Lassen-Eastern Plumas-Eastern Sierra Counties Severe Watches & Warnings NOAA Weather Radio

Watches & Warnings

Areal Flood Watch
Issued: 2:39 PM PDT May. 21, 2017 – National Weather Service

... Flood Watch now in effect through Wednesday evening...

The Flood Watch is now in effect 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.

* Creeks and streams will run fast and very cold, bringing the
risk of hypothermia for those without protective gear. Flood
water will likely inundate pasture land, some campgrounds,
cover hiking and biking trails and roads leading into the high
country.

Precautionary/preparedness actions...

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.





Special Statement
Issued: 2:46 PM PDT May. 21, 2017 – National Weather Service


... Snowmelt flooding concerns increase over the eastern Sierra
and western Nevada...

With temperatures rising well above normal through Thursday,
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 stream and Walker, Carson, and Truckee River flooding summary:

* on the west Walker River, minor to moderate flooding is
expected from the Walker River canyon into Antelope Valley and
Smith Valley, as well as downstream through Wilson Canyon.

* On the east Walker River, very minor flooding is possible below
Bridgeport Reservoir. Farther down the river, minor to moderate
flooding is expected from just above strosnider ditch to the
confluence with the west Walker.

* The Walker River through Mason Valley and Yerington is expected
to reach major flood stage. Flooding greater than that
experienced in 1983 and 1986 is expected and may persist for a
prolonged period of time.

* Below Weber Reservoir minor flooding is possible if releases
from the Reservoir need to be increased.

* Small streams draining the eastern Sierra could see flows in
excess of 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 through the city of Truckee and nearby areas. This is
likely to be confined to areas immediately adjacent to the river
with impacts confined to campgrounds and bike trails.


Http://weather.Gov/Reno


246 PM PDT sun may 21 2017


... Snowmelt flooding concerns increase over the eastern Sierra
and western Nevada...

With temperatures rising well above normal through Thursday,
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 stream and Walker, Carson, and Truckee River flooding summary:

* on the west Walker River, minor to moderate flooding is
expected from the Walker River canyon into Antelope Valley and
Smith Valley, as well as downstream through Wilson Canyon.

* On the east Walker River, very minor flooding is possible below
Bridgeport Reservoir. Farther down the river, minor to moderate
flooding is expected from just above strosnider ditch to the
confluence with the west Walker.

* The Walker River through Mason Valley and Yerington is expected
to reach major flood stage. Flooding greater than that
experienced in 1983 and 1986 is expected and may persist for a
prolonged period of time.

* Below Weber Reservoir minor flooding is possible if releases
from the Reservoir need to be increased.

* Small streams draining the eastern Sierra could see flows in
excess of 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 through the city of Truckee and nearby areas. This is
likely to be confined to areas immediately adjacent to the river
with impacts confined to campgrounds and bike trails.


Http://weather.Gov/Reno

Areal Flood Watch
Issued: 2:39 PM PDT May. 21, 2017 – National Weather Service

... Flood Watch now in effect through Wednesday evening...

The Flood Watch is now in effect 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.

* Creeks and streams will run fast and very cold, bringing the
risk of hypothermia for those without protective gear. Flood
water will likely inundate pasture land, some campgrounds,
cover hiking and biking trails and roads leading into the high
country.

Precautionary/preparedness actions...

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.