SLCESGNM Mar, 2006
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FGUS65 KSTR 021929
TTAA00 KSLR DDHHMM
NATIONAL WEATHER SERVICE
COLORADO BASIN RIVER FORECAST CENTER
SALT LAKE CITY UT
MAR 2, 2006
INTERNAL NWS PRODUCT FOR GUIDANCE PURPOSES ONLY
SAN JUAN RIVER BASIN SPRING FLOOD POTENTIAL OUTLOOK
The 2006 spring runoff flood potential is much below average for streams
throughout the San Juan River Basin. The Upper San Juan and Animas River basins
are both suffering one of their worst seasons in the period 1961-2005. The
observed water year precipitation to date is 50% of average. Snow water
equivalents as of March 1 were 40% in the Upper San Juan and 50% in the Animas.
Observed February streamflow was 56% of average. The spring runoff forecasts
range from 5%-63% of average with a median forecast of 40% of average.
Climatically we are currently in a weak La Nina period. The March, April, May
climate forecasts from CPC indicate high probabilities of continued warm and dry
conditions. If this trend verifies flood potential from snow melt runoff will be
It is important to note that the spring flood threat due to snow melt runoff will
largely bedetermined by hydrometeorologic events that occur during the next several
GILA RIVER BASIN SPRING FLOOD POTENTIAL OUTLOOK
The 2006 Water Year continues to be dry with essentially no snow cover at this
time. This far south, snowpack is usually not the primary cause of flooding.
At this time, the flood potential is considered low. Yet, the potential may
quickly change to high in the vicinity of high intensity rainfall.