A of broad low pressure area over the Pacific Northwest exerted an influence on Montana's weather for much of the weekend. This resulted in a persistent unstable southwest flow over the region, which pumped in mid and upper level moisture along with passing disturbances embedded within the flow.  In the upper levels, a jet stream  was situated in a favorable position to produce upper level divergence.  Meanwhile, a low level easterly flow was present for a significant period of time, which further increased moisture levels and wind shear. During the peak of this event, precipitable water values approached the one inch mark, effective wind shear values were as high as 50kts, and mid-level lapse rates soared to 7.5 to 8 degree C per Kilometer. The combination of these conditions provided an environment primed for a weekend of severe thunderstorms for much of the region.

Hail in FERGUS, MONTANA
From 14-JUL-19 16:30:00 to 14-JUL-19 16:30:00 (MST-7)
Location: BUFFALO
Magnitude: 1.25 
Reported by: Public

Public reports a few half dollar sized hail that occurred with an estimated 60 mph wind gust. A horse trailer was blown over.

Thunderstorm Wind in FERGUS, MONTANA
From 14-JUL-19 16:30:00 to 14-JUL-19 16:30:00 (MST-7)
Location: BUFFALO
Magnitude: 52.00 EG
Reported by: Public

Public reported an estimated wind gust of 60 mph that blew over a horse trailer.

Hail in JUDITH BASIN, MONTANA
From 14-JUL-19 16:40:00 to 14-JUL-19 16:40:00 (MST-7)
Location: HOBSON
Magnitude: 1.00 
Reported by: Trained Spotter

Trained spotter reported 1 inch sized hail.

Heavy Rain in JUDITH BASIN, MONTANA
From 14-JUL-19 16:40:00 to 14-JUL-19 16:40:00 (MST-7)
Location: HOBSON
Reported by: Trained Spotter

Trained spotter reported .74 inches of rain in about 20 minutes.

Thunderstorm Wind in FERGUS, MONTANA
From 14-JUL-19 16:55:00 to 14-JUL-19 16:55:00 (MST-7)
Location: (LWT)LEWISTON MUNI A
Magnitude: 59.00 MG
Reported by: ASOS

Thunderstorm Wind in FERGUS, MONTANA
From 14-JUL-19 17:00:00 to 14-JUL-19 17:00:00 (MST-7)
Location: LEWISTOWN
Magnitude: 61.00 EG
Reported by: Trained Spotter

Trained spotter estimates 70 mph wind gust. Heavy rain and hail were falling at the time of observation.

Thunderstorm Wind in HILL, MONTANA
From 14-JUL-19 17:09:00 to 14-JUL-19 17:09:00 (MST-7)
Location: HAVRE
Magnitude: 80.00 MG
Reported by: Mesonet

Thunderstorm Wind in FERGUS, MONTANA
From 14-JUL-19 17:22:00 to 14-JUL-19 17:22:00 (MST-7)
Location: FORESTGROVE
Magnitude: 56.00 MG
Reported by: AWOS

Funnel Cloud in BROADWATER, MONTANA
From 14-JUL-19 19:20:00 to 14-JUL-19 19:20:00 (MST-7)
Location: TOWNSEND
Reported by: Trained Spotter

Trained spotter reported a funnel cloud in Townsend.

Hail in BROADWATER, MONTANA
From 14-JUL-19 19:40:00 to 14-JUL-19 19:40:00 (MST-7)
Location: WINSTON
Magnitude: 1.75 
Reported by: Public

Public reported hail sized 1.75 inches near Winston.

Heavy Rain in FERGUS, MONTANA
From 14-JUL-19 21:05:00 to 14-JUL-19 21:05:00 (MST-7)
Location: FORESTGROVE
Reported by: Public

Heavy rain of .83 inches reported on the north slope of the snowy Mountains. Location estimated.

Hail in JEFFERSON, MONTANA
From 12-JUL-19 17:15:00 to 12-JUL-19 17:15:00 (MST-7)
Location: WHITEHALL
Magnitude: 1.50 
Reported by: Trained Spotter

Trained spotter reported 1.5 inch hail in Whitehall.

Hail in FERGUS, MONTANA
From 13-JUL-19 15:34:00 to 13-JUL-19 15:34:00 (MST-7)
Location: LEWISTOWN
Magnitude: 1.00 
Reported by: Public

One inch sized hail reported near Lewistown.

Hail in BROADWATER, MONTANA
From 14-JUL-19 15:35:00 to 14-JUL-19 15:35:00 (MST-7)
Location: TOWNSEND
Magnitude: 1.25 
Reported by: Trained Spotter

Trained spotter reported hail sized 1.25 inches in Townsend.

Hail in CASCADE, MONTANA
From 14-JUL-19 15:32:00 to 14-JUL-19 15:32:00 (MST-7)
Location: BLACK EAGLE
Magnitude: 1.00 
Reported by: Public

Public reported hail size of 1 inch near Black Eagle.

Hail in CASCADE, MONTANA
From 14-JUL-19 15:22:00 to 14-JUL-19 15:22:00 (MST-7)
Location: MANCHESTER
Magnitude: 1.00 
Reported by: Trained Spotter

Trained spotter reported 1 inch sized hail at 1 W Sun Prairie.

Hail in BROADWATER, MONTANA
From 12-JUL-19 19:00:00 to 12-JUL-19 19:00:00 (MST-7)
Location: WINSTON
Magnitude: 1.50 
Reported by: Trained Spotter

Trained spotter reported 1.5 inch hail near Winston. Pictures and video were provided.

Hail in TETON, MONTANA
From 13-JUL-19 13:53:00 to 13-JUL-19 13:53:00 (MST-7)
Location: DUTTON
Magnitude: 1.00 
Reported by: Other Federal Agency

One inch sized hail reported near Dutton.

Thunderstorm Wind in FERGUS, MONTANA
From 13-JUL-19 15:27:00 to 13-JUL-19 15:27:00 (MST-7)
Location: LEWISTOWN
Magnitude: 57.00 MG
Reported by: ASOS

Heavy Rain in FERGUS, MONTANA
From 13-JUL-19 15:33:00 to 13-JUL-19 15:33:00 (MST-7)
Location: LEWISTOWN
Reported by: Public

Brief heavy rainfall of .43 inches in 13 minutes, with pea sized hail. Some tree branches were knocked down during the storm.

Thunderstorm Wind in FERGUS, MONTANA
From 13-JUL-19 15:52:00 to 13-JUL-19 15:52:00 (MST-7)
Location: HILGER
Magnitude: 53.00 MG
Reported by: Mesonet

Thunderstorm Wind in BLAINE, MONTANA
From 13-JUL-19 17:18:00 to 13-JUL-19 17:18:00 (MST-7)
Location: FT BELKNAP
Magnitude: 53.00 MG
Reported by: RAWS

Thunderstorm Wind in CASCADE, MONTANA
From 14-JUL-19 15:24:00 to 14-JUL-19 15:24:00 (MST-7)
Location: MANCHESTER
Magnitude: 72.00 MG
Reported by: Mesonet

Thunderstorm Wind in CASCADE, MONTANA
From 14-JUL-19 15:27:00 to 14-JUL-19 15:27:00 (MST-7)
Location: GREAT FALLS
Magnitude: 52.00 EG
Reported by: NWS Employee

Tree limbs about three inches in diameter were downed by thunderstorm winds.

Thunderstorm Wind in BROADWATER, MONTANA
From 14-JUL-19 15:30:00 to 14-JUL-19 15:30:00 (MST-7)
Location: TOWNSEND
Magnitude: 52.00 EG
Reported by: Law Enforcement

Sheriff's office reports a tree limb down on a power line.

Thunderstorm Wind in CASCADE, MONTANA
From 14-JUL-19 15:30:00 to 14-JUL-19 15:30:00 (MST-7)
Location: (GTF)GREAT FALLS ARPT
Magnitude: 53.00 MG
Reported by: ASOS

Thunderstorm Wind in CASCADE, MONTANA
From 14-JUL-19 15:30:00 to 14-JUL-19 15:30:00 (MST-7)
Location: GREAT FALLS
Magnitude: 52.00 EG
Reported by: Department of Highways

Power lines down and blocking south bound lane of interstate 15 at miler marker 281.6.

Thunderstorm Wind in CASCADE, MONTANA
From 14-JUL-19 15:39:00 to 14-JUL-19 15:39:00 (MST-7)
Location: MALMSTROM AFB
Magnitude: 56.00 MG
Reported by: Mesonet

Thunderstorm Wind in CASCADE, MONTANA
From 14-JUL-19 15:40:00 to 14-JUL-19 15:40:00 (MST-7)
Location: BLACK EAGLE
Magnitude: 52.00 EG
Reported by: NWS Employee

Reports of a tree split and power line down near 19th St and Central. Several other limbs were down in the vicinity. Also, there were 5 to 6 inch diameter tree limbs down near 22nd Ave and Central.

Thunderstorm Wind in CASCADE, MONTANA
From 14-JUL-19 16:00:00 to 14-JUL-19 16:00:00 (MST-7)
Location: ULM
Magnitude: 52.00 EG
Reported by: Trained Spotter

Power was knocked out as thunderstorms approached from the west.

Hail in CHOUTEAU, MONTANA
From 14-JUL-19 16:05:00 to 14-JUL-19 16:05:00 (MST-7)
Location: HIGHWOOD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported hail sized 1 inch near Highwood. Report relayed by NWS Chat.

Thunderstorm Wind in CHOUTEAU, MONTANA
From 14-JUL-19 16:17:00 to 14-JUL-19 16:17:00 (MST-7)
Location: WARRICK
Magnitude: 54.00 EG
Reported by: Trained Spotter

Siding blown off of a shed and some limbs down on the roof of the house. Some hail damage to crops also reported but hail size was not verified. Time estimated by radar.