1 thunderstorm wind, as filed by the National Weather Service.
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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 13, 1:42 PM MST, 2 hours 48 minutes earlier.
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 242 PM MDT FRI JUL 13 2001 SYNOPSIS...THUNDERSTORMS EXPECTED ACROSS CWA THIS EVENING WITH SEVERE THUNDERSTORM WATCHES IN EFFECT UNTIL 700 PM MDT. SCATTERED THUNDERSTORMS WILL DEVELOP AGAIN SATURDAY AFTERNOON. LITTLE CHANGE EXPECTED IN TEMPERATURES. DISCUSSION...PERSISTENT HIGH PRESSURE RIDGE CENTERED OVER THE SOUTHERN CONUS WITH A LOW PRESSURE TROUGH OFF THE WEST COAST. RESULTANT SOUTHWEST FLOW OF MOIST...UNSTABLE AIR INTO CWA CREATING THUNDERSTORMS AGAIN THIS AFTERNOON WITH POSSIBILITY OF SEVERE THUNDERSTORMS. DYNAMICS IN PLACE...LARGE AREA OF LOWER LEVEL CONVERGENCE COUPLED WITH UPPER LEVEL DIVERGENCE CENTERED OVER CWA... DISTURBANCE PUSHING THROUGH...JET MAX PASSING OVER...NEGATIVE LI/S BLANKETING CWA WITH AREAS BETWEEN -4 AND -6...CAPES 1000 J/KG AND HIGHER...AND TIME SECTIONS SHOWING STRONG OMEGA AROUND 00Z. FORECASTED SOUNDINGS ADVERTISE PRECIPITABLE WATER INCREASING FROM AROUND THREE/QUARTERS OF AN INCH THIS MORNING TO OVER AN INCH THROUGH THE EVENING. SOME THUNDERSTORMS EXPECTED TO CREATE STRONG WIND...HAIL AND HEAVY RAIN...THUS TWO SEVERE THUNDERSTORM WATCHES HAVE BEEN ISSUED FOR THE CWA. ACTIVITY FOR CWA SHOULD DIMINISH AFTER SUNSET AS DISTURBANCES PUSH INTO EASTERN MT AND DYNAMICS WEAKEN. LITTLE CHANGE IN PATTERN SATURDAY...WITH SOUTHWEST FLOW CONTINUING. DYNAMICS NOT QUITE AS IMPRESSIVE HOWEVER...AND WILL PUT POPS IN SCATTERED CATEGORY. MOS GUIDANCE WANTS TO COOL TEMPERATURES SEVERAL DEGREES SATURDAY. THOUGH FLOW SLIGHTLY MORE WESTERLY DO NOT EXPECT MUCH CHANGE AND WILL KEEP FORECASTS WITHIN A DEGREE OR TWO OF TODAY. .EXTENDED... ALL OF THE EXTENDED MODELS SUGGEST LITTLE CHANGE TO THE PATTERN MONDAY THROUGH NEXT FRIDAY. AN UPPER LOW REMAINS PARKED OVER THE PAC NORTHWEST AND SOUTHERN BC THRU WED THEN BEGINS SLOWLY FILLING AND LIFTING NORTHEAST. HOWEVER...FLOW CONTINUES TO BE OUT OF THE SOUTHWEST TOWARDS THE END OF THE WEEK. THEREFORE... EXPECT SCATTERED THUNDERSTORMS THRU PERIOD WITH NEAR NORMAL TEMPS. MIELKE CCF NUMBERS GTF TB 054 084 053 083 054 036334 CTB TB 051 083 050 083 051 035223 HLN zTT 056 085 055 086 055 036345 BZN TT 050 085 051 086 051 036345 WEY TT 053 078 046 080 048 036345 DLN TT 051 084 050 085 050 034344 HVR TB 058 088 059 087 058 036222 LWT TB 054 084 054 085 053 036344
The Great Falls radar (KTFX), 109 km away, was scanning. The volume nearest the first event began at 23:31 UTC.
1 thunderstorm wind. Local standard time, as filed.
Actual spotter location Helena 8 N...Street signs blown over...Shingles blown off roof...Trees blown down...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: 5261091.