Eastern Mojave Desert, Including the Mojave National Preserve Severe Watches & Warnings NOAA Weather Radio

Flash Flood Warning
Statement as of 4:21 PM PDT on October 04, 2015

... The Flash Flood Warning remains in effect until 600 PM PDT for
northwestern San Bernardino and southeastern Inyo counties...

At 417 PM PDT... Doppler radar continue to indicate thunderstorms
producing heavy rain near Dantes View and Highway 178 west of

Flash flooding is occurring or expected to begin shortly. Many roads
within Death Valley National Park are closed trapping visitors.

Some locations that will experience flooding include...
Shoshone... furnace creek... sr 127 near Dumont Dunes... Badwater...
Tecopa... Dumont Dunes... Texas Springs campground... Dantes View and
Death Valley Junction.

Precautionary/preparedness actions...

Turn around... dont drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Lat... Lon 3633 11634 3538 11607 3527 11688 3634 11741
      3649 11723 3618 11694 3672 11685


Flood Watch / Flood Statement
Statement as of 4:56 PM PDT on October 04, 2015

... The Flood Advisory will expire at 500 PM PDT for northwestern San
Bernardino and southwestern Inyo counties...

Thunderstorms with heavy rain has diminished across the
area... and flooding is no longer expected to pose a threat.

Additional thunderstorms could develop this evening and overnight.
Monitor media outlets for additional statements.

Lat... Lon 3687 11757 3618 11694 3606 11695 3604 11656
      3472 11600 3482 11753 3511 11763 3579 11763
      3580 11788 3633 11808 3660 11810


Public Information Statement
Statement as of 2:40 PM PDT on October 4, 2015

... A searing September...

Warm weather dominated much of September. This resulted in September
going down as one of the warmest septembers on record in the Mojave
Desert and southern Great Basin. There were two periods that helped
Bolt this month into one of the warmest septembers ever. The first
was from the 7th through the 14th and the second was from the 20th
through the 30th. Just about all locations set their highest reading
of the month on either the 10th, 11th or 12th with this mark set on
the 24th or 25th in a few spots mainly in southern Mohave, far
southern Clark and southeast San Bernardino counties.

Overall, the monsoon was less active this month across the area. The
first push of moisture into the area lasted from the 8th to the 10th
and produced activity mainly in Mohave, Clark and San Bernardino
counties. A few roads flooded in the morongo basin on the 8th and in
northwest San Bernardino County on the 9th. On the 10th, a
thunderstorm triggered a dust storm near Yucca, Arizona that reduced
visibility to near zero.

The next push of moisture lasted from the 13th through the 16th and
was associated with the remnants of Pacific Hurricane Linda. A
trough off the coast of California helped to push the remnants of
Linda northeast across the area. The remnant moisture from Linda
helped to trigger showers and thunderstorms with the most active day
being the 14th. That afternoon, a thunderstorm produced strong
enough winds near Bannock, California to blow 5 railcars off a
track. However, the most significant event was the series of showers
and thunderstorms that moved across the Colorado City-Hildale area
along the Arizona-Utah border. The first round of activity resulted
in flooded roads and cars washing into the creek in Colorado City.
However, a second round of activity unleashed an estimated 2 to 3
inches of rain over the higher terrain north of Hildale which
drained into Short Creek. This created a rapid rise on the creek in
Hildale that roared down the creek into Colorado City sweeping away
debris and two vehicles with it that resulted in 12 deaths. One body
remains missing. This flooding marked the deadliest flash flood ever
in the State of Utah. Another person died later that evening about
15 miles west-southwest Colorado City in Arizona on a back Road when
their vehicle was swept away by floodwaters. The trough associated
with this push of moisture also resulted in light snow falling in
the southern Sierra Nevada above 10,000 feet.

The coolest weather of the month was recorded on the 5th at a few
locations or on the 11th. However, most spots set their lowest
reading of the month between the 17th and 20th. The last push of
moisture resulted in a few showers in eastern Mohave County on the
22nd. Otherwise near record to record breaking warmth closed out the

... Las Vegas...

Records date to 1937 at the official climate station.

* Temperature at McCarran International Airport.

                          Observed departure rank
avg temperature 87.3 +4.7 warmest
avg maximum temperature 98.2 +4.2 11th warmest
avg minimum temperature 76.3 +5.2 warmest

Monthly temperature extremes at McCarran

Highest maximum temperature... 105 on 12th
lowest maximum temperature... 87 on 16th
highest minimum temperature... 82 on 2nd
lowest minimum temperature... 67 on 18th

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

Location lowest temp/date highest temp/date
Henderson exec. Airport 61 on 18th 104 on 12th
Nellis AFB 62 on 18th 105 on 11th
North Las Vegas Arpt 66 on 17th 103 on 10th & 11th
North Las Vegas co-op 65 on 18th 104 on 11th
NWS office 63 on 18th 106 on 10th & 11th

* precipitation at McCarran International Airport

Monthly total... 0.02 inch
departure from normal... -0.23 inch
number of days with a trace or more... 3
number of days with measurable - 0.01 inch - or more... 1
wettest day... 0.01 inch on the 14th and 15th
number of days with a thunderstorm... 2
total snowfall... 0.0 inch

Totals elsewhere around the Las Vegas Valley for the month were
highest in the northeast part of the valley near Nellis Air Force
base. A number of locations on the far north and west sides as well
as in the Green Valley area of Henderson reported no precipitation
at all for the month.

Location total source
Nellis AFB 0.23 inch ASOS
East Lake Mead Parkway 0.19 inch cocorahs
equestrian & foothills 0.08 inch ccrfcd
anthem 0.04 inch ccrfcd
Durango & wigwam 0.04 inch ccrfcd
Sahara & Valley View 0.04 inch cocorahs
oakey & Jones 0.03 inch cocorahs
NWS office 0.03 inch NWS staff
Summerlin centre 0.02 inch NWS employee
tenaya & Washington 0.02 inch cocorahs
tropicana & Buffalo 0.02 inch cocorahs
Providence 0.01 inch cocorahs
Henderson Executive Airport trace awss
North Las Vegas Airport trace ASOS

* wind at McCarran International Airport

Average wind speed... 6.4 mph
departure from normal... -1.9 mph
highest sustained wind... east-northeast at 26 mph
highest gust... 34 mph from the south on the 14th and 15th

* pressure extremes reduced to sea level

Highest pressure... 30.00 inches on the 11th and 24th
lowest pressure... 29.53 inches on the 14th

* notable events during the month:

In Las Vegas, the average temperature for the month was 87.3 degrees
at the official climate station at McCarran International Airport.
This broke the previous record for the warmest September ever of
86.2 degrees set in 2009. The normal average temperature for
September is 82.6 degrees.

There were also a total of 9 days with a low of 80 degrees or
greater. This broke the previous record of 7 such days set in 2012.
The normal number of such days for September is 1. To no
surprise... the average monthly low for this September was 76.3
degrees. The previous record was 75.1 degrees set in 2009. The
normal average minimum temperature for September is 71.1

A total of 15 days had a high in the triple digits during the month.
The normal for the month is 6 days. This is the highest total for
September since 1979 when there were 18 such days. There was also a
record latest in the season ever 7 consecutive days at or above 100
degrees from the 24th through the 30th. The previous record for the
latest stretch of 7 days in a row at or above 100 was from September
23-29, 1947.

Precipitation was reported in the Las Vegas Valley on the 8th, 13th,
14th and 15th.

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

This was one of the warmest septembers on record across the area at
all of the major climate stations.

Location avg. Temp departure rank
                    September 2015 from normal
Barstow-Daggett 83.5 +3.4 9th warmest
Bishop 71.0 +3.4 2nd warmest
Death Valley 93.6 +2.6 15th warmest
Needles 92.5 +5.1 warmest
desert rock 79.3 +4.2 2nd warmest
Mt Charleston 61.3 +4.1 2nd warmest
Kingman 79.1 +3.5 2nd warmest

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

In California... 118 at Death Valley on the 11th
in Nevada... 110 at Mesquite and Overton on the 11th
in Arizona... 111 at Bullhead City on the 8th and 24th

Lowest temperature of the month

In California... 40 at Bishop on the 5th
in Nevada... 27 at Spring Valley State Park on the 21st
in Arizona... 42 at Pipe Spring National Monument on the 11th and at
Diamond M ranch on the 18th

Overall most areas saw a drop in the amount of precipitation during
September due to the reduction in monsoon-related shower and
thunderstorm activity. A large number of locations saw no
precipitation at all for the month. No precipitation was reported in
Arizona at Bullhead City, in California at furnace creek in Death
Valley, Iron Mountain, Parker Reservoir, scotty's Castle and Trona
as well as in Nevada at desert rock, Hiko, Laughlin and Spring
Mountain ranch. The highest total at an official weather station was
1.80 inch at Pipe Spring National Monument, Arizona. Amounts
elsewhere were mainly under a quarter of an inch except in the
higher portions of Mount Charleston, Nevada which exceeded an inch
for the month, the morongo basin of California where amounts ranged
between three-tenths and eight-tenths of an inch and the Wikieup,
Arizona area where amounts where around seven-tenths of an inch.

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

Location monthly departure rank
                        total from normal
Barstow-Daggett 0.17 inch -0.04 inch 49th driest
Bishop 0.01 inch -0.18 inch 28th driest
Death Valley 0.00 inch -0.21 inch driest
Needles trace -0.43 inch 22nd driest
desert rock 0.00 inch -0.60 inch driest
Mt Charleston 1.68 inch +0.24 inch 14th wettest
Kingman 0.20 inch -0.82 inch 28th driest

Snow was reported in the southern Sierra Nevada above Lake Sabrina
on September 15th.


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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