1 hail, 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 23, 2:00 PM MST, 1 hour 56 minutes earlier.
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 300 PM MDT MON JUL 23 2001 POSITIVELY TILTED UPPER TROUGH IS FORECAST BY THE MODELS TO EXTEND FROM NW MT TO ERN OREGON AT 00Z TUE. NRN PORTION OF THE UPPER TROUGH WILL WORK ITS WAY THROUGH THE NRN ZONES TONIGHT AND THROUGH THE SRN ZONES LATER TONIGHT AND EARLY TUE MORNING. TUE NIGHT A SHORTWAVE EMBEDDED IN A WLY FLOW ALOFT IS FORECAST BY THE MODELS TO SKIRT THE NRN ZONES. FOR WED WSW FLOW ALOFT IS OVER AREA. AN EVEN WEAKER SHORTWAVE MAY AFFECT THE NRN ZONES WHILE THE AVN HAS A SHORTWAVE AFFECTING THE FAR SRN ZONES. CHECK OF CROSS SECTIONS SHOWS A FAIRLY DRY AIRMASS AND WITH FLOW ALOFT GENERALLY WLY DO NOT SEE MUCH THREAT FOR PRECIPITATION AFTER TONIGHT. A SHORTWAVE OVER SW MT AT 18Z MON WL MOV INTO S CENTRAL MT LATER MON AFTERNOON. MODELS INDICATE A FAIRLY UNSTABLE AIRMASS OVER SW AND CENTRAL MT WITH CAPES ROUGHLY IN THE 500 JOULES/KG RANGE. WILL GO WITH 20 AND 30 PCT RANGE FOR THIS AREA. FOR TUE ETA/AVN HAVE A SURFACE CONVERGENCE AXIS OVER CENTRAL MT WITH LIFTED INDICES OF MINUS 2 AS FAR W AS NEAR HVR/LWT. WILL GO WITH A SLIGHT CHANCE OF SHOWERS OR THUNDERSTORMS FOR BLAINE AND FERGUS COUNTIES. TO MAKE A MORE SEAMLESS FORECAST WITH BIL WILL MENTION A SLIGHT CHANCE OF SHOWERS/THUNDERSTORMS FOR GALLATIN COUNTY. FOR WED ETA KEEPS THE THREAT OF THUNDERSTORMS EAST OF THE FORECAST AREA BUT AVN HAS MINUS 2 LIFTED INDEX ISOPLETH OVER FERGUS COUNTY WITH SURFACE CONVERGENCE AXIS FROM BZN TO GTF TO W OF HVR. CONSENSUS AMONGST THE FORECASTERS WAS TO GO WITH THE ETA SOLUTION SO WILL GO DRY. EXTENDED...CWA COMES UNDER THE INFLUENCE OF A WESTERLY FLOW ALOFT DURING THE FIRST PART OF THE EXTENDED FORECAST. CONTINUED CHANCE OF PRECIPITATION DAY 3...PRIMARILY OVER THE EASTERN PORTION OF THE CWA. BY DAY 4 FLOW ALOFT BACKS A BIT AS UPPER TROF BEGINS TO APPROACH THE WEST COAST. ENOUGH OF A DOWNSLOPE TO FEND OFF MOST PRECIPITATION.UPPER TROF SWINGS INLAND DAY 5 WITH INCREASING SOUTHWEST FLOW ALOFT. SURFACE GRADIENTS INDICATE MODERATE WEST WINDS WHICH SHOULD INHIBIT ANY PRECIPITATION NEAR THE MOUNTAINS. TROF WEAKENS AS IT PUSHES ALONG THE CANADIAN BORDER DAY 6 WITH CONTINUED MODERATE WESTERLY WINDS AT THE SURFACE. DAY 7 LOOKS DRY AND COOLER WITH A RETURN TO ZONAL FLOW ALOFT. CCF NUMBERS GTF BB 052/082 052/082 052 04211 CTB BB 048/078 048/078 048 04111 HLN BB 052/082 053/082 052 04311 BZN BB 049/082 049/082 048 04211 WEY BB 038/078 038/078 040 04221 DLN BB 047/079 047/079 047 04211 HVR BB 054/085 055/083 054 04111 LWT BB 050/080 050/080 050 04321
The national radar mosaic for the moment the first event began.
1 hail. Local standard time, as filed.
Actual event location Martinsdale 10 N...Slight damage to automobiles (monetary amount of 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: 5261002.