Climatological Report (Monthly)
Issued by NWS Boise, ID

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CXUS55 KBOI 011729
CLMBOI

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOISE ID
1125 AM MDT FRI APR 1 2016

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

MARCH 2016 WAS THE SEVENTH WARMEST AT THE AIRPORT...WHERE RECORDS GO
BACK TO 1940. IT WAS A MONTH OF CHANGEABLE AND SOMETIMES EXTREME
WEATHER TYPICAL OF EARLY SPRING.

FROM THE 1ST THROUGH THE 13TH THE TEMPERATURE AVERAGED 8 DEGREES
ABOVE NORMAL. THIS WAS PRIMARILY DUE TO PERSISTENT RELATIVELY WARM
SOUTHWEST FLOW ALOFT. DISTURBANCES EMBEDDED IN THE FLOW WEAKENED AS
THEY MOVED INLAND...BUT THEY CARRIED ENOUGH MOISTURE TO BRING
SHOWERS TO BOISE NEARLY EVERY DAY.

THE PATTERN CHANGED AT MID-MONTH. NORTHWEST FLOW ALOFT FOLLOWED
PASSAGE OF AN UPPER LEVEL TROUGH ON THE 14TH...KEEPING TEMPERATURES
BELOW NORMAL THROUGH THE 18TH. THE LOW OF 28 ON THE 18TH WAS THE
FIRST FREEZING TEMPERATURE SINCE FEBRUARY 25TH.

ON THE 19TH AN UPPER LEVEL RIDGE MADE A BRIEF SOJOURN OVER THE
INTERMOUNTAIN REGION AND TEMPERATURES WERE AGAIN ABOVE NORMAL.

AFTER THE RIDGE DEPARTED TO THE EAST...SOUTHWEST FLOW ALOFT AHEAD OF
A GULF-OF-ALASKA TROUGH KEPT TEMPERATURES ABOVE NORMAL THROUGH THE
21ST. THE 70 DEGREES ON THE 20TH...THE FIRST DAY OF SPRING...WAS THE
HIGH FOR THE MONTH AND THE FIRST 70 SINCE OCTOBER 25TH.

AS THE TROUGH DREW CLOSER ON THE EVENING OF THE 21ST...STRONG
THUNDERSTORMS DEVELOPED ALONG THE COLD FRONT...DUMPING OVER A THIRD
OF AN INCH OF RAIN AT THE AIRPORT. TWO TO THREE TIMES THAT FELL AT
OTHER LOCATIONS AROUND TOWN...ALONG WITH HAIL UP TO GRAPE SIZE WHICH
COVERED THE GROUND IN SOME PLACES.

THAT TROUGH PAVED THE WAY FOR TWO MORE GULF-OF-ALASKA TROUGHS.

A SECOND TROUGH ARRIVED ON THE 25TH...USHERED IN BY CHILLY NORTHWEST
WINDS GUSTING TO 43 MPH AT THE AIRPORT. IN CONTRAST TO THE TROUGH
FOUR DAYS EARLIER THERE WAS ONLY A TRACE OF RAIN. THE WINDS SUBSIDED
THAT EVENING AND SKIES CLEARED...ALLOWING THE TEMPERATURE TO FALL TO
27 DEGREES AFTER A WEEK OF ABOVE-FREEZING LOWS.

THE THIRD AND DEEPEST TROUGH ARRIVED ON THE 28TH. THE COLDEST AIR
WAS ALREADY OVER BOISE EARLY THAT MORNING...REFLECTED BY A LOW OF
28. BY EVENING THE UPPER LEVEL LOW CENTER AND COLDEST AIR HAD
SETTLED OVER THE GREAT BASIN AND CALIFORNIA.

BY THE MORNING OF THE 29TH A DEEP SURFACE LOW HAD FORMED...CENTERED
NEAR THE UTAH-COLORADO BORDER. BY AFTERNOON IT HAD DEVELOPED INTO A
MAJOR SPRING SNOWSTORM FOR THE MAGIC VALLEY AND SOUTHEAST IDAHO.

BOISE...BEING TOO FAR NORTH AND WEST TO SEE ANY PRECIPITATION...
EXPERIENCED ONLY DRY NORTHWEST WINDS...WITH GUSTS IN THE 20-TO-30
MPH RANGE AT THE AIRPORT. IN CONTRAST TO THE COLD WET WEATHER
FARTHER EAST...THE TEMPERATURE AT THE AIRPORT REACHED 60 DEGREES
THAT AFTERNOON...WITH HUMIDITY IN THE 25-TO-30 PERCENT RANGE.

UNDER MOSTLY CLEAR SKIES TEMPERATURES CONTINUED TO WARM ON THE 30TH
AND 31ST IN RESPONSE TO A HIGH PRESSURE RIDGE WHICH EXTENDED FROM
OFF THE CALIFORNIA COAST ALL THE WAY TO ALASKA.

...THE BOISE ID CLIMATE SUMMARY FOR THE MONTH OF MARCH 2016...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1878 TO 2016

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
HIGHEST            70   03/20
LOWEST             27   03/26
AVG. MAXIMUM     57.3              54.6     2.7
AVG. MINIMUM     37.6              34.4     3.2
MEAN             47.5              44.5     3.0
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32      3
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         7.66   1871
TOTALS           1.46              1.39    0.07
DAYS >= .01        13
DAYS >= .10         6
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.36   03/21 TO 03/21

SNOWFALL (INCHES)
TOTALS              T
SINCE 7/1        10.9
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL        T   03/25 TO 03/25

DEGREE_DAYS
HEATING TOTAL     535               636    -101      467
 SINCE 7/1       4284              4795    -511
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              9.0
RESULTANT WIND SPEED/DIRECTION   1/159
HIGHEST WIND SPEED/DIRECTION    32/210    DATE  03/13
HIGHEST GUST SPEED/DIRECTION    43/330    DATE  03/25

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM

AVERAGE RH (PERCENT)     59


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

$$



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