Two supercell thunderstorms and several multicell thunderstorms occurred along an eastward advance surface dryline during the evening hours. Damaging winds and large hail was reported in Deuel, Garden, Keith and Cherry counties.
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The episode as NWS LBF wrote it up.
Two supercell thunderstorms and several multicell thunderstorms occurred along an eastward advance surface dryline during the evening hours. Damaging winds and large hail was reported in Deuel, Garden, Keith and Cherry 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 North Platte, NE wrote its last area forecast discussion before the first event at Aug 11, 4:33 PM MST, 1 hour 11 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORTH PLATTE NE 633 PM CDT SAT AUG 11 2012 .AVIATION... VFR CONDITIONS ARE EXPECTED AT BOTH KLBF AND KVTN THROUGH THE CURRENT TAF PERIOD. HOWEVER MVFR WILL BE POSSIBLE UNDER THE MOST ROBUST OF STORM CELLS. STRONG STORMS WILL BE ISOLATED AT BEST...SO WILL LEAVE BOTH TERMINALS AT VFR WITH UPDATES POSSIBLE AS THE CONVECTIVE EVENT UNFOLDS. NEAR TERM SOLUTIONS/GUIDANCE HAS STRUGGLED WITH THE EARLY DEVELOPMENT OF THE TSTMS THIS AFTERNOON...THEREFORE CONFIDENCE IS LOWER THAN USUAL IN THE TAF FORECAST. THAT BEING SAID...EXPECT ADDITIONAL SHOWERS AND THUNDERSTORMS TO DEVELOP IN THE VICINITY OF A SOUTHEASTWARD ADVANCING COLD FRONT THIS EVENING. EXPECT THE STORMS TO BE HIGH BASED...WITH SMALL HAIL AND BRIEF GUSTY WINDS BEING THE MAIN THREAT. ALL TS ACTIVITY SHOULD MOVE EAST OF BOTH THE KVTN AND KLBF TERMINALS BY 07Z. SKIES WILL BEGIN TO CLEAR OUT AND WINDS WILL SWITCH TO OUT OF THE NORTHWEST BEHIND THE COLD FRONT. SKIES SHOULD BE PARTLY CLOUDY TOMORROW MORNING WITH WINDS INCREASING TO AROUND 15G21KT LATE MORNING. && .PREV DISCUSSION... /ISSUED 332 PM CDT SAT AUG 11 2012/ SHORT TERM... COLD FRONT WILL MOVE ACROSS THE FORECAST AREA THIS EVENING AND TONIGHT AND WILL BE THE MAIN FOCUS IN THE SHORT TERM. SOUNDINGS CONTINUE TO SHOW VERY DRY LOW LEVELS ACROSS THE HIGH PLAINS AND DEW POINTS ARE IN THE 50S. PRECIP WATER DESPITE LOW LEVEL DRYNESS ARE AROUND 1.25 INCHES. WATER VAPOR DOES SHOW GOOD MOISTURE COMING AROUND THE SWRN RIDGE AND WILL PROVIDE SOME MOISTURE TO WORK WITH FOR STORMS. MODEL MUCAPE IN THE 1K TO 2K J/KG RANGE ALONG THE FRONT. EXPECT SOME STORMS TO FIRE ALONG THE FRONT...WHICH HAS PUSHED INTO NW NEB ALREADY AND CONTINUE AS THE FRONT PUSHES EAST. WITH THE DRY LOW LEVELS...SOME CONCERN FOR STRONG WINDS TO DEVELOP FROM THE STORMS...COMMON WITH INVERTED V SOUNDINGS. LOCALLY HEAVY RAIN ALSO IS POSSIBLE WITH GOOD UPPER LEVEL MOISTURE...HOWEVER STORMS WILL HAVE TO BE FAIRLY STRONG FOR SIGNIFICANT RAINFALL. THE WEAKER STORMS WILL LIKELY PRODUCE LITTLE RAINFALL AND BE A FIRE WEATHER CONCERN DUE TO DRY FUELS AND DRY LIGHTNING. DUE TO DAYTIME CLOUDINESS FROM DEPARTING WEAK MID LEVEL WAVE...HIGHS HELD IN THE LOWER TO MID 80S. THIS MAY HAMPER DEVELOPMENT INITIALLY...HOWEVER STILL THINK WITH UPPER LEVEL SUPPORT ISOLATED TO SCATTERED STORMS ARE WARRANTED IN THE FORECAST. SYSTEM WILL EXIT TO THE EAST BY MORNING WITH COOLER AIR BEHIND THE FRONT AND HIGH PRESSURE. MIGHT SEE SOME WRAP AROUND MOISTURE FROM LOW IN NE NEB/NW IA THAT CLIPS PORTIONS OF N CENTRAL IN THE MORNING. HOWEVER THINK DRY LOW LEVELS AND WEAKNESS OF THE ACTIVITY TO RESULT IN VIRGA AT BEST. OTHERWISE DECREASING CLOUDS AND HIGHS IN THE UPPER 70S NE TO MID TO UPPER 80S IN SW NEB...WHERE MORE SUN WILL BE EXPERIENCED. MONDAY MORNING WILL START THE WORK WEEK OFF WITH COOL AND DRY CONDITIONS AS HIGH PRESSURE IN COMMAND...MAINLY CLEAR SKIES AND LOWS IN THE LOWER TO MID 50S. BY MONDAY AFTERNOON THE NEXT SYSTEM WILL BE PUSHING ACROSS THE ROCKIES. AHEAD OF THE SYSTEM WILL BE SEASONAL TEMPS WITH HIGHS IN THE 80S. BY MONDAY NIGHT THE MID LEVEL DISTURBANCE WILL MOVE ONTO THE PLAINS. DRY LOW LEVELS WILL CONTINUE TO BE A DETRIMENT TO GOOD RAINFALL AND HAVE SLIGHT CHANCE POPS IN THE FORECAST. LONG TERM... 12Z TUESDAY AND BEYOND. LITTLE CHANGE TO THE ONGOING FORECAST FOR THE EXTENDED PERIOD...WHICH WILL BE MARKED BY A COOL DOWN LATE IN THE WORK WEEK AND PRECIPITATION CHANCES WEDNESDAY NIGHT INTO THURSDAY. NORTHWESTERLY FLOW ALOFT WILL BE IN PLACE TO START THE EXTENDED AS A SERIES OF SHORTWAVE TROUGHS TRAVERSE SOUTHEAST FROM WESTERN CANADA INTO THE NORTHERN HIGH PLAINS. THE FIRST OF WHICH WILL BE SITUATED EAST OF THE CWA...OVER THE GREAT LAKES REGION...AND A SECOND WILL BEGIN TO EMERGE OFF THE COAST OF BRITISH COLUMBIA. BETWEEN THE INFLUENCE OF THESE WAVES...SENSIBLE CONDITIONS SHOULD REMAIN QUIET/DRY. TEMPERATURES ARE EXPECTED TO REMAIN SEASONAL TO SLIGHTLY ABOVE AVERAGE FOR TUESDAY AND WEDNESDAY WITH 80S AND LOW 90S BEING THE NORM. BEYOND MID WEEK HOWEVER...SYNOPTIC MODEL CONSENSUS INDICATES THE PASSAGE OF THE AFOREMENTIONED SECOND SHORTWAVE TROUGH/COLD FRONT COMBO WHICH WILL BRING AT LEAST CHANCE POPS FOR A LARGE PORTION OF THE FORECAST AREA BEGINNING AS EARLY AS WEDNESDAY NIGHT/THURSDAY MORNING. THE POSITIVELY TILTED TROUGH IS SHOWN BY THE GFS SOLUTION TO SWING THROUGH THE NORTHERN PLAINS LATE WEDNESDAY WITH THE FRONT ALONG OR JUST SOUTH OF THE SOUTH DAKOTA BORDER BY 16.00Z /THUR/. THE EUROPEAN IS RUNNING SOMEWHAT FASTER WITH THE FRONTAL PASSAGE...BEING MOSTLY THROUGH THE CWA SAVE OUR FAR SOUTHEASTERN/EASTERN ZONES BY 00Z THURSDAY. THE INCONSISTENCIES ARE MOST SEEN IN THE MODEL GENERATED QPF FIELDS WITH THE EURO PLAYING A MORE FAVORABLE DIURNAL TREND AND EARLIER STORM DEVELOPMENT WHEREAS THE GFS SEEMS TO BE TARGETING A GREATER NIGHTTIME SIGNAL. AT THIS POINT IN TIME SEE NO SOLUTION AS A CLEAR CUT FAVORITE...SO WILL MAINTAIN THE INHERITED SLIGHT CHANCE/CHANCE POPS WEDNESDAY NIGHT AND THURSDAY AND REFINE OR REMOVE WITH LATER FORECASTS. WILL SAY THAT THE BEST CHANCE FOR WIDESPREAD PRECIPITATION SHOULD OCCUR OVERNIGHT AS BOTH MODELS POINT TO POST FRONTAL PRECIPITATION WITHIN THE RIGHT REAR ENTRANCE OF A UPPER JET...SO WILL KEEP THE HIGHEST POPS GOING FOR THE OVERNIGHT PERIOD. REGARDLESS OF TIMING...MODEL SOUNDINGS DO SUGGEST A MODERATELY UNSTABLE ATMOSPHERE WITH MORE THAN SUFFICIENT BULK SHEAR FOR SOME HAILERS AND/OR WIND THREAT. THE GREATEST THREAT WOULD BE TIED DURING THE DIURNALLY FAVORABLE AFTERNOON/EVENING TIME PERIOD...BUT STRONG ACTIVITY COULD REMAIN WELL INTO THE OVERNIGHT AS WELL. THE MAIN BENEFIT OF THE FRONTAL BOUNDARY /BESIDES THE POTENTIAL FOR MUCH NEEDED PRECIPITATION/ WILL BE THE EXPECTED COOLDOWN FOR THURSDAY AND FRIDAY. LONGER RANGE SOLUTIONS ARE ADVERTISING 10-12C AT H85 BY 00Z FRIDAY ACROSS THE ENTIRE CWA. THIS WOULD ALLOW FOR SURFACE HIGH TEMPERATURES IN THE 70S OVER MOST IF NOT ALL LOCATIONS ACROSS WESTERN/NORTH CENTRAL NEBRASKA. SLIGHTLY WARMER...BUT STILL COOLER THAN AVERAGE FOR FRIDAY AS WAA ASSOCIATED WITH BUILDING HEIGHTS APPROACH FROM THE WEST. WARMER YET FOR SATURDAY AS AN UPPER RIDGE BUILDS ACROSS THE CENTRAL PLAINS. TEMPERATURES SHOULD BE A COUPLE DEGREES WARMER WITH A RETURN TO LOW 90S POSSIBLE /WESTERN AND SOUTHWESTERN PORTIONS OF THE CWA/ BY LATE AFTERNOON. WITH THE RIDGE AXIS ENTRENCHED OVER THE CWA...SEE NO REAL STRONG PRECIPITATION CHANCES FOR THE WEEKEND OR LATE WEEK FOR THAT MATTER. && .LBF WATCHES/WARNINGS/ADVISORIES...NONE. && SHORT TERM...MASEK AVIATION/LONG TERM...JACOBS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NORTH PLATTE NE 336 PM CDT SAT AUG 11 2012 NEZ004>010-022>029-035>038-056>059-069>071-094-122045- SHERIDAN-EASTERN CHERRY-KEYA PAHA-BOYD-BROWN-ROCK-HOLT-GARDEN- GRANT-HOOKER-THOMAS-BLAINE-LOUP-GARFIELD-WHEELER-ARTHUR-MCPHERSON- LOGAN-CUSTER-DEUEL-KEITH-PERKINS-LINCOLN-CHASE-HAYES-FRONTIER- WESTERN CHERRY- 336 PM CDT SAT AUG 11 2012 /236 PM MDT SAT AUG 11 2012/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WESTERN AND NORTH CENTRAL NEBRASKA. .DAY ONE...TONIGHT. A STRONG UPPER LEVEL DISTURBANCE WILL MOVE THROUGH THE NORTHERN PLAINS TONIGHT. ISOLATED STRONG OR SEVERE THUNDERSTORMS ARE POSSIBLE THIS EVENING ACROSS ALL OF WESTERN AND NORTH CENTRAL NEBRASKA. LARGE HAIL AND WIND DAMAGE ARE THE CONCERN WITH THE STRONG STORMS. WEAKER STORMS HAVE THE POTENTIAL FOR DRY LIGHTNING AND ISOLATED WILDFIRES. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED THROUGH TONIGHT. && THIS PRODUCT IS NOW AVAILABLE...ALONG WITH OTHER WEATHER... HYDROLOGICAL AND CLIMATOLOGICAL INFORMATION...AT HTTP://WWW.WEATHER.GOV/NORTHPLATTE MASEK
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORTH PLATTE NE 635 PM CDT SAT AUG 11 2012 NEZ004-094-120015- SHERIDAN NE-WESTERN CHERRY NE- 535 PM MDT SAT AUG 11 2012 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CHERRY AND NORTHEASTERN SHERIDAN COUNTIES UNTIL 615 PM MDT... AT 531 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 7 MILES WEST OF HOOVER LAKE...OR 10 MILES NORTH OF GORDON...MOVING SOUTHEAST AT 30 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... GORDON... SHELL LAKE STATE WILDLIFE MANAGEMENT AREA... INTERSECTION OF HIGHWAY 20 AND IRWIN ROAD... ROCK HILL... INTERSECTION OF HIGHWAY 61 AND SHADBOLT ROAD... HIGHWAY 20 MILE MARKER 110... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. JACOBS
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORTH PLATTE NE 549 PM MDT SAT AUG 11 2012 NEZ022-120030- GARDEN NE- 549 PM MDT SAT AUG 11 2012 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN GARDEN COUNTY UNTIL 630 PM MDT... AT 545 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 7 MILES NORTHWEST OF LISCO...OR 23 MILES NORTHWEST OF OSHKOSH...MOVING SOUTHEAST AT 30 MPH. HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... OSHKOSH... LISCO... INTERSECTION OF HIGHWAY 27 AND 9 MILE ROAD... BLUEWATER BATTLEFIELD STATE HISTORICAL PARK... LEWELLEN... HIGHWAY 26 MILE MARKER 100... 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. JACOBS
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORTH PLATTE NE 558 PM MDT SAT AUG 11 2012 NEZ022-023-120045- GARDEN NE-GRANT NE- 558 PM MDT SAT AUG 11 2012 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN GRANT AND CENTRAL GARDEN COUNTIES UNTIL 645 PM MDT... AT 554 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 5 MILES WEST OF RICHARDSON LAKE...OR 25 MILES NORTHWEST OF OSHKOSH...MOVING EAST AT 25 MPH. HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... RICHARDSON LAKE... CRESCENT LAKE NWR... DOGTOWN FLATS... DEER LAKE... BRITTON LAKE... BOURQUIM HILL... 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. JACOBS
The North Platte radar (KLNX), 161 km away, was scanning. The volume nearest the first event began at 00:45 UTC.
7 thunderstorm wind, 3 hail. Local standard time, as filed.
General public reported thunderstorm wind gusts of 70 mph with up to quarter size hail covering yard.
General public reported large trees blown down. Windows were broken out in quonset building and vehicle. A corral was also knocked down by thunderstorm wind gusts.
The hail was driven by winds estimated at 50 to 60 mph.
General public reported thunderstorm wind gusts estimated at 50 to 60 mph.
General public estimated thunderstorm wind gusts of 55 to 60 mph along with pea size hail.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2012Every state in 2012This day in weather historyWarnings in Nebraska, August 2012
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: 401690, 401692, 401688, 401701, 401685, 401693, 401694, 401696, 401697, 401700.