* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...West Central Yellowstone County in south central Montana... * WHEN...Until 545 AM MDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Rises in small streams and normally dry coulees. * ADDITIONAL DETAILS... - At 248 AM MDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Radar estimates between 1 and 2.5 inches of rain have fallen. - This includes the following streams and drainages... Razor Creek, Five Mile Creek, Twelve Mile Creek, Crooked Creek, South Fork Fivemile Creek, and Sevenmile Creek. Additional rainfall amounts up to 1 inch are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Billings Heights, Shepherd and Acton. - http://www.weather.gov/safety/flood

At 244 AM MDT, Doppler radar was tracking a strong thunderstorm near Worden, or 19 miles northeast of Billings, moving northeast at 25 mph. HAZARD...Wind gusts of 45 to 55 mph, nickel size hail and very heavy rainfall. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. Locations impacted include... Worden, Ballantine, Shepherd and Pompeys Pillar.

At 224 AM MDT, a severe thunderstorm was located near Opheim, moving northeast at 30 mph. HAZARD...60 mph wind gusts and quarter size hail. SOURCE...Radar indicated. IMPACT...Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees. Locations impacted include... Opheim, Port Of Opheim, Thoeny, Baylor, and Glentana.

* WHAT...West winds 20 to 30 mph with gusts up to 45 mph expected. * WHERE...Fort Peck Lake. * WHEN...From 2 PM Monday to midnight MDT Tuesday Night. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. * ADDITIONAL DETAILS...Waves as high as 5 feet.

* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...A portion of north central Montana, including the following areas, East Glacier Park Region, Eastern Glacier, Western Toole, and Central Pondera, Eastern Pondera and Eastern Teton, Eastern Toole and Liberty, Northern High Plains, Southern High Plains and Southern Rocky Mountain Front. * WHEN...From 3 PM MDT this afternoon through Tuesday morning. * IMPACTS...Excessive runoff may result in minor flooding of creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage areas. Rural gravel and dirt roads can become muddy and may become difficult to travel. Rock/debris slides are possible in the mountains. * ADDITIONAL DETAILS... - Thunderstorms today will be capable of producing 0.50 to 1 inch per hour rain rates. Periods of moderate to heavy rainfall will be possible Monday through Tuesday morning. Widespread 0.75 to 1.5 inches of rain have already fallen along the Rocky Mountain Front over the past 24 hours. Additional widespread rain accumulations of 1 to 3 inches are possible along the Rocky Mountain Front and Sweet Grass Hills with isolated 4 inches possible along and north of US Highway 2 this afternoon through Tuesday morning. - http://www.weather.gov/safety/flood