Severe Thunderstorm Warning 130, NWS Denver/Boulder, CO

388 
WWUS55 KBOU 290033
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
633 PM MDT SUN JUN 28 2015

COC001-123-290100-
/O.CON.KBOU.SV.W.0130.000000T0000Z-150629T0100Z/
ADAMS CO-WELD CO-
633 PM MDT SUN JUN 28 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM MDT
FOR NORTHWESTERN ADAMS AND SOUTHWESTERN WELD COUNTIES...

AT 630 PM MDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR HUDSON...OR 
26 MILES SOUTH OF GREELEY...MOVING SOUTHEAST AT 10 MPH. ADDITIONAL 
THUNDERSTORMS WERE LOCATED ALONG EXTENDING NORTH TO NEAR LASALLE. 
SPOTTERS IN THE FORT LUPTON AND HUDSON AREAS HAVE BEEN REPORTING PEA 
SIZED HAIL FROM THESE THUNDERSTORMS. ADDITIONAL STRENGTHENING OF THE 
STORMS IS STILL POSSIBLE. 

HAZARD...QUARTER SIZE HAIL. 

SOURCE...RADAR INDICATED. 

IMPACT...DAMAGE TO VEHICLES IS EXPECTED. 

LOCATIONS IMPACTED INCLUDE...
NORTHEASTERN COMMERCE CITY...BRIGHTON...FORT LUPTON...LOCHBUIE...
PLATTEVILLE...HUDSON...LA SALLE...GILCREST...BARR LAKE AND MILTON
RESERVOIR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

PREPARE IMMEDIATELY FOR LARGE HAIL AND DEADLY CLOUD TO GROUND
LIGHTNING. SEEK SHELTER INSIDE A WELL-BUILT STRUCTURE. STAY AWAY FROM
WINDOWS.

&&

LAT...LON 4037 10483 4036 10461 3993 10456 3990 10482
TIME...MOT...LOC 0030Z 315DEG 10KT 4004 10468 

HAIL...1.00IN
WIND...<50MPH

$$

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465 
WWUS55 KBOU 290039
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
639 PM MDT SUN JUN 28 2015

COC001-123-290100-
/O.CON.KBOU.SV.W.0130.000000T0000Z-150629T0100Z/
ADAMS CO-WELD CO-
639 PM MDT SUN JUN 28 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM MDT
FOR NORTHWESTERN ADAMS AND SOUTHWESTERN WELD COUNTIES...

AT 636 PM MDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR HUDSON...OR 
26 MILES NORTHEAST OF DENVER...MOVING SOUTHEAST AT 10 MPH. 
ADDITIONAL THUNDERSTORMS STRETCHED NORTHWARD TO MILTON RESERVOIR. AT 
635 PM MDT...A SPOTTER IN BRIGHTON ESTIMATED WINDS TO BE 50 TO 60 
MPH ALONG WITH PEA SIZED HAIL AND VERY HEAVY RAINFALL. 

HAZARD...QUARTER SIZE HAIL AND 60 MPH WIND GUSTS. 

SOURCE...RADAR INDICATED. 

IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE TO 
         ROOFS...SIDING AND TREES. 

LOCATIONS IMPACTED INCLUDE...
NORTHEASTERN COMMERCE CITY...BRIGHTON...FORT LUPTON...LOCHBUIE...
HUDSON...BARR LAKE AND MILTON RESERVOIR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

VERY HEAVY RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO 
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 4025 10480 4025 10460 3993 10456 3990 10482
TIME...MOT...LOC 0036Z 315DEG 10KT 4003 10466 

HAIL...1.00IN
WIND...60MPH

$$

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019 
WWUS55 KBOU 290056
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
656 PM MDT SUN JUN 28 2015

COC001-123-290104-
/O.EXP.KBOU.SV.W.0130.000000T0000Z-150629T0100Z/
ADAMS CO-WELD CO-
656 PM MDT SUN JUN 28 2015

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN ADAMS AND
SOUTHWESTERN WELD COUNTIES WILL EXPIRE AT 700 PM MDT...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR 
PROPERTY. THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.  
HOWEVER...HEAVY RAIN IS STILL FALLING OVER SOUTHWESTERN WELD COUNTY 
WITH THIS THUNDERSTORM. THE HEAVIEST RAINFALL HAS FALLEN BETWEEN 
FORT LUPTON AND HUDSON.  UP TO TWO AND A HALF INCHES OF RAIN HAS 
FALLEN NEAR HUDSON IN THE PAST 30 MINUTES.  MOTORISTS SHOULD USE 
CAUTION IF THEY ENCOUNTER FLOODED ROADWAYS.  TURN AROUND...DON'T 
DROWN. 

LAT...LON 4025 10480 4025 10460 3993 10456 3990 10482
TIME...MOT...LOC 0053Z 344DEG 13KT 4003 10466 

$$

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AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
208 PM MDT SUN JUN 28 2015

.SHORT TERM...(THIS EVENING THROUGH MONDAY)
ISSUED AT 205 PM MDT SUN JUN 28 2015

SCATTERED THUNDERSTORMS FORMED OVER THE FOOTHILLS AND MOUNTAINS
SHORTLY AFTER NOON. EXPECT STORMS TO CONTINUE INTO THE EVENING
HOURS AS THEY SPREAD EASTWARD ACROSS THE AREA. SURFACE BASED CAPES
WILL BE AROUND 1000 J/KG WITH SURFACE TEMPERATURES NEAR 90 DEGREES
AND DEW POINTS AROUND 50. PRECIPITABLE WATER VALUES WILL CONTINUE
TO INCREASE AND APPROACH AN INCH BY EARLY EVENING. EXPECT THE
THUNDERSTORMS TO PRODUCE HEAVY RAIN...SMALL HAIL AND GUSTY OUTFLOW
WINDS. CAN'T RULE OUT A FEW BRIEF SEVERE STORMS WITH HAIL ONE INCH
IN DIAMETER AND 60 MPH WIND GUSTS. STORMS WILL COME TO AN END
AROUND MIDNIGHT.

ON MONDAY...THE STRONG UPPER LEVEL HIGH WILL REMAIN WEST OF
COLORADO AND CONTINUE TO BRING A NORTH-NORTHWEST FLOW ALOFT TO THE
STATE. HIGH TEMPERATURES WILL STAY ABOUT THE SAME AS TODAY...SO
EXPECT HIGHS IN THE UPPER 80S TO LOWER 90S AGAIN MONDAY. MOISTURE
AND INSTABILITY DECREASE MONDAY WITH CAPES LESS THAN 1000 J/KG.
MID LEVEL TEMPERATURES WILL WARM A FEW DEGREES AND LIKELY CAP
CONVECTION ACROSS THE FRONT RANGE AND EASTERN PLAINS. STILL
EXPECT TO SEE ISOLATED SHOWERS AND STORMS OVER THE MOUNTAINS AND
PARK COUNTY.

.LONG TERM...(MONDAY NIGHT THROUGH SUNDAY)
ISSUED AT 205 PM MDT SUN JUN 28 2015

MEGA BLOCKING UPPER RIDGE OVER THE WESTERN QUARTER OF THE U.S.
NEXT COUPLE OF DAYS IS PROGGED TO DEAMPLIFY/WEAKEN AS A SERIES OF
SHORTWAVES RACE EAST OVER THE PACIFIC NORTHWEST. SOME OF THIS
SHORTWAVE ENERGY IS PROGGED BY MODELS TO SWING SOUTHEAST OVER
NORTHEAST COLORADO DURING THE LATTER HALF OF THE WEEK...EACH
ACCOMPANIED BY A SFC COLD FRONT. MODELS SHOW ONE BACKING UP
AGAINST THE FRONT RANGE DURING THE DAY WEDNESDAY AND ANOTHER LATE
ON THURSDAY. BEFORE THE RIDGE BREAKS DOWN...THE REGION REMAINS
UNDER THE INFLUENCE OF A WARM AND RELATIVELY DRY NORTH-NORTHWEST
FLOW ALOFT. UPSLOPE/UPVALLEY FLOW INDUCED BY STRONG DAYTIME
HEATING AND STEEP BOUNDARY LAYER LAPSE RATES SHOULD MANAGE TO
GENERATE A FEW LOW TOP T-STORMS MID TO LATE AFTERNOON. BY
EVENING...A SFC BOUNDARY STALLED OUT ACRS THE NORTHEAST CORNER OF
THE STATE COULD SERVE AS A FOCUS FOR A FEW T-STORMS OUT THERE
WHICH MAY LINGER UNTIL THE WEE HRS OF THE MORNING.

LATER THIS WEEK...SHOULD SEE T-STORM CHANCES RISING FOR REASONS
MENTIONED ABOVE AND ALSO IN RESPONSE TO INCREASING PRECIPITABLE
WATER AMOUNTS. COULD SEE ISOLATED T-STORMS PRODUCING HEAVY
RAINFALL ALONG THE FRONT RANGE LATE WEDNESDAY AND POSSIBLY OVER
SOUTHERN PORTIONS OF THE CWA...SUCH AS SOUTH PARK ON THURSDAY.

BY THE WEEKEND...MEDIUM RANGE MODELS SHOW FURTHER WEAKENING OF THE
UPPER RIDGE AS IT SLOWLY MIGRATES OVER THE ROCKY MOUNTAIN REGION.
THIS EASTWARD SHIFT IN THE RIDGE ALLOWS MORE MONSOON MOISTURE TO
STREAM UP OVER THE DESERT SOUTHWEST AND POSSIBLY AS FAR NORTH AS
NORTHERN UTAH AND WYOMING. MAY SEE SOME OF THIS SUBTROPICAL
MOISTURE CURVING SOUTH INTO NORTH CENTRAL COLORADO ON SUNDAY WHICH
COULD ELEVATE THE T-STORM PROBABILITY OVER THE NRN COLORADO MTNS...
FRONT RANGE FOOTHILLS AND NEARBY PLAINS.

TEMPERATURES DURING THE UPCOMING EXTENDED PERIOD START OUT ABOVE
AVERAGE ON TUESDAY WITH HIGHS IN THE LOW TO MID 90S AT LOWER
ELEVATIONS. HIGH COUNTRY READINGS WILL BE QUITE BALMY AS WELL WITH
60S/70S ON THE MTN SLOPES/RIDGES AND 80S ON THE LOWER VALLEY FLOORS.
LOOK FOR SFC TEMPS ON THE PLAINS AND FOOTHILLS TO COOL 5-7 DEG F
ON WEDNESDAY WITH ARRIVAL OF THE COLD FRONT AND INCREASED CLOUD
COVER. DO NOT SEE MUCH IF ANY CHANGE IN MTN/HIGH VALLEY TEMPS.
DURING THE REMAINDER OF THE WEEK...EXPECT FURTHER COOLING WITH
BELOW AVERAGE TEMPS EAST OF THE CONTINENTAL DIVIDE. WEST OF THE
DIVIDE DAILY TEMPS THROUGH SUNDAY ONLY SLIGHTLY COOLER EVEN WITH
THE ANTICIPATED INCREASE IN PRECIP/T-STORM CHANCES. LOOKING EVEN
FURTHER OUT...EARLY NEXT WEEK COULD BE WET/STORMY AROUND HERE WITH
MONSOON MOISTURE FLOWING OVER THE AREA AND YET ANOTHER COLD FRONT
DROPPING IN FROM THE NORTHERN PLAINS. STAY TUNE.

&&

.AVIATION...(FOR THE TAFS THROUGH 00Z MONDAY LATE AFTERNOON)
ISSUED AT 205 PM MDT SUN JUN 28 2015

VFR CONDITIONS WILL PREVAIL THROUGH THE NEXT 24 HOURS...EXCEPT UNDER
THUNDERSTORMS. SCATTERED THUNDERSTORMS ARE EXPECTED TO MOVE ACROSS
THE DENVER AREA BETWEEN 21Z-03Z. GUSTY OUTFLOW WINDS TO 40
KNOTS...SMALL HAIL AND HEAVY RAIN WILL ACCOMPANY THE THUNDERSTORMS.

LIGHT EASTERLY WINDS ARE EXPECTED TO TURN SOUTHERLY BETWEEN 03-06Z.
THERE MAY BE A PERIOD OF WEST TO NORTHWEST WINDS DUE OUTFLOW FROM
THUNDERSTORMS THROUGH 03Z.

FOR MONDAY...MOSTLY SUNNY SKIES ARE EXPECTED TO PREVAIL.
THUNDERSTORM ACTIVITY IS EXPECTED TO REMAIN OVER THE HIGHER TERRAIN
WEST OF DENVER. WINDS WILL AGAIN BE ON THE LIGHT SIDE.

&&

.HYDROLOGY...
ISSUED AT 205 PM MDT SUN JUN 28 2015

HEAVY RAIN WILL BE POSSIBLE FROM THUNDERSTORM THIS AFTERNOON AND
EVENING. THE STORMS WILL BE MOVING AT 15 TO 20 MPH...SO THE
THREAT FOR FLOODING RAINS WILL BE VERY LOW.

ON MONDAY...JUST ISOLATED THUNDERSTORMS ARE EXPECTED OVER THE
MOUNTAINS AND PARK COUNTY. BRIEF HEAVY RAIN WILL BE POSSIBLE WITH
THESE STORMS.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

SHORT TERM...MEIER
LONG TERM...BAKER
AVIATION...MEIER
HYDROLOGY...MEIER

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
1042 AM MDT SUN JUN 28 2015

COZ030>051-290445-
JACKSON COUNTY BELOW 9000 FEET-
WEST JACKSON AND WEST GRAND COUNTIES ABOVE 9000 FEET-
GRAND AND SUMMIT COUNTIES BELOW 9000 FEET-
SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/
NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET-
SOUTH AND SOUTHEAST GRAND/WEST CENTRAL AND SOUTHWEST BOULDER/
GILPIN/CLEAR CREEK/SUMMIT/NORTH AND WEST PARK COUNTIES ABOVE
9000 FEET-LARIMER AND BOULDER COUNTIES BETWEEN 6000 AND 9000 FEET-
JEFFERSON AND WEST DOUGLAS COUNTIES ABOVE 6000 FEET/GILPIN/CLEAR
CREEK/NORTHEAST PARK COUNTIES BELOW 9000 FEET-
CENTRAL AND SOUTHEAST PARK COUNTY-
LARIMER COUNTY BELOW 6000 FEET/NORTHWEST WELD COUNTY-
BOULDER AND JEFFERSON COUNTIES BELOW 6000 FEET/WEST BROOMFIELD
COUNTY-
NORTH DOUGLAS COUNTY BELOW 6000 FEET/DENVER/WEST ADAMS AND
ARAPAHOE COUNTIES/EAST BROOMFIELD COUNTY-
ELBERT/CENTRAL AND EAST DOUGLAS COUNTIES ABOVE 6000 FEET-
NORTHEAST WELD COUNTY-CENTRAL AND SOUTH WELD COUNTY-MORGAN COUNTY-
CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES-
NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN
COUNTY-
SOUTHEAST ELBERT COUNTY BELOW 6000 FEET/SOUTH LINCOLN COUNTY-
LOGAN COUNTY-WASHINGTON COUNTY-SEDGWICK COUNTY-PHILLIPS COUNTY-
1042 AM MDT SUN JUN 28 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL
COLORADO.

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS WILL DEVELOP OVER THE HIGHER TERRAIN THIS
AFTERNOON AND SPREAD EAST ONTO THE FRONT RANGE URBAN CORRIDOR AND
NEAR BY PLAINS LATE THIS AFTERNOON AND EARLY EVENING. THE STORMS
WILL PRODUCE GUSTY WINDS...SMALL HAIL AND BRIEF HEAVY RAIN.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THERE IS A DAILY CHANCE OF SHOWERS AND THUNDERSTORMS OVER THE
MOUNTAINS AND FOOTHILLS THROUGH SATURDAY...AND A SLIGHT CHANCE OF
LATE DAY THUNDERSTORMS ON THE PLAINS THROUGH TUESDAY. STORM
CHANCES ARE EXPECTED TO INCREASE ON THE PLAINS MID TO LATE WEEK AS
HUMIDITY INCREASES WITH MOIST UPSLOPE WINDS BEHIND A COUPLE OF
WEAK FRONTAL SYSTEMS. TEMPERATURES WILL START OUT SLIGHTLY ABOVE
AVERAGE THROUGH TUESDAY...THEN COOL TO BELOW AVERAGE FOR THURSDAY
THROUGH SATURDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.

MEIER/BAKER

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
501 PM MDT SUN JUN 28 2015

COZ038-042-282330-
NORTHEAST WELD COUNTY CO-
LARIMER COUNTY BELOW 6000 FEET/NORTHWEST WELD COUNTY CO-
501 PM MDT SUN JUN 28 2015

...SPECIAL WEATHER STATEMENT...

AT 501 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
HEREFORD...OR 31 MILES SOUTHEAST OF CHEYENNE...MOVING SOUTH AT 25
MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
GROVER...PAWNEE BUTTES...BRIGGSDALE...KEOTA AND HEREFORD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR SUDDEN GUSTY WINDS. SECURE LOOSE OBJECTS AND MOVE TO A
SAFE SHELTER INSIDE A BUILDING OR VEHICLE.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 4060 10438 4098 10446 4099 10397 4062 10381
TIME...MOT...LOC 2301Z 342DEG 24KT 4093 10426

DANKERS

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
546 PM MDT SUN JUN 28 2015

COZ038-042-290030-
NORTHEAST WELD COUNTY CO-
LARIMER COUNTY BELOW 6000 FEET/NORTHWEST WELD COUNTY CO-
546 PM MDT SUN JUN 28 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN WELD COUNTY UNTIL
630 PM MDT...

AT 543 PM MDT...DOPPLER RADAR WAS TRACKING A PAIR OF STRONG
THUNDERSTORMS OVER NORTHEAST WELD COUNTY.  ONE STORM WAS 7 MILES
NORTHEAST OF BRIGGSDALE...OR 33 MILES NORTHEAST OF GREELEY...MOVING
SOUTH AT 25 MPH.  THE OTHER STORM WAS 35 MILES NORTHEAST OF
BRIGGSDALE...MOVING SOUTHEAST AT 20 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
GROVER...NEW RAYMER...HEREFORD...PAWNEE BUTTES...STONEHAM...
BRIGGSDALE AND KEOTA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR SUDDEN GUSTY WINDS. SECURE LOOSE OBJECTS AND MOVE TO A
SAFE SHELTER INSIDE A BUILDING OR VEHICLE.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 4055 10362 4052 10401 4052 10433 4097 10448
      4099 10362
TIME...MOT...LOC 2343Z 342DEG 23KT 4072 10424

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