PUBLIC INFORMATION STATEMENT NATIONAL WEATHER SERVICE GLASGOW MT 849 PM MDT TUE JUL 9 2013 ...PUBLIC INFORMATION STATEMENT... ...DAMAGE SURVEY RESULTS FOR PRAIRIE AND DAWSON COUNTIES... THE FOLLOWING IS A FINAL ASSESSMENT FOR THE DAMAGE THAT OCCURRED OVER PRAIRIE AND DAWSON COUNTIES ON JULY 8 2013. * EVENT DATE: JULY 8 2013 * ESTIMATED START TIME: 5:35 PM * EVENT TYPE: STRAIGHT LINE WIND DAMAGE * EVENT LOCATION: TERRY...FALLON...AND NEAR GLENDIVE, MT * PEAK WIND: 95 MPH * DISCUSSION/DAMAGE: SEVERE THUNDERSTORMS DEVELOPED OVER NORTHEAST MONTANA AFTER 1PM ON MONDAY WITH THE INITIAL STORM IN WESTERN GARFIELD AND SOUTHWESTERN VALLEY COUNTIES. THIS SUPERCELL STORM TRACKED EAST-SOUTHEAST OVER THE NEXT 5 HOURS EVENTUALLY REACHING SOUTH DAKOTA. AFTER 4PM...OTHER SEVERE STORMS DEVELOPED OVER MCCONE...DAWSON...PRAIRIE...WIBAUX...AND RICHLAND COUNTIES. WIDESPREAD REPORTS WERE RECEIVED OF HAIL UP TO 3 INCHES IN DIAMETER ALONG WITH MEASURED WIND GUSTS UP TO 70 MPH. REPORTS WERE RECEIVED OF DAMAGE TO ROOFS AND WINDOWS OF BUILDINGS...DAMAGE TO CROPS...SOME KILLED LIVESTOCK...BROKEN CAR WINDOWS...AND DAMAGE TO TREES. THERE WAS ALSO HEAVY RAIN IN THE GLENDIVE AREA THAT CREATED FLASH FLOODING IN GLENDIVE. THE NWS OFFICE IN GLASGOW SURVEYED REPORTED STRUCTURAL DAMAGE IN THE TERRY...FALLON...AND GLENDIVE AREAS. IN TERRY...THE OLD DRIVE-IN MOVIE THEATER SCREEN WAS DESTROYED...ALONG WITH TREE LIMB DAMAGE. TREE LIMBS FALLING ON POWER LINES CREATED POWER OUTAGES IN THE AREA. IN FALLON...MANY BUILDINGS HAD ROOF DAMAGE AND WINDOW DAMAGE...AND THERE WAS WIDE SPREAD TREE DAMAGE WITH LARGE COTTONWOOD TREES UPROOTED. NUMEROUS SMALL OUTBUILDINGS WERE ALSO DAMAGED OR DESTROYED. DAMAGE OF THIS LEVEL IS CONSISTENT WITH AN ESTIMATED 95 MPH WIND SPEED. IN THE FALLON AREA...ALL DEBRIS MOVED IN A WEST-SOUTHWEST DIRECTION. EYEWITNESSES REPORTED THAT THE WIND DURING THE EVENT WAS STEADY AND OF A CONSTANT DIRECTION...EYEWITNESS REPORTED THAT THE WIND DAMAGE OCCURRED AT APPROXIMATELY 5:35 PM. EYEWITNESSES ALSO TOOK PHOTOGRAPHS OF THE APPROACHING STORM WHICH SHOWED A WELL-DEFINED SHELF CLOUD...INDICATIVE OF AN APPROACHING GUST FRONT. RADAR ALSO SHOWED A LARGE REFLECTIVITY CORE COLLAPSING SEVERAL MILES EAST OF THE FALLON AREA SHORTLY BEFORE THE TIME THAT EYEWITNESSES REPORTED THE WIND EVENT TOOK PLACE. DAMAGE IN THE FALLON AREA WAS CONCLUDED TO BE FROM STRAIGHT LINE WINDS FROM A MACROBURST THAT WAS GENERATED BY THE SEVERE STORMS IN THE AREA. 4 MILES SOUTHWEST OF GLENDIVE...A METAL OUTBUILDING HAD ITS WALLS BLOWN OUT WITH SHEET METAL DEBRIS CARRIED DOWN WIND A HALF MILE TO THE WEST SOUTHWEST. THIS DAMAGE IS CONSISTENT WITH AN ESTIMATED STRAIGHT LINE WIND SPEED OF 95MPH. $$