Climatological Report (Monthly)
Issued by NWS Boise, ID

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CXUS55 KBOI 220110 CCA
CLMBOI

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOISE ID
1122 AM MDT WED MAY 1 2019

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

...THE BOISE ID CLIMATE SUMMARY FOR THE MONTH OF APRIL 2019...

APRIL WAS WETTER AND SLIGHTLY WARMER THAN NORMAL. MEASURABLE
PRECIPITATION FELL ON 14 DAYS. TEMPERATURES AVERAGED BELOW-NORMAL ON
ONLY 8 DAYS.

AN UPPER-LEVEL HIGH PRESSURE RIDGE KEPT TEMPERATURES ABOVE NORMAL
THROUGH THE 5TH. DISTURBANCES MOVING THROUGH THE RIDGE BROUGHT
NEARLY DAILY SHOWERS.

AFTER THE RIDGE SHIFTED EAST, RELATIVELY MILD TEMPERATURES WERE
MAINTAINED BY SOUTHWEST FLOW ALOFT AHEAD OF AN APPROACHING UPPER-
LEVEL LOW PRESSURE TROUGH. DAILY SHOWERS CONTINUED. HEAVIER SHOWERS
ON THE 8TH DROPPED NEARLY HALF AN INCH OF RAIN AT THE AIRPORT.

THE TROUGH BROUGHT COOLER AIR AS IT MOVED INLAND AND DEEPENED OVER
THE INTERMOUNTAIN REGION ON THE 9TH AND 10TH. LIGHT SNOW SHOWERS
WERE OBSERVED IN THE COLD UNSTABLE AIR, BUT THERE WERE NO
ACCUMULATIONS.

THE TROUGH EXITED TO THE EAST ON THE 11TH. NORTHWEST FLOW ALOFT
BEHIND THE TROUGH SHIFTED TO WESTERLY ON THE 14TH. A WEATHER SYSTEM
EMBEDDED IN THE FLOW, PLUS MOIST PACIFIC AIR, RESULTED IN RAINFALL
TOTALING OVER HALF AN INCH ON THE 14TH AND 15TH.

A STRONG UPPER-LEVEL RIDGE BUILD OVER THE INTERMOUNTAIN REGION ON
THE 18TH, RESULTING IN THE WARMEST TEMPERATURES SO FAR THIS SPRING.
THE HIGH OF 82 ON THE 19TH WAS THE FIRST 80-DEGREE READING SINCE
SEPTEMBER 29, 2018.

ON THE 20TH A STRONG COLD FRONT IN ADVANCE OF AN UPPER-LEVEL TROUGH
TRIGGERED WET THUNDERSTORMS. ONE SUCH STORM DUMPED NEARLY A QUARTER
INCH OF RAIN IN 20 MINUTES AT THE AIRPORT.

ABOVE-NORMAL TEMPERATURES AND DRY WEATHER CONTINUED FROM THE 21ST
THROUGH THE 26TH, WITH THE JET STREAM AND ITS CHANGEABLE WEATHER
STAYING NORTH OF OUR AREA.

ON THE 27TH THE PATTERN SHIFTED TO NORTHWEST FLOW ALOFT, AND A
SERIES OF DISTURBANCES FROM THE GULF OF ALASKA AND NORTHWEST CANADA
REINFORCED A DEEPENING UPPER-LEVEL TROUGH OVER THE WESTERN U.S. THIS
RESULTED IN THE COOLEST DAILY AVERAGES OF THE MONTH.

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1875 TO 2019

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
HIGHEST            82   04/19
LOWEST             34   04/29
AVG. MAXIMUM     63.0              62.3     0.7
AVG. MINIMUM     43.0              39.3     3.7
MEAN             53.0              50.8     2.2
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32      0
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.73   1869
TOTALS           1.99              1.23    0.76
DAYS >= .01        14
DAYS >= .10         7
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.44   04/08 TO 04/08

SNOWFALL (INCHES)
TOTALS              TR
SINCE 7/1        18.0
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL        T   04/20 TO 04/20

DEGREE_DAYS
HEATING TOTAL     356               429     -73      375
 SINCE 7/1       4994              5224    -230
COOLING TOTAL       2                 3      -1        5
 SINCE 1/1          2                 3      -1
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              9.3
RESULTANT WIND SPEED/DIRECTION   3/311
HIGHEST WIND SPEED/DIRECTION    33/280    DATE  04/21
HIGHEST GUST SPEED/DIRECTION    43/020    DATE  04/30

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM

AVERAGE RH (PERCENT)     58


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

$$



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