Flash Flood Warning 18, NWS Denver/Boulder, CO

602 
WGUS75 KBOU 121429
FFSBOU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
829 AM MDT FRI JUN 12 2015

COC035-121900-
/O.CON.KBOU.FF.W.0018.000000T0000Z-150612T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DOUGLAS CO-
829 AM MDT FRI JUN 12 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 100 PM MDT FOR
DOUGLAS COUNTY...

AT 820 AM MDT...DOPPLER RADAR AND AUTOMATED RAIN GAUGES CONTINUED TO 
INDICATE MODERATE TO HEAVY RAIN FALLING OVER DOUGLAS COUNTY.  FLASH 
FLOODING IS EXPECTED TO BEGIN SHORTLY.  FROM ONE TO TWO INCHES OF 
RAIN HAS FALLEN OVER THE CASTLE ROCK AREA SINCE 5 AM THIS MORNING.  
THIS RAIN IS FALLING ON GROUND ALREADY SATURATED BY THE HEAVY RAIN 
THAT FELL LAST EVENING.  RAPID RISES ON EAST PLUM CREEK HAVE ALREADY 
BEEN OBSERVED IN THE CASTLE ROCK AREA.  

A FLOOD WAVE WILL CONTINUE MOVING DOWN PLUM CREEK THIS 
MORNING...REACHING SEDALIA BEFORE 10 AM.  HIGH WATERS WILL CONTINUE 
MOVING DOWN PLUM CREEK THROUGH THIS AFTERNOON.  

THE RAIN IS EXPECTED TO TAPER OFF AFTER 9 AM THIS MORNING.  RUNOFF 
FROM THIS RECENT RAIN WILL KEEP PLUM CREEK RUNNING HIGH THROUGH THIS 
AFTERNOON.  ADDITIONAL RAIN SHOWERS THIS AFTERNOON WILL ALSO PRODUCE 
RAPID RUNOFF INTO THIS EVENING. 

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
HIGHLANDS RANCH...CASTLE ROCK...PARKER...LONE TREE...ROXBOROUGH
PARK...LARKSPUR...FRANKTOWN...SEDALIA...GREENLAND...THE PINERY...
SPRUCEWOOD...LOUVIERS...PERRY PARK...DEVILS HEAD...WESTCREEK...SURREY
RIDGE AND BEVERLY HILLS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

&&

LAT...LON 3915 10467 3913 10521 3956 10506 3956 10468

$$

DANKERS

404 
WGUS75 KBOU 121832
FFSBOU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
1230 PM MDT FRI JUN 12 2015

COC035-121840-
/O.CAN.KBOU.FF.W.0018.000000T0000Z-150612T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DOUGLAS CO-
1230 PM MDT FRI JUN 12 2015

...THE FLASH FLOOD WARNING FOR DOUGLAS COUNTY IS CANCELLED...

RAIN HAS ENDED. FLOOD WATERS HAVE RECEDED...AND ARE NO LONGER 
EXPECTED TO POSE A THREAT TO LIFE OR PROPERTY. PLEASE CONTINUE TO 
HEED ANY ROAD CLOSURES.

LAT...LON 3915 10467 3913 10521 3956 10506 3956 10468

$$

TH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
312 AM MDT FRI JUN 12 2015

.SHORT TERM...(TODAY THROUGH TONIGHT )
ISSUED AT 312 AM MDT FRI JUN 12 2015

UPPER LEVEL OVER COLORADO WILL SHIFT EAST ACROSS THE STATE TODAY
AND INTO KANSAS AND NEBRASKA TONIGHT. A LARGE AREA OF SHOWERS AND
THUNDERSTORMS HAS MOVED ONTO THE PLAINS OF KANSAS...OKLAHOMA AND
TEXAS. BEHIND IT OVER COLORADO...JUST SCATTERED SHOWERS EXIST.
EXPECTED SCATTERED SHOWERS TO CONTINUE THROUGH THE MORNING HOURS
ACROSS THE AREA.

AIRMASS BECOME SLIGHTLY UNSTABLE THIS AFTERNOON WITH CAPES UP TO
500 J/KG OVER PARTS OF THE AREA. IT WILL REMAIN MOIST...SO WILL
KEEP SCATTERED SHOWERS AND THUNDERSTORMS IN THE FORECAST. DRIER
AIR WILL BE MOVING IN FROM THE NORTHWEST THIS AFTERNOON BEHIND THE
LOW...SO WILL HAVE LOWER POPS OVER NORTHERN PARTS OF THE AREA. THE
THREAT FOR HEAVY RAIN WILL BE LOWER TODAY DUE TO DRYING AND FEWER
AND WEAKER THUNDERSTORMS.

AS THE UPPER LEVEL LOW MOVES EAST OF THE STATE TONIGHT...DRIER
WILL MOVE INTO THE AREA BEHIND IT. SHOWERS AND STORMS ARE EXPECTED
TO COME TO AN END THIS EVENING.

.LONG TERM...(SATURDAY THROUGH THURSDAY)
ISSUED AT 312 AM MDT FRI JUN 12 2015

SATURDAY THROUGH SUNDAY A DISORGANIZED SET OF UPPER LEVEL TROUGHS
WILL BE OVER THE SOUTHWEST REGION. MODELS CONTINUE TO INDICATE
WEAK WEST TO NORTHWEST FLOW ALOFT. MOISTURE REMAINS HIGH OVER
COLORADO BRINGING A CHANCE OF AFTERNOON SHOWERS AND THUNDERSTORMS
TO NE COLORADO. HIGHS WILL INCREASE INTO THE LOWER 80S FOR THE
WEEKEND WITH DEWPOINTS HOVERING AROUND MID 50S. WEAK UPSLOPE
PROVIDED BY A LEE SIDE TROUGH AND SURFACE HIGH PRESSURE OVER THE
WEST WILL ALLOW FOR MUCH OF THE CONVECTION TO TAKE PLACE CLOSER TO
THE FOOTHILLS.

FOR SUNDAY NIGHT THROUGH MONDAY AN UPPER LEVEL TROUGH WILL DIP
SOUTH PUSHING A SURFACE FRONT OVER THE PLAINS. THIS WILL BRING
INCREASED SHOWERS TO THE NE PLAINS AS WELL AS DROP TEMPERATURES
BACK INTO THE 70S FOR MONDAY. UPPER AIR SOUNDING SHOW SOME COOLING
ALOFT WITH INCREASE INSTABILITY MONDAY AFTERNOON THAT COULD LEAD
TO SOME CONVECTIVE STORMS OVER THE PLAINS.

TUESDAY THROUGH THURSDAY INCREASED WESTERLY FLOW ALOFT WILL BRING
ZONAL FLOW OVER COLORADO. MOISTURE WILL LINGER ENOUGH TO ALLOW FOR
A SLIGHT CHANCE OF AFTERNOON SHOWERS AND THUNDERSTORMS BUT LESS IN
COVERAGE THEN SEEN IN PREVIOUS DAYS. TEMPERATURES WILL REBOUND
BACK INTO THE UPPER 70S AND LOWER TO MID 80S BY THURSDAY.

&&

.AVIATION...(FOR THE TAFS THROUGH 12Z SATURDAY MORNING)
ISSUED AT 312 AM MDT FRI JUN 12 2015

RAIN SHOWERS HAVE DISSIPATED FOR THE TIME BEING BUT CEILINGS WILL
FLUCTUATE BETWEEN IFR AND MFR THROUGH THE EVENING WITH ANOTHER
CHANCE OF LIGHT RAIN FROM 12 TO 15Z. CONDITIONS WILL SLOWLY
IMPROVE DURING THE MORNING HOURS WITH SOME CONVECTION POSSIBLE
LATE AFTERNOON SO WILL MAINTAIN THE PROB 30 FOR NOW. CEILINGS ARE
FORECASTED TO BECOME VFR BY 02Z WITH WINDS SWITCHING TO A MORE
DIURNAL PATTERN BY 06Z TONIGHT INTO TOMORROW.

&&

.HYDROLOGY...
ISSUED AT 312 AM MDT FRI JUN 12 2015

THREAT FOR HEAVY RAIN HAS ENDED AND THE FLASH FLOOD WATCH HAS
BEEN CANCELED. RAIN FROM YESTERDAY'S SHOWERS AND STORMS CAUSE MANY
RIVER AND CREEKS TO RISE AND FLOOD. MOST OF THE SMALLER CREEKS AND
STREAMS ARE BACK IN THEIR BANKS. MINOR FLOODING IS EXPECTED TO
CONTINUE ALONG PARTS OF THE MAIN RIVERS. THERE ARE MANY FLOOD
ADVISORIES AND WARNING IN EFFECT TO COVER THIS.

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TODAY...MAINLY
OVER SOUTHERN PARTS OF THE AREA. BRIEF HEAVY RAIN WILL BE
POSSIBLE. HOWEVER...STORMS WILL BE WEAKER TODAY DUE TO LESS
MOISTURE AND INSTABILITY.

RIVERS WILL CONTINUE TO RUN HIGH WITH PREVIOUS RAINFALL AND
SNOWMELT. AFTERNOON SHOWERS AND THUNDERSTORMS THROUGH THE EXTENDED
PERIOD ALTHOUGH DECREASED IN CONVERGE COULD STILL CONTRIBUTE TO
HIGHER FLOWS.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH UNTIL NOON MDT TODAY FOR COZ036-041-046-047.

&&

SHORT TERM...MEIER
LONG TERM...BOWEN
AVIATION...BOWEN
HYDROLOGY...BOWEN/MEIER

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
400 AM MDT FRI JUN 12 2015

COZ030>051-131000-
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-
400 AM MDT FRI JUN 12 2015

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

.DAY ONE...TODAY AND TONIGHT

AN UPPER LEVEL LOW PRESSURE SYSTEM WILL MOVE ACROSS COLORADO
TODAY AND BRING SCATTERED SHOWERS AND THUNDERSTORMS ALONG WITH
COOL TEMPERATURES. BRIEF HEAVY RAIN AND SMALL HAIL WILL BE
POSSIBLE WITH THE THUNDERSTORMS. THE LOW WILL MOVE EAST OF THE
AREA TONIGHT BRINGING DRIER CONDITIONS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

TEMPERATURES WILL INCREASE THIS WEEKEND WITH AFTERNOON AND
EVENING SHOWERS AND THUNDERSTORMS POSSIBLE BOTH DAYS. STORMS FOR
THE WEEK WILL BE MORE ISOLATED BUT YOU CAN EXPECT A SLIGHT CHANCE
OF AFTERNOON SHOWERS OR THUNDERSTORMS EACH DAY WITH HIGHS IN THE
70S AND UPPER 80S BY THURSDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.