Thunderstorms produced damaging winds in central Laramie County.
Every event with a place to put it. Tap one for its entry below.
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 in central Laramie County.
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 Aug 30, 4:01 PM MST, 11 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 501 PM MDT SAT AUG 30 2014 .SHORT TERM...(THIS EVENING THROUGH SUNDAY) ISSUED AT 418 PM MDT SAT AUG 30 2014 WATER VAPOR IMAGERY FROM THIS AFTERNOON SHOWS THE LEAD IMPULSE IN A QUASI-ZONAL FLOW PATTERN ENTERING SOUTHWEST WYOMING THIS AFTERNOON...WITH SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS DEVELOPING OVER THE CWA OUT AHEAD OF THIS WAVE. THE FOCUS FOR CONVECTIVE INITIATION WAS OVER THE MOUNTAINS EARLY THIS AFTERNOON...AND ALONG VARIOUS BOUNDARIES THAT SET UP ALONG LARAMIE AND CONVERSE COUNTIES THIS AFTERNOON. MLCAPES ARE UP TO 500 J/KG ACROSS THE PLAINS ACCORDING TO SPC MESOANALYSIS...WITH DEEP LAYER SHEAR 20 KTS OR LESS. THEREFORE...EXPECT CONVECTION TO CONTINUE THROUGH THIS EVENING INCLUDING LOCATIONS ACROSS THE NEB PANHANDLE AS THE UPPER WAVE APPROACHES. BUT WITH LACK OF SIGNIFICANT INSTABILITY AND SHEAR...STORMS SHOULD REMAIN RELATIVELY WEAK WITH GUSTY AND ERRATIC WINDS THE MAIN IMPACT. WITH MODERATE SOUTHWEST WINDS ALREADY IN PLACE OVER MUCH OF THE FORECAST AREA DUE TO 3MB/3HR PRESSURE FALLS OVER THE HIGH PLAINS...TSTORM DOWNDRAFTS COULD AUGMENT THE CURRENT WINDS SPEEDS...WITH GUSTS OF 50 TO 55 MPH GUSTS POSSIBLE FROM ANY STORMS. A COLD FRONT WILL TRY TO MOVE SOUTH ACROSS THE CWA THIS EVENING...BUT LOOKS TO STALL NW-SE ACROSS CONVERSE COUNTY INTO THE NORTHERN NEB PANHANDLE TONIGHT THRU EARLY SUNDAY. THIS SHOULD MAINTAIN SHOWER/TSTORM DEVELOPMENT OVER THIS AREA THIS EVENING AND AS THE UPPER WAVE MOVES ACROSS THE FORECAST AREA. A SECOND AND STRONGER PV ANOMALY WILL APPROACH FROM THE WEST EARLY SUNDAY MORNING...WITH A RE-INTENSIFICATION OF CONVECTION EXPECTED THROUGH THE MORNING IN RESPONSE TO THE INCREASED UPPER FORCING. THE LEFT EXIT REGION OF A 105 KT JET WILL MOVE OVERHEAD BY THE AFTERNOON AS WELL...WITH THE SFC FRONT MAKING A RUN SOUTH ACROSS THE PLAINS THROUGH THE LATE AFTERNOON. SO ANTICIPATE A GOOD COVERAGE OF SHOWERS AND STORMS THROUGH THE DAY WITH THE COMBINATION OF SFC AND UPPER FORCING...AND INCREASED POPS ANOTHER 5 TO 10 PERCENT FROM THE PREVIOUS FORECAST. LOOKING AT GUSTY WINDS...SMALL HAIL AND BRIEF MODERATE RAIN TO BE THE MAIN THREATS AS INSTABILITY VALUES ARE PROGGED TO BE BETWEEN 500 AND 1000 J/KG THRU THE AFTERNOON WITH ROUGHLY 30 KTS OF SHEAR OVERHEAD. MUCH DRIER AIR WILL MOVE IN SUNDAY EVENING WITH STORMS PUSHING TO THE EAST. ANOTHER COLD FRONT WILL APPROACH FROM THE NORTH MONDAY AFTERNOON AND SHOULD INITIATE A FEW SHOWERS AND T-STORMS ACROSS THE PLAINS IN THE AFTERNOON. OTHERWISE...SUNDAY AND MONDAY LOOK TO BE MUCH COOLER THAN TODAY WITH THE PASSAGE OF THESE COLD FRONTS. .LONG TERM...(SUNDAY NIGHT THROUGH SATURDAY) ISSUED AT 418 PM MDT SAT AUG 30 2014 THE LONGWAVE UPPER TROUGH SHOULD CONTINUE SHIFTING EAST OF OUR REGION TUESDAY WITH A DEEPLY DRY AIRMASS IN PLACE WITH MOST OF ANY STRONGER SHORTWAVE ENERGY COMING DOWN THE NORTHWESTERLY FLOW ALOFT REMAINING TO THE NORTH THROUGH AT LEAST WEDNESDAY. THIS PATTERN WILL KEEP OUR AREA DRY THROUGH WEDNESDAY...POSSIBLY SIGNIFICANTLY DRY WITH GFS SUGGESTING BOUNDARY LAYER DEWPOINTS GETTING INTO THE UPPER TEENS FOR SOME AREAS OUT IN THE HIGHER TERRAIN AND WESTERN ZONES TUESDAY INTO WEDNESDAY. SYNOPTIC SCALE PATTERN INDICATED IN THE GFS/ECMWF SUGGESTIVE THAT WESTERLY/SOUTHWESTERLY DOWNSLOPE WINDS WILL COME UP A BIT TUESDAY INTO WEDNESDAY AND WE ARE FORECASTING THEM A LITTLE HIGHER THAN WHAT THE RAW MODEL GUIDANCE SUGGESTS MIDWEEK WITH DEWPOINTS A FEW DEGREES DRIER AS WELL (PLEASE REFER TO FIRE WEATHER SECTION OF THE DISCUSSION FOR MORE INFORMATION ON POTENTIAL IMPACTS). OTHERWISE...GFS AND NOW THE ECMWF BOTH IN FAIR AGREEMENT DEEPENING AN UPPER TROUGH ALONG THE WEST COAST THURSDAY INTO FRIDAY...INDUCING A MORE SOUTHWESTERLY MID/UPPER FLOW ACROSS OUR AREA GOING INTO LATE WEEK. THIS PATTERN...IF IT DEVELOPS...SHOULD HELP US TAP INTO ANOTHER ROUND OF PACIFIC MOISTURE COMING UP THROUGH THE 4 CORNERS REGION INTO SOUTHERN WYOMING AND WESTERN NEBRASKA...SO WE CONTINUED PREVIOUS FORECAST TREND OF BRINGING SLIGHT CHANCE TO LOCALLY CHANCE POPS (HIGHER TERRAIN) FOR SHOWERS/THUNDERSTORMS BY LATE IN THE NEXT WEEK. && .AVIATION...(FOR THE 00Z TAFS THROUGH 00Z SUNDAY AFTERNOON) ISSUED AT 458 PM MDT SAT AUG 30 2014 COLD FRONT CONTINUES TO MOVE INTO THE AREA FROM THE WEST AND NORTHWEST. THIS FRONT SHOULD KEEP CONVECTION GOING THROUGH THE EVENING HOURS...AND POSSIBLY ALL NIGHT AS IT MOVES THROUGH. THINK WITH LOSS OF DAYTIME HEATING THOUGH...CONVECTION WILL LIKELY BE LIMITED. WILL KEEP VFR CONDITIONS FOR ALL AIRPORTS THROUGH THIS EVENING. && .FIRE WEATHER... ISSUED AT 418 PM MDT SAT AUG 30 2014 WIDELY SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE THIS AFTERNOON AND EVENING FOR MUCH OF THE DISTRICT AS A STRONG WEATHER DISTURBANCE MOVES THROUGH THE AREA. A WEAK COLD FRONT WILL MOVE SOUTH ACROSS ZONES 301 AND 311...AND WILL STALL ACROSS THIS AREA TONIGHT THROUGH EARLY SUNDAY. GUSTY WEST TO SOUTHWEST WINDS OCCURRING THIS AFTERNOON SOUTH OF THE FRONT WILL EASE TONIGHT...AND WILL INCREASE ONCE AGAIN THROUGH SUNDAY MORNING WITH GUSTS BETWEEN 30 AND 40 MPH EXPECTED ALONG AND WEST OF THE LARAMIE RANGE THROUGH THE AFTERNOON. WINDS ACROSS THE PLAINS WILL BE GUSTING 25 TO 30 MPH IN THE LATE MORNING UNTIL THE FRONT FINALLY PUSHES SOUTH ACROSS THIS AREA BETWEEN 1200 AND 1900. SHOWERS AND T-STORMS WILL OCCUR ALONG THE FRONT AND AS ANOTHER STRONG WEATHER DISTURBANCE MOVES OVER THE AREA THROUGH SUNDAY. DRIER CONDITIONS WILL DEVELOP BY MIDDLE OF NEXT WEEK WHILE GUSTY WEST WINDS CONTINUE IN AREAS ALONG AND WEST OF THE LARAMIE RANGE. LOOKING FOR FIRE WEATHER CONCERNS TO INCREASE ACROSS THIS AREA AS A RESULT. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && SHORT TERM...RJM LONG TERM...GARMON AVIATION...CLAYCOMB FIRE WEATHER...RJM
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 511 AM MDT SAT AUG 30 2014 WYZ101>119-311115- 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- 511 AM MDT SAT AUG 30 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST WYOMING. .DAY ONE...TODAY AND TONIGHT SHOWERS AND THUNDERSTORMS WILL DEVELOP OVER THE MOUNTAINS BY THE MIDDLE OF THIS AFTERNOON AND PUSH EAST OVER THE HIGH PLAINS BY THIS EVENING. A FEW OF THESE THUNDERSTORMS MAY BECOME STRONG...ESPECIALLY NORTH OF THE PLATTE RIVER VALLEY. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY SHOWERS AND THUNDERSTORMS WILL CONTINUE ON SUNDAY AS THE COLD FRONT MOVES EASTWARD INTO THE GREAT PLAINS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE NEZ002-003-019>021-054-055-095-096-311115- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX- 511 AM MDT SAT AUG 30 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE. .DAY ONE...TODAY AND TONIGHT SHOWERS AND THUNDERSTORMS WILL DEVELOP OVER THE MOUNTAINS OF EASTERN WYOMING BY THE MIDDLE OF THIS AFTERNOON AND MOVE EAST OVER THE HIGH PLAINS THIS EVENING. A FEW OF THESE THUNDERSTORMS MAY BECOME STRONG...ESPECIALLY ACROSS THE NORTHERN PANHANDLE. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY SHOWERS AND THUNDERSTORMS WILL CONTINUE ON SUNDAY AS A COLD FRONT ACCELERATES INTO THE GREAT PLAINS. A FEW THUNDERSTORMS MAY BECOME STRONG IN THE AFTERNOON. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && 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
213 PM MDT SAT AUG 30 2014
WYZ104-105-109-302100-
CENTRAL CARBON COUNTY WY-FERRIS/SEMINOE/SHIRLEY MOUNTAINS WY-SHIRLEY
BASIN WY-
213 PM MDT SAT AUG 30 2014
...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN CARBON COUNTY UNTIL 300
PM MDT...
AT 208 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 12 MILES NORTH OF SEPARATION LAKE...OR 25 MILES
NORTH OF RAWLINS...MOVING NORTHEAST AT 25 MPH.
WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM.
LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
SEMINOE DAM...
SEMINOE CAMPGROUND...
IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.
&&
LAT...LON 4243 10700 4243 10645 4217 10647 4204 10724
4221 10729
TIME...MOT...LOC 2013Z 246DEG 22KT 4217 10716
HAMMERSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
331 PM MDT SAT AUG 30 2014
WYZ108-119-302200-
EAST LARAMIE COUNTY WY-GOSHEN COUNTY WY-
331 PM MDT SAT AUG 30 2014
...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN LARAMIE AND
SOUTHEASTERN GOSHEN COUNTIES UNTIL 400 PM MDT...
AT 329 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR MERIDEN REST AREA...OR 37 MILES NORTHEAST OF
CHEYENNE...MOVING EAST AT 15 MPH.
HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN.
LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
LA GRANGE...
IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.
TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.
&&
LAT...LON 4148 10435 4157 10439 4172 10406 4171 10405
4150 10405
TIME...MOT...LOC 2131Z 253DEG 12KT 4154 10431
HAMMERSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 454 PM MDT SAT AUG 30 2014 WYZ117>119-302345- CENTRAL LARAMIE COUNTY WY-EAST LARAMIE COUNTY WY-SOUTH LARAMIE RANGE FOOTHILLS WY- 454 PM MDT SAT AUG 30 2014 ...SIGNIFICANT WEATHER ADVISORY FOR EASTERN LARAMIE COUNTY UNTIL 545 PM MDT... AT 449 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 6 MILES NORTH OF WARREN AF BASE TO 5 MILES NORTH OF NATURAL FORT REST AREA...AND MOVING NORTHEAST AT 30 MPH. WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THESE STORMS. LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE... CHEYENNE... FRONTIER PARK... NORTH CHEYENNE... ARCHER EXIT... CARPENTER... HILLSDALE... BURNS... GUN BARREL... SOUTH GREELEY HIGHWAY... THIS INCLUDES INTERSTATE 80 IN WYOMING BETWEEN MILE MARKERS 355 AND 390. THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 0 AND 9. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. && LAT...LON 4129 10496 4154 10430 4099 10426 4099 10494 TIME...MOT...LOC 2255Z 235DEG 28KT 4126 10485 4106 10483 HAMMER
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
511 PM MDT SAT AUG 30 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0510 PM TSTM WND GST 7 E CHEYENNE 41.15N 104.66W
08/30/2014 E40 MPH LARAMIE WY PUBLIC
ARCHER EXIT ON I-80.
&&
GCLAYCOMThe Cheyenne radar (KCYS), 15 km away, was scanning. The volume nearest the first event began at 23:12 UTC.
1 thunderstorm wind. Local standard time, as filed.
Estimated wind gusts of 60 mph were reported at the Interstate 80 Port of Entry east of Cheyenne.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2014Every state in 2014This day in weather historyWarnings in Wyoming, August 2014
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: 532527.