EXCESSIVE RAINFALL DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
951 PM EDT SUN JUN 06 2010
 
...VALID 03Z MON JUN 07 2010 - 00Z TUE JUN 08 2010...
...REFERENCE AWIPS GRAPHIC UNDER...DAY 1 EXCESSIVE RAINFALL...
 

MID-MISSOURI VALLEY...

CLUSTERS OF SHOWERS AND THUNDERSTORMS HAVE ALREADY DEVELOPED
ACROSS A LARGE AREA OF HIGH PLAINS OF WESTERN NEBRASKA AND
NORTHEAST COLORADO THIS EVENING IN ASSOCIATION WITH A STRONG
SHORTWAVE EXITING THE HIGH PLAINS INVOF SRN WY/NRN CO. THIS LEAD
SHORTWAVE WILL CONTINUE TO MOVE EAST TONIGHT AND MONDAY MORNING
ACROSS CENTRAL AND EASTERN NEBRASKA...STEERED EASTWARD ALONG THE
NORTHERN PERIPHERY OF AN UPPER-LEVEL RIDGE ANCHORED ALONG THE FOUR
CORNERS REGION. BENEATH THIS UPPER-LEVEL RIDGE...RETURN SOUTHEAST
AND SOUTHERLY FLOW WILL INTERACT WITH EXISTING OUTFLOW
BOUNDARIES...REGENERATING CONVECTION...EAST AND SOUTH OF THE
PRIMARY AREA OF CONVECTION. MUCH OF THE CONVECTION THIS EVENING IS
HIGH-BASED CONVECTION WITH LIMITED HEAVY RAINFALL POTENTIAL.
HOWEVER...LOW-LEVEL FLOW AND MOISTURE CONVERGENCE WILL BE ON THE
INCREASE LATER TONIGHT OVER ERN NEBRASKA...WESTERN IOWA...AND
NORTHEAST KANSAS AS THE CLUSTERS OF SHOWERS AND THUNDERSTORMS IN
THE WEST BEGIN TO MIGRATE INTO THE MID-MISSOURI VALLEY.    

CONCERN FOR EXCESSIVE RAINFALL THIS EVENING WILL BE OVER THE
WESTERN CENTRAL PORTION OF NEBRASKA...NORTHEAST COLORADO AND
POSSIBLY EXTREME NORTHWEST KANSAS WITH THE ON-GOING CONVECTION AND
ALONG THE OUTFLOW BOUNDARIES PRODUCED BY THESE THUNDERSTORMS. FOR
EARLY WEDNESDAY MORNING THROUGH THE END OF THE FORECAST
PERIOD...FOCUS SHIFTS TO THE EASTERN HALF OF THE STATE AND
PORTIONS OF WESTERN IOWA AND NORTHERN MISSOURI WHERE RECENT HEAVY
RAINFALLS HAVE SIGNIFICANTLY LOWERED THE SHORT TERM FLASH FLOOD
GUIDANCE VALUES. WITH 6 HOUR RAINFALL AMOUNTS IN THE 0.50 TO 1.50
INCH RANGE POSSIBLE ON WEDNESDAY...LOCALIZED FLOODING OF SMALL
STREAMS AND URBAN AREAS WILL BE A CONCERN OVER EASTERN
NEBRASKA...WESTERN IOWA AND NORTHERN MISSOURI.

VOJTESAK
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