Flash Flood Warning 3, NWS Reno, NV

830 
WGUS75 KREV 090051
FFSREV

Flash Flood Statement
National Weather Service Reno NV
551 PM PDT Sat Aug 8 2026

CAC051-090145-
/O.CON.KREV.FF.W.0003.000000T0000Z-260809T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mono CA-
551 PM PDT Sat Aug 8 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM PDT THIS
EVENING FOR CENTRAL MONO COUNTY...

At 551 PM PDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1 and 3 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar indicated.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Twin Lakes, Robinson Creek Campground and Trumbull Lake Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.

&&

LAT...LON 3821 11948 3821 11922 3799 11922 3799 11932
      3802 11930 3804 11931 3805 11932 3807 11933
      3808 11935 3809 11938 3811 11940 3811 11942
      3812 11943 3809 11944 3810 11946 3811 11946
      3812 11947 3813 11947 3813 11948

FLASH FLOOD...RADAR INDICATED

$$

897 
WGUS75 KREV 090144
FFSREV

Flash Flood Statement
National Weather Service Reno NV
644 PM PDT Sat Aug 8 2026

CAC051-090154-
/O.EXP.KREV.FF.W.0003.000000T0000Z-260809T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mono CA-
644 PM PDT Sat Aug 8 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 645 PM PDT THIS EVENING FOR
CENTRAL MONO COUNTY...

Flash flooding is no longer expected to pose a threat. Please
continue to heed remaining road closures. A new Flood Advisory has
been issued in case any lingering flooding continues going into the
evening.

&&

LAT...LON 3821 11948 3821 11922 3799 11922 3799 11932
      3802 11930 3804 11931 3805 11932 3807 11933
      3808 11935 3809 11938 3811 11940 3811 11942
      3812 11943 3809 11944 3810 11946 3811 11946
      3812 11947 3813 11947 3813 11948

$$

MRC

Area Forecast Discussion
National Weather Service Reno NV
1227 PM PDT Sat Aug 8 2026

.KEY MESSAGES...

* Dangerous heat persists through the weekend across western
  Nevada and lower Sierra valleys, with a gradual cooling trend
  expected next week.

* Isolated to scattered afternoon showers and thunderstorms this
  afternoon and Sunday, with increasing coverage and chances by
  mid-week.

* Breezy conditions will increase Sunday and Monday afternoons,
  elevating fire weather concerns and creating choppy lake waters.

&&

.DISCUSSION...

The synoptic pattern for the short term remains dominated by a
broad upper-level ridge centered over the Great Basin, maintaining
a hot and dry airmass across the region. Monsoonal moisture
continues to advect into the area from the south on the periphery
of the high pressure, providing fuel for afternoon convection the
next several days.

Dangerous heat will persist through the weekend. High
temperatures today and Sunday will reach the upper 90s to low 100s
across western Nevada valleys, with some areas potentially
exceeding 105F, especially in lower desert sinks. Lower Sierra
valleys and foothills will see highs in the 90s, while Lake Tahoe
and higher elevations of the eastern Sierra will be in the upper
80s to low 90s. Overnight lows will offer little relief, generally
remaining in the upper 60s to low 70s in the valleys,
contributing to widespread Moderate to Major HeatRisk across the
region. Heat Advisories and an Extreme Heat Warning remain in
effect through Monday morning. A gradual cooling trend will begin
on Monday, with highs dropping by 10 degrees by Wednesday.

Isolated to scattered afternoon showers and thunderstorms are
expected today and Sunday. Convection will primarily be focused on
the eastern Sierra, S Lyon, and Mineral counties (20-30%). Lower
chances for showers and thunderstorms will be possible farther
north along the Sierra Front this afternoon around 10-20%. High
DCAPE (1600-1800 J/kg) support the potential for strong outflow
winds (45-55 mph gusts) as the primary hazard with any storms that
develop. PWATs around 0.60-0.90" are sufficient for brief heavy
rainfall, especially in areas with antecedent moisture. Coverage
is expected to decrease slightly on Monday as drier air begins to
filter in from the west, though isolated activity will likely
continue for the eastern Sierra and Mineral County.

Afternoon breezes will increase through the weekend. Westerly to
southwesterly winds of 10-15 mph with gusts up to 30 mph are
expected Sunday afternoon and evening, particularly along the
Sierra Front and in northern Washoe County. These increased
winds, combined with hot and dry conditions, will elevate fire
weather concerns. Smoke from Pacific Northwest wildfires may also
be directed into Lassen and N Washoe counties during overnight
hours Sunday into Monday.

Looking ahead to next week, the upper-level ridge is forecast to
gradually shift eastward, allowing for a more zonal flow pattern
to develop across the region by mid-week. Monsoonal moisture is
expected to increase significantly mid-week, leading to higher
chances and coverage of showers and thunderstorms, especially
Wednesday through Friday. While the primary threat will likely
remain strong outflow winds, the increased moisture and slower
storm motions could lead to localized flash flood concerns,
especially in Mono County.

-Justin

&&

.AVIATION...

Showers and thunderstorms return to the forecast this afternoon
for KMMH, KHTH, and the Sierra Front. Chances from KRNO to KMEV
are 15%, and increase to 30% over KMMH. Probabilities for showers
and thunderstorms become confined to Mono/Mineral counties Sunday
afternoon, with similar chances.

Smoke filtering down into far NW NV and NE CA from wildfires in
Oregon may reduce slantwise visibilities across those areas.
Conditions are expected to improve in the afternoon hours due to
wind mixing it out, then smoke will settle in the overnight hours.
This will likely continue through this weekend into Monday.

Otherwise, widespread VFR conditions and typical afternoon
breezes prevail this weekend with continued heat posing density
altitude concerns.

-Justin

&&

.FIRE WEATHER...

Typical afternoon zephyr breezes out of the west this afternoon
and Sunday with gusts up to 30 mph across the Sierra Front, N
Washoe, and Lassen counties. This will combine with significant
triple-digit heat to create elevated fire weather concerns this
weekend. Warm overnight temperatures of more than 70 degrees in
lower NV valleys will yield poor RH recoveries through Sunday
morning.

In addition, isolated dry thunderstorms are possible today and
Sunday along the Sierra Front and eastern Sierra over Mono/Mineral
counties due to fast storm motions of 15-20kt. Chances for dry
t-storms next week will be limited to Mono/S Lyon/Mineral
counties for the most part, though location and storm motion
uncertainty increases as we head into mid-week.

-Justin

&&

.REV Watches/Warnings/Advisories...
NV...Heat Advisory until 8 AM PDT Monday NVZ001-003-005.

     Extreme Heat Warning until 8 AM PDT Monday NVZ004.

CA...Heat Advisory until 8 AM PDT Monday CAZ070-071.

&&