WFO Denver/Boulder


...FLOODING CAN BE A MAJOR PROBLEM ACROSS COLORADO...    

TODAYS TOPIC DURING THIS FLOOD SAFETY AND WILDFIRE AWARENESS WEEK IS FLOODING 
WHICH DEVELOPS IN THE TIME FRAME OF LONGER THAN 6 HOURS TO SEVERAL DAYS.

THERE HAVE BEEN SOME NOTABLE FLOODS ACROSS THE CENTENNIAL STATE...

IN EARLY JUNE OF 1921...A FLOOD ALONG THE ARKANSAS RIVER DEVASTATED THE CITY 
OF PUEBLO. ESTIMATES OF DROWNINGS RANGED FROM OVER 100 TO OVER 300.

AROUND MEMORIAL DAY...1935...CATASTROPHIC FLOODING OCCURRED ON THE PALMER 
DIVIDE AND THE COLORADO SPRINGS AREA...CAUSING MILLIONS OF DOLLARS OF 
DAMAGE...AND KILLING AT LEAST 18 PEOPLE.

THE MID-JUNE 1965 FLOOD WAS WIDESPREAD ACROSS EASTERN COLORADO...TAKING 
SEVERAL LIVES...AND CAUSING OVER 500 MILLION DOLLARS OF DAMAGE.

DURING LATE APRIL AND EARLY MAY OF 1999...AFTER UP TO 14 INCHES OF RAIN 
FELL...A MAJOR FLOOD OCCURRED ACROSS SOUTHEAST COLORADO FROM COLORADO SPRINGS 
TO LA JUNTA.

JUST LAST YEAR...THE HISTORIC RAINS AND FLOODS IN SEPTEMBER CAUSED OVER 3 
BILLION DOLLARS OF DAMAGE...AND TOOK 9 LIVES.

FLOODS IN COLORADO CAN RESULT FROM RAPID SNOW MELT...A COMBINATION OF SNOW 
MELT AND HEAVY RAIN...OR JUST HEAVY RAIN.  

NATIONAL WEATHER SERVICE FORECAST OFFICES IN COLORADO CLOSELY COLLABORATE 
WITH REGIONAL RIVER FORECAST CENTERS THAT MONITOR THE COLORADO RIVER...SOUTH 
PLATTE RIVER...ARKANSAS RIVER...AND RIO GRANDE TO COME TO A CONSENSUS ON THE 
LIKELIHOOD OF FLOODING ALONG RIVERS AND LARGE CREEKS.

THE NATIONAL WEATHER SERVICE WILL DISCUSS FLOOD POTENTIAL IN HYDROLOGIC 
OUTLOOKS...DAILY HAZARDOUS WEATHER OUTLOOKS...AND IN GRAPHICAL WEATHER 
STORIES ON NATIONAL WEATHER SERVICE FORECAST OFFICE WEB SITES. 

HYDROLOGIC STATEMENTS MAY BE ISSUED FOR HIGH FLOWS THAT ARE WITHIN THE BANKS 
OF A RIVER OR LARGE CREEK.

WHEN FLOODING IS POSSIBLE ON A RIVER OR LARGE CREEK...A FLOOD WATCH WILL BE 
ISSUED...MEANING FLOODING IS POSSIBLE WITHIN THE DESIGNATED WATCH AREA.  

WHEN FLOODING IS LIKELY OR OCCURRING ON A RIVER OR LARGE CREEK...A FLOOD 
WARNING WILL BE ISSUED...MEANING FLOODING IS EXPECTED OR HAS BEEN REPORTED AT 
DESIGNATED RIVER FORECAST POINTS. 

FLOOD ADVISORIES MAY BE ISSUED FOR MINOR FLOODING ON RIVERS AND CREEKS.

AN AREAL FLOOD WARNING MAY ALSO BE ISSUED FOR FLOODING ON A RIVER OR LARGE 
CREEK IN AREAS AWAY FROM THE DESIGNATED RIVER FORECAST POINTS. 

YOU CAN EASILY MONITOR POTENTIAL FLOODING ALONG RIVERS IN COLORADO AND LARGE 
CREEKS USING THE ADVANCED HYDROLOGIC PREDICTION SERVICE MONITORING SYSTEM.   
INFORMATION ON THIS MONITORING SYSTEM CAN BE OBTAINED FROM THIS WEB SITE...

HTTP://WWW.NWS.NOAA.GOV/FLOODSAFETY/AHPS.SHTML

THIS MONITORING SYSTEM CAN BE ACCESSED ON COLORADO NATIONAL WEATHER SERVICE 
FORECAST OFFICE WEB SITES FROM THE LEFT HAND MENU...BY CLICKING...RIVERS AND 
LAKES UNDER THE HYDROLOGY BANNER.

AT EACH RIVER AND LARGE CREEK GAUGE...YOU CAN EASILY LOOK AT CURRENT AND 
FORECAST WATER LEVELS...FLOOD CATEGORIES...HISTORIC CRESTS...AND FLOOD 
IMPACTS. PROBABILITIES OF EXCEEDANCE OF CERTAIN WATER LEVELS BY WEEK OR OVER 
THE LONG TERM ARE ALSO AVAILABLE.

IN GENERAL...THERE WILL BE SOME TIME TO PREPARE FOR RIVER AND LARGE CREEK 
FLOODING...AND EMERGENCY MANAGEMENT IN YOUR AREA HAS PLANS IN PLACE TO 
ADDRESS THE FLOODING ISSUES.  KNOW THESE PLANS AND HOW YOU SHOULD ACT 
ACCORDINGLY WHEN FLOOD WATCHES AND FLOOD WARNINGS ARE IN EFFECT.

FOR MORE INFORMATION ON FLOOD SAFETY GO TO...

HTTP://WWW.FLOODSAFETY.NOAA.GOV

THE TOPIC FOR TOMORROW IS LIFE-THREATENING FLOODING WHICH OCCURS VERY 
QUICKLY...FLASH FLOODS.

FLOOD SAFETY AND WILDFIRE AWARENESS WEEK CONTINUES THROUGH THIS SATURDAY.  

TOM MAGNUSON
WARNING COORDINATION METEOROLOGIST
NATIONAL WEATHER SERVICE PUEBLO

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