Area Forecast Discussion
Issued by NWS Reno, NV

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FXUS65 KREV 182125

Area Forecast Discussion
National Weather Service Reno NV
225 PM PDT Thu May 18 2017

Very warm temperatures will increase the rate of snow melt this
weekend and early next week leading to flooding near creeks and
streams leading out of the Sierra. Significant flooding is
possible along the Walker River in the Mason Valley. Some flooding
is also likely for the upper portions of the Carson and Truckee
River systems.


Winter gave us a massive Sierra snowpack and several rounds of
flooding. As we enter the peak melt season, a new round of flood
impacts are about to unfold. The excessive amount of water locked
up in snowpack is going to start to melt this weekend as
temperatures climb to early summer levels in the higher
elevations. Flooding is likely along some small creeks and
streams leading out of the Sierra as early as Sunday, with
flooding spreading into the Carson and Walker River systems.

The warming temperatures will bring the desire to jump in creeks,
streams and rivers to cool off. Unfortunately the water will
be running very fast and very cold. Hypothermia can set in
quickly for those not wearing protective gear. Best advice is to
stay out of the water, it will still be there this summer when
water temperatures are warmer. Hikers heading into the higher
elevations should be mindful of the weakening snow bridges.

The warm temperatures will bring a threat for thunderstorms
Sunday along the Sierra crest. A few late day showers and
thunderstorms may push out over portions of Mineral, Lyon and
Douglas counties as well. Gusty outflow winds, brief heavy rain
and small hail are the main threats. Brong

.LONG TERM...Monday through Wednesday...

Above average temperatures and mountain snowpack melting will
continue next week and flooding is forecast for some areas along
mainstem rivers. Creek and small stream flooding is also expected
for some areas. For further discussion of these dangerous hazards
and their impacts, see the hydrology section below.

The weather pattern for the beginning of the work week involves a
strong high pressure over the western interior with a weak low
pressure off the CA coast. Uncertainty in the forecast for next week
is mostly related to the various possible tracks and evolutions of
the low pressure system as it moves inland. There is higher
confidence in upslope convergence and weak instability over the
Sierra each afternoon. Thus, we maintained chances of thunderstorms
south of the Tahoe Basin each afternoon. JCM



VFR conditions through the rest of the week, with light winds and
mostly clear skies. Expect afternoon cumulus buildups and a chance
for thunderstorms over the Sierra starting Sunday. JCM


.REV Watches/Warnings/Advisories...


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