Slip-Sliding Away
"Rainfall of 2 to 5 inches over western Washington lowlands and up
to 10 inches over the mountains from the storm this last weekend has
resulted in high levels of soil moisture around western
Washington. This amount of rain will put extra pressure on soil
instability leading to an increased risk of landslides. The
elevated risk will persist over the next day or two.
As of early this afternoon... 29 landslides from this storm have
been reported in western Washington. 17 landslides have impacted
city or County roads... 7 have impacted highways... 3 impacted
railways... 2 impacted homes... and 2 impacted powerlines.
Cumulative rainfall over the last three weeks have increased soil
wetness to the point where they are above the USGS landslide
index. When cumulative rainfall over the previous three days and
previous eighteen days combine to exceed the USGS landslide
cumulative threshold index... rainfall induced landslides are
possible during intense rainfall or when rainfall amounts exceed
two inches in 24 hours. A diminishing risk of landslides will
continue for several days after the rain ends."
to 10 inches over the mountains from the storm this last weekend has
resulted in high levels of soil moisture around western
Washington. This amount of rain will put extra pressure on soil
instability leading to an increased risk of landslides. The
elevated risk will persist over the next day or two.
As of early this afternoon... 29 landslides from this storm have
been reported in western Washington. 17 landslides have impacted
city or County roads... 7 have impacted highways... 3 impacted
railways... 2 impacted homes... and 2 impacted powerlines.
Cumulative rainfall over the last three weeks have increased soil
wetness to the point where they are above the USGS landslide
index. When cumulative rainfall over the previous three days and
previous eighteen days combine to exceed the USGS landslide
cumulative threshold index... rainfall induced landslides are
possible during intense rainfall or when rainfall amounts exceed
two inches in 24 hours. A diminishing risk of landslides will
continue for several days after the rain ends."
-Special Weather Statement
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