Climatological Report (Monthly)
Issued by NWS Annette, AK

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000
CXAK57 PAJK 011346
CLMANN
CLIMATE REPORT
NATIONAL WEATHER SERVICE JUNEAU, AK
545 AM AKDT WED NOV 1 2017

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

...THE ANNETTE ISLAND CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1941 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
RECORD
 HIGH              71   MM
 LOW               18   12/31/1999
HIGHEST            63   10/02        MM      MM
LOWEST             34   10/30        MM      MM
                        10/26
AVG. MAXIMUM     53.0              51.6     1.4
AVG. MINIMUM     41.1              41.9    -0.8
MEAN             47.1              46.7     0.4
DAYS MAX >= 90      0               0.0     0.0
DAYS MAX <= 32      0               0.1    -0.1
DAYS MIN <= 32      0               1.4    -1.4
DAYS MIN <= 0       0               0.0     0.0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        34.87   1958
 MINIMUM         4.59   2016
TOTALS          10.16             13.92   -3.76
DAILY AVG.       0.34              0.45   -0.11
DAYS >= .01        19              23.6    -4.6
DAYS >= .10        16              19.0    -3.0
DAYS >= .50         6               9.8    -3.8
DAYS >= 1.00        3               4.6    -1.6
GREATEST
 24 HR. TOTAL    1.68   10/18 TO 10/18

SNOWFALL (INCHES)
RECORDS
 TOTAL            4.2   1956
 24 HR TOTAL      2.4   10/30/1956 TO 10/30/1956
 SNOW DEPTH         2   10/28/1985
TOTALS            0.0               0.1    -0.1
SINCE 7/1         0.0               0.1    -0.1
SNOWDEPTH AVG.      0                 0       0
DAYS >= TRACE       0               0.1    -0.1
DAYS >= 1.0         0               0.0     0.0        0
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL      0.0   10/31 TO 10/31

DEGREE_DAYS
HEATING TOTAL     476               558     -82
 SINCE 7/1       1073              1294    -221
COOLING TOTAL       0                 0       0
 SINCE 1/1         44                17      27

FREEZE DATES
EARLIEST                        10/29
LATEST                          04/12
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              6.4
HIGHEST WIND SPEED/DIRECTION    32/160    DATE  10/06
HIGHEST GUST SPEED/DIRECTION    51/120    DATE  10/18


WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                9     RAIN                      11
LIGHT RAIN               18     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                2     SLEET                      0
FOG                      12     FOG W/VIS <= 1/4 MILE      0
HAZE                      1

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

$$
...Below normal precipitation for October in spite of an
atmospheric river event for southeast Alaska...

The most impactful event of October 2017 came late in the month when
an Atmospheric River produced record rainfall in many locations.
Most notable was the record flooding on Jordan Creek near Juneau.
Flood waters there covered Old Glacier Highway with 6 or more inches
of running water. The crest of 10.97 feet late in the day of the
27th of October was the highest recorded since the Jordan was
gauged. 48 hour rainfall totals of 3 or more inches were recorded at
29 sites with Powder Patch at the Eaglecrest ski area receiving 7.94
inches. In spite of this very impressive rain event, few locations
across the Panhandle recorded above normal precipitation for the
month. Those that did include the greater Juneau area, Gustavus,
Pelican, and Hoonah.

Temperatures for October trended around normal with a few excursions
above normal, and a few more below normal. Temperatures fell below
freezing at least 7 times in Juneau and 8 times in Yakutat. The
first freeze of the season has yet to arrive in Annette or Sitka. A
tenth of an inch of snow was recorded at Yakutat on the 20th of the
month.

$$



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