July 19 - Severe Weather Across Eastern Wyoming

A series of strong to severe thunderstorms developed across Johnson and Natrona counties Thursday afternoon around 2 pm MDT and lasted until around 9 pm. These storms produced hail as large as golf balls and caused flash flooding in some areas into Friday morning.  The hardest hit areas were areas just northwest of Kaycee and just southwest of Casper.  Although large hail and some high winds were observed, the big story was the flash flooding that occurred.  A very moist environment and the slow movement of storms allowed for copious amounts of rain in a short amount of time.   Just west and southwest of  Casper...1 foot of water was reported in several locations on Poison Spider Road with additional flooding in the Goose Egg and Jackson Canyon area.  Farther north into Johnson County, 5 inches of rain fell in an hour and half...8 miles northwest of Kaycee in the  North Fork Powder River drainage.  This caused major flooding along portions of highway 191 between Kaycee and Mayoworth with some of the road being damaged.  Some damage was also observed several hours later east of Kaycee where the North Fork Powder River crosses Highway 192.   However, no damage was reported in the city of Kaycee.

 Storm Reports Received at WFO RIW:

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0202 PM     HAIL             16 W BUFFALO            44.34N 107.04W
07/19/2007  E0.88 INCH       JOHNSON            WY   PUBLIC

            HAIL WAS ACCOMPANIED BY VERY HEAVY RAIN.

0313 PM     HAIL             22 W BUFFALO            44.34N 107.16W
07/19/2007  E0.88 INCH       JOHNSON            WY   PUBLIC

0349 PM     HAIL             22 W BUFFALO            44.34N 107.16W
07/19/2007  E1.00 INCH       JOHNSON            WY   PUBLIC

0529 PM     HAIL             POWDER RIVER            43.03N 106.98W
07/19/2007  E1.75 INCH       NATRONA            WY   TRAINED SPOTTER

0530 PM     HAIL             26 SSW BUFFALO          43.99N 106.92W
07/19/2007  E0.75 INCH       JOHNSON            WY   TRAINED SPOTTER

0535 PM     FLASH FLOOD      5 W CASPER              42.83N 106.43W
07/19/2007                   NATRONA            WY   EMERGENCY MNGR

            4 TO 5 AREAS ALONG POISON SPIDER ROAD EXPERIENCED
            FLOODING.

0535 PM     FLASH FLOOD      4 W MILLS               42.85N 106.46W
07/19/2007                   NATRONA            WY   TRAINED SPOTTER

            SEVERAL AREAS ALONG POISON SPIDER ROAD EXPERIENCED
            FLOODING. THE WATER ON THE ROAD WAS ONE FOOT DEEP.

0547 PM     HAIL             10 N KAYCEE             43.85N 106.64W
07/19/2007  E0.88 INCH       JOHNSON            WY   TRAINED SPOTTER

0621 PM     HAIL             8 NW KAYCEE             43.79N 106.75W
07/19/2007  E1.75 INCH       JOHNSON            WY   TRAINED SPOTTER

0700 PM     FLASH FLOOD      8 NW KAYCEE             43.79N 106.75W
07/19/2007                   JOHNSON            WY   TRAINED SPOTTER

            NORTH FORK POWDER RIVER IS OUT OF ITS BANKS ALONG STATE
            HWY 191 ABOUT 8 MILES NORTHWEST OF KAYCEE.

0629 PM     HAIL             POWDER RIVER            43.03N 106.98W
07/19/2007  M1.75 INCH       NATRONA            WY   PUBLIC

            GOLF BALL SIZE HAIL FELL FOR 10 TO 15 MINUTES.

0730 PM     FLASH FLOOD      8 NW KAYCEE             43.79N 106.75W
07/19/2007                   JOHNSON            WY   TRAINED SPOTTER

            5 INCHES OF RAIN FELL IN ABOUT AN HOUR AND A HALF.

0840 PM FLASH FLOOD 5 SW CASPER 42.78N 106.40W
07/19/2007 NATRONA WY EMERGENCY MANAGER

SEVERAL ROADS WITH WATER OVER THEM IN THE GOOSE EGG AREA.

0900 PM FLASH FLOOD 8 NW KAYCEE 43.79N 106.75W
07/19/2007 JOHNSON WY LAW ENFORCEMENT

PORTIONS OF HIGHWAY 191 HAD WATER FLOWING ACROSS IT. HIGHWAY 191
IS DOWN TO ONE LANE DUE TO DAMAGE FROM THE FLOODING WATERS FROM THE
NORTH FORK POWDER RIVER.

0200 AM FLASH FLOOD 5 E KAYCEE 43.71N 106.54W
07/20/2007 JOHNSON WY LAW ENFORCEMENT

A GARAGE IN A LOW LYING AREA HAD 4 FEET OF WATER IN IT. ONE INCH OF
WATER OVER HIGHWAY 192 AT THE INTERSECTION OF THE NORTH FORK POWDER
RIVER.


 



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