Climatological Report (Monthly)
Issued by NWS

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928
CXAK57 PAJK 022215
CLMASI
CLIMATE REPORT
NATIONAL WEATHER SERVICE JUNEAU, AK
150 PM AKDT SUN SEP 2 2018

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

...THE SITKA CLIMATE SUMMARY FOR THE MONTH OF AUGUST 2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1944 TO 2018

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              84   08/18/1950
 LOW               34   08/15/1945
HIGHEST            73   08/04        72       1
LOWEST             51   08/26        47       4
                        08/19
                        08/18
AVG. MAXIMUM     62.7              61.9     0.8
AVG. MINIMUM     54.1              52.5     1.6
MEAN             58.4              57.2     1.2
DAYS MAX >= 90      0               0.0     0.0
DAYS MAX <= 32      0               0.0     0.0
DAYS MIN <= 32      0               0.0     0.0
DAYS MIN <= 0       0               0.0     0.0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        19.51   1961
 MINIMUM         1.72   1977
TOTALS           9.00              6.87    2.13
DAILY AVG.       0.29              0.22    0.07
DAYS >= .01        19              19.2    -0.2
DAYS >= .10        13              12.7     0.3
DAYS >= .50         5               4.8     0.2
DAYS >= 1.00        3               1.6     1.4
GREATEST
 24 HR. TOTAL    2.62   08/08 TO 08/08

DEGREE_DAYS
HEATING TOTAL     201               243     -42
 SINCE 7/1        404               516    -112
COOLING TOTAL       0                 1      -1
 SINCE 1/1          0                 1      -1

FREEZE DATES
EARLIEST                        11/04
LATEST                          04/13
.................................................

WIND (MPH)
AVERAGE WIND SPEED              6.1
HIGHEST WIND SPEED/DIRECTION    23/310    DATE  08/31
HIGHEST GUST SPEED/DIRECTION    32/270    DATE  08/31


WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                5     RAIN                      12
LIGHT RAIN               24     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      21     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.

$$
...Widely varying precipitation totals across Southeast Alaska for
August 2018...

The month started out with return of a more moist pattern and a
shift away from the heat and dry weather of July. Rain was mostly
confined to more northerly locations for the first two weeks of the
month. In general, the average pattern consisted of a low over the
eastern Gulf with a ridge of high pressure encroaching from the
Yukon. Heavy rain fell during the second week of the month as a
result of two separate atmospheric river events and some daily
records were set. Yakutat set a record daily maximum rainfall of
4.25" on August 7th, breaking a 50-year-old record set back in 1963,
and again on August 13th with 3.33", breaking the previous record
from 1961. Sitka airport recorded record rainfall late in the month
with 1.33 inches on the 28th of August. Many Coop precipitation
records broken as well on August 8th and 9th, including Pelican 2-
day total of 8.95".

During the first event, flood warnings were issued for the Taiya
River (crested at 18.2 feet) and Mendenhall Lake (crested at 10.4
feet). A flood advisory was issued for the Taiya during the second,
which was the remnants of Typhoon Shanshan.

The precipitation situation over the southern half of the panhandle
was somewhat different with most locations recording a deficit for
the month. Of note, the Ketchikan area finished the month with less
than half of their normal August precipitation. Despite two
atmospheric river events and multiple precipitation records being
broken, many locations, north and south, are still below normal for
the year for accumulated precipitation, and moderate drought
conditions persist for much of the Southeastern Alaska.

The monthly average temperature departure ranged from half a degree
to 3 degrees above normal for August. Numerous daily high
temperature records were set at various climate and COOP sites, but
none were set at any of the 4 major climate stations. Average
minimum temperatures ranked in the top 10 warmest for the month due
to excessive cloud cover. Not surprisingly, no overnight low
temperature records were set.

$$



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