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High Country Observer
Weather Service Riverton, WY
Volume 7 Issue
2, December 2003
Severe Weather, A Year in
By Mark Cunningham
The first active day of the 2003 season was on June 16th.
A very moist and unstable airmass resulted in severe thunderstorms firing
rapidly across Fremont and Natrona counties during
the late afternoon and evening of the 16th. Golfball
size hail was reported in Casper and Lysite. Also,
there were five reports of quarter size hail. Along with the severe weather,
the thunderstorms produced very heavy rain. Flash flooding
occurred ten miles north
of Lysite with creeks and streams reported out of their banks. In addition,
nine miles southwest of Casper rocks, boulders,
mud and water covered Highway 220.
Two funnel clouds were
also sighted this day, one
was seen in Fremont County and another in Washakie County. On the 19th,
stationary thunderstorms over northern Johnson
county resulted in flash flooding near Buffalo.
Flood waters washed out a portion of Trabing Road, 6 miles south of Buffalo.
Two motorcyclists clung to a fence six miles east
of Buffalo on I-90, as their motorcycles were
washed away. June 28th turned out to be another busy day as
severe thunderstorms erupted over Fremont county
during the late afternoon and early evening. Golfball
size hail was reported in Fort Washakie and seven
miles north of Fort Washakie. Elsewhere,
quarter size hail was reported in Lander and Hiland.
Funnel clouds and mesocyclones were sighted
in Fremont and Natrona counties.
On July 7th, afternoon and
evening thunderstorms produced golfball and penny size hail
about 30 miles east of Buffalo, in Johnson county.
On August 17th, afternoon severe thunderstorms produced a hail
storm in Riverton. There were numerous reports of large hail ranging from
the size of nickels to golfballs for 10 to 15 minutes. The rest of August
and September yielded little severe weather.
Questions or Comments?
Forward questions or comments to:
857-3898 ext. 677, leave message for Mark Cunningham
857-3861, attention Mark Cunningham
12744 W. Hwy 26