Severe Thunderstorm Warning 11, NWS Reno, NV

119 
WWUS55 KREV 230126
SVSREV

Severe Weather Statement
National Weather Service Reno NV
626 PM PDT SUN JUL 22 2018

CAC003-017-061-NVC005-031-510-230145-
/O.CON.KREV.SV.W.0011.000000T0000Z-180723T0145Z/
Alpine CA-Placer CA-El Dorado CA-Washoe NV-Douglas NV-Carson City NV-
626 PM PDT SUN JUL 22 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM PDT
FOR ALPINE...PLACER...EL DORADO...SOUTHERN WASHOE...AND DOUGLAS
COUNTIES AND WESTERN CARSON CITY...

At 625 PM PDT, a severe thunderstorm was located near Sugar Pine
Point S, or 7 miles northwest of South Lake Tahoe, moving north at 15
mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, fencing and trees.

Locations impacted include...
South Lake Tahoe, Dagget Pass, Bliss State Park, Glenbrook, Zephyr 
Cove, Emerald Bay, Zephyr Cove-Round Hill Village, Sugar Pine Point 
S, Kingsbury, Incline Village-Crystal Bay, Homewood, South Lake 
Tahoe Airport, William Kent Campground, Stateline, Heavenly Valley, 
Meeks Bay, Fallen Leaf Campground, Meeks Bay Campground and 
Sunnyside-Tahoe City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

If on or near Lake Tahoe, get away from the water and move indoors 
or inside a vehicle. remember, lightning can strike out to 15 miles 
from the parent thunderstorm. If you can hear thunder, you are close 
enough to be struck by lightning. Move to safe shelter now!  Do not 
be caught on the water in a thunderstorm.

&&

LAT...LON 3922 11993 3892 11988 3889 12000 3887 12015
      3894 12019 3914 12024
TIME...MOT...LOC 0125Z 162DEG 11KT 3903 12006 

HAIL...1.00IN
WIND...60MPH
 
$$

CJ

154 
WWUS55 KREV 230139
SVSREV

Severe Weather Statement
National Weather Service Reno NV
639 PM PDT SUN JUL 22 2018

CAC003-017-061-NVC005-031-510-230148-
/O.EXP.KREV.SV.W.0011.000000T0000Z-180723T0145Z/
Alpine CA-Placer CA-El Dorado CA-Washoe NV-Douglas NV-Carson City NV-
639 PM PDT SUN JUL 22 2018

...THE SEVERE THUNDERSTORM WARNING FOR ALPINE...PLACER...EL DORADO...
SOUTHERN WASHOE...AND DOUGLAS COUNTIES AND WESTERN CARSON CITY WILL
EXPIRE AT 645 PM PDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 3922 11993 3892 11988 3889 12000 3887 12015
      3894 12019 3914 12024
TIME...MOT...LOC 0138Z 162DEG 11KT 3906 12007 

$$

CJ

Area Forecast Discussion
National Weather Service Reno NV
1251 PM PDT Sun Jul 22 2018

.SYNOPSIS...

Showers and thunderstorms will persist early this week with the
best coverage along the eastern Sierra from Mono and Alpine
Counties northward to the Sierra Front of western Nevada. Locally
heavy rain will keep the flash flood potential around at least
through Monday. High pressure will build mid to late week for a
decrease in thunderstorms and a return to hot temperatures.

&&

.SHORT TERM...

As expected, moisture continues to stream northward with this
morning's 12z KREV sounding measuring PWAT values of 1.01". While
this is not a daily record, it does fall in line with the normalized
maximum moving average for the day. Thunderstorms are again
developing today with heavy rainfall the greatest threat due to
high moisture values and slow storm motions. The south southwest
flow will focus development along the Sierra into the Sweetwater,
Pine Nut, Virginia, and Pah Rah Ranges. A Flash Flood Watch
remains in effect for these areas with the greatest concern being
over steep terrain, recent burn scars, and locations which
received significant rainfall yesterday.

There are many outdoor festivals and sporting events occurring this
weekend, so please pay close attention to the weather surrounding
you. Some things to keep in mind -- if you can hear thunder, you are
close enough to be struck by lightning. Nowhere outside is safe
during a thunderstorm. Also, heavy rain can drop temperatures by 30
degrees in a short period of time. This can easily catch
campers/backpackers off guard, so prepare for wet weather.

Storms should once again be fairly widespread on Monday as another
impulse lifts through the region and moisture remains high. There
are some timing differences on this impulse, with the differences
being between Monday afternoon and Monday evening. Either way, this
will help to bring additional forcing to storm development with the
later scenario bringing an increased late day or nocturnal
thunderstorm risk. These storms are likely to produce localized
heavy rainfall, similar to what we saw this weekend.

By Tuesday, the high pressure center begins to retrograde westward,
which will bring drier southwest flow to areas closer to the Oregon
border and begin to lessen the thunderstorm risk for areas north
of I-80. The one exception would be lingering surface moisture
and localized convergence which could produce a few cells in
Lassen-Northern Washoe County.

Smoke and haze mainly from the Ferguson Fire in California will
continue to impact the region, with the density dependent on how
actively the fire burns. The other wild card is thunderstorm
outflows which can either help to clear the air or in some cases,
push additional smoke into areas downwind of the fire. - Dawn

.LONG TERM...Wednesday through Sunday...

No major changes to the forecast today. The ridge of high pressure
will be centered over the desert southwest with hot temperatures and
fewer thunderstorms. The ridge is forecast to flatten out later in
the week with less thunderstorm coverage for the latter half of the
week. By Wednesday, drier southwest flow will start to move into
the region likely pushing the thunderstorm threat south of I-80.
Thursday through Saturday storms should be held to mainly
Mono/Mineral counties as drier air continues to works in.

With the ridge of high pressure remaining over the region, and
thunderstorm coverage lessening for the second half of the week,
temperature will again push into the triple digits in western
Nevada. By around the end of next weekend, southerly flow could
allow moisture to begin to work back into the region with
thunderstorm coverage again expanding into northwest Nevada and the
northern Sierra, but it will depend on just how quickly the ridge
re-builds over the area. -Zach

&&

.AVIATION...

Thunderstorm coverage is increasing over the Sierra Front, with
storms expected to continue through 03Z. Terminals that could be
affected by thunderstorms include KMMH, KMEV, KCXP, KRNO, and KRTS,
with these terminals having a 50-60% chance of taking a direct hit
from a thunderstorm. Terminal areas including KTVL/KTRK/KSVE will
have lower chances (30-40%) of being directly affected by
thunderstorms. Erratic outflow winds to 45 kts, heavy rain, and
small hail will be the main concerns today. Storms could also
obscure the terrain. Monday's thunderstorm chances will be
similar to today.

With regards to the smoke from the Ferguson Fire, visibility will
likely remain VFR today, but haze can be expected for all terminal
areas. Precipitation and outflow winds from this afternoon's
thunderstorms will help to mix out the smoke particulates in the
air. -Johnston

&&

.REV Watches/Warnings/Advisories...
NV...Flash Flood Watch until 9 PM PDT this evening NVZ002-003.

CA...Flash Flood Watch until 9 PM PDT this evening CAZ072-073.

&&

For more information from the National Weather Service visit...
http://weather.gov/reno

Special Weather Statement
National Weather Service Reno NV
545 PM PDT SUN JUL 22 2018

CAZ072-NVZ002-230130-
Greater Lake Tahoe Area CA-Greater Lake Tahoe Area NV-
545 PM PDT SUN JUL 22 2018

...STRONG THUNDERSTORM LOCATED OVER SOUTH LAKE TAHOE...

At 544 PM PDT, Doppler radar was tracking a strong thunderstorm over
South Lake Tahoe, moving north at 10 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
South Lake Tahoe, Dagget Pass, Spooner Summit, Bliss State Park,
Meyers, Kingsbury, Glenbrook, Zephyr Cove, Emerald Bay, Zephyr
Cove-Round Hill Village, Sugar Pine Point S, South Lake Tahoe
Airport, Stateline, Heavenly Valley, Meeks Bay, Fallen Leaf
Campground and Meeks Bay Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If on or near Lake Tahoe, get out of the water and move indoors or
inside a vehicle. Remember, lightning can strike out to 10 miles
from the parent thunderstorm. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now! Do not
be caught on the water in a thunderstorm.

&&

LAT...LON 3914 11987 3886 11985 3883 11997 3882 12006
      3883 12011 3895 12018 3906 12021
TIME...MOT...LOC 0044Z 168DEG 11KT 3891 11999

CJ