8/30/13, 12:00pm: A thunderstorm is crossing the southeast side of Yellowstone National Park

YELLOWSTONE NATIONAL PARK WY-
1244 PM MDT FRI AUG 30 2013

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL PARK AND NORTHEASTERN
TETON COUNTIES IN NORTHWEST WYOMING UNTIL 130 PM MDT...

AT 1242 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM NEAR SOUTH ENTRANCE...MOVING NORTHEAST AT 30
MPH.

HAIL FROM ONE QUARTER TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP
TO 45 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH BRIEF HEAVY RAIN
AND FREQUENT DANGEROUS LIGHTNING.

THIS STORM WILL BE NEAR...
LEWIS LAKE AROUND 1250 PM MDT.
HEART LAKE AROUND 100 PM MDT.
SOUTH ARM OF LAKE YELLOWSTONE AROUND 120 PM MDT.
SOUTHEAST ARM OF LAKE YELLOWSTONE AROUND 130 PM MDT.