An area of thunderstorms produced strong outflow winds which damaged or uprooted some trees.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS CYS wrote it up.
An area of thunderstorms produced strong outflow winds which damaged or uprooted some trees.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Cheyenne, WY wrote its last area forecast discussion before the first event at Jul 24, 2:48 PM MST, 2 hours 17 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 348 PM MDT FRI JUL 24 2009 .SHORT TERM...TONIGHT THRU SUNDAY...COLD FRONT SLOWLY BEGAN TO MAKE ITS WAY ACROSS THE AREA EARLY TODAY. MSAS SURFACE PRESSURE CHANGE ANALYSIS AT 20Z SHOWS THE FRONT THROUGH SOUTHERN BOX BUTTE AND SIOUX COUNTIES IN NEBRASKA...AND UP NW THROUGH NORTHERN GOSHEN AND CENTRAL CONVERSE. PRESSURE RISES BEHIND THE FRONT ARE RATHER WEAK WHICH MEANS THE SOUTHWARD PROGRESSION OF THE FRONT WILL BE SLOW THROUGH THE AFTERNOON AND EVENING. TEMPERATURES AHEAD OF THE FRONT WERE QUITE HOT...WITH MOST AREAS REACHING THE 90S. KSNY WAS THE HOT SPOT AS ASOS RECORDED 100 DEGREES THIS AFTERNOON. WITH THE HOT TEMPERATURES...MUCH OF THE LOW LEVEL MOISTURE MIXED OUT. ONLY THE NORTHERN HALF OF THE PANHANDLE HAS MAINTAINED LOW LEVEL MOISTURE...MOST OF WHICH IS POOLED BEHIND THE FRONT. SOME VERY HIGH BASED CONVECTION HAS FIRED OVER THE MOUNTAINS AND IS SLOWLY SPREADING TO THE EAST...PRODUCING LIGHT RAIN AND GUSTY WINDS. COULD STILL SEE SOME THUNDERSTORMS INTENSIFY OVER EXTREME SE WY AND THE WESTERN NEBRASKA PANHANDLE AS THEY COLLIDE WITH THE FRONT AND FEED OFF THE SURFACE BASED MOISTURE. THESE STORMS WILL LINGER THROUGH THE EVENING AND DISSIPATE IN THE OVERNIGHT HOURS. THE FRONT WILL MAKE ITS WAY THROUGH THE CWA OVERNIGHT AND TOMORROW WILL BE NEARLY 5 TO 15 DEGREES COOLER ACROSS MUCH OF THE REGION. A WEAK UPPER FEATURE WILL MOVE ACROSS SOUTHERN WYOMING AND NORTHERN COLORADO IN WESTERLY FLOW ALOFT TOMORROW AFTERNOON. SOME REMNANT MOISTURE AND SE UPSLOPE FLOW AT THE SURFACE WILL SET THE STAGE FOR MORE AFTERNOON THUNDERSTORMS...PARTICULARLY OVER THE MOUNTAINS WHERE INSTABILITY IS GREATEST. SUNDAY LOOKS TO BE SIMILAR STORY EXCEPT FOR MORE WIDESPREAD COVERAGE FOR STORMS WITH A STRONGER WAVE MOVING OVERHEAD IN NW FLOW AND A MORE UNSTABLE ENVIRONMENT. .LONG TERM...MONDAY THROUGH FRIDAY...THE UPPER LEVEL LOW CURRENTLY OVER NORTHEAST WASHINGTON AND NORTHERN IDAHO WILL MOVE SOUTHEAST TOWARD THE FORECAST AREA SUNDAY NIGHT AND MONDAY. THIS WILL ALLOW THE BROAD UPPER TROUGH ACROSS THE UNITED STATES TO SPREAD WESTWARD AND OPEN UP A MOIST NORTHERLY FLOW FOR NEXT WEEK. HAVE INCREASED PRECIPITATION CHANCES THROUGH MOST OF THE PERIOD AND COOLED TEMPERATURES IN THE FORECAST AGAIN BASED ON THE CONSENSUS MODEL GUIDANCE. GFS ENSEMBLES CONTINUE TO INDICATE ANOMALOUSLY LOW 500 MB HEIGHTS...AND THE GENERAL CYCLONIC FLOW ALOFT WILL ALSO SUPPORT INCREASED PRECIPITATION ACROSS THE AREA. && .AVIATION...MOSTLY VFR CONDITIONS WILL CONTINUE THROUGH SATURDAY NIGHT. A FEW THUNDERSTORMS WILL CONTINUE THROUGH THIS EVENING WHICH COULD PRODUCE BRIEF MVFR VSBYS AND CIGS IN ADDITION TO GUSTY WINDS. CLOUD BASES WILL LOWER SAT WITH A LITTLE BETTER COVERAGE OF SHOWERS AND LATE DAY THUNDERSTORMS MAINLY AT THE WYOMING TERMINALS. && .FIRE WEATHER...HOT AND DRY CONDITIONS WILL CONTINUE THROUGH THIS EVENING ACROSS MUCH OF THE AREA. A COLD FRONT WILL MOVE ACROSS THE AREA THIS EVENING...SHIFTING WINDS TO THE EAST TO NORTHEAST AND BRINING COOLER TEMPS AND HIGHER RHS BY SAT. THUNDERSTORMS ARE ALSO POSSIBLE ALONG AND AHEAD OF THE FRONT. TEMPS WILL BE BELOW NORMAL FOR MUCH OF NEXT WEEK WITH DECENT CHANCES OF RAIN...EASING FIRE WEATHER CONCERN AS FUELS CONTINUE TO SLOWLY CURE. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && SHORT TERM/AVIATION...RJM LONG TERM...CARPENTER
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1203 PM MDT FRI JUL 24 2009 NEZ001>003-019>021-054-055-WYZ059>070-251815- SIOUX-DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL- CHEYENNE-CONVERSE-NIOBRARA-SOUTHWEST CARBON-NORTH CARBON- SNOWY RANGE-NORTH LARAMIE RANGE-LARAMIE VALLEY-LARAMIE RANGE- PLATTE-GOSHEN-CHEYENNE FOOTHILLS-PINE BLUFFS- 1203 PM MDT FRI JUL 24 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE AND SOUTHEAST WYOMING. .DAY ONE...TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE IS A CHANCE OF AFTERNOON THUNDERSTORMS THROUGH THE PERIOD. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 327 PM MDT FRI JUL 24 2009 WYZ060-067-068-242230- GOSHEN-NIOBRARA-PLATTE- 327 PM MDT FRI JUL 24 2009 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN PLATTE...NORTHERN GOSHEN AND SOUTHEASTERN NIOBRARA COUNTIES UNTIL 430 PM MDT... AT 326 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 8 MILES SOUTHWEST OF RAWHIDE BUTTES...OR 21 MILES SOUTH OF LUSK...MOVING EAST AT 14 MPH. SMALL HAIL...AND WINDS AROUND 50 MPH ARE EXPECTED WITH THIS STORM.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 427 PM MDT FRI JUL 24 2009 NEZ001-019-WYZ068-242315- GOSHEN-SCOTTS BLUFF-SIOUX- 427 PM MDT FRI JUL 24 2009 ...SIGNIFICANT WEATHER ADVISORY FOR EASTERN GOSHEN...NORTHWESTERN SCOTTS BLUFF AND SOUTHWESTERN SIOUX COUNTIES UNTIL 515 PM MDT... AT 425 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR TORRINGTON...MOVING EAST AT 20 MPH. NICKEL SIZE HAIL IS EXPECTED WITH THIS STORM.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
428 PM MDT FRI JUL 24 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0422 PM HAIL 3 W TORRINGTON 42.07N 104.24W
07/24/2009 E0.50 INCH GOSHEN WY TRAINED SPOTTER
&&
LUNDQUISTPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
435 PM MDT FRI JUL 24 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0430 PM HAIL TORRINGTON 42.07N 104.18W
07/24/2009 E0.25 INCH GOSHEN WY TRAINED SPOTTER
&&
LUNDQUISTSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 514 PM MDT FRI JUL 24 2009 NEZ001-019-WYZ068-250000- GOSHEN-SCOTTS BLUFF-SIOUX- 514 PM MDT FRI JUL 24 2009 ...SIGNIFICANT WEATHER ADVISORY FOR EASTERN GOSHEN...SOUTHWESTERN SIOUX AND WESTERN SCOTTS BLUFF COUNTIES UNTIL 600 PM MDT... AT 513 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR MORRILL...OR 13 MILES SOUTHEAST OF TORRINGTON...MOVING EAST AT 13 MPH. PENNY SIZE HAIL...AND WINDS AROUND 50 MPH ARE EXPECTED WITH THIS STORM.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 526 PM MDT FRI JUL 24 2009 NEZ020-021-054-055-250015- BANNER-CHEYENNE-KIMBALL-MORRILL- 526 PM MDT FRI JUL 24 2009 ...SIGNIFICANT WEATHER ADVISORY FOR EASTERN BANNER...NORTHEASTERN KIMBALL...NORTHWESTERN CHEYENNE AND SOUTHWESTERN MORRILL COUNTIES UNTIL 615 PM MDT... AT 525 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR BIGHORN MOUNTAIN...OR 20 MILES SOUTH OF SCOTTSBLUFF...MOVING EAST AT 20 MPH. PENNY SIZE HAIL...AND WINDS AROUND 50 MPH ARE EXPECTED WITH THIS STORM.
The Cheyenne radar (KCYS), 138 km away, was scanning. The volume nearest the first event began at 00:07 UTC.
2 thunderstorm wind. Local standard time, as filed.
Numerous trees were damaged or uprooted with two trees falling onto a house and damaging the roof. An outbuilding was destroyed along with some power outages.
Brief storm outflow wind gusts were estimated up to 60 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2009Every state in 2009This day in weather historyWarnings in Nebraska, July 2009
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 178230, 178232.