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Montana Severe Weather Hazards

Montana Severe Weather Hazards. Disaster Mitigation Stakeholders Meeting April 19 th , 2007. National Statistics. Montana Statistics. MT Average Severe Thunderstorm Reports by Month. Source SPC. Lightning Hazard: Northwest portion of the state with relatively few; maximum occurrence SE MT.

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Montana Severe Weather Hazards

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  1. Montana Severe Weather Hazards Disaster Mitigation Stakeholders Meeting April 19th, 2007

  2. National Statistics

  3. Montana Statistics

  4. MT Average Severe Thunderstorm Reports by Month Source SPC

  5. Lightning Hazard: Northwest portion of the state with relatively few; maximum occurrence SE MT. Montana ranks in top 10 nationally as far as deaths per capita Thunderstorm Flash Density (Bernhardt) Graphics courtesy Vasaila

  6. Tornados reported over 53 year period

  7. Greater than 2 inch hail reported over 53 year period

  8. Very strong wind events (red due to thunderstorms, blue not): Note Chinook zone

  9. Chinook Winds felt in the lee of the Rockies from Alberta south into Montana; strongest near Rocky Mountain Front (e.g. Glacier County)

  10. Flooding • Can be due to • Heavy rain and/or snowmelt • Ice jams • Dam failure (especially dangerous) • Most common problem: people attempting to cross flooded roadways and getting carried away

  11. Dams near high population areas

  12. Wintertime Severe Weather • Snow/ice and slippery roadways (car accidents) • Combination of snow and blowing snow creating blizzard conditions (mainly near and east of the divide) • Extreme cold/low wind chills (risk for people and livestock) • Avalanches

  13. Montana Ranks 5th in avalanche fatalities; had more this year

  14. Drought: have had wet and dry periods over the past century; currently in a dry period

  15. Annual Departure from Mean StreamflowMissouri River at Fort Benton

  16. Summary: Severe Weather Hazards • Severe thunderstorms (Hail, Wind, Tornadoes) • Lightning • Flooding due to heavy rain, ice jams, snowmelt, dam failure • Winter Weather (snow, ice, slick roads, extreme cold) • Mitigation: Educational outreach on preparedness; public alert radios in public buildings and in more homes • Stormready program

  17. Towns and Counties can become Stormready. • Elements: • 24 hour warning point • Public alert systems (sirens, NOAA weather radios, etc) • Periodic weather safety and spotter talks • Written hazardous weather action plan • Good information flow to and from the weather service

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