Climatological Report (Monthly)
Issued by NWS Spokane, WA

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000
CXUS46 KOTX 102127 CCA
CLMLWS

CLIMATE REPORT
NATIONAL WEATHER SERVICE SPOKANE, WA
337 AM PDT WED MAY 1 2019

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

...THE LEWISTON ID AIRPORT CLIMATE SUMMARY FOR THE MONTH OF APRIL 2019...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1881 TO 2019

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              99   04/24/1946
 LOW               20   04/19/1966
HIGHEST            78   04/19        MM      MM       90  04/27
LOWEST             31   04/29        MM      MM       32  04/02
AVG. MAXIMUM     62.6              62.3     0.3     62.8
AVG. MINIMUM     43.6              40.3     3.3     42.0
MEAN             53.1              51.3     1.8     52.4
DAYS MAX >= 90      0               0.0     0.0        1
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      1               2.2    -1.2        1
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.29   1978
 MINIMUM         0.05   1956
TOTALS           2.26              1.32    0.94     1.82
DAILY AVG.       0.08              0.04    0.04     0.06
DAYS >= .01        15              10.2     4.8       14
DAYS >= .10         6               4.0     2.0        6
DAYS >= .50         1               0.4     0.6        0
DAYS >= 1.00        0               0.0     0.0        0
GREATEST
 24 HR. TOTAL    0.65   04/19 TO 04/19              0.36

SNOWFALL (INCHES)
RECORDS
 TOTAL            1.1   1972
TOTALS            0.0               0.0     0.0        T
SINCE 7/1        33.5              10.5    23.0     14.1
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         0               0.0     0.0        0
GREATEST
 SNOW DEPTH         0   MM                             0  MM
 24 HR TOTAL      0.0   04/30 TO 04/30                 T

DEGREE_DAYS
HEATING TOTAL     351               413     -62      374
 SINCE 7/1       5009              4880     129     4681
COOLING TOTAL       1                 2      -1        5
 SINCE 1/1          1                 2      -1        5
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              5.6
HIGHEST WIND SPEED/DIRECTION    36/290    DATE  04/27
HIGHEST GUST SPEED/DIRECTION    47/290    DATE  04/27

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            8
NUMBER OF DAYS PC             12
NUMBER OF DAYS CLOUDY         10

AVERAGE RH (PERCENT)     59

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              3     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       2
LIGHT RAIN               18     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       6     FOG W/VIS <= 1/4 MILE      0
HAZE                      0

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

$$

APRIL 2019 BROUGHT WETTER THAN NORMAL CONDITIONS WITH NEAR NORMAL
TEMPERATURES ACROSS SOUTHEAST WASHINGTON INTO THE SOUTH IDAHO
PANHANDLE.

MOST OF THE RAIN FELL BETWEEN THE 5TH THROUGH THE 9TH WHERE AN
UNUSUAL LATE SEASON ATMOSPHERE RIVER BROUGHT SEVERAL ROUNDS OF RAIN.
 THE PALOUSE WAS ESPECIALLY WET WITH MOSCOW COMING IN WITH 3.47
INCHES AND PULLMAN 2.91 INCHES.  A BURST OF HEAVY RAIN BETWEEN 3-7
PM ON THE 9TH CAUSED SEVERAL CREEKS TO COME OUT OF THEIR BANKS WITH
SIGNIFICANT FLOODING IN PULLMAN/MOSCOW AREA.  EVACUATIONS OCCURRED
IN PULLMAN WITH WATER FROM MISSOURI FLAT CREEK RUSHING ONTO GRANDE
AVENUE WITH SIGNIFICANT DAMAGE. SIGNIFICANT FLOODING WAS ALSO
REPORTED ON FOURMILE CREEK AND ROSE CREEK NORTH OF PULLMAN NEAR
ALBION. MAJOR FLOODING ALSO OCCURRED ON PARADISE CREEK IN MOSCOW.
NUMEROUS HOMES ON EAST D STREET WHERE INUNDATED BY FLOOD WATERS.
FLOODING ALSO IN KAMIAH AREA FROM LAWYERS CREEK. A LARGE MUDSLIDE
OCCURRED ON HIGHWAY 12 NORTH OF KAMIAH CLOSING THE HIGHWAY ON THE
9TH AND 10TH. ALSO OTHER SMALL STREAM FLOODING WITH WATER OVER ROADS
IN LATAH COUNTY.

A BREAK IN THE WEATHER OCCURRED FROM THE 10TH THROUGH THE 17TH THEN
A BRIEF WARM UP BROUGHT TEMPERATURES ON THE 70S ON THE 18TH AND
19TH. THE WARMER WEATHER COMBINED WITH AN INCOMING FRONT RESULTED IN
NUMEROUS SHOWERS WITH EMBEDDED THUNDERSTORMS ON THE 19TH WITH 0.65
INCHES OF RAIN IN LEWISTON WHICH BROKE A RECORD FOR THE DATE.  MILD
AND DRY WEATHER OCCURRED FROM THE 20TH THROUGH THE 26TH BEFORE
COOL...SHOWERY...AND BREEZY CONDITIONS FOR THE REMAINDER OF THE
MONTH.



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