Thunderstorms produced damaging winds across portions of Converse and Niobrara counties.
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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.
Thunderstorms produced damaging winds across portions of Converse and Niobrara counties.
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 6, 11:44 AM MST, 3 hours 6 minutes earlier.
Area Forecast Discussion National Weather Service Cheyenne WY 1244 PM MDT WED JUL 6 2016 .UPDATE... Issued at 1243 PM MDT Wed Jul 6 2016 Sfc pressure falls continue to become more widespread across the forecast area, both in response to sfc heating under mostly sunny skies and to the upper level trough moving across the northern Rockies. Winds along and west of the Laramie Range have become quite breezy as a result, with gusts upwards of 40 mph observed across this area. Humidities across this area are on the downward trend as well, and think over the next few hours will see these conditions spread to the nearby eastern plains as the lee trough/dryline shifts east ahead of the progressive upper wave. So, will hold steady with the Red Flag Warning for now, although am monitoring for possible expansion into the southern Nebraska panhandle depending on the eventual eastward progression of the lee trough/dryline. Regarding storm potential, satellite imagery shows vigorous cu over the northern Laramie Range as well as across Laramie County, likely on the leading edge of the dryline. Should see initiation over the next couple of hours as this boundary pushes east, with best severe potential still looking to be across the far eastern panhandle counties where dew points are upper 50s/low 60s within southeastern flow. Certainly concerned for the possibility of large hail and damaging winds from any storms that feed off this environment, but enhanced 0-1km shear here could lend to a threat for a tornado as well, namely along the Pine Ridge and vicinity. Will monitor trends closely through the afternoon. .SHORT TERM...(Today through Friday) Issued at 345 AM MDT Wed Jul 6 2016 Lingering convection continues to dissipate as it shifts off to the east early this morning. Skies will continue to become mostly clear thru the rest of the morning hours. Two main forecast challenges today will be critical fire conditions across much of southeast Wyoming and the potential for severe thunderstorms across the northern Nebraska Panhandle. The culprit for both is a shortwave that will accelerate east thru Montana today. At the surface...upstream lee-side pressure falls are already occurring early this morning as the sfc reflection takes shape. The developing sfc low will slide east into the western Nebraska Panhandle by 00z. As this occurs, dryline will surge east across the SE Wyoming plains and into the western Nebraska Panhandle by afternoon. Behind the dryline, dew points will plummet into the upper 20s/low 30s which when combined with upper 80s/low 90s for highs will yield humidities in the 10-15 percent range. Additionally, deep-mixing up towards 20 kft MSL in the PBL will tap into winds that will gust to 25-35 mph. These conditions will be enough to warrant an upgrade to a Red Flag Warning for lower elevation zones where fuels are critical...FWZ301-310. Forecast challenge #2 - Severe Thunderstorm Potential in the northern Nebraska Panhandle. Dew point pooling ahead of the dryline and eventually a southward propagating front will yield progd sbcapes of 2500-3500 j/kg. These instabilities along with deep layer shear of 35-45 knots will be sufficient for severe thunderstorms. The key with today's severe thunderstorm potential will be the timing of the dryline surge. If it occurs earlier, convection doesn't get going until it moves east of our CWA. Later and we have more widespread severe convection in the panhandle. For now followed HRRR timing, keeping initiation northeast of the North Platte River Valley between 1-3 PM with best strengthening potential Chadron-Alliance thereafter. Added severe wording to the forecast in these areas to account for this scenario. These storms will likely be moving a pretty good clip...east at 30-35 mph or so. So although, weak convection will linger into the evening hours, the severe weather potential should diminish quickly by around 6 PM as best ingredients shift towards central Nebraska. Aforementioned shortwave will move into the Dakotas on Thursday expect a dry and breezy day with NW winds that will gust 20-35 mph. Return flow develops quickly for Friday and aside from a few showers/weak thunderstorms over far southeast WY, expect dry but warmer conditions to ensue. .LONG TERM...(Friday Night through Tuesday) Issued at 345 AM MDT Wed Jul 6 2016 Upper ridge axis will drift east of the CWA Friday night and Saturday as a potent upper low moves to just offshore of the Pacific nw. Weak impulses lifting northeast ahead of the upper low combined with some increased moisture moving northward should set off at least isolated convection mainly over the plains Saturday afternoon. Similar setup for Sunday as the upper low drifts east into the northern Rocky mtns with convection looking to focus on a surface trough that should be over the Nebraska Panhandle. Also fairly windy over western parts of the CWA Sunday as stronger mid level winds mix down in favorable southwesterly flow so could be some fire weather concerns then. The upper system becomes negatively tilted while lifting northeast over Montana Monday while a decent cold front for July sweeps east across the CWA Sunday night bringing breezy and cooler conditions Monday. Mainly dry Tuesday with temperatures close to seasonable averages. && .AVIATION...(For the 18Z TAFS through 18Z Thursday afternoon) Issued at 1243 PM MDT Wed Jul 6 2016 VFR conditions through the taf period. Isolated thunderstorms will be possible at CDR by late afternoon. Southwesterly winds will gust to 20-30 kts across southeast WY through the afternoon. A front will push across the region tonight with winds becoming northwesterly. && .FIRE WEATHER... Issued at 345 AM MDT Wed Jul 6 2016 A critical fire weather day ahead as a very dry, breezy and warm air mass surges east today. West winds gusting 25-35 mph will further dry out the air mass in downsloping conditions east of the Laramie Range. A Red Flag Warning has been issued for fire weather zones 301 and 310 (southeast WY plains east of the Laramie Range) where these critical weather conditions intersect with cured fuels. The worst of these conditions will be across the western side of these zones from Converse, Platte and Laramie Counties. Additionally, a few high-based showers/storms will be possible Rawlins-Douglas-Lusk later today. A cold front will slide south tonight, turning winds northwesterly for Thursday and bringing an end to fire weather concerns at least through the end of the week. Critical conditions may return again over the weekend (especially Sunday). && .CYS Watches/Warnings/Advisories... WY...Red Flag Warning until 8 PM MDT this evening for WYZ301-310. NE...None. && SHORT TERM...CAH LONG TERM...RE AVIATION...ZF FIRE WEATHER...CAH
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 242 PM MDT WED JUL 6 2016 WYZ101>119-072045- CONVERSE COUNTY LOWER ELEVATIONS-NIOBRARA COUNTY- NORTH LARAMIE RANGE-FERRIS/SEMINOE/SHIRLEY MOUNTAINS- SHIRLEY BASIN-CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY- EAST PLATTE COUNTY-GOSHEN COUNTY-CENTRAL CARBON COUNTY- NORTH SNOWY RANGE FOOTHILLS-SOUTHWEST CARBON COUNTY- SIERRA MADRE RANGE-UPPER NORTH PLATTE RIVER BASIN-SNOWY RANGE- LARAMIE VALLEY-SOUTH LARAMIE RANGE-SOUTH LARAMIE RANGE FOOTHILLS- CENTRAL LARAMIE COUNTY-EAST LARAMIE COUNTY- 242 PM MDT WED JUL 6 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL WYOMING...SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT ISOLATED TO WIDELY SCATTERED THUNDERSTORMS WILL BE POSSIBLE THROUGH THE EVENING. A FEW STORMS COULD BECOME STRONG WITH GUSTY WINDS AND SMALL HAIL POSSIBLE. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. NEZ002-003-072045- DAWES-BOX BUTTE- 242 PM MDT WED JUL 6 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF PANHANDLE NEBRASKA. .DAY ONE...THIS AFTERNOON AND TONIGHT A TORNADO WATCH IS IN EFFECT UNTIL 9 PM FOR DAWES AND BOX BUTTE COUNTIES. SCATTERED THUNDERSTORMS CAN BE EXPECTED THROUGH THE EVENING...WITH THE STORMS CAPABLE OF PRODUCING LARGE HAIL...DAMAGING WINDS...AND ISOLATED TORNADOES. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. NEZ019>021-054-055-095-096-072045- SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE-NORTH SIOUX- SOUTH SIOUX- 242 PM MDT WED JUL 6 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF PANHANDLE NEBRASKA. .DAY ONE...THIS AFTERNOON AND TONIGHT ISOLATED TO WIDELY SCATTERED THUNDERSTORMS WILL BE POSSIBLE THROUGH THE EVENING. A FEW STORMS COULD BECOME STRONG WITH GUSTY WINDS AND SMALL HAIL POSSIBLE. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 215 PM MDT WED JUL 6 2016 WYZ102-107-108-062100- NIOBRARA COUNTY WY-GOSHEN COUNTY WY-EAST PLATTE COUNTY WY- 215 PM MDT WED JUL 6 2016 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN GOSHEN...SOUTH CENTRAL NIOBRARA AND NORTHEASTERN PLATTE COUNTIES UNTIL 300 PM MDT... AT 214 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 9 MILES WEST OF RAWHIDE BUTTES...OR 18 MILES SOUTHWEST OF LUSK...MOVING EAST AT 35 MPH. DIME SIZE HAIL AND WIND GUSTS OF 50 TO 55 MPH WILL BE POSSIBLE WITH THIS STORM. THIS STRONG THUNDERSTORM WILL BE NEAR... RAWHIDE BUTTES AROUND 230 PM MDT. LAT...LON 4250 10476 4260 10479 4282 10427 4249 10411 TIME...MOT...LOC 2014Z 255DEG 32KT 4255 10469 RUBIN
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 255 PM MDT WED JUL 6 2016 WYZ101-102-062145- NIOBRARA COUNTY WY-CONVERSE COUNTY LOWER ELEVATIONS WY- 255 PM MDT WED JUL 6 2016 ...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL CONVERSE AND NORTHWESTERN NIOBRARA COUNTIES UNTIL 345 PM MDT... AT 255 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 9 MILES NORTHWEST OF MANNING RANCH...OR 31 MILES NORTHEAST OF DOUGLAS... MOVING EAST AT 45 MPH. DIME SIZE HAIL AND WIND GUSTS OF 50 TO 55 MPH WILL BE POSSIBLE WITH THIS STORM. THIS STRONG THUNDERSTORM WILL BE NEAR... LANCE CREEK AROUND 320 PM MDT. LAT...LON 4306 10506 4313 10509 4345 10450 4305 10427 TIME...MOT...LOC 2055Z 253DEG 38KT 4311 10500 RUBIN
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 307 PM MDT WED JUL 6 2016 NEZ095-WYZ102-108-062200- NORTH SIOUX NE-NIOBRARA COUNTY WY-GOSHEN COUNTY WY- 307 PM MDT WED JUL 6 2016 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN SIOUX...NORTHEASTERN GOSHEN AND SOUTHEASTERN NIOBRARA COUNTIES UNTIL 400 PM MDT... AT 307 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 11 MILES WEST OF HARRISON...OR 18 MILES EAST OF LUSK...MOVING EAST AT 35 MPH. DIME SIZE HAIL AND WIND GUSTS OF 50 TO 55 MPH WILL BE POSSIBLE WITH THIS STORM. THIS STRONG THUNDERSTORM WILL BE NEAR... HARRISON AROUND 330 PM MDT. OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE VAN TASSELL. LAT...LON 4259 10415 4274 10423 4300 10370 4261 10353 TIME...MOT...LOC 2107Z 249DEG 28KT 4268 10410 RUBIN
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 343 PM MDT WED JUL 6 2016 NEZ002-095-062230- NORTH SIOUX NE-DAWES NE- 343 PM MDT WED JUL 6 2016 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN SIOUX AND NORTHWESTERN DAWES COUNTIES UNTIL 430 PM MDT... AT 343 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR FORT ROBINSON CAMPGROUND...OR 30 MILES WEST OF CHADRON...MOVING EAST AT 40 MPH. DIME SIZE HAIL AND WIND GUSTS OF 50 TO 55 MPH WILL BE POSSIBLE WITH THIS STORM. THIS STRONG THUNDERSTORM WILL BE NEAR... CRAWFORD AROUND 355 PM MDT. WHITNEY LAKE AROUND 405 PM MDT. OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE FORT ROBINSON AND WHITNEY. A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM MDT FOR THE PANHANDLE OF NEBRASKA. LAT...LON 4266 10364 4276 10367 4299 10315 4262 10303 TIME...MOT...LOC 2143Z 259DEG 36KT 4273 10358 RUBIN
The Rapid City radar (KUDX), 156 km away, was scanning. The volume nearest the first event began at 21:47 UTC.
2 thunderstorm wind. Local standard time, as filed.
Estimated 60 mph wind gusts snapped large tree limbs.
Estimated 65 mph wind gusts were reported at Bill.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2016Every state in 2016This day in weather historyWarnings in Wyoming, July 2016
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: 652178, 652179.