Climatological Report (Annual)
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000
CXAK57 PAJK 021351
CLAYAK

CLIMATE REPORT
NATIONAL WEATHER SERVICE JUNEAU, AK
333 AM AKST TUE JAN 2 2018

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

...THE YAKUTAT CLIMATE SUMMARY FOR THE YEAR OF 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1917 TO 2018

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              88   08/15/2004
 LOW              -24   12/30/1964
HIGHEST            76   07/06        MM      MM       80  06/09
LOWEST             -3   03/07        MM      MM        3  12/15
AVG. MAXIMUM     47.9              46.9     1.0
AVG. MINIMUM     33.8              33.7     0.1
MEAN             40.8              40.3     0.5     44.0
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     39              34.1     4.9       14
DAYS MIN <= 32    155             153.1     1.9      121
DAYS MIN <= 0       2               4.3    -2.3        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM           MM   MM
 MINIMUM           MM   MM
TOTALS         127.64            155.12  -27.48   120.88
DAILY AVG.       0.35              0.42   -0.07
DAYS >= .01       222             240.1   -18.1      231
DAYS >= .10       162             186.2   -24.2      179
DAYS >= .50        78              97.6   -19.6       88
DAYS >= 1.00       41              51.3   -10.3       34
GREATEST
 24 HR. TOTAL    4.21   MM
 STORM TOTAL       MM
 (MM/DD(HH))            MM

SNOWFALL (INCHES)
RECORDS
 TOTAL             MM   MM
 24 HR TOTAL       MM
 SNOW DEPTH        MM   MM
TOTALS          126.9             143.4   -16.5     29.6
 LIQUID EQUIV   12.69             14.30   -1.61
SINCE 7/1        38.1              43.9    -5.8     26.6
 LIQUID 7/1      3.81              4.40   -0.59
SNOWDEPTH AVG.      2                MM      MM
DAYS >= TRACE      79              64.4    14.6       54
DAYS >= 1.0        30              39.5    -9.5        9
GREATEST
 SNOW DEPTH        21   03/19
 24 HR TOTAL     12.0   MM
 STORM TOTAL       MM
 (MM/DD(HH))            MM

DEGREE_DAYS
HEATING TOTAL    8708              9018    -310     7591
 SINCE 7/1         MM              3982      MM
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0

FREEZE DATES
EARLIEST                        09/16
LATEST                          05/25
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              4.9
HIGHEST WIND SPEED/DIRECTION    39/060    DATE  01/07
HIGHEST GUST SPEED/DIRECTION    59/120    DATE  01/27


WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN               52     RAIN                     110
LIGHT RAIN              207     FREEZING RAIN              1
LT FREEZING RAIN          2     HAIL                       1
HEAVY SNOW               15     SNOW                      30
LIGHT SNOW               74     SLEET                     10
FOG                     287     FOG W/VIS <= 1/4 MILE     47
HAZE                     34

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

$$

THE YEAR BEGAN ON A WINDY NOTE WITH HIGH WIND WARNINGS BEING
ISSUED ON 5 SEPARATE OCCASIONS THROUGHOUT THE MONTH OF JANUARY.
NORMAL OR BELOW NORMAL TEMPERATURES AT THE START OF THE MONTH WERE
REPLACED WITH ABOVE NORMAL CONDITIONS DURING THE SECOND HALF OF
THE MONTH. THIS COINCIDED WITH A RETURN OF PRECIPITATION, WITH A
SIGNIFICANT PERCENTAGE OF IT FALLING IN THE FORM OF RAIN RATHER
THAN SNOW. YAKUTAT, THE FAR NORTHERN INNER CHANNELS, AND MISTY
FJORDS DID SEE CLOSER TO NORMAL SNOWFALL FOR THE MONTH HOWEVER.
WARM AND WET CONDITIONS RETURNED IN FEBRUARY AND THE
CLIMATOLOGICAL END OF WINTER. AFTER A BRIEF AND SLIGHT COOL DOWN
AT THE START OF THE MONTH, TEMPERATURES ACROSS SOUTHEAST ALASKA
WARMED UP ABRUPTLY DURING THE SECOND WEEK OF THE MONTH. RECORD
HIGH TEMPERATURES WERE REPORTED ON OR AROUND VALENTINE`S DAY IN
MULTIPLE LOCATIONS. THIS ALSO COINCIDED WITH A RETURN OF
SIGNIFICANT PRECIPITATION TO THE PANHANDLE, WITH MOST OF IT
FALLING AS RAIN. APART FROM THE YAKUTAT AREA, SNOWFALL IN FEBRUARY
TRENDED AROUND NORMAL, TO WELL BELOW NORMAL IN THE CASE OF JUNEAU.
THE SOUTHERN PANHANDLE WAS ON TRACK FOR A RECORD LOW MONTHLY SNOW
TOTAL UNTIL THE VERY END OF THE MONTH WHEN A SIGNIFICANT LATE
WINTER STORM HIT THE REGION. VERY HEAVY SNOWFALL THAT BEGAN AT THE
TAIL END OF FEBRUARY CONTINUED FOR THE FIRST HALF OF MARCH. WHAT
WAS MOST UNUSUAL ABOUT THESE SNOW EVENTS IS THAT THEY WERE NOT
FOLLOWED IMMEDIATELY BY LOW LEVEL WARM AIR ADVECTION AND A
TRANSITION FROM SNOW TO RAIN. IN FACT, AN EXTENDED COLD OUTFLOW
EVENT FOLLOWED THE FIRST MAJOR SNOW EVENT WHICH ALLOWED SNOW TO
REMAIN ON THE GROUND AND PRESENT A TRUE WINTER SCENE OVER MOST OF
THE PANHANDLE. ACCUMULATING SNOW CONTINUED THROUGH THE END OF
MARCH FOR CENTRAL AND NORTHERN LOCATIONS. BITTERLY COLD
TEMPERATURES ALSO RESULTED IN A PROTRACTED WIND CHILL ADVISORY FOR
THE KLONDIKE HIGHWAY AS WELL AS PERIODS OF HEAVY FREEZING SPRAY
FOR SEVERAL OF THE INNER CHANNELS. A WINTERY START TO APRIL WAS
SOON REPLACED BY WARMER THAN NORMAL TEMPERATURES, DRY CONDITIONS,
AND CLEAR SKIES IN THE SECOND WEEK OF THE MONTH. SEVERAL RECORD
WARM TEMPERATURES WERE REPORTED DURING THIS TIME. A COLD AIR MASS
MOVED IN FROM THE YUKON TOWARD THE END OF THE THIRD WEEK OF THE
MONTH AND PRODUCED SOME LATE SEASON SNOW OVER THE NORTHERN INNER
CHANNELS, BUT THE WARMER THAN NORMAL WEATHER RETURNED FOR THE LAST
WEEK OF THE MONTH, WHEN MORE RECORD HIGH TEMPERATURES WERE
OBSERVED. MAY FEATURED A MIX OF BEAUTIFUL SPRING WEATHER AND ABOVE
NORMAL RAINS. AN ATMOSPHERIC RIVER DEVELOPED IN THE SECOND HALF OF
THE MONTH AND RESULTED IN RECORD RAINFALL FOR A LARGE PORTION OF
THE PANHANDLE FROM THE 20TH TO THE 22ND OF THE MONTH. NUMEROUS
LOCATIONS REPORTED 24 HOUR TOTALS OF 2 INCHES OR MORE. THE MONTH
CONCLUDED WITH A FINE MEMORIAL DAY WEEKEND. THE CLEAR SKIES DURING
THAT WEEKEND ALLOWED FOR OVERNIGHT LOWS AT OR BELOW FREEZING IN
VARIOUS LOCATIONS, WHICH IS LATER THAN NORMAL FOR THE LAST FREEZE
OF THE SEASON. WET AND COOL CONDITIONS PREVAILED FOR THE MONTH OF
JUNE AND 2-3 INCHES OF SNOW FELL ON JUNE 17TH AT CHILKAT PASS,
RESULTING IN THE CANCELLATION OF ANNUAL KLUANE-CHILKAT BIKE RELAY
RACE. A BREAK IN THE COOL AND CLOUDY CONDITIONS IN THE SECOND WEEK
ALLOWED FOR SUFFICIENT SNOWMELT TO RAISE THE CHILKAT AND TAIYA
RIVERS TO MINOR FLOOD LEVELS. ADDITIONALLY, SNOWMELT CAUSED
SUICIDE BASIN TO RELEASE INTO MENDENHALL LAKE MULTIPLE TIMES
DURING THE MONTH. THE GENERAL LACK OF SUMMER TEMPERATURES AND
EXCESSIVE RAIN CONTINUED IN JULY AND MANY LOCATIONS RECEIVED THEIR
NORMAL JULY RAIN TOTALS PRIOR TO THE MIDDLE OF THE MONTH. RAINFALL
DIMINISHED TOWARDS THE MIDDLE OF THE MONTH, BUT THEN CAME BACK
WITH A VENGEANCE BY THE END OF THE MONTH, RESULTING IN RECORD
SETTING RAINS FOR THE LAST WEEKEND OF THE MONTH IN SOUTHERN
LOCATIONS. THE EXCESSIVE RAIN COMBINED WITH A LACK OF TRULY WARM
SUMMER TEMPERATURES RESULTED IN THE SUMMER THAN WASN`T;
TEMPERATURES OVER A LARGE PORTION OF THE CENTRAL AND SOUTHERN
ZONES NEVER ROSE OUT OF THE 60S DURING THE ENTIRE MONTH. AUGUST
PROVED TO BE WETTER THAN NORMAL AS WELL, BUT PROVIDED A BRIEF
RETURN TO TRUE SUMMER CONDITIONS FOR THE FIRST WEEK AND A HALF.
DURING THAT TIME, MOST LOCATIONS SAW DRY WEATHER AND DAYTIME HIGHS
WELL ABOVE NORMAL WITH AT LEAST 16 SITES SEEING TEMPS OF 80
DEGREES OR HIGHER. TOPPING THE LIST WAS SKAGWAY AIRPORT, WHERE THE
MERCURY ROSE TO 93 DEGREES ON AUGUST 5TH. COOL TEMPERATURES AND
OVERLY WET CONDITIONS RETURNED BY THE MIDDLE OF THE MONTH.
KETCHIKAN AIRPORT RECORDED OVER 9 INCHES OF RAIN IN A THREE DAY
PERIOD AND BY THE END OF THE MONTH, HELD THE DUBIOUS DISTINCTION
AS HAVING EXPERIENCED THE WETTEST SUMMER ON RECORD WITH A THREE
MONTH TOTAL OF 46.99 INCHES OF RAIN. SEPTEMBER WAS MOSTLY NORMAL,
WITH A FEW NOTABLE TEMPERATURE AND PRECIPITATION RECORDS DURING
THE FIRST WEEK. A SECOND ATMOSPHERIC RIVER EVENT AT THE END OF THE
MONTH PRODUCED MORE DAILY PRECIPITATION RECORDS. OCTOBER SAW BELOW
NORMAL PRECIPITATION AND GENUINELY NICE AUTUMN WEATHER FOR MOST OF
THE MONTH. NOVEMBER BROUGHT THE FIRST OF THE TRUE WINTER WEATHER
TO SOUTHEAST ALASKA. ALMOST AS IF ON CUE, TEMPERATURES ACROSS THE
PANHANDLE FELL BELOW NORMAL AT THE START OF THE MONTH...AND KEPT
FALLING. THE REASON FOR THIS WAS A VERY STRONG AND PERSISTENT HIGH
PRESSURE CENTER OVER WESTERN CANADA. THE RESULTING COLD, DRY
CONTINENTAL AIR MASS OUTFLOW WINDS PRODUCED AND EXTENDED PERIOD OF
SMALL CRAFT AND GALE FORCE WINDS OVER THE NORTHERN INNER CHANNELS
THAT LASTED FOR MANY DAYS, COMPLICATING TRAVEL PLANS FOR BOATERS,
FISHERMEN, AND HUNTERS. THE COLDER THAN NORMAL TEMPERATURES ALSO
PRODUCED ABUNDANT EARLY SEASON SNOWFALL, PARTICULARLY DURING THE
SECOND HALF OF THE MONTH, EVEN THOUGH ACCUMULATED MONTHLY
PRECIPITATION WAS WELL BELOW NORMAL. THIS WAS ESPECIALLY
NOTEWORTHY IN YAKUTAT, WHICH FINISHED THE MONTH MORE THAN 1 FOOT
BELOW NORMAL OF ACCUMULATED PRECIPITATION FOR JUST THAT SINGLE
MONTH EVEN THOUGH THEY SAW WELL ABOVE NORMAL SNOWFALL. AS COLD AS
NOVEMBER WAS, DECEMBER WAS THAT MUCH WARMER THAN NORMAL. NUMEROUS
DAILY HIGH TEMPERATURE RECORDS WERE SET IN THE FIRST HALF OF THE
MONTH WITH HIGHS REACHING THE 60S OVER THE SOUTHERN PANHANDLE. ON
MANY NIGHTS DURING THOSE TWO WEEKS, OVERNIGHT LOWS WERE WARMER
THAN THE NORMAL DAYTIME HIGHS AND AT ONE POINT IN TIME, THE
TEMPERATURE ROSE TO 57 DEGREES IN THE MENDENHALL VALLEY OVERNIGHT.
DECEMBER SAW THE RETURN OF NORMAL PRECIPITATION TO SOUTHEAST
ALASKA. UNFORTUNATELY, WITH THE WARM TEMPERATURES, IT PRIMARILY
FELL AS RAIN AND EVENTUALLY ALL OF THE LOW ELEVATION SNOWPACK
MELTED. WELL BELOW NORMAL TEMPERATURES RETURNED FOR THE SECOND
HALF OF THE MONTH AS HIGH PRESSURE ONCE AGAIN SET UP OVER WESTERN
CANADA. A COMBINATION OF SOME LIGHT SNOW AND EXTENSIVE HOARFROST
PROVIDED FOR A REASONABLY WHITE CHRISTMAS FOR SOME LOCATIONS. EVEN
SO, MOST LOCATIONS FINISHED OUT 2017 WITH ABOVE NORMAL
TEMPERATURES AND BELOW NORMAL PRECIPITATION FOR DECEMBER EXCEPT
FOR JUNEAU WHICH ONCE AGAIN POSTED ABOVE NORMAL MONTHLY
PRECIPITATION BUT HARDLY ANY SNOW.

$$



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