A couple of disturbances separated by brief shortwave ridging provided a four day stretch of wet weather for much of the region. The first system moved into southwest Montana on Friday, September 6th, 2019 and brought a brief period of strong to severe thunderstorms to the southwest followed by heavy rains, with some expansion into central and the eastern portions of North-central Montana. The second system moved toward the area by Sunday September 8th, 2019 and featured more general moderate to heavy rains over the Rocky Mountain Front and portions of Central Montana. Precipitable water values exceeded the one inch mark at times and rarely fell below .7 inches throughout this event. At the surface, a frontal system became nearly stationary and became an impetus for precipitation. The severe weather in the southwest was mostly driven by instability along with lift from the stalled frontal system and the first disturbance, while the second was largely influenced by easterly upslope winds.

Thunderstorm Wind in BEAVERHEAD, MONTANA
From 06-SEP-19 15:19:00 to 06-SEP-19 15:19:00 (MST-7)
Location: WISE RIVER
Magnitude: 51.00 MG
Reported by: Mesonet

A 59 mph (51 kt) thunderstorm wind gust was reported at the Beaverhead Deerlodge mesonet station.

Heavy Rain in BEAVERHEAD, MONTANA
From 06-SEP-19 16:15:00 to 06-SEP-19 16:15:00 (MST-7)
Location: GRANT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported .65 inches of rain at 5 SSE of Grant. Radar estimates that the rainfall fell within a 45 minute period.

Heavy Rain in JEFFERSON, MONTANA
From 09-SEP-19 06:19:00 to 09-SEP-19 06:19:00 (MST-7)
Location: CLANCY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A rainfall total of 1.36 inches was reported by the public at 2 SE Montana City. Rainfall total began on the evening of Sunday, September 8th.

Heavy Rain in JEFFERSON, MONTANA
From 09-SEP-19 20:35:00 to 09-SEP-19 20:35:00 (MST-7)
Location: CLANCY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported a rainfall total of 2.25 inches at 2 N Clancy from September 6th through the 9th.

Heavy Rain in LEWIS AND CLARK, MONTANA
From 09-SEP-19 21:02:00 to 09-SEP-19 21:02:00 (MST-7)
Location: HELENA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A rainfall total of 2.22 inches was reported by the public at 10 NNE East Helena. Rainfall total began on the evening of Friday, September 6th and ended Monday evening, September 9th.

Heavy Rain in BEAVERHEAD, MONTANA
From 06-SEP-19 17:00:00 to 06-SEP-19 17:00:00 (MST-7)
Location: MONIDA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A mesnoet station at Lima Reservoir recorded 1.07 inches of rain.

Heavy Rain in LEWIS AND CLARK, MONTANA
From 07-SEP-19 07:50:00 to 07-SEP-19 07:50:00 (MST-7)
Location: HELENA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A COCORAHS station at 2 NW of Helena reported 1 inch of rain.

Thunderstorm Wind in BEAVERHEAD, MONTANA
From 06-SEP-19 14:47:00 to 06-SEP-19 14:47:00 (MST-7)
Location: GRANT
Magnitude: 62.00 MG
Reported by: Mesonet

A 71 mph (62 kt) thunderstorm wind gust was reported the Brenner Raws mesonet station.

Funnel Cloud in BEAVERHEAD, MONTANA
From 06-SEP-19 15:15:00 to 06-SEP-19 15:15:00 (MST-7)
Location: DILLON
Reported by: Trained Spotter

A funnel cloud was videotaped by a trained spotter at 4 WSW Dillon.

Heavy Rain in LEWIS AND CLARK, MONTANA
From 09-SEP-19 05:20:00 to 09-SEP-19 05:20:00 (MST-7)
Location: HELENA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter at 2 SE Helena reported a 24 hour total rainfall 1.8 inches, based on surrounding observations, most of it fell since 4PM September 8th.

Heavy Rain in LEWIS AND CLARK, MONTANA
From 09-SEP-19 05:43:00 to 09-SEP-19 05:43:00 (MST-7)
Location: HELENA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter at 11 W Helena reported 1.19 inches of rain since 7PM September 8th, and a three day total of 1.96 inches.