Friday, April 2, 2021

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

FRIDAY, APRIL 2, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0524E
SUNSET:  1811E

MIX OF SUN AND CLOUDS, UNSEASONABLY CHILLY…

Yesterday’s storm produced 1.20 inches of much needed
precipitation. However, the annual deficit still remains
in the red at -3.10 inches. As the low-pressure exited
in the afternoon, a brief period of sleet passed through.
This served as a good forecast for today as we are seeing
well below average temperatures and cold air aloft yielding
considerable diurnal cloudiness. Not ideal weather for
spectators at Opening Day at Fenway Park, but at least
it is dry and an improvement from yesterday!

Winds have relaxed since yesterday’s peak of 44 MPH. We
are seeing an average of about 10 MPH thus far.

The high today so far today is 37F, this is 13 degrees below
the normal high of 50F. The low since midnight is 24F, which
is 9 degrees below the daily normal low of 33F.

Today’s Observations:
7 A.M.
Weather: Scattered Stratocumulus, Scattered Altocumulus/Altostratus
(virga distant W-NNW)
Temperature: 26F; Dew Point: 12F; Relative Humidity: 56%
Wind: NW @ 12G21 kts
Sea-level pressure: 30.06 in Hg, falling, than falling more slowly
Visibility: 40 miles (25 miles W-NNW)
6-hr Max temp: 30F
6-hr Min temp: 24F
24-hr Precip: 0.06 ins.
24-hr Snow: Trace
Snow Depth: 0 ins.
BHO SA 1155 41 SCT 90 SCT 40 180/26/12/3212G21/006/ VIRGA DSNT W-NNW
VSBY 25 W-NNW NEW SNW PST 24 HRS TRACE/ 8/530 51028 70006 10030 20024

10 A.M.
Weather: Scattered Stratocumulus
Temperature: 31F; Dew Point: 15F; Relative Humidity: 51%
Wind: WNW @ 9G17 kts
Sea-level pressure: 30.10 in Hg; rising, then falling
Visibility: 75 miles
3-hr Precip: 0.00 ins
3-hr Snow: 0.0 ins.
BHO SA 1455 45 SCT 75 189/31/15/2909G17/010/ 50009

1 P.M.
Weather: Broken Stratocumulus
Temperature: 35F, Dew point: 13F; Relative Humidity: 40%
Wind: W @ 11G17 kts
Sea-level pressure: 30.08 in Hg; falling, steadily
Visibility: 70 miles, hazy
6-hr Max temp: 37F
6-hr Min temp: 26F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 E50 BKN 65 186/35/13/2811G17/008/ HAZY/ 8/500 57003 10037 20026

SUMMARY FOR THURSDAY, APRIL 1, 2021

TEMPERATURE (DEGREES F)
MAX…….56     NORMAL…..50
MIN…….30     NORMAL…..32
MEAN……43     NORMAL…..41

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….+2
TOTAL DEPARTURE FOR THE MONTH……………….+2 [+1.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………22  DEPARTURE…….-2
TOTAL HEATING UNITS FOR THE MONTH……………22  DEPARTURE…….-2
TOTAL HEATING UNITS FOR THE SEASON…………4844  DEPARTURE…..-664
TOTAL HEATING UNITS LAST SEASON TO DATE…….4903  DEPARTURE……-59

PEAK WIND GUST (MPH):
                     420C/Official…………..44 NW  @  6:30 A.M.
                     AEROVANE (south tower)…..51 NW  @  6:30 A.M.
                     ASOS…………………..44 NW  @  6:30 A.M.
                     DAVIS #1……………….44 NW  @  7:00 A.M.
                     DAVIS #2 (south tower)…..44 NW  @  6:30 A.M.
                     RMY……………………49     @  7:00 A.M.
                     VECTOR…………………50     @  6:30 A.M.
                     MERLIN…………………51

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………32 NW  @  7:01 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….31 NW  @  7:07 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………32 NNW @  6:30 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………32 NW  @  7:00 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..30 NNW @  7:05 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..31     @  7:05 A.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL……14.7 NW [352 total miles]                     ASOS…………………14.3  
                     DAVIS #1……………..14.5 NW  
                     DAVIS #2……………..14.6 NNW
                     RMY………………….13.8 NNW
                     VECTOR……………….14.4

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.06  DEPARTURE….-0.11
                             ASOS………….0.05
TOTAL PRECIPITATION FOR THE MONTH (MARCH)…..0.89  DEPARTURE….+0.72
                             ASOS………….0.87
TOTAL PRECIPITATION FOR THE YEAR………….11.06  DEPARTURE….-3.10
                              ASOS………..11.38

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………TRACE  DEPARTURE…. -0.2
TOTAL SNOWFALL FOR THE MONTH (MARCH)………. 0.2  DEPARTURE…..-0.2
TOTAL SNOWFALL FOR THE SEASON……………..72.6  DEPARTURE….+13.2

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/-7/0.00/0.0/549/80      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/-8/0.00/0.0/686/99      21 NW   AERO 22 NW   RMY 23
03/08   38/19/29/-4/T/T/389/56           20 NW   AERO 20 NW   RMY 21
03/09   56/30/43/+10/T/T/…/..          32 WNW  AERO 35 WNW  RMY 37
03/10   54/32/43/+10/0.00/0.0/…/..     29 SSW  AERO 29 SSW  RMY 31
03/11   71/35/53/+19/0.00/0.0/…/..     41 SSW  AERO 43 SSW  RMY 46
03/12   62/42/52/+18/0.00/0.0/…/..     52 WNW  AERO 59 WNW  RMY 57
03/13   46/27/37/+3/0.00/0.0/…/..      53 WNW  AERO 59 WNW  RMY 57
03/14   45/19/32/-3/0.01/0.1/…/..      51 WNW  AERO 58 NW   RMY 58
03/15   27/12/20/-15/0.00/0.0/…/..     48 NW   AERO 47 NW   RMY 54
03/16   37/13/25/-10/0.00/0.0/…/..     22 NNW  AERO 22 NNW  RMY 23
03/17   52/27/40/+4/0.00/0.0/…/..      28 S    AERO 25 S    RMY 29
03/18   46/34/40/+4/0.80/T/…/..        38 NE   AERO 40 NE   RMY 42
03/19   39/26/33/-3/T/T/…/..           37 N    AERO 38 N    RMY 41
03/20   58/24/41/+4/0.00/0.0/…/..      23 W    AERO 23 W    RMY 27
03/21   62/39/51/+14/0.00/0.0/…/..     22 S    AERO 23 S    RMY 25
03/22   62/36/49/+12/0.00/0.0/…/..     21 S    AERO 18 S    RMY 22
03/23   65/38/52/+14/0.00/0.0/…/..     22 ESE  AERO 18 SE   RMY 21
03/24   63/44/54/+16/0.01/0.0/…/..     22 SSE  AERO 21 SSE  RMY 21
03/25   67/49/58/+20/0.10/0.0/…/..     25 S    AERO 26 S    RMY 26
03/26   63/48/56/+17/0.01/0.0/…/..     58 W    AERO 67 W    RMY 63
03/27   63/40/52/+13/0.00/0.0/…/..     39 WNW  AERO 41 WNW  RMY 44
03/28   56/37/47/+8/0.80/0.0/…/..      40 S    AERO 41 S    RMY 46
03/29   50/35/43/+3/T/0.0/…/..         58 WNW  AERO 62 WNW  RMY 63
03/30   58/31/45/+5/0.00/0.0/…/..      36 S    AERO 36 S    RMY 37
03/31   66/43/55/+14/0.31/0.0/…/..     41 SSW  AERO 45 S    RMY 44

04/01   56/30/43/+2/…/T/…/..         44 NW   AERO 51 NW   RMY 49
04/02   The low since midnight is 24F, the daily normal low is 33F

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

RECORDS FOR APRIL 2
HIGH 77 IN 1967
LOW 14 IN 1919
PRECIP 1.83 IN. IN 1970
SNOWFALL 6.5 IN. IN 1924
PEAK GUST 76 MPH SSW IN 1970

RECORDS FOR APRIL 3
HIGH 76 IN 1892
LOW 16 IN 1894
PRECIP 2.18 IN. IN 1990
SNOWFALL 8.0 IN. IN 1915
PEAK GUST 83e MPH NW IN 1977 [RECORD FOR MONTH]

TODAY’S REPORT PREPARED BY: Andrew Swanson