Sunday, May 2, 2021

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

SUNDAY, MAY 2, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0438E
SUNSET:  1845E

BREEZY AND WARM WITH INTERMITTENT SUNSHINE
ATOP GREAT BLUE HILL….

We observed mostly cloudy conditions with intermittent
sunshine. Visibility was 65 miles on average, with a
max visibility of 70 miles being seen at the 7 A.M.
observation. Pressure has been steadily falling in
conjunction with an increase of cloud cover. Sky
cover is almost overcast at this point in time.

Wind has been a notable feature today, with a max
gust of 35 mph being seen so far. Wind speed is
above 20 mph with frequent gusts of almost 30 mph.

Despite mostly cloudy conditions and a cool westerly
wind, today is above normal in the temperature
department.  

The high so far today is 73F, this is 11 degrees above the
normal high of 62F. The low since midnight is 48F, which
is 4 degrees above the daily normal low of 44F.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, broken cirrostratus
Temperature: 53F; Dew Point: 36F; Relative Humidity: 51%
Wind: SSW at 15G23 kts
Sea-level pressure: 29.71 in Hg, falling unsteadily
Visibility: 70 miles
6-hr Max temp: 53F
6-hr Min temp: 48F
24-hr Precip: Trace
24-hr Snow: 0.0 ins.
Snow Depth: 0.0 ins.
BHO SA 1155 90 SCT 250 BKN 70 062/53/36/2115G23/971/ 8/056
56012 70000 10053 20048

10 A.M.
Weather: Scattered altostratus and broken cirrostratus
Temperature: 66F; Dew Point: 36F; Relative Humidity: 32%
Wind: WSW @ 12G18 kts
Sea-level pressure: 29.68 in Hg; rising then falling
Visibility: 65 miles
3-hr Precip: 0.0 ins.
3-hr Snow: 0.00 ins.
BHO SA 1455 180 SCT 250 BKN 65 052/66/36/2412G18/968/ 8/016
55010

1 P.M.
Weather: Scattered altostratus and cirrostratus
Temperature: 71F, Dew point: 41F; Relative Humidity: 33%
Wind: W @ 16G28 kts, peak of 34 mph W at 12:04 P.M.
Sea-level pressure: 29.63 in Hg; falling unsteadily
Visibility: 65 miles
6-hr Max temp: 73F
6-hr Min temp: 53F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 160 SCT 250 BKN 65 036/71/41/2816G28/963/ PK
WND 2729/04/ 8/076 56016 10073 20053

SUMMARY FOR SATURDAY, MAY 1, 2021

TEMPERATURE (DEGREES F)
MAX…….62     NORMAL…..62
MIN…….38     NORMAL…..43
MEAN……50     NORMAL…..53

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……..-3
TOTAL DEPARTURE FOR THE MONTH………………..-3 [-3.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………15  DEPARTURE…….+3
TOTAL HEATING UNITS FOR THE MONTH……………15  DEPARTURE…….+2
TOTAL HEATING UNITS FOR THE SEASON…………5356  DEPARTURE…..-691
TOTAL HEATING UNITS LAST SEASON TO DATE…….5528  DEPARTURE…..-172

PEAK WIND GUST (MPH):
                     420C/Official…………..31 WNW @  1:02 P.M.
                     AEROVANE (south tower)…..35 WNW @  1:19 P.M.
                     ASOS…………………..35 NW  @  9:11 A.M.
                     DAVIS #1……………….35 NW  @  1:18 P.M.
                     DAVIS #2 (south tower)…..34 WNW @  8:50 A.M.
                     RMY……………………40     @  9:09 A.M.
                     VECTOR…………………38     @  1:19 P.M.
                     MERLIN…………………N/A

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………23 NW  @  3:58 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 NW  @  3:58 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………26 NW  @  3:58 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………25 WNW @  5:27 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..23 NW  @  3:25 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..24     @  3:24 P.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL……14.5 WNW [348 total miles]                     ASOS…………………13.5
                     DAVIS #1……………..14.8 WNW
                     DAVIS #2……………..15.3 WNW
                     RMY………………….13.4 WNW
                     VECTOR……………….14.3

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……TRACE  DEPARTURE….-0.12
                             ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….4.89  DEPARTURE….-0.06
                             ASOS………….4.77
TOTAL PRECIPITATION FOR THE YEAR………….15.12  DEPARTURE….-3.55
                              ASOS………..15.33

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/000/00        44 NW   AERO 51 NW   RMY 49
04/02   37/24/31/-10/0.00/0.0/614/80     28 NW   AERO 32 NNW  RMY 30
04/03   48/23/36/-6/0.00/0.0/755/98      24 NW   AERO 25 NW   RMY 26
04/04   58/33/46/+4/0.00/0.0/734/95      38 NNW  AERO 41 NNW  RMY 41
04/05   57/41/49/+6/T/T/031/04           41 NNW  AERO 48 NNW  RMY 50
04/06   61/40/51/+8/0.00/0.0/412/53      26 NNW  AERO 25 NNW  RMY 31
04/07   57/41/49/+6/0.00/0.0/391/50      23 ENE  AERO 21 ENE  RMY 22
04/08   59/43/51/+7/0.00/0.0/745/95      22 ENE  AERO 22 ENE  RMY 24
04/09   69/42/56/+12/0.00/0.0/707/90     24 S    AERO  M   M  RMY 26
04/10   75/43/59/+14/0.00/0.0/576/73     26 SSW  AERO 28 SSW  RMY 30
04/11   53/40/47/+2/T/0.0/000/00         33 ENE  AERO 33 ENE  RMY 34
04/12   46/37/42/-3/0.05/0.0/000/00      36 ENE  AERO 37 ENE  RMY 41
04/13   56/37/47/+1/T/0.0/415/52         31 NE   AERO 30 NE   RMY 33
04/14   56/42/49/+3/0.00/0.0/729/91      22 ESE  AERO 23 ESE  RMY 22
04/15   51/37/44/-3/0.30/0.0/016/02      26 ESE  AERO 25 ESE  RMY 28
04/16   39/31/35/-12/2.22/3.6/000/00     48 NNW  AERO 58 NNW  RMY 58
04/17   45/34/40/-7/0.07/T/040/05        27 NNW  AERO 30 NNW  RMY 29
04/18   60/38/49/+1/0.00/0.0/666/82      28 NW   AERO 28 NW   RMY 31
04/19   66/44/55/+7/T/0.0/…/..         22 SSW  AERO 25 SSW  RMY 28
04/20   72/45/59/+10/0.00/0.0/…/..     38 SW   AERO 37 WSW  RMY 40
04/21   68/32/50/+1/0.48/*T/…/..       45 S    AERO 51 S    RMY 51 TSTM
04/22   44/28/36/-13/T/T/…/..          54 W    AERO 55 W    RMY 59
04/23   58/32/45/-5/0.00/0.0/…/..      47 W    AERO 48 W    RMY 52
04/24   70/44/57/+7/0.00/0.0/…/..      33 WNW  AERO 37 WNW  RMY 55
04/25   54/44/49/-1/0.20/0.0/…/..      23 NNE  AERO 20 SSW  RMY 24
04/26   55/40/48/-3/0.00/0.0/…/..      39 NW   AERO 40 NW   RMY 43
04/27   67/38/53/+2/T/0.0/…/..         26 W    AERO 28 WNW  RMY 28
04/28   63/46/55/+3/…./…/…/..      18 ENE  AERO 21 WNW  RMY 20
04/29   54/44/48/-4/…./…/…/..      18 ENE  AERO 20 NNE  RMY 19
04/30   62/41/52/0/…./…/…/..       58 WNW  AERO 60 WNW  RMY 65

*Trace of frozen on 04/21 was hail, 1/8″ diameter, this does not
count as snowfall.

PRELIMINARY CLIMATE SUMMARY FOR MAY 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

05/01   62/38/50/-3/0.06/0.0/…/..       31 WNW  AERO 35 WNW  RMY 40

05/02 The low since midnight is 48F, the daily normal low is 44F

 

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

RECORDS FOR MAY 2
HIGH 92F IN 2001
LOW 29F IN 1903
PRECIP 1.36 INCHES IN 2006
SNOWFALL TRACE IN 1920, 1941
PEAK GUST 58 MPH S IN 1983

RECORDS FOR MAY 3
HIGH 92F IN 2001
LOW 31F IN 1888
PRECIP 2.25 INS IN 1900
SNOWFALL TRACE IN 1908, 1985
PEAK GUST 71 MPH W IN 2002

TODAY’S REPORT PREPARED BY: Benjamin Turner