Monday, April 5, 2021

| April 6, 2021 | Reply

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

MONDAY, APRIL 5, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0519E
SUNSET:  1815E

LOTS OF CLOUDS AND WINDY CONDITIONS AT BLUE HILL….

An ocean storm south of Nova Scotia has been retrograding a
bit sending a spoke of clouds and even a few flurries and
sprinkles to the area this morning into early this afternoon.

A gusty northwest wind has also been blowing across the
summit as the pressure gradient between the low to the
east and high pressure to the west increases. Gusts exceeding
40 mph have been observed. The average speed since 7 A.M.
has been around 16 mph.

Despite the clouds and occasional flurry/sprinkle, visibility
has been spectacular hanging at around 70 to 80 miles all day!

The high today so far today is 54F, this is 3 degree above
the normal high of 51F. The low since midnight is 41F, which
is 7 degrees above the daily normal low of 34F.


PRELIMINARY STATS FOR MARCH 2021

TEMPERATURE, Deg. F
Avg. Max. 50.2 [+5.9]
Avg. Min. 29.1 [+2.5]
Mean      39.7 [+4.2]
24-hour corrected mean: 39.2
Max. for month: 71F on the 11th
Min. for month: 10F on the 2nd

HEATING DEGREE DAYS
Total heating units:    777 [-139]
Total for the season:  4822 [-662]
Total for last season: 5484

PRECIPITATION, Inches
Total: 2.17 [-3.41]
Greatest in 24 hrs: 0.80 ins. on the 18th and 28th

SNOWFALL, Inches
Total: 0.2 [-12.5]
Greatest in 24 hrs: 0.1 ins. on the 2nd and 14th

WIND, mph
Avg. uncorrected wind speed: 13.8 mph
Avg. corrected wind speed:   14.2 mph
Prevailing wind direction:   WNW [22%]
Peak gust and direction:     69 WNW on the 1st

SUNSHINE:
Campbell-Stokes card minutes: 14580 out of 21516 or 68%
Astronomical total minutes: 15099 out of 22265 or 68%


Today’s Observations:

7 A.M.
Weather: Broken altostratus, thin broken cirrus, few stratocumulus
distant ENE-ESE, virga N-E-SSE
Temperature: 44F; Dew Point: 15F; Relative Humidity: 30%
Wind: NNW @ 13G23 kts, peak wind NW 31 mph at 5:57 A.M.
Sea-level pressure: 29.82 in Hg, rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 44F
6-hr Min temp: 41F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 E65 BKN 250 -BKN 80 099/44/15/3313G23/982/
FEW SC DSNT ENE-ESE VIRGA N-E-SSE PK WND 3227/57/ 8/521
51012 10044 20041

10 A.M.
Weather: Broken altocumulus standing lenticularis,
broken altostratus, virga distant N-E-SE
Temperature: 48F; Dew Point: 18F; Relative Humidity: 29%
Wind: NW @ 16G30 kts, peak wind NW 35 mph at 9:46 A.M.
Sea-level pressure: 29.80 in Hg; steady, then falling
Visibility: 80 miles
3-hr Precip: Trace
3-hr Snow: Trace
BHO SA 1455 E45 BKN 120 BKN 80 092/48/18/3216G30/980/
VIRGA DSNT N-E-SE PK WND 3230/46/ TOTAL NEW SNW PST 3 HRS TRACE/
8/020 58007 6000/

1 P.M.
Weather: Broken altocumulus, broken cirrostratus
Temperature: 53F, Dew point: 15F; Relative Humidity: 21%
Wind: NNW @ 18G30 kts, peak wind NNW 39 mph at 12:20 P.M.
Sea-level pressure: 29.75 in Hg; falling, then more slowly
Visibility: 70 miles
6-hr Max temp: 54F
6-hr Min temp: 43F
6-hr Precip: Trace
6-hr Snow: Trace
Snow Depth: 0 ins.
BHO SA 1755 E50 BKN 200 BKN 70 074/53/15/3318G30/975/
VIRGA N-E-SSE PK WND 3334/20/ TOTAL NEW SNW PST 6 HRS TRACE/
8/058 56018 6000/ 10054 20043


SUMMARY FOR SUNDAY, APRIL 4, 2021

TEMPERATURE (DEGREES F)
MAX…….58     NORMAL…..51
MIN…….33     NORMAL…..33
MEAN……46     NORMAL…..42

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…… +4
TOTAL DEPARTURE FOR THE MONTH………………-10 [-2.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………19  DEPARTURE…….-4
TOTAL HEATING UNITS FOR THE MONTH…………..104  DEPARTURE……+10
TOTAL HEATING UNITS FOR THE SEASON…………4926  DEPARTURE…..-652
TOTAL HEATING UNITS LAST SEASON TO DATE…….4976  DEPARTURE……-50

PEAK WIND GUST (MPH):
                     420C/Official…………..38 NNW @  9:47 P.M.
                     AEROVANE (south tower)…..41 NNW @  9:47 P.M.
                     ASOS…………………..35 NNW @  9:48 P.M.
                     DAVIS #1……………….37 NNW @  9:47 P.M.
                     DAVIS #2 (south tower)…..35 NW  @  9:38 P.M.
                     RMY……………………41     @  9:46 P.M.
                     VECTOR…………………42     @  9:48 P.M.
                     MERLIN…………………N/A

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………27 NNW @  9:48 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….26 NW  @  9:48 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………28 NNW @  9:48 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 NNW @  9:49 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..26 NNW @  9:45 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..28     @  9:46 P.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL…….11.5 NW [275 total miles]
                     ASOS………………….10.9  
                     DAVIS #1………………11.7 NW  
                     DAVIS #2………………11.6 NNW
                     RMY…………………..11.0 NNW
                     VECTOR………………..11.6

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00  DEPARTURE….-0.17
                             ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….0.89  DEPARTURE….+0.21
                             ASOS………….0.87
TOTAL PRECIPITATION FOR THE YEAR………….11.06  DEPARTURE….-3.61
                              ASOS………..11.38

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0  DEPARTURE…. -0.1
TOTAL SNOWFALL FOR THE MONTH …………….TRACE  DEPARTURE…..-0.8
TOTAL SNOWFALL FOR THE SEASON……………..72.6  DEPARTURE….+12.6


PRELIMINARY CLIMATE SUMMARY FOR MARCH CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

03/01   42/24/33/+2/0.13/T/020/03        69 WNW  AERO 78 WNW  RMY 78
03/02   27/10/19/-12/T/0.1/679/100       63 WNW  AERO 71 WNW  RMY 69
03/03   45/19/32/0/0.00/0.0/375/55       30 W    AERO 30 W    RMY 34
03/04   38/22/30/-2/0.00/0.0/520/76      46 NW   AERO 51 NW   RMY 53
03/05   31/18/25/-7/0.00/0.0/556/81      39 WNW  AERO 44 NW   RMY 45
03/06   33/15/24/-8/0.00/0.0/675/98      28 WNW  AERO 29 WNW  RMY 30
03/07   35/15/25/-8/0.00/0.0/679/98      21 NW   AERO 22 NW   RMY 23
03/08   38/19/29/-4/T/T/653/94           20 NW   AERO 20 NW   RMY 21
03/09   56/30/43/+10/T/T/628/90          32 WNW  AERO 35 WNW  RMY 37
03/10   54/32/43/+10/0.00/0.0/666/95     29 SSW  AERO 29 SSW  RMY 31
03/11   71/35/53/+19/0.00/0.0/218/31     41 SSW  AERO 43 SSW  RMY 46
03/12   62/42/52/+18/0.00/0.0/614/87     52 WNW  AERO 59 WNW  RMY 57
03/13   46/27/37/+3/0.00/0.0/696/98      53 WNW  AERO 59 WNW  RMY 57
03/14   45/19/32/-3/0.01/0.1/449/63      51 WNW  AERO 58 NW   RMY 58
03/15   27/12/20/-15/0.00/0.0/694/97     48 NW   AERO 47 NW   RMY 54
03/16   37/13/25/-10/0.00/0.0/352/49     22 NNW  AERO 22 NNW  RMY 23
03/17   52/27/40/+4/0.00/0.0/483/67      28 S    AERO 25 S    RMY 29
03/18   46/34/40/+4/0.80/T/000/00        38 NE   AERO 40 NE   RMY 42
03/19   39/26/33/-3/T/T/683/94           37 N    AERO 38 N    RMY 41
03/20   58/24/41/+4/0.00/0.0/701/96      23 W    AERO 23 W    RMY 27
03/21   62/39/51/+14/0.00/0.0/704/96     22 S    AERO 23 S    RMY 25
03/22   62/36/49/+12/0.00/0.0/698/95     21 S    AERO 18 S    RMY 22
03/23   65/38/52/+14/0.00/0.0/568/77     22 ESE  AERO 18 SE   RMY 21
03/24   63/44/54/+16/0.01/0.0/163/22     22 SSE  AERO 21 SSE  RMY 21
03/25   67/49/58/+20/0.10/0.0/201/27     25 S    AERO 26 S    RMY 26
03/26   63/48/56/+17/0.01/0.0/127/17     58 W    AERO 67 W    RMY 63
03/27   63/40/52/+13/0.00/0.0/608/81     39 WNW  AERO 41 WNW  RMY 44
03/28   56/37/47/+8/0.80/0.0/000/00      40 S    AERO 41 S    RMY 46
03/29   50/35/43/+3/T/0.0/718/95         58 WNW  AERO 62 WNW  RMY 63
03/30   58/31/45/+5/0.00/0.0/720/95      36 S    AERO 36 S    RMY 37
03/31   66/43/55/+14/0.31/0.0/251/33     41 SSW  AERO 45 S    RMY 44


PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

04/01   56/30/43/+2/0.89/T/…/..        44 NW   AERO 51 NW   RMY 49
04/02   37/24/31/-10/0.00/0.0/…/..     28 NW   AERO 32 NNW  RMY 30
04/03   48/23/36/-6/0.00/0.0/…/..      24 NW   AERO 25 NW   RMY 26
04/04   58/33/46/+4/0.00/0.0/…/..      38 NNW  AERO 41 NNW  RMY 41

04/05   The low since midnight is 41F, the daily normal low is 34F


DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR APRIL 5
HIGH 81 IN 1928
LOW 15 IN 1995
PRECIP 2.15 IN. IN 1987
SNOWFALL 4.0 IN. IN 1898
PEAK GUST 76 MPH WNW IN 1963

RECORDS FOR APRIL 6
HIGH 82 IN 1921
LOW 16 IN 1982
PRE 1.72 INS IN 1886
SNOW 12.3 INS IN 1982
WIND 71e MPH WNW IN 1940

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

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