Scattered showers and thunderstorms have developed early this afternoon across Teton County and Yellowstone National Park and are expected to continue through at least 4 PM MDT. Showers and thunderstorms will produce rainfall amounts from one tenth to one quarter of an inch with up to one half of an inch in a few stronger thunderstorms. Stronger thunderstorms will also be accompanied by wind gusts to 35 mph...frequent lightning and small hail.
Forecast for Yellowstone National Park
Updated: 3:43 PM MDT on July 4, 2009
Late This Afternoon
Mostly cloudy with scattered thunderstorms. Some thunderstorms may produce gusty winds...small hail and heavy rainfall. Highs 61 to 69. Chance of thunderstorms 50 percent.
Tonight
Mostly cloudy with scattered thunderstorms in the evening...then partly cloudy with slight chance of rain showers and isolated thunderstorms after midnight. Some thunderstorms may produce gusty winds...small hail and heavy rainfall...then some thunderstorms may produce gusty winds after midnight. Lows 38 to 44. Chance of precipitation 50 percent.
Sunday
Partly cloudy with slight chance of rain showers in the morning...then mostly cloudy with chance of thunderstorms in the afternoon. Some thunderstorms may produce gusty winds and small hail in the afternoon. Highs 65 to 73. Chance of precipitation 30 percent.
Mostly cloudy with chance of thunderstorms in the evening...then partly cloudy with slight chance of rain showers and isolated thunderstorms after midnight. Some thunderstorms may produce gusty winds and small hail in the evening. Lows 40 to 46. Chance of precipitation 30 percent.
Monday
Mostly sunny in the morning...then partly cloudy with a 30 percent chance of thunderstorms in the afternoon. Highs 70 to 78. Southwest winds around 15 mph in the afternoon.
Partly cloudy. Chance of thunderstorms in the evening...then slight chance of rain showers and isolated thunderstorms after midnight. Lows 40 to 46. Southwest winds around 15 mph in the evening. Chance of precipitation 30 percent.
Tuesday
Mostly sunny in the morning...then partly cloudy with a 20 percent chance of thunderstorms in the afternoon. Highs 67 to 75.
Tuesday Night
Breezy. Partly cloudy. Lows 39 to 45.
Wednesday
Partly cloudy. Highs 65 to 73.
Wednesday Night
Breezy. Partly cloudy. Lows 38 to 44.
Thursday
Partly cloudy. A 20 percent chance of thunderstorms in the afternoon. Highs 62 to 70.
Thursday Night
Partly cloudy. A 20 percent chance of thunderstorms in the evening. Lows 37 to 43.
Friday
Partly cloudy. Highs 66 to 74.
Friday Night
Partly cloudy in the evening then clearing. Lows 38 to 44.
Saturday
Partly cloudy. A 20 percent chance of thunderstorms in the afternoon. Highs 68 to 76.
... Significant weather advisory for Teton County until 445 PM MDT...
At 405 PM MDT... National Weather Service Doppler radar indicated a strong thunderstorm near U.S. Hwy 89/287 mile marker 210... or 19 miles northwest of Moran Junction... moving east at 15 mph.
Penny size hail... and winds around 40 mph are possible with this storm.
Residents in central Teton County... including the locations of U.S. Hwy 89/287 mile marker 210 and South Entrance to Yellowstone National Park... should monitor the weather situation closely. Listen for possible warnings and be prepared to take appropriate action should severe weather threaten.
Precautionary/preparedness actions...
Move indoors immediately as this storm approaches your location. This is a potentially dangerous storm. If you are in its path... you should be prepared for gusty winds... hail... and deadly cloud to ground lightning. If a sturdy structure is not available... seek shelter in a vehicle with the windows up.
Report hazardous weather to the National Weather Service office in Riverton at 1-800-211-1448.