Climatological Report (Monthly)
Issued by NWS Spokane, WA

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CXUS56 KOTX 011013
CLMGEG


CLIMATE REPORT
NATIONAL WEATHER SERVICE SPOKANE, WA
238 AM PDT TUE OCT 1 2013

SEPTEMBER 2013 BROUGHT UNUSUALLY WET CONDITIONS TO NORTHEAST
WASHINGTON AND THE NORTH IDAHO PANHANDLE.  BONNERS FERRY HAD THE
WETTEST SEPTEMBER ON RECORD.  THE FIRST HALF OF THE MONTH WAS A
CONTINUATION OF THE SUMMER WEATHER FROM AUGUST WITH WARM AND HUMID
CONDITIONS.  THE LAST HALF OF THE MONTH WAS ANOTHER STORY AS A
SERIES OF LOW PRESSURE SYSTEMS FROM THE GULF OF ALASKA BROUGHT MUCH
COOLER TEMPERATURES AND PERIODS OF WET WEATHER.  THE WARM AND HUMID
AIR MASS FOR THE FIRST HALF OF THE MONTH CONTRIBUTED TO A COUPLE
DAYS OF THUNDERSTORMS ON THE 5TH AND AGAIN ON THE 15TH.  ON THE 5TH
THUNDERSTORMS TRACKED UP FROM LA CROSSE UP THROUGH AIRWAY HEIGHTS
WITH ABUNDANT LIGHTNING DURING THE MORNING HOURS.  SOME STORMS
PRODUCED BRIEF HEAVY RAINFALL DUE TO TRAINING OF STORMS IN THE SAME
AREA WITH A SMALL MUDSLIDE OCCURRING ALONG HIGHWAY 291 AND SCOTTS
VALLEY ROAD.  ABUNDANT LIGHTNING WAS ALSO PRESENT IN THE UPPER
COLUMBIA BASIN AND OKANOGAN HIGHLANDS.  ON THE 15TH A LINE OF
THUNDERSTORMS TRACKED OUT OF THE LOWER COLUMBIA BASIN AND TRACKED
NORTH TO THE CANADIAN BORDER.  STRONG OUTFLOW WINDS RESULTING IN
WIDESPREAD STRONG WINDS ALONG WITH A WALL OF DUST THAT BRIEFLY
LOWERED VISIBILITIES TO A QUARTER MILE OR LESS.  THE LAST HALF OF
THE MONTH BROUGHT AN EARLY START TO THE WET SEASON AS A SERIES OF
LOW PRESSURE SYSTEMS BROUGHT COOL AND WET WEATHER.  THE STRONGEST
STORMS PASS THROUGH ON THE 28TH AND 29TH.  VERY WET AND WINDY
WEATHER WAS VERY IMPRESSIVE BY SEPTEMBER STANDARDS...WITH 3-6 INCHES
OF RAIN IN THE MOUNTAINS AND 1-3 INCHES IN THE VALLEYS.  THE HIGHER
MOUNTAIN PEAKS ALSO RECEIVED A DUSTING OF SNOW.  WINDS GUSTED AS
HIGH AS 40 TO 50 MPH.

A COUPLE RECORDS WERE SET DURING THE MONTH AT SPOKANE INTERNATIONAL
AIRPORT.  ON THE 12TH THE HIGH TEMPERATURE REACHED 91 TYING A
RECORD HIGH FOR THE DATE.  ON THE 13TH THE HIGH TEMPERATURE REACHED
RECORD 92 SETTING A RECORD FOR THE DATE.

.......................................................

...THE SPOKANE WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2013...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1881 TO 2013

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              98   09/18/1938
 LOW               22   09/23/2000
                        09/24/1926
HIGHEST            92   09/13        MM      MM       86  09/20
                        09/01                             09/08
LOWEST             42   09/27        MM      MM       35  09/11
                        09/26
                        09/25
AVG. MAXIMUM     73.5              72.9     0.6     77.7
AVG. MINIMUM     52.6              47.4     5.2     49.1
MEAN             63.0              60.2     2.8     63.4
DAYS MAX >= 90      6               1.2     4.8        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.6    -0.6        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.58   1927
 MINIMUM            T   2012
                        1999
TOTALS           1.56              0.67    0.89        T
DAILY AVG.       0.05              0.02    0.03        T
DAYS >= .01        14               5.1     8.9        0
DAYS >= .10         4               2.1     1.9        0
DAYS >= .50         1               0.2     0.8        0
DAYS >= 1.00        0               0.0     0.0        0
GREATEST
 24 HR. TOTAL    0.73   09/28 TO 09/29               09/23
                                                     09/30

SNOWFALL (INCHES)
RECORDS
 TOTAL            1.4   1926
TOTALS            0.0               0.0     0.0      0.0
SINCE 7/1         0.0               0.0     0.0      0.0
SNOWDEPTH AVG.      0                                  0
DAYS >= 1.0         0               0.0     0.0        0
GREATEST
 SNOW DEPTH         0                                  0
 24 HR TOTAL      0.0   09/30                        09/30

DEGREE_DAYS
HEATING TOTAL     160               183     -23       68
 SINCE 7/1        167               248     -81      102
COOLING TOTAL     108                38      70       27
 SINCE 1/1        709               449     260      535
.................................................

WIND (MPH)
AVERAGE WIND SPEED              8.6
HIGHEST WIND SPEED/DIRECTION    43/250    DATE  09/15
HIGHEST GUST SPEED/DIRECTION    53/250    DATE  09/15

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            6
NUMBER OF DAYS PC             13
NUMBER OF DAYS CLOUDY         11

AVERAGE RH (PERCENT)     60

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       4
LIGHT RAIN               17     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      12     FOG W/VIS <= 1/4 MILE      1
HAZE                      2

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

$$




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