Montana, 2019

Heavy Rain in Montana, September 8 to 9, 2019

September 8 to 9, 2019 · NWS MSO · 1 event in 1 county or zone

A large low pressure system that tapped subtropical moisture brought an extensive area of heavy rain to Northwest Montana.

Where it happened

Every event with a place to put it. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
1

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.

What happened

The episode as NWS MSO wrote it up.

A large low pressure system that tapped subtropical moisture brought an extensive area of heavy rain to Northwest Montana.

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

1 heavy rain. Local standard time, as filed.

Heavy Rain, Lake

When
September 8, 4:30 PM MST to September 9, 7:00 PM MST
Where
Lake County, 5.79 mi ENE of Polson to 41.46 mi N of Rollins
Reported by
COOP Observer
Coordinates
47.705, -114.051

General rainfall of 1 to 2 inches fell across parts of the Flathead and Mission valleys eastward to the Continental Divide. Heavier amounts of 3 to 4 inches fell locally on the east side of Flathead Lake and in the Mission Mountains, which were near record 2-day totals for the month of September. Also, minor debris flows were noted on Hwy 35 between Bigfork and Polson with some water into the Bigfork after-school building.

What these are

Heavy Rain
Rainfall totals unusual for the place and season that did not produce a flood.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Montana in 2019Every state in 2019This day in weather historyWarnings in Montana, September 2019

Sources

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 2026-10-01. Each event’s entry at NCEI: 850250.