Public Information Statement
Issued by NWS Las Vegas, NV

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2
000
NOUS45 KVEF 090638
PNSVEF
AZZ001>003-036-CAZ519>527-NVZ014>022-091845-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1138 PM PDT WED OCT 8 2014 /1138 PM MST WED OCT 8 2014/

...A TASTE OF THE TROPICS YIELDS A WET SEPTEMBER FOR MANY...

SEPTEMBER 2014 WILL GO DOWN AS ONE OF THE MOST ACTIVE YEARS IN THE
MOJAVE DESERT AND SOUTHERN GREAT BASIN FOR THUNDERSTORMS ASSOCIATED
WITH INFLUXES OF MOISTURE FROM REMNANT TROPICAL SYSTEMS. FOUR
SIGNIFICANT EVENTS ALL TOOK PLACE DURING THE MONTH WITH A TROPICAL
OR SUB-TROPICAL CONNECTION, WHICH LIKELY MAKES THIS THE MOST ACTIVE
PATTERN OF THIS TYPE IN THIS PART OF THE COUNTRY SINCE SEPTEMBER
1939.

THERE WERE TWO MAIN STRETCHES OF HOT AND DRY WEATHER DURING THE
MONTH. THE FIRST WAS FROM THE 1ST THROUGH THE 6TH AND THE SECOND WAS
FROM THE 11TH THROUGH THE 16TH. THE HOTTEST TEMPERATURES OF THE
MONTH WERE SET ON THE 1ST OR 2ND IN MOST LOCATIONS, THOUGH A FEW
SPOTS, SUCH AS DEATH VALLEY, REACHED THESE ON THE 15TH AND 16TH.

THE FIRST, AND MOST SIGNIFICANT, OF THE TWO TRUE TROPICAL MOISTURE
INFLUXES TOOK PLACE FROM SEPTEMBER 7TH THROUGH 9TH WHEN MOISTURE
ASSOCIATED WITH HURRICANE NORBERT PUSHED INTO THE AREA. THE MOST
SIGNIFICANT IMPACTS WERE ACROSS CLARK, LINCOLN, MOHAVE AND EASTERN
SAN BERNARDINO COUNTIES.

THE MOST NOTABLE EVENT OF THE 2014 MONSOON SEASON TOOK PLACE ON THE
AFTERNOON OF SEPTEMBER 8TH, WHEN A SERIES OF THUNDERSTORMS TRACKED
OVER THE MUDDY RIVER BASIN AND EVENTUALLY THE TOWN OF MOAPA, NEVADA.
HEAVY RAIN IN EXCESS OF TWO INCHES FELL IN THE HEADWATERS OF THE
MUDDY RIVER. THIS WOULD HAVE BEEN ENOUGH TO CAUSE ISSUES, HOWEVER,
EVEN HEAVIER RAIN FELL JUST NORTHEAST OF MOAPA IN THE WEISER WASH,
WHICH REPORTED A STORM TOTAL OF 4.72 INCHES, MOST OF WHICH FELL IN
JUST 2 HOURS. THIS IS NEARLY A 1000 YEAR STORM FOR THIS AREA, AS
THIS IS VIRTUALLY THE NORMAL ANNUAL PRECIPITATION. THE LARGE VOLUME
OF WATER IN THE WEISER WASH RAN DOWN THE WASH AND ONTO INTERSTATE 15
OVERWHELMING THE HIGHWAY AND FLOATING VEHICLES AWAY ALONG WITH LARGE
CHUNKS OF THE PAVEMENT. ONE PERSON WAS INJURED WHEN HE TRIED TO
RESCUE A PERSON FROM A VEHICLE. THIS WATER EVENTUALLY DRAINED INTO
THE MUDDY RIVER WHICH FLOATED DOWNSTREAM TOWARD LOGANDALE AND
OVERTON. THE MUDDY RIVER CRESTED AT GLENDALE AT LEAST AT 9 FEET. THE
CATASTROPHIC FLOODING PROMPTED A STATE OF EMERGENCY TO BE DECLARED
BY THE GOVERNOR OF NEVADA. DAMAGE ESTIMATES WERE PLACED AT LEAST AT
5 MILLION DOLLARS. BESIDES THE DAMAGE TO INTERSTATE 15, WHICH CLOSED
FOR DAYS, HIGHWAY 93 WAS ALSO FLOODED AND CLOSED BETWEEN APEX AND
COYOTE SPRINGS. IN ADDITION, RAILROAD TRACKS WERE WASHED OUT NEAR
MOAPA AND NEAR CALIENTE. THIS CRIPPLED TRANSPORTATION BETWEEN LAS
VEGAS AND UTAH SHUTTING OFF ACCESS FOR HOURS. EVEN ONCE HIGHWAY 93
WAS RE-OPENED, MASSIVE DELAYS TOOK PLACE AS TRAFFIC WAS RE-ROUTED
THROUGH LINCOLN COUNTY. FOUR EARTHEN DAMS IN AND AROUND MOAPA ALSO
FAILED AND THE POWER GRID FOR THE MOAPA AND MESQUITE AREAS ALSO TOOK
A HIT FROM FLOODING. A TOTAL OF 91 HOMES IN MOAPA AND 48 HOMES IN
OVERTON AND LOGANDALE WERE FLOODED, LARGELY BY THE MUDDY RIVER.
ADDITIONALLY, HEAVY RAIN FELL IN AND AROUND THE VIRGIN RIVER GORGE
IN ARIZONA WHICH TRIGGERED WATERFALLS TO FORM IN THE GORGE.

SANDY VALLEY, NEVADA WAS ALSO HARD HIT THAT SAME DAY BY A SEPARATE
THUNDERSTORM THAT TOOK OUT NEARLY HALF OF THE DIRT ROADS IN THE
COMMUNITY. DAMAGES TOTALED AT LEAST 427,000 DOLLARS. A TOTAL OF 2.60
INCHES OF RAIN WAS MEASURED HERE BY A SPOTTER.

BY MID-MONTH, THE TROPICS RELOADED AND MOISTURE FROM HURRICANE
ODILLE PUSHED INTO THE AREA. THIS EVENT IMPACTED MOHAVE AND
SOUTHEAST AND SOUTH-CENTRAL SAN BERNARDINO COUNTIES ON SEPTEMBER
16TH. ONE PERSON WAS KILLED IN JOSHUA TREE, CALIFORNIA AFTER HIS SUV
WAS SWEPT OFF A ROAD BY FLOODWATERS TRYING TO CROSS A WASH.
FLOODWATERS ALSO ENTERED A HOME IN JOSHUA TREE SWEEPING AWAY A 17
MONTH OLD BOY WHO SUFFERED MINOR INJURIES. HAIL UP TO ONE INCH IN
DIAMETER FELL IN JOSHUA TREE AND NEAR DOLAN SPRINGS, ARIZONA.
SEVERAL ROADS WERE FLOODED AND CLOSED THROUGHOUT THESE TWO COUNTIES
FROM THIS EVENT.

THUNDERSTORMS ON THE 20TH AND 21ST DEVELOPED AS ANOTHER SYSTEM MOVED
ACROSS THE AREA AND TAPPED INTO SUB-TROPICAL MOISTURE. LIGHTNING
STRUCK A HISTORIC BUILDING IN THE GHOST TOWN OF RHYOLITE, NEVADA AND
SET IT FIRE ON THE 20TH. THE FOLLOWING DAY, HAIL UP TO ONE INCH IN
DIAMETER FELL AT THE PIPE SPRING NATIONAL MONUMENT IN ARIZONA FROM A
THUNDERSTORM.

THE FINAL EVENT OF THE MONTH TOOK PLACE FROM THE 26TH THROUGH THE
27TH, WHEN THE FIRST COLD SEASON STORM FROM THE PACIFIC MOVED IN.
THIS SYSTEM TAPPED A FETCH OF SUB-TROPICAL MOISTURE TRIGGERING HEAVY
RAIN PRODUCING THUNDERSTORMS ACROSS CLARK, MOHAVE AND EASTERN SAN
BERNARDINO COUNTIES. HARDEST-HIT AGAIN WERE THE MOAPA AND OVERTON
AREAS WHICH ONCE AGAIN FLOODED DUE TO A RISE OF THE MUDDY RIVER,
WHICH CRESTED AT OVER 12 FEET. THIS CAUSED ROADS IN THE MOAPA AREA
TO FLOOD AND BE CLOSED. TWO SWIFTWATER RESCUES WERE CONDUCTED IN
GOLDEN VALLEY, ARIZONA.

...LAS VEGAS...

RECORDS DATE TO 1937 AT THE OFFICIAL CLIMATE STATION.

* TEMPERATURE AT MCCARRAN INTERNATIONAL AIRPORT

                         OBSERVED     DEPARTURE    RANK
--------------------------------------------------------------------
AVG TEMPERATURE          85.4         +2.8         TIED 2ND WARMEST
AVG MAX TEMP             96.4         +2.4         TIED 25TH WARMEST
AVG MIN TEMP             74.4         +3.3         2ND WARMEST

MONTHLY TEMPERATURE EXTREMES AT MCCARRAN

HIGHEST MAXIMUM TEMPERATURE...106 ON THE 2ND
LOWEST MAXIMUM TEMPERATURE...79 ON THE 28TH
HIGHEST MINIMUM TEMPERATURE...80 ON THE 5TH AND THE 16TH
LOWEST MINIMUM TEMPERATURE...60 ON THE 28TH

EXTREMES ELSEWHERE IN THE LAS VEGAS VALLEY DURING THE MONTH...

LOCATION               LOWEST TEMP/DATE       HIGHEST TEMP/DATE
--------------------------------------------------------------------
HENDERSON EXEC. ARPT   57 ON 28TH             106 ON 2ND
NELLIS AFB             58 ON 28TH             104 ON 2ND
NORTH LAS VEGAS ARPT   59 ON 28TH             105 ON 2ND
NORTH LAS VEGAS CO-OP  59 ON 28TH             105 ON 1ST
NWS OFFICE             58 ON 28TH             108 ON 2ND

* PRECIPITATION AT MCCARRAN INTERNATIONAL AIRPORT

MONTHLY TOTAL...0.64 INCH
DEPARTURE FROM NORMAL...+0.39 INCH
NUMBER OF DAYS WITH A TRACE OR MORE...7
NUMBER OF DAYS WITH MEASURABLE - 0.01 INCH - OR MORE...5
WETTEST DAY...0.32 INCH ON THE 26TH
NUMBER OF DAYS WITH A THUNDERSTORM...5
TOTAL SNOWFALL...0.0 INCH

PRECIPITATION TOTALS WERE GREATEST IN THE SOUTHWEST PART OF THE LAS
VEGAS VALLEY MAINLY FROM THE MESAS AREA OF SUMMERLIN SOUTH EAST
TOWARD THE SPANISH TRAIL NEIGHBORHOOD AREA WHERE MOST LOCATIONS SAW
OVER 2 INCHES OF RAIN FOR THE MONTH. IRONICALLY ONE OF THE NORMALLY
WETTER PARTS OF THE VALLEY WAS THE DRIEST PART OF THE VALLEY DURING
SEPTEMBER. TOTALS IN THE ANTHEM AND SEVEN HILLS AREAS OF HENDERSON
WERE UNDER A TENTH OF AN INCH IN MANY SPOTS.

LOCATION                         TOTAL            SOURCE
---------------------------------------------------------------------
TROPICANA & BUFFALO              2.71 INCHES      COCORAHS
FT APACHE & PEACE                2.44 INCHES      CCRFCD
SUMMERLIN/THE MESAS              2.13 INCHES      CCRFCD
SUMMERLIN CENTRE                 1.87 INCH        NWS EMPLOYEE
SAHARA & VALLEY VIEW             1.35 INCH        COCORAHS
SUMMERLIN                        1.28 INCH        COCORAHS
TENAYA & WASHINGTON              1.12 INCH        COCORAHS
CENTENNIAL HILLS                 1.06 INCH        CCRFCD
OAKEY & JONES                    0.96 INCH        COCORAHS
PROVIDENCE                       0.95 INCH        COCORAHS
EASTERN & TWAIN                  0.94 INCH        CCRFCD
ALIANTE                          0.87 INCH        CCRFCD
NELLIS AFB                       0.84 INCH        ASOS
CRAIG & LOSEE                    0.82 INCH        CO-OP OBSERVER
NWS OFFICE                       0.66 INCH        NWS STAFF
DOWNTOWN LAS VEGAS               0.51 INCH        CCRFCD
EAST LAKE MEAD PARKWAY           0.50 INCH        COCORAHS
NORTH LAS VEGAS AIRPORT          0.42 INCH        ASOS
ROBINDALE & PECOS                0.39 INCH        COCORAHS
GREENWAY & HEATHER               0.37 INCH        COCORAHS
CACTUS & DURANGO                 0.31 INCH        CCRFCD
LAKE LAS VEGAS                   0.31 INCH        CCRFCD
ANTHEM                           0.20 INCH        CCRFCD
WARM SPRINGS & ARVILLE           0.15 INCH        COCORAHS
HENDERSON EXECUTIVE AIRPORT      0.09 INCH        AWSS
ANTHEM PARKWAY & REUNION         0.04 INCH        CCRFCD

* WIND AT MCCARRAN INTERNATIONAL AIRPORT

AVERAGE WIND SPEED...8.6 MPH
DEPARTURE FROM NORMAL...+0.3 MPH
HIGHEST SUSTAINED WIND...SOUTH AT 32 MPH ON THE 7TH
HIGHEST GUST...SOUTH AT 44 MPH ON THE 7TH

* PRESSURE EXTREMES REDUCED TO SEA LEVEL

HIGHEST PRESSURE...29.95 INCHES ON THE 22ND
LOWEST PRESSURE...29.54 INCHES ON THE 4TH

* NOTABLE EVENTS DURING THE MONTH:

THERE WERE 11 DAYS DURING THE MONTH OF SEPTEMBER WITH A HIGH IN THE
TRIPLE DIGITS. THE NORMAL NUMBER OF SUCH DAYS IS 6 FOR THE MONTH.
THE YEARLY TOTAL WAS 80 SUCH DAYS, WHICH WAS 10 ABOVE NORMAL. THE
LAST DAY WITH A HIGH IN THE TRIPLE DIGITS WAS 100 DEGREES ON THE
25TH. THE AVERAGE LAST DATE WITH A TRIPLE DIGIT HIGH IS SEPTEMBER
16TH.

SEVERAL DAYS FEATURED NOTABLE THUNDERSTORM ACTIVITY IN THE LAS
VEGAS VALLEY DURING THE MONTH. EARLY ON THE AFTERNOON OF SEPTEMBER
7TH, HAIL UP TO NICKLE SIZE FELL IN SUMMERLIN IN THE AREA NEAR 215
AND CHARLESTON. LATER THAT AFTERNOON, ANOTHER THUNDERSTORM UNLEASHED
HEAVY RAIN ON THE WEST ENDS OF TROPICANA AND FLAMINGO WHICH RESULTED
IN LARGE AMOUNTS OF MUD AND ROCKS WASHING ONTO TROPICANA AND A
VEHICLE GETTING STUCK IN SEVERAL INCHES OF WATER ON THE 215 EXIT AT
FLAMINGO.

THE FOLLOWING DAY, ON SEPTEMBER 8TH, THUNDERSTORMS ONCE AGAIN
SLAMMED THE SOUTHWEST PART OF THE LAS VEGAS VALLEY. STORMS WASHED
LARGE AMOUNTS OF MUD AND ROCKS ONTO THE WEST END OF TROPICANA.
NUMEROUS OTHER STREETS IN THE SOUTHWEST NEAR TROPICANA HAD FLASH
FLOODING. AT LEAST 3 SWIFTWATER RESCUES TOOK PLACE. HEAVY RAIN ALSO
CAUSED RAPID FLOWS IN THE FLAMINGO WASH WHICH RUSHED THROUGH THE
PARKING GARAGE OF THE LINQ ON THE STRIP SWEEPING A CONSTRUCTION
WORKER OFF HIS FEET. HE WAS UNINJURED. ABOUT 3,000 PEOPLE LOST POWER
IN THE FAR NORTHWEST PART OF LAS VEGAS.

THUNDERSTORMS ON THE EVENING OF SEPTEMBER 26TH ALSO RESULTED IN
SEVERAL SIGNIFICANT IMPACTS IN THE LAS VEGAS VALLEY. A 63 MPH WIND
GUST WAS CLOCKED AT THE NORTH LAS VEGAS AIRPORT WHICH TOOK DOWN TREE
LIMBS AND BLEW IN A DOOR AT A NEARBY BUSINESS. ONE CARPORT WAS ALSO
KNOCKED DOWN AT AN APARTMENT COMPLEX BY STRONG THUNDERSTORM WINDS.
HAIL FROM DIME TO PENNY SIZE FELL NEAR CHARLESTON AND FORT APACHE.
DECATUR BOULEVARD WAS FLOODED AND IMPASSIBLE NEAR HORSE DRIVE.

...ELSEWHERE ACROSS THE MOJAVE DESERT AND SOUTHERN GREAT BASIN...

SEPTEMBER 2014 AVERAGED ABOVE TO WELL ABOVE NORMAL AT THE MAJOR
CLIMATE STATIONS IN THE MOJAVE DESERT AND SOUTHERN GREAT BASIN.

LOCATION               AVG. TEMP         DEPARTURE       MONTHLY
                    SEPTEMBER 2014      FROM NORMAL        RANK
--------------------------------------------------------------------
BISHOP                   71.3              +3.7          WARMEST
BARSTOW-DAGGETT          83.3              +3.2       10TH WARMEST
DEATH VALLEY             94.2              +3.2        8TH WARMEST
NEEDLES                  89.8              +2.4       10TH WARMEST
DESERT ROCK              77.5              +2.3        8TH WARMEST
MT CHARLESTON            62.3              +5.1          WARMEST
KINGMAN                  75.9              +0.3       31ST WARMEST

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 15TH AND 16TH
IN NEVADA...109 AT LAUGHLIN ON THE 2ND
IN ARIZONA...112 AT LAKE HAVASU CITY ON THE 1ST

LOWEST TEMPERATURE OF THE MONTH

IN CALIFORNIA...38 AT BISHOP ON THE 29TH
IN NEVADA...31 AT SPRING VALLEY STATE PARK ON THE 29TH
IN ARIZONA...37 AT DIAMOND M RANCH ON THE 30TH

PRECIPITATION ACROSS THE AREA WERE HIGHEST ACROSS MOHAVE, CLARK AND
LINCOLN COUNTIES WHERE MANY LOCATIONS REPORTED TOTALS IN EXCESS OF
TWO INCHES FOR THE MONTH. THE WETTEST TOTAL AT AN OFFICIAL WEATHER
STATION WAS 2.67 INCHES AT MESQUITE, NEVADA. THE DRIEST PORTION OF
THE AREA WAS ACROSS WESTERN INYO AS WELL AS NORTHWESTERN AND CENTRAL
SAN BERNARDINO COUNTY WHERE MANY LOCATIONS RECEIVED UNDER A QUARTER
OF AN INCH OF PRECIPITATION FOR THE MONTH. WONDER VALLEY SOUTH,
CALIFORNIA REPORTED THE LOWEST MONTHLY TOTAL OF ALL OFFICIAL WEATHER
STATIONS WITH A TRACE.

LOCATION             MONTHLY            DEPARTURE        MONTHLY
                      TOTAL            FROM NORMAL         RANK
--------------------------------------------------------------------
BISHOP              0.16 INCH          -0.03 INCH      48TH DRIEST
BARSTOW-DAGGETT       TRACE            -0.21 INCH      17TH DRIEST
DEATH VALLEY +      0.76 INCH          +0.55 INCH      6TH WETTEST
NEEDLES             0.87 INCH          +0.44 INCH      17TH WETTEST
DESERT ROCK         0.34 INCH          -0.26 INCH      24TH DRIEST
MT CHARLESTON +     1.11 INCH          -0.33 INCH      20TH DRIEST
KINGMAN            2.40 INCHES         +1.38 INCH      8TH WETTEST

+ CALCULATED USING OBSERVATIONAL DAY PRECIPITATION...WHICH IS TAKEN
AT ABOUT 8 AM EACH DAY...THUS TOTALS MAY NOT BE ENTIRELY FROM THE
MONTH.

WITH ENOUGH COLD AIR ASSOCIATED WITH STORMS, SNOW FELL IN THE
HIGHEST ELEVATIONS OF THE AREA DURING THE MONTH. A COATING OF SNOW
WAS OBSERVED ABOVE 11,000 FEET IN THE EASTERN SLOPES OF THE SOUTHERN
SIERRA NEVADA NEAR LAKE SABRINA, CALIFORNIA ON THE MORNING OF THE
21ST. ANOTHER ROUND OF SNOW TOOK PLACE IN THE HIGHER ELEVATIONS OF
THE EASTERN SLOPES OF THE SOUTHERN SIERRA NEVADA ON THE 28TH WITH
SNOW FLURRIES REPORTED AT LAKE SABRINA AT 9200 FEET. ON THE MORNING
OF THE 29TH, SNOW COVERED THE SUMMIT OF MT CHARLESTON, NEVADA FOR
THE FIRST TIME THIS SEASON FALLING AS LOW AS 9,000 FEET.
---------------------------------------------------------------------

NOTE...NORMALS ABOVE USE THE 1981-2010 PERIOD.

PERIOD OF RECORD FOR LOCATIONS:
LAS VEGAS (1937-PRESENT)             BISHOP (1943-PRESENT)
BARSTOW-DAGGETT (1943-PRESENT)       DEATH VALLEY (1911-PRESENT)
NEEDLES (1888-PRESENT)               DESERT ROCK (1978-PRESENT)
MT CHARLESTON (1980-PRESENT)         KINGMAN (1901-PRESENT)

THE ABOVE INFORMATION IS PRELIMINARY AND IS SUBJECT TO A FINAL
REVIEW BEFORE BEING CERTIFIED BY THE NATIONAL CLIMATIC DATA CENTER.

$$

STACHELSKI





USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.