NOAA's National Weather Service
Weather Alerts for Greater Lake Tahoe   (CAZ072)

icn  FLOOD WATCH
GREATER LAKE TAHOE   (CAZ072)

Effective: Mon, May 22, 2017 03:19pm PDT Severity: Moderate
Updated: Mon, May 22, 2017 03:19pm PDT Urgency: Future
Expires: Wed, May 24, 2017 12:00am PDT Certainty: Possible

Areas Affected: Greater Lake Tahoe Area; Lassen-Eastern Plumas-Eastern Sierra Counties; Mono
 
Alert:
...FLOOD WATCH REMAINS IN EFFECT THROUGH WEDNESDAY EVENING...
The Flood Watch continues for
* Portions of California and western Nevada, including the
following areas, in California, Greater Lake Tahoe Area,
Lassen-Eastern Plumas-Eastern Sierra Counties, and Mono
County. In western Nevada, Greater Lake Tahoe Area and Greater
Reno-Carson City-Minden Area.
* Through Wednesday evening
* Warming temperatures will accelerate snowpack melt across the
eastern Sierra through early week. Best estimates for flows
this week coming out of unregulated eastern Sierra creeks and
streams are likely to be 2-2.5 times current flows with
smaller creeks likely to see 3 times current flows.
* Daily peak flows on small creeks and streams typically occur
during the evening and overnight hours.
Instructions:
Excessive runoff may also generate rock and mud slides in steep
terrain. Persons living along small creeks and streams should
monitor the latest weather information at weather.gov/reno and be
prepared to take action should flooding occur.

 

icn  SPECIAL WEATHER STATEMENT
GREATER LAKE TAHOE   (CAZ072)

Effective: Mon, May 22, 2017 03:43pm PDT Severity: Minor
Updated: Mon, May 22, 2017 03:43pm PDT Urgency: Expected
Expires: Wed, May 24, 2017 12:00am PDT Certainty: Observed

Areas Affected: Greater Lake Tahoe Area; Lassen-Eastern Plumas-Eastern Sierra Counties; Mono
 
Alert:
...Snowmelt Flooding Concerns Increase Over the Eastern Sierra
and Western Nevada...
With temperatures rising well above normal through Wednesday,
snowmelt will accelerate across the eastern Sierra. The increase
in snowmelt will cause daily rises in many small streams from Mono
County north through the northern Sierra. Snowmelt flow typically
peaks in smaller streams late in the evening or overnight.
Farther downstream flows will continue to increase through next
week as the smaller streams add water to the main rivers.
Small streams, and Walker, Carson, and Truckee River flooding
summary:
* On the WEST WALKER RIVER, minor flooding is expected from the
Walker River Canyon into Antelope Valley and high flows through
Smith Valley and downstream through Wilson Canyon. There is
minor flooding occurring just below Wilson Canyon.
* On the EAST WALKER RIVER, minor flooding is ongoing and
expected to continue from just above Strosnider Ditch to the
confluence with the West Walker.
* The WALKER RIVER THROUGH MASON VALLEY AND YERINGTON is expected
to crest just below moderate flood stage. Minor flood stage
will be reached Wednesday morning and flow will peak out late
Friday.
* No flooding is expected below Weber Reservoir at this time.
* SMALL STREAMS draining the eastern Sierra could see flows in
excess of 2 to 3 times their current flows causing flooding
near the streams from southern Mono County north through the
Tahoe Basin and into parts of Sierra and Plumas Counties.
* The upper parts of the CARSON RIVER...INCLUDING THE SOUTHWEST
CARSON VALLEY...are likely to experience minor flooding of farm
and ranch lands.
* The TRUCKEE RIVER will likely see minor flooding below Lake
Tahoe to Truckee along Highway 89 and nearby areas. This is
likely to be confined to areas immediately adjacent to the river
with impacts confined to campgrounds and bike trails.