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000
CXUS51 KLWX 011633
CF6IAD
PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6)

                                          STATION:   WASHINGTON DULLES DC
                                          MONTH:     APRIL
                                          YEAR:      2009
                                          LATITUDE:   38 57 N
                                          LONGITUDE:  77 27 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  57  45  51   2  14   0 0.03  0.0    0  5.6 14 120   M    M  10 1      17 170
 2  59  50  55   6  10   0 0.08  0.0    0  6.6 15  90   M    M  10 128    24 120
 3  71  54  63  14   2   0 0.63  0.0    0 14.5 33 280   M    M   8 13     43 280
 4  64  45  55   5  10   0 0.00  0.0    0 17.2 29 280   M    M   1        39 270
 5  72  44  58   8   7   0 0.00  0.0    0  6.3 14 140   M    M   3        21 290
 6  64  41  53   3  12   0 0.06  0.0    0 11.5 29 310   M    M   9 1      37 310
 7  46  37  42  -8  23   0 0.00  0.0    0 13.6 25 280   M    M   8        33 290
 8  57  32  45  -6  20   0 0.00  0.0    0  8.8 23 210   M    M   7        28 200
 9  64  31  48  -3  17   0 0.00  0.0    0  2.9 16 230   M    M   3        30  20
10  74  41  58   7   7   0 0.00  0.0    0  6.8 24 220   M    M   7         M  M
11  61  46  54   2  11   0 0.74  0.0    0  9.5 21 350   M    M   8 18     25 360
12  57  34  46  -6  19   0 0.00  0.0    0  9.3 22 300   M    M   0        30 310
13  56  32  44  -8  21   0    T  0.0    0  4.3 12 150   M    M   7        17 140
14  51  46  49  -4  16   0 0.02  0.0    0  7.5 14  30   M    M  10 1      16  20
15  49  43  46  -7  19   0 0.57  0.0    0  9.5 23  20   M    M  10 1      28  20
16  66  38  52  -1  13   0 0.00  0.0    0  4.9 14 350   M    M   2        18 320
17  74  36  55   1  10   0 0.00  0.0    0  3.6 13 320   M    M   1 8      20 320
18  79  44  62   8   3   0 0.00  0.0    0  4.5 14 320   M    M   3        21 280
19  76  46  61   7   4   0 0.01  0.0    0  6.2 21 100   M    M   8        29 110
20  60  49  55   1  10   0 1.63  0.0    0  8.0 17 310   M    M  10 13     25 360
21  69  43  56   1   9   0 0.02  0.0    0  4.5 22 250   M    M   7 1238   29 240
22  60  39  50  -5  15   0    T  0.0    0  7.9 28 280   M    M   8 1      37 260
23  64  40  52  -3  13   0 0.00  0.0    0  9.5 24 280   M    M   2        32 290
24  80  36  58   2   7   0 0.00  0.0    0  6.2 17 200   M    M   2        22 150
25  92  51  72  16   0   7 0.01  0.0    0  4.2 26 230   M    M   7 3      38 230
26  92  57  75  19   0  10 0.00  0.0    0  5.1 15 320   M    M   3 8      18 200
27  92  63  78  21   0  13 0.00  0.0    0 10.2 21 200   M    M   2        30 200
28  87  62  75  18   0  10 0.00  0.0    0  9.9 18 200   M    M   4        26 210
29  70  50  60   3   5   0 0.31  0.0    0  9.1 16  40   M    M  10 1      21  10
30  61  50  56  -2   9   0 0.01  0.0    0  5.8 14 190   M    M   M        20 310
================================================================================
SM 2024 1325       306  40  4.12     0.0 233.5          M      170
================================================================================
AV 67.5 44.2                               7.8 FASTST   M    M   6    MAX(MPH)
                                 MISC ---->  # 33 280               # 43  280
================================================================================
NOTES:
# LAST OF SEVERAL OCCURRENCES

COLUMN 17 PEAK WIND IN M.P.H.

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

                                          STATION:  WASHINGTON DULLES DC
                                          MONTH:    APRIL
                                          YEAR:     2009
                                          LATITUDE:   38 57 N
                                          LONGITUDE:  77 27 W

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

AVERAGE MONTHLY: 55.8   TOTAL FOR MONTH:   4.12    1 = FOG OR MIST
DPTR FM NORMAL:   2.7   DPTR FM NORMAL:    0.90    2 = FOG REDUCING VISIBILITY
HIGHEST:    92 ON 27,26 GRTST 24HR  1.63 ON 20-20      TO 1/4 MILE OR LESS
LOWEST:     31 ON  9                               3 = THUNDER
                        SNOW, ICE PELLETS, HAIL    4 = ICE PELLETS
                        TOTAL MONTH:   0.0 INCH    5 = HAIL
                        GRTST 24HR     0.0         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:  13
MAX 90 OR ABOVE:   3    0.10 INCH OR MORE:   5
MIN 32 OR BELOW:   3    0.50 INCH OR MORE:   4
MIN  0 OR BELOW:   0    1.00 INCH OR MORE:   1

[HDD (BASE 65) ]
TOTAL THIS MO.   306    CLEAR  (SCALE 0-3)  10
DPTR FM NORMAL   -56    PTCLDY (SCALE 4-7)   9
TOTAL FM JUL 1  4575    CLOUDY (SCALE 8-10) 10
DPTR FM NORMAL  -217

[CDD (BASE 65) ]
TOTAL THIS MO.    40
DPTR FM NORMAL    29    [PRESSURE DATA]
TOTAL FM JAN 1    42    HIGHEST SLP M ON M
DPTR FM NORMAL    27    LOWEST  SLP 29.16 ON  3

[REMARKS]
#FINAL-04-09#