1 flash flood, 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 Great Falls, MT wrote its last area forecast discussion before the first event at Jul 31, 2:00 AM MST, 30 minutes earlier.
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 300 AM MDT TUE JUL 31 2001 A FLASH FLOOD WARNING IS CURRENTLY OUT FOR BURN AREAS. LAW ENFORCEMENT HAVE HAD NO REPORTS OF ANY FLOODING...BUT WITH POSSIBILITY OF HEAVY SHOWERS THRU THE MORNING...WILL CONTINUE THE WARNING UNTIL MID-DAY. CURRENT WATER VAPOR SHOT SHOWS TROF OVER ID PAN HANDLE. ETA MOVES THIS TROF FAIRLY RAPIDLY...OVER SW MT BY 12Z...ERN MT BY 00Z WED. TROF WILL BE OUT OF THE STATE WITH EVEN ERN MT UNDER WEAK RIDGING BY 12Z WED. SOME INSTABILITY REMAINS TODAY ACROSS THE NORTHERN ZONES AND DAKOTAS...BY WED ENTIRE STATE SHOULD BE RELATIVELY STABLE. FEATURES LINE UP WELL...COOLING ALOFT FROM TROF PASSAGE WILL BE ABOUT 3-4 DEGREES...7H SHOWS FORECASTED CLOSED CIRCULATION AT 12Z...AND CIRCULATION HOLDS TOGETHER AS THE TROF MOVES EAST. ALSO E-W 850/SFC BOUNDARY ACROSS CENTRAL MT AND SHOULD CONTINUE TO GENERATE GOOD SURFACE CONVERGENCE. ALSO HAVE PRETTY HEALTHY DEWPOINTS ACROSS THE STATE...UPPER 40S AND 50S ARE PRETTY COMMON. WILL GO WITH HIGH POPS TODAY...CENTRAL AND NORTHERN ZONES. IN THE SW...DRYING DURING THE DAY ALTHOUGH AIRMASS SHOULD SUPPORT SHOWERS THRU THE DAY. EXTENDED....UKMET HAS TROF OVER ERN PAC...ECMWF HAS IT OVER OR/WA/NRN CA....AND NEW MRF DELAYS TROF APPROACHING ZONES THIS WEEKEND. DISLIKE UPDATING BASED ON A CHANGE IN A SINGLE RUN HOWEVER NEW RUN IS MORE CONSISTENT WITH ECMWF AND RIDGE COULD DELAY CHANCE OF THUNDERSTORMS. HOWEVER...WITH SOUTHWEST FLOW AND INCREASING SURFACE TEMPS...CONVECTION IS NOT OUT OF THE QUESTION AS EARLY AS SATURDAY. ZELZER CCF NUMBERS GTF RB 064/048 078/051 084 13911 CTB RB 063/Y046 075/050 076 13921 HLN WU 066/045 080/048 086 13611 BZN WB 070/042 080/046 081 13511 WEY WB 066/032 072/034 074 13511 DLN WB 065/042 078/046 081 13411 HVR RU 065/050 080/052 085 13931 LWT WB 062/045 075/047 077 13811
The national radar mosaic for the moment the first event began.
1 flash flood. Local standard time, as filed.
Actual event location is Cave Creek (approximately 20 E of Helena - Cave Creek is the creek that runs down Cave Gulch where soil was scorched by wildfire in 2000)...Driveway washed out by flowing water and mud...Monetary damage unknown.
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: 5261012.