERN CWA...AND NORTHERN CWA NEUTRAL TO STABLE. WILL CONTINUE WITH ISOLATED POPS OVER MOST AREAS THRU THURSDAY FOR AFTERNOON CONVECTION. ZELZER EXTENDED... UPPER LEVEL TROUGH OVER PACIFIC NW CONTINUES TO BRING A MOIST AND UNSTABLE SOUTHWEST FLOW ALOFT OVER AREA DAYS 3 AND 4. BY DAY 5... MODELS DO DIFFER IN DETAILS OF TROUGH PACIFIC NW. MRF/ECMWF BRINGS IN WEAK UPPER RIDGE OVER AREA. WHILE NEW AVN SWINGS SHORT WAVE ACROSS AREA. BY DAY 6...ECMWF HAS HIGHER AMPLITUDE RIDGE OVER ERN MONTANA. OVERALL...IT WILL BE COOL AND UNSETTLED AT FIRST WITH WARMER CONDITIONS AND PRECIP DECREASING TO ISOLATED DURING THE LAST HALF OF PERIOD. WILLIAMSON DC CCF NUMBERS GTF BB 049/079 050/080 051 13311 CTB BB 045/075 046/075 048 13211 HLN EB 049/078 049/080 05 0 13522 BZN EE 048/076 048/078 048 13622 WEY EE 042/072 042/074 042 13622 DLN EB 045/074 045/076 048 13321 HVR BB 056/085 056/088 056 13311 LWT EB 050/076 048/078 052 13522
The national radar mosaic for the moment the first event began.
1 thunderstorm wind. Local standard time, as filed.
Reported by Air Force personnel assigned to missile site affiliated with Malmstrom AFB.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2001Every state in 2001This day in weather historyWarnings in Montana, 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: 5260929.