Climatological Report (Monthly)
Issued by NWS Boise, ID

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CXUS55 KBOI 030433 CCA
CLMBOI

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOISE ID
1035 PM MDT SUN APR 2 2017

MARCH 2017 WAS WARM AND WET, WITH A MAJOR STORM TO FINISH OUT THE
MONTH.

WITHOUT THAT STORM, MARCH WOULD ACTUALLY HAVE BEEN SLIGHTLY DRIER
THAN AVERAGE. BUT WITH 2.86 INCHES, IT TURNED OUT TO BE THE SECOND
WETTEST MARCH AT THE BOISE AIRPORT, AND THE SEVENTH WETTEST MARCH
GOING BACK TO 1878 IN THE BOISE AREA. THE 1.40 INCHES ON THE 30TH
TIED JANUARY 16, 1896 AS THE TENTH WETTEST DAY IN THE BOISE AREA. AT
THE AIRPORT IT WAS THE SEVENTH WETTEST DAY.

THERE WERE SHOWERS EACH DAY FROM THE 3RD THROUGH THE 11TH, AND THERE
WAS MEASURABLE PRECIPITATION ON NEARLY HALF THE DAYS FROM THE 12TH
THROUGH THE 31ST.

THE AVERAGE TEMPERATURE OF 48.9 DEGREES TIED 1992 AS THE SECOND
WARMEST MARCH AT THE BOISE AIRPORT, AND THE FIFTH WARMEST MARCH
GOING BACK TO 1878 IN THE BOISE AREA.

THERE WERE NO RECORD HIGH TEMPERATURES, BUT THE LOWS OF 52 ON THE
18TH AND 48 ON THE 20TH BROKE THE PREVIOUS DAILY RECORDS FOR WARMEST
LOWS. THE 49 ON THE 19TH TIED THE RECORD HIGH LOW FOR THAT DATE.
THERE WERE NO FREEZING TEMPERATURES FROM THE 8TH THROUGH THE 27TH.

DURING THE FIRST 28 DAYS OF THE MONTH THERE WERE NO SIGNIFICANT
STORMS. PREDOMINANTLY WESTERLY OR SOUTHWESTERLY FLOW ALOFT AND
EASTWARD MIGRATING HIGH PRESSURE RIDGES KEPT TEMPERATURES MILD.
MINOR WEATHER SYSTEMS MOVING INLAND FROM THE PACIFIC PROVIDED LIGHT
PRECIPITATION.

ON THE MORNING OF THE 29TH, AN ORDINARY LOOKING UPPER LEVEL TROUGH
OFF THE BRITISH COLUMBIA COAST WAS APPROACHING THE NORTHWEST U.S. BY
EVENING IT HAD NOTICEABLY DEEPENED AS IT NEARED THE WASHINGTON
COAST. A THIRD OF AN INCH OF RAIN FELL AT THE AIRPORT THAT EVENING,
WAY OUT AHEAD OF THE MAIN STORM.

THE RAIN STOPPED BEFORE MIDNIGHT, ONLY TO RESUME JUST BEFORE 7 AM
MDT ON THE 30TH AS THE COLD FRONT APPROACHED. AS THE FRONT PASSED
BOISE AROUND 8:30 AM, THE RAIN BECAME HEAVY, AND WEST WINDS
INCREASED TO AROUND 25 MPH. THE RAIN CHANGED TO SNOW JUST BEFORE 10
AM, BUT ONLY A TRACE FELL BEFORE THE SNOW ENDED SHORTLY AFTER 11 AM.

JUST OVER ONE INCH OF PRECIPITATION FELL IN 6 HOURS ON THE MORNING
OF THE 30TH. INTERESTINGLY, THE AMOUNT OF MOISTURE AVAILABLE FOR
PRECIPITATION, MEASURED BY RADIOSONDE DURING THE TWO HOURS BEFORE
THE RAIN STARTED, WAS A MERE HALF INCH. SO HOW COULD NEARLY THREE
TIMES THAT AMOUNT FALL ON BOISE?

AS THE UPPER LEVEL TROUGH RAPIDLY INTENSIFIED DIRECTLY OVER
SOUTHWEST IDAHO, MORE MOISTURE WAS PULLED IN FROM OUTLYING AREAS AND
LIFTED OVER THE TREASURE VALLEY. AT THE SAME TIME, THE STRONG COLD
FRONT PROVIDED ADDITIONAL LIFT TO TURN THAT MOISTURE INTO RAIN AND
SNOW. ALSO, A CLOSED CIRCULATION DEVELOPED ALOFT, SLOWING THE STORM
MOVEMENT. THIS ALLOWED MORE TIME FOR PRECIPITATION TO ACCUMULATE.

AS THE SYSTEM STRENGTHENED AT UPPER LEVELS, SURFACE LOW PRESSURE TO
OUR EAST DEEPENED, CAUSING NORTHWEST WINDS TO INCREASE THROUGH THE
AFTERNOON. A PEAK GUST OF 52 MPH WAS MEASURED AT THE AIRPORT AT 4:06
PM.

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

...THE BOISE ID CLIMATE SUMMARY FOR THE MONTH OF MARCH 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1875 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
HIGHEST            74   03/14
LOWEST             30   03/01
AVG. MAXIMUM     58.3              54.6     3.7
AVG. MINIMUM     39.6              34.4     5.2
MEAN             48.9              44.5     4.4
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32      6
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         7.66   1871
TOTALS           2.86              1.39    1.47
DAYS >= .01        17
DAYS >= .10         8
DAYS >= .50         1
DAYS >= 1.00        1
GREATEST
 24 HR. TOTAL    1.73   03/30 TO 03/30

SNOWFALL (INCHES)
TOTALS            0.2
SINCE 7/1        39.0
GREATEST
 SNOW DEPTH         T   03/06
 24 HR TOTAL      0.2   03/06 TO 03/06

DEGREE_DAYS
HEATING TOTAL     492               636    -144      535
 SINCE 7/1       4779              4795     -16
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              9.7
RESULTANT WIND SPEED/DIRECTION   3/125
HIGHEST WIND SPEED/DIRECTION    38/340    DATE  03/30
HIGHEST GUST SPEED/DIRECTION    52/320    DATE  03/30

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM

AVERAGE RH (PERCENT)     60


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

$$



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