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California, San Bernardino County-Upper Colorado River Valley

Record Report

Statement as of 11:08 AM PDT on August 04, 2015


... All-time 24 hour precipitation record set at Dyer...

A total of 3.07 inches of precipitation fell at the co-op weather
station at Dyer, Nevada for the 24 hour period ending at 6 am on
Sunday, August 2nd. This set an all-time record for any month of the
year. The previous record was 2.05 inches for the period ending on
August 10, 1983.

Records at Dyer date back to 1903.

The above information is preliminary and subject to a final review.
For final certified data please contact the office of noaa's
National centers for environmental information (ncei) located in
Asheville, North Carolina.


Public Information Statement

Statement as of 2:47 PM PDT on August 04, 2015


... A break from the heat but not the monsoon during July 2015...

Following an exceptionally warm June, July flipped things back to a
cooler regime, however, it came with a price in terms of an active
monsoon. There were several lengthy pushes of monsoon moisture into
the Mojave Desert and southern Great Basin during the month which
resulted in an active month across much of the area. All official
weather stations reported at least a trace of precipitation for the
month.

The highest temperatures of the month were recorded mainly between
the 1st and the 5th and in a few spots on the 27th and 29th. The
lowest readings of the month were set mainly between the 10th and
13th, 18th and 19th or between the 25th and 27th.

The first push of monsoon moisture arrived on June 28th and lasted
until July 11th. During the early morning of July 1st, a strong
outflow boundary pushed west across western Mohave, southern Clark
and southern Nye counties. A carport was damaged in Bullhead City,
Arizona and a metal shade awning was blown over here. Wind damage to
trees and downed Mobile home awnings along with power outages was
also reported in Topock, Arizona. Wind gusts of 100 mph were
measured at an automated weather station at the Hoover dam bypass
bridge and 73 mph in southeastern Clark County near Big Bend. Wind
gusts of 58 mph or greater were also clocked at Sloan and Amargosa
Valley, Nevada as well as on the Nevada National security site.
During the evening hours that same day, a thunderstorm dropped up to
penny size hail near Cane Beds, Arizona flattening crops and also
produced high enough winds to knock a tree onto a house. State Route
318 was also closed near Hiko, Nevada due to flash flooding.

Flash flooding impacted roads in Lincoln County, Nevada near Rachel
on the 2nd and near Ursine on the 3rd. A few roads also flooded on
Inyo and San Bernardino counties in California on July 5th and 6th
as well as in Mohave County, Arizona. A thunderstorm dropped hail up
to a half-inch in diameter at the Schulman Grove visitor center in
the Ancient Bristlecone Pine Forest on the afternoon of the 5th for
about 45 minutes. The hail was enough to significantly coat the
ground.

A cold area of low pressure moved west from the Pacific across
California on the 8th and 9th triggering showers and thunderstorms
in Inyo and Esmeralda counties. This storm was cold enough to bring
very high elevation snow with it. Due to the low freezing levels,
several reports of hail were received in the eastern slopes of the
southern Sierra of California on the 9th. Hail up to nickle size
fell at Aspendell as well as at the Whitney Portal campground. Flash
flooding was also reported in the Panamint Valley of California on
the afternoon and early evening of the 9th as well as near Dyer,
Nevada.

The second push of moisture arrived on July 17th in the form of a
Gulf surge. This triggered showers and thunderstorms starting later
that afternoon. Thunderstorms pounded Needles, California on the
afternoon and evening of the 17th. One person was injured by
lightning after they were indirectly struck exiting a jet ski area.
A 64 mph wind gust was measured at the Airport. The wind was strong
enough to blow over one semi-truck on Interstate 40 and cause minor
roof damage to a building. Trees were also reported down and flash
flooding closed some roads in and around the city. Later that
evening, thunderstorms knocked down a total of 36 power poles near
Mohave Valley, Arizona. Outflow winds brought blowing dust as far
north as Joshua Tree, California where it dropped visibility to a
quarter of a mile. A thunderstorm also impacted the Laughlin, Nevada
and Bullhead City, Arizona area with wind gusts of 60 mph or more
and flooded several roads. A total of 1.50 inch of rain was measured
at one automated weather station in Laughlin in 90 minutes.
Lightning also knocked out power in Bullhead City.

The following day, showers and thunderstorms again pounded parts of
the area on July 18th. A 61 mph wind gust was measured at Needles,
California at the Airport. Flash flooding took place on Highway 62
east of Twentynine Palms, California and also impacted a number of
roads in Mohave County, Arizona. A large dust storm also formed in
Death Valley, California and plunged visibility to a quarter of a
mile.

The remnants of Pacific Hurricane Dolores triggered showers and
thunderstorms across the area on July 19th and 20th, especially in
southeast California. Several roads were flooded in and around
Joshua Tree, California as well as near Nipton, California. Two
landspouts formed in the evening near Landers, California with both
spouts visible in a photo together at the same time. Early on the
morning of July 20th, storms moved north across Mohave County,
Arizona triggering flash flooding near Temple Bar and on Stockton
Hill Road. Drier air moved back on in on the 20th and 21st.

The final push of monsoon moisture arrived on July 29th and lasted
through the end of the month. Thunderstorms again impacted the
morongo basin of California on July 29th with more flash flooding
and lightning knocked out power to customers. Blowing dust plunged
visibility to a quarter of a mile in Fort Irwin, California and also
produced a 60 mph wind gust. Storms impacted the morongo basin again
on the afternoon of the 30th. A thunderstorm also impacted Lake
Havasu City, Arizona with wind gusts up to 56 mph and sustained
winds of 43 mph on the afternoon of the 30th. Heavy rain was a
factor in a traffic accident with 1 person reported injured. Damage
was reported to at least two fabric roof coverings and 2 power lines
were downed. A large 18 year old Mesquite tree also knocked over.
Another dust storm impacted Fort Irwin on the 30th reducing
visibility to one-eighth of a mile. Later that evening a
thunderstorm produced winds sustained at 51 mph with a gust of 70
mph at Creech Air Force base in Nevada. The following afternoon a
thunderstorm formed on Mount Charleston, Nevada. Parts of Lee Canyon
saw nearly two inches of rain. Hail up to pea size fell and covered
the ground like snow at the Las Vegas ski and snowboard resort. The
storm flooded a campground and also resulted in parts of Highway 156
being closed.

... Las Vegas...

Records date to 1937 at the official climate station.

* Temperature at McCarran International Airport.

                          Observed departure rank
---------------------------------------------------------------------
avg temperature 90.6 -1.9 40th coolest
avg maximum temperature 101.2 -3.0 7th coolest
avg minimum temperature 80.0 -0.9 16th warmest

Monthly temperature extremes at McCarran

Highest maximum temperature... 109 degrees on the 3rd
lowest maximum temperature... 93 degrees on the 10th and 18th
highest minimum temperature... 91 degrees on the 4th
lowest minimum temperature... 74 degrees on the 10th and 19th

Extremes elsewhere in the Las Vegas Valley during the month...

Location lowest temp/date highest temp/date
---------------------------------------------------------------------
Henderson exec. Airport 72 on 10th & 11th 109 on 3rd
Nellis AFB 69 on 19th 108 on 3rd
North Las Vegas Arpt 71 on 10th 108 on 3rd
North Las Vegas co-op 72 on 26th & 27th 107 on 13th
NWS office 73 on 11th & 19th 111 on 3rd

* precipitation at McCarran International Airport

Monthly total... 0.19 inch
departure from normal... -0.21 inch
number of days with a trace or more... 10
number of days with measurable - 0.01 inch - or more... 3
wettest day... 0.13 inch on the 2nd
number of days with a thunderstorm... 9
total snowfall... 0.0 inch

Totals elsewhere around the Las Vegas Valley for the month were
highest on the west side of the valley from Summerlin centre north
to Lone Mountain as well as in some neighborhoods from the east side
of the lakes toward Rainbow Boulevard between Charleston and
Flamingo. The lowest totals were in the southern sections of North
Las Vegas.

Location total source
---------------------------------------------------------------------
Rainbow & desert inn 1.65 inch ccrfcd
oakey & Jones 1.54 inch cocorahs
Summerlin centre 1.26 inch NWS employee
215 & Cheyenne 1.06 inch ccrfcd
Centennial hills 0.71 inch ccrfcd
Valley View & Sahara 0.68 inch cocorahs
tropicana & Buffalo 0.64 inch cocorahs
tenaya & Washington 0.45 inch cocorahs
downtown Las Vegas 0.39 inch ccrfcd
Summerlin 0.38 inch cocorahs
East Lake Mead Parkway 0.37 inch cocorahs
Flamingo wash at Nellis 0.35 inch ccrfcd
mountain's edge west 0.34 inch NWS employee
Providence 0.33 inch cocorahs
anthem 0.28 inch ccrfcd
Henderson Executive Airport 0.15 inch awss
NWS office 0.15 inch NWS staff
aliante 0.12 inch ccrfcd
equestrian & foothills 0.08 inch ccrfcd
Warm Springs & arville 0.08 inch cocorahs
Nellis AFB 0.02 inch ASOS
Craig & losee trace co-op observer
Green Valley trace spotter
North Las Vegas Airport trace ASOS

* wind at McCarran International Airport

Average wind speed... 10.0 mph
departure from normal... +0.6 mph
highest sustained wind... northwest at 38 mph on the 6th
highest gust... southwest at 52 mph on the 18th

* pressure extremes reduced to sea level

Highest pressure... 30.10 inches on the 19th
lowest pressure... 29.49 inches on the 8th

* notable events during the month:

July 2015 finished with an average temperature of 90.6 degrees.
Based on average temperature, this July ranked as the coolest in Las
Vegas since 2001 when the average temperature was 90.3 degrees.

This was the first time in July since 1993 the high temperature did
not reach or exceed 110 degrees for the month. The other july's in
which the temperature did not reach or exceed 110 degrees were 1955,
1962, 1965, 1976, 1982 and 1986. Normally July sees 5 days of 110
degrees or greater.

There were only 8 days in which the high temperature reached or
exceed 105 degrees for the month which ranks tied with 1965 and 1986
as the 5th lowest total ever for July. The normal number is 16. This
was the lowest total for July since 1999 which had 5 such days, the
least ever for July tied with 1955. Only 1983 with 6 such days and
1976 with 7 such days rank lower.

There were 15 days with a low of 80 degrees or greater during July.
This is the lowest such total for July since 2001 when there were 10
such days. The normal number of days with a low of 80 or greater in
July is 15.

There were a total of 9 days in which thunder was heard at McCarran
International Airport. This ties 1937 and 1950 for the second
highest total ever in July. The normal number of days with thunder
is 3.

A total of 10 days had a trace or more of precipitation. This was
above the normal of 5 but was exceeded last July with 11 such days.
The all-time record for July was 14 days set in 1984.

Precipitation was observed in the Las Vegas Valley on the 1st, 2nd,
4th, 5th, 6th, 7th, 9th, 17th, 18th, 19th, 20th, 29th and 30th.

A strong outflow boundary moved across the far southern parts of the
Las Vegas Valley during the early morning hours of July 1st from
east to west. A few trees were reported down near St. Rose Parkway.
A 61 mph wind gust was measured in Henderson.

A number of trees, especially Palms, were set on fire by lightning
during the early morning hours of July 2nd mainly in Summerlin.

A few streets had minor flooding in the far northwest part of Las
Vegas on the afternoon of July 5th due to locally heavy rain falling.

The most noteworthy storm of the month formed on the evening of July
6th over the eastern foothills of the Spring Mountains and then
moved southeast toward Lone Mountain and northern parts of Summerlin
and eventually toward the center of the valley. This storm had a
very photographic rain shaft associated with it. Hail up to the size
of quarters fell near Lone Mountain with pea size hail falling in
Summerlin north. Around 10 Swiftwater rescues were conducted in the
Las Vegas Valley mainly near Decatur and oakey as well as on koval.
Parts of koval were closed due to flooding. Impressive rain totals
of a half an inch to an inch or more of rain fell in anywhere from
30 minutes to an hour. At least 1700 NV energy customers lost power
and one Palm tree was struck by lightning.

In the early afternoon hours of July 18th, strong outflow moving
north produced wind gusts in excess of 45 mph across much of the
southern and eastern parts of the Las Vegas Valley. A peak wind gust
of 58 mph was clocked at Nellis Air Force base. The high winds
lofted dust that dropped visibility to near zero in some spots
including at the National Weather Service office in Las Vegas.

... Elsewhere across the Mojave Desert and southern Great Basin...

July was below normal across the area with respect to average
temperatures. The largest departures from normal were in the Mojave
Desert.

Location avg. Temp departure rank
                       July 2015 from normal
---------------------------------------------------------------------
Barstow-Daggett 85.8 -3.0 7th coolest
Bishop 76.4 -0.9 27th coolest
Death Valley 99.0 -3.2 12th coolest
Needles 95.0 -1.6 53rd coolest
desert rock 83.0 -1.9 9th coolest
Mt Charleston 63.0 -1.8 7th coolest
Kingman 81.3 -2.3 21st coolest

Temperature extremes across the Las Vegas National Weather Service
area at official weather stations.
---------------------------------------------------------------------
Highest temperature of the month

In California... 119 at Death Valley on the 3rd and 29th
in Nevada... 113 at Overton on the 3rd
in Arizona... 112 at Bullhead City on the 3rd and 27th

Lowest temperature of the month

In California... 49 at Bishop on the 10th
in Nevada... 33 at Spring Valley State Park on the 25th
in Arizona... 46 at Diamond M ranch on the 12th, 25th and 28th

Precipitation amounts were greatest across parts of Lincoln County
and northern Mohave County as well as the Laughlin-Bullhead City
area. Totals in these areas all exceeded one inch for the month. At
Caliente, Nevada a total of 2.64 inches fell which made this the
second wettest July on record dating back to 1903. Only July of 1976
with a total of 2.75 inches ranks wetter. The total of 2.64 inches
at Caliente was also the highest monthly total in the area at an
official weather station. The lowest monthly totals were across
western Inyo County as well as the northern portions of the Las
Vegas Valley into the northern portions of Lake Mead. At an official
weather station the North Las Vegas, NV co-op and Airport reported
the lowest monthly total of a trace with the second lowest total of
0.14 inch measured at Overton, Nevada.

Below are some precipitation totals and departures for a few stations
around the area.

Location monthly departure rank
                        total from normal
---------------------------------------------------------------------
Barstow-Daggett 0.62 inch +0.16 inch 14th wettest
Bishop 0.47 inch +0.31 inch 8th wettest
Death Valley 0.25 inch +0.18 inch 19th wettest
Needles 1.07 inch +0.91 inch 16th wettest
desert rock 1.19 inch +0.73 inch 5th wettest
Mt Charleston 1.90 inch -0.20 inch 17th driest
Kingman 0.92 inch +0.17 inch 43rd wettest

Snow fell above 10,000 feet across parts of the southern Sierra from
the evening of July 9th into the morning of July 9th as a cold area
of low pressure moved across. Although the heaviest snow fell across
parts of Tuolumne and Mono counties, snow was also observed on the
higher mountains around Lake Sabrina where they were left with a
coating of snow confirmed by a photo.

---------------------------------------------------------------------

Note... normals use the period of 1981-2010.

Period of record for stations:
Las Vegas (1937-present) Bishop (1943-present)
Barstow-Daggett (1943-present) Death Valley (1911-present)
Needles (1888-present) desert rock (1977-present)
Mt Charleston (1980-present) Kingman (1901-present)

The above information is preliminary and subject to a final review.
For official certified data... contact the office of noaa's National
centers for environmental information (ncei) located in Asheville,
North Carolina.


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