Spring 2015 Flood Outlook – March 5th Update

(source) – NWS La Crosse

*** FLOOD POTENTIAL HIGHLIGHTS ***

OVERALL...NOT MUCH HAS CHANGED FROM THE FIRST OUTLOOK ISSUED TWO
WEEKS AGO. THE FLOOD POTENTIAL FOR THIS SPRING LOOKS TO BE BELOW
NORMAL AS COMPARED TO A TYPICAL YEAR.

THE WIDESPREAD LACK OF WINTER PRECIPITATION HAS CONTINUED...AND
CONTINUES TO BE WELL BELOW WHAT WE MIGHT NORMALLY SEE FOR THIS
TIME OF YEAR. THIS CONTINUES TO POINT TO A VERY LOW LIKELIHOOD OF
ANY SIGNIFICANT OR WIDESPREAD SPRING FLOODING FROM SNOWMELT RUNOFF
AT THIS TIME.

ONE AREA THAT REMAINS SOMEWHAT OF A CONCERN CONTINUES TO BE THE
AMOUNT AND THICKNESS OF ICE IN AREA CREEKS AND RIVERS. THE RECENT
COLD HAS HELPED TO THICKEN THE ICE. WITH WARMER TEMPERATURES EXPECTED
THIS WEEKEND AND THROUGH NEXT WEEK...RUNOFF MAY BE SUFFICIENT TO
RAISE WATER LEVELS ENOUGH TO BREAK THIS ICE UP ON SOME WATERWAYS.
AS THIS OCCURS...ICE JAMS ARE A DEFINITE POSSIBILITY...ESPECIALLY IN
TYPICAL PROBLEM SPOTS SUCH AS NEAR BRIDGES AND OTHER CONSTRICTIONS
IN THE RIVER...OR WHERE THE RIVER MAKES SHARP TURNS OR MEANDERS.
LARGE CHUNKS OF ICE MOVING DOWNSTREAM COULD GET HUNG UP IN THESE
AREAS...LEADING TO JAMS AND POTENTIAL FLOODING. IF ICE FLOES OR
ANY JAMMING IS OBSERVED...BE SURE TO REPORT THIS INFORMATION TO
LOCAL OFFICIALS OR THE NATIONAL WEATHER SERVICE.

Snow depth, temperature, and water equivalent as of March 5th, 2015:
nsm_swe_2015030505_Upper_Midwest nsm_ave_temp_24hr_2015030505_Upper_Midwest nsm_depth_2015030505_Upper_Midwest

Images courtesy National Snow Analysis

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