Storm Events Database

Event Details

Event Hail
Magnitude 2.00 in.
State WYOMING
County/Area BIG HORN
WFO RIW
Begin Date 08/07/2009 16:10:00 MST-7
Begin Range 1
Begin Azimuth S
Begin Location GREYBULL
Begin Lat/Lon 44.49/-108.05
End Date 08/07/2009 16:15:00 MST-7
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 1/0
Property Damage 75.00K
Crop Damage 0.00K
Episode Narrative A large upper level low spinning slowly east from southern Idaho helped to trigger severe thunderstorms across the north half of Wyoming. Surface dew points in the 50s (degrees F), a favorable jet stream location, and a front sliding south from Montana all combined to set the stage for thunderstorms. The storms formed late in the afternoon and persisted through the evening and into the early morning hours.
Event Narrative Hailstones of golf ball size were numerous at a residence in Greybull. Some stones reached two inches in diameter.


All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 0 1 78.00K 25.00K
BURLINGTON BIG HORN CO. WY 08/07/2009 15:44 MST-7 Hail 1.25 in. 0 0 0.00K 25.00K
OTTO BIG HORN CO. WY 08/07/2009 15:51 MST-7 Hail 1.25 in. 0 0 0.00K 0.00K
GREYBULL BIG HORN CO. WY 08/07/2009 16:10 MST-7 Hail 2.00 in. 0 1 75.00K 0.00K
GREYBULL BIG HORN CO. WY 08/07/2009 16:15 MST-7 Hail 2.50 in. 0 0 0.00K 0.00K
GREYBULL BIG HORN CO. WY 08/07/2009 16:17 MST-7 Hail 2.00 in. 0 0 2.00K 0.00K
GREYBULL ARPT BIG HORN CO. WY 08/07/2009 16:24 MST-7 Thunderstorm Wind 51 kts. MG 0 0 0.00K 0.00K
KAYCEE GOSNEY ARPT JOHNSON CO. WY 08/07/2009 21:20 MST-7 Hail 2.00 in. 0 0 1.00K 0.00K
MAYOWORTH JOHNSON CO. WY 08/07/2009 21:25 MST-7 Hail 0.88 in. 0 0 0.00K 0.00K
BUFFALO JOHNSON CO. WY 08/07/2009 22:20 MST-7 Hail 1.75 in. 0 0 0.00K 0.00K
CASPER HARFORD ARPT NATRONA CO. WY 08/08/2009 01:10 MST-7 Hail 0.88 in. 0 0 0.00K 0.00K
Totals: 0 1 78.00K 25.00K