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Storm Impacting the Northwest U.S.; Fire Weather Conditions in Southern California; Severe Weather in the South

A Pacific storm is bringing areas of low elevation rain, moderate to heavy mountain snow, and high winds to the Northwest. Strong Santa Ana winds and very dry conditions are producing elevated to critical fire weather conditions in southern California. Isolated strong to severe thunderstorms are possible through early Wednesday morning across parts of northeast Texas into western Tennessee. Read More >

 

April 2021 was dry and cool across eastern Kentucky.  Jackson averaged 57.0 

degrees which is almost a half a degree below normal. London finished April 

2021 with a reading of 54.5  degrees which is two degrees cooler than normal.

Jackson totaled 3.39 inches of  precipitation for April which is near a half an

inch below normal. London measured 1.45 inches of precipitation for April 2021

which is over two and a half inches drier than normal. Also of note, April 2021

was the second driest April at London.  Climate data for Jackson dates back to 

1981 while weather records began in 1954 at London.

 

The following are the April climate summaries for Jackson and London as

well as the April Local Climatological Data reports for Jackson and London:

 

...THE JACKSON KY CLIMATE SUMMARY FOR THE MONTH OF APRIL 2021...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1981 TO 2021

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             92   04/27/1986
 LOW              20   04/07/1982
HIGHEST           86   04/27         86       0       81  04/08
                                                          04/07
LOWEST            26   04/02         29      -3       30  04/15
AVG. MAXIMUM    67.7               68.0    -0.3     64.9
AVG. MINIMUM    46.2               46.7    -0.5     43.8
MEAN            57.0               57.4    -0.4     54.3
DAYS MAX >= 90     0                0.2    -0.2        0
DAYS MAX <= 32     0                0.1    -0.1        0
DAYS MIN <= 32     5                1.9     3.1        3
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM       10.29   2015
 MINIMUM        0.78   1985
TOTALS          3.39               3.83   -0.44     4.69
DAILY AVG.      0.11               0.13   -0.02     0.16
DAYS >= .01        9               12.4    -3.4       16
DAYS >= .10        6                8.2    -2.2        9
DAYS >= .50        2                2.7    -0.7        5
DAYS >= 1.00       1                0.7     0.3        0
GREATEST
 24 HR. TOTAL   1.19   04/28 TO 04/29               0.78

SNOWFALL (INCHES)
RECORDS
 TOTAL          17.8   1987
TOTALS           0.2                1.0    -0.8      0.5
SINCE 7/1       28.6               23.5     5.1      7.1
SNOWDEPTH AVG.     0                                   0
DAYS >= 1.0        0                0.3    -0.3        0
GREATEST
 SNOW DEPTH        0                                   0
 24 HR TOTAL     0.1   04/01 TO 04/01                0.4
                       04/21 TO 04/21

DEGREE DAYS
HEATING TOTAL    265                268      -3      323
 SINCE 7/1      3741               4122    -381     3512
COOLING TOTAL     31                 39      -8       11
 SINCE 1/1        35                 46     -11       35
................................................................

WIND (MPH)
AVERAGE WIND SPEED              4.2
HIGHEST WIND SPEED/DIRECTION    21/290    DATE  04/30
HIGHEST GUST SPEED/DIRECTION    36/300    DATE  04/30

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.36
NUMBER OF DAYS FAIR           13
NUMBER OF DAYS PC             14
NUMBER OF DAYS CLOUDY          3

AVERAGE RH (PERCENT)     55

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              2     MIXED PRECIP               0
HEAVY RAIN                4     RAIN                       7
LIGHT RAIN               11     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                1     SNOW                       0
LIGHT SNOW                2     SLEET                      0
FOG                      12     FOG W/VIS <= 1/4 MILE      2
HAZE                      1

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

$$

 

PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6)

                                          STATION:   JACKSON KY
                                          MONTH:     APRIL
                                          YEAR:      2021
                                          LATITUDE:   37 35 N
                                          LONGITUDE:  83 19 W

  TEMPERATURE IN F:       :PCPN:    SNOW:  WIND      :SUNSHINE: SKY     :PK WND
================================================================================
1   2   3   4   5  6A  6B    7    8   9   10  11  12  13   14  15   16   17  18
                                     12Z  AVG MX 2MIN
DY MAX MIN AVG DEP HDD CDD  WTR  SNW DPTH SPD SPD DIR MIN PSBL S-S WX    SPD DR
================================================================================

 1  40  30  35 -18  30   0 0.01  0.1    0  8.4 17 330   M    M   8 1      27 320
 2  47  26  37 -16  28   0 0.00  0.0    0  3.7 12 300   M    M   1        17  20
 3  63  31  47  -7  18   0 0.00  0.0    0  3.5 10 160   M    M   0        16 170
 4  73  45  59   5   6   0 0.00  0.0    0  5.0 12 310   M    M   0        19 280
 5  77  49  63   9   2   0 0.00  0.0    0  4.1 12 250   M    M   0        21 270
 6  79  53  66  12   0   1 0.00  0.0    0  3.6 10 250   M    M   0        17 270
 7  82  57  70  15   0   5 0.00  0.0    0  3.0  9 170   M    M   1        15 160
 8  73  58  66  11   0   1 0.79  0.0    0  6.0 14 280   M    M   6 13     27 170
 9  81  56  69  13   0   4 0.00  0.0    0  4.7 12 190   M    M   0        20 170
10  75  60  68  12   0   3 0.21  0.0    0  5.6 16 140   M    M   4 1      30 130
11  70  52  61   5   4   0 0.04  0.0    0  5.1 17 240   M    M   6 1      34 210
12  69  46  58   2   7   0 0.00  0.0    0  5.3 18 280   M    M   3        31 300
13  72  48  60   3   5   0    T  0.0    0  1.2  8 260   M    M   4        13 250
14  63  48  56  -1   9   0 0.24  0.0    0  2.1  8  10   M    M   6 1      18  10
15  55  43  49  -8  16   0 0.00  0.0    0  5.8 14 310   M    M   6 1      26 340
16  62  36  49  -9  16   0 0.00  0.0    0  2.8 10 320   M    M   1        17 340
17  63  44  54  -4  11   0    T  0.0    0  1.2  9 330   M    M   8        15 320
18  64  43  54  -4  11   0 0.00  0.0    0  1.9 13 340   M    M   4        22 290
19  69  47  58   0   7   0    T  0.0    0  4.7 13 270   M    M   5        21 320
20  73  47  60   1   5   0 0.00  0.0    0  4.6 13 180   M    M   2        22 210
21  59  32  46 -13  19   0 0.05  0.1    0  6.9 16 300   M    M   8 1      26 280
22  55  30  43 -16  22   0    T  0.0    0  4.2 17 290   M    M   5        29 290
23  62  36  49 -11  16   0 0.00  0.0    0  2.7 10 250   M    M   5        16 270
24  52  48  50 -10  15   0 0.42  0.0    0  2.9  8 170   M    M   7 1      15  70
25  62  47  55  -5  10   0    T  0.0    0  3.3 10 310   M    M   7 1      17 280
26  79  43  61   1   4   0 0.00  0.0    0  1.9  8 170   M    M   0        15 220
27  86  60  73  12   0   8 0.00  0.0    0  4.9 15 230   M    M   0 8      29 260
28  83  65  74  13   0   9 1.14  0.0    0  4.0 13 190   M    M   6 123    23 180
29  71  56  64   3   1   0 0.49  0.0    0  5.8 15 310   M    M   7 12     29 220
30  72  51  62   1   3   0 0.00  0.0    0  7.0 21 290   M    M   2 1      36 300
================================================================================
SM 2031 1387       265  31  3.39  0.2    125.9          M      112
================================================================================
AV 67.7 46.2                               4.2 FASTST   M    M   4    MAX(MPH)
                                 MISC ---->    21 290                 36 300
================================================================================
NOTES:
# LAST OF SEVERAL OCCURRENCES

COLUMN 17 PEAK WIND IN M.P.H.

PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6) , PAGE 2

                                          STATION:   JACKSON KY
                                          MONTH:     APRIL
                                          YEAR:      2021
                                          LATITUDE:   37 35 N
                                          LONGITUDE:  83 19 W

[TEMPERATURE DATA]      [PRECIPITATION DATA]       SYMBOLS USED IN COLUMN 16

AVERAGE MONTHLY: 57.0   TOTAL FOR MONTH:   3.39    1 = FOG OR MIST
DPTR FM NORMAL:  -0.4   DPTR FM NORMAL:   -0.44    2 = FOG REDUCING VISIBILITY
HIGHEST:    86 ON 27    GRTST 24HR  1.19 ON 28-29      TO 1/4 MILE OR LESS
LOWEST:     26 ON  2                               3 = THUNDER
                        SNOW, ICE PELLETS, HAIL    4 = ICE PELLETS
                        TOTAL MONTH:   0.2 INCH    5 = HAIL
                        GRTST 24HR   0.1 ON  1- 1  6 = FREEZING RAIN OR DRIZZLE
                        GRTST DEPTH:  0            7 = DUSTSTORM OR SANDSTORM:
                                                       VSBY 1/2 MILE OR LESS
                                                   8 = SMOKE OR HAZE
[NO. OF DAYS WITH]      [WEATHER - DAYS WITH]      9 = BLOWING SNOW
                                                   X = TORNADO
MAX 32 OR BELOW:   0    0.01 INCH OR MORE:   9
MAX 90 OR ABOVE:   0    0.10 INCH OR MORE:   6
MIN 32 OR BELOW:   5    0.50 INCH OR MORE:   2
MIN  0 OR BELOW:   0    1.00 INCH OR MORE:   1

[HDD (BASE 65) ]
TOTAL THIS MO.   265    CLEAR  (SCALE 0-3)  13
DPTR FM NORMAL    -3    PTCLDY (SCALE 4-7)  17
TOTAL FM JUL 1  3741    CLOUDY (SCALE 8-10)  0
DPTR FM NORMAL  -381

[CDD (BASE 65) ]
TOTAL THIS MO.    31
DPTR FM NORMAL    -8    [PRESSURE DATA]
TOTAL FM JAN 1    35    HIGHEST SLP 30.55 ON  2
DPTR FM NORMAL   -11    LOWEST  SLP 29.49 ON 11

[REMARKS]
#FINAL-04-21#

 

London Kentucky data:

 

...THE LONDON KY CLIMATE SUMMARY FOR THE MONTH OF APRIL 2021...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1954 TO 2021

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             90   04/10/1995
                       04/27/1986
 LOW              19   04/08/2007
HIGHEST           84   04/27         MM      MM       80  04/07
LOWEST            24   04/02         MM      MM       28  04/15
AVG. MAXIMUM    67.2               68.6    -1.4     65.5
AVG. MINIMUM    41.7               44.5    -2.8     41.4
MEAN            54.5               56.5    -2.0     53.4
DAYS MAX >= 90     0                0.1    -0.1        0
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MIN <= 32     6                3.2     2.8        5
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM       10.23   2011
 MINIMUM        0.58   1976
TOTALS          1.45               4.05   -2.60     4.34
DAILY AVG.      0.05               0.14   -0.09     0.14
DAYS >= .01        7               12.0    -5.0       15
DAYS >= .10        4                7.9    -3.9        7
DAYS >= .50        1                2.8    -1.8        3
DAYS >= 1.00       0                0.9    -0.9        1
GREATEST
 24 HR. TOTAL   0.50   04/29 TO 04/29               1.41

SNOWFALL (INCHES)
RECORDS
 TOTAL           9.0   1987
TOTALS            MM                1.0      MM       MM
SINCE 7/1         MM               10.3      MM       MM
SNOWDEPTH AVG.    MM                                  MM
DAYS >= 1.0       MM                0.3      MM       MM
GREATEST
 SNOW DEPTH       MM                                  MM
 24 HR TOTAL      MM                                  MM

DEGREE DAYS
HEATING TOTAL    322                276      46      344
 SINCE 7/1      4000               4100    -100     3691
COOLING TOTAL     13                 23     -10        5
 SINCE 1/1        13                 26     -13       27
................................................................

WIND (MPH)
AVERAGE WIND SPEED              5.1
HIGHEST WIND SPEED/DIRECTION    25/260    DATE  04/11
HIGHEST GUST SPEED/DIRECTION    38/220    DATE  04/11

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.35
NUMBER OF DAYS FAIR           13
NUMBER OF DAYS PC             16
NUMBER OF DAYS CLOUDY          1

AVERAGE RH (PERCENT)     62

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       4
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                1     SLEET                      0
FOG                      13     FOG W/VIS <= 1/4 MILE      1
HAZE                      3

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

$$

 

PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6)

                                          STATION:   LONDON KY
                                          MONTH:     APRIL
                                          YEAR:      2021
                                          LATITUDE:   37  4 N
                                          LONGITUDE:  84  5 W

  TEMPERATURE IN F:       :PCPN:    SNOW:  WIND      :SUNSHINE: SKY     :PK WND
================================================================================
1   2   3   4   5  6A  6B    7    8   9   10  11  12  13   14  15   16   17  18
                                     12Z  AVG MX 2MIN
DY MAX MIN AVG DEP HDD CDD  WTR  SNW DPTH SPD SPD DIR MIN PSBL S-S WX    SPD DR
================================================================================

 1  40  29  35 -17  30   0 0.00    M    M  9.3 18 330   M    M   4        28 330
 2  48  24  36 -16  29   0 0.00    M    M  4.5 14  20   M    M   0        19 360
 3  63  25  44  -9  21   0 0.00    M    M  2.6 12 190   M    M   0        18 210
 4  71  35  53   0  12   0 0.00    M    M  3.1 15 250   M    M   0        18 260
 5  76  37  57   4   8   0 0.00    M    M  2.2 13 250   M    M   0 8      20 190
 6  77  43  60   6   5   0 0.00    M    M  2.6 14 260   M    M   1        21 260
 7  81  47  64  10   1   0 0.00    M    M  3.4 13 210   M    M   1        19 200
 8  71  55  63   9   2   0 0.16    M    M  7.5 23 190   M    M   6 13     33 180
 9  80  47  64   9   1   0 0.00    M    M  4.8 15 170   M    M   1 1      23 180
10  71  52  62   7   3   0 0.23    M    M  5.5 18 150   M    M   6 1      27 140
11  70  52  61   6   4   0 0.00    M    M 11.8 25 260   M    M   2        38 220
12  71  42  57   1   8   0 0.00    M    M  5.8 18 290   M    M   0        27 270
13  69  45  57   1   8   0    T    M    M  0.9  7 360   M    M   5         9  20
14  65  49  57   1   8   0 0.02    M    M  5.8 16 340   M    M   6 1      25 340
15  58  39  49  -7  16   0 0.00    M    M  5.8 17 290   M    M   4        25 280
16  63  33  48  -9  17   0 0.00    M    M  2.5 13 290   M    M   1        16 360
17  61  40  51  -6  14   0    T    M    M  3.5 12 290   M    M   7        17 300
18  64  36  50  -7  15   0 0.00    M    M  1.1  8  40   M    M   5 1      12  40
19  66  45  56  -2   9   0    T    M    M  3.8 16 260   M    M   5        21 270
20  72  38  55  -3  10   0 0.00    M    M  5.7 18 310   M    M   2 18     28 320
21  52  30  41 -17  24   0 0.06    M    M  8.1 23 300   M    M   7 18     31 300
22  55  28  42 -17  23   0 0.00    M    M  5.5 21 260   M    M   5 1      30 260
23  59  31  45 -14  20   0 0.00    M    M  3.0 15 210   M    M   6        22 250
24  57  44  51  -8  14   0 0.43    M    M  4.6 14 350   M    M   8 1      23 110
25  66  45  56  -3   9   0 0.00    M    M  5.0 16 340   M    M   7        23 340
26  78  38  58  -2   7   0 0.00    M    M  2.8 10 180   M    M   0 1      15 180
27  84  51  68   8   0   3 0.00    M    M  6.8 21 190   M    M   0        31 250
28  83  65  74  14   0   9 0.05    M    M  7.8 22 250   M    M   7 1      31 250
29  72  59  66   6   0   1 0.50    M    M  8.3 20 200   M    M   6 1      33 220
30  73  48  61   0   4   0 0.00    M    M  8.6 20 330   M    M   4 12     32 340
================================================================================
SM 2016 1252       322  13  1.45    M    152.7          M      106
================================================================================
AV 67.2 41.7                               5.1 FASTST   M    M   4    MAX(MPH)
                                 MISC ---->    25 260                 38 220
================================================================================
NOTES:
# LAST OF SEVERAL OCCURRENCES

COLUMN 17 PEAK WIND IN M.P.H.

PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6) , PAGE 2

                                          STATION:   LONDON KY
                                          MONTH:     APRIL
                                          YEAR:      2021
                                          LATITUDE:   37  4 N
                                          LONGITUDE:  84  5 W

[TEMPERATURE DATA]      [PRECIPITATION DATA]       SYMBOLS USED IN COLUMN 16

AVERAGE MONTHLY: 54.5   TOTAL FOR MONTH:   1.45    1 = FOG OR MIST
DPTR FM NORMAL:  -2.0   DPTR FM NORMAL:   -2.60    2 = FOG REDUCING VISIBILITY
HIGHEST:    84 ON 27    GRTST 24HR  0.50 ON 28-29      TO 1/4 MILE OR LESS
LOWEST:     24 ON  2                               3 = THUNDER
                        SNOW, ICE PELLETS, HAIL    4 = ICE PELLETS
                        TOTAL MONTH:  M            5 = HAIL
                        GRTST 24HR    M  ON   M    6 = FREEZING RAIN OR DRIZZLE
                        GRTST DEPTH:  M  ON   M    7 = DUSTSTORM OR SANDSTORM:
                                                       VSBY 1/2 MILE OR LESS
                                                   8 = SMOKE OR HAZE
[NO. OF DAYS WITH]      [WEATHER - DAYS WITH]      9 = BLOWING SNOW
                                                   X = TORNADO
MAX 32 OR BELOW:   0    0.01 INCH OR MORE:   7
MAX 90 OR ABOVE:   0    0.10 INCH OR MORE:   4
MIN 32 OR BELOW:   6    0.50 INCH OR MORE:   1
MIN  0 OR BELOW:   0    1.00 INCH OR MORE:   0

[HDD (BASE 65) ]
TOTAL THIS MO.   322    CLEAR  (SCALE 0-3)  13
DPTR FM NORMAL    46    PTCLDY (SCALE 4-7)  17
TOTAL FM JUL 1  4000    CLOUDY (SCALE 8-10)  0
DPTR FM NORMAL  -100

[CDD (BASE 65) ]
TOTAL THIS MO.    13
DPTR FM NORMAL   -10    [PRESSURE DATA]
TOTAL FM JAN 1    13    HIGHEST SLP 30.57 ON  2
DPTR FM NORMAL   -13    LOWEST  SLP 29.51 ON 11

[REMARKS]
#FINAL-04-21#