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

SUNDAY, MARCH 14, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0557E
SUNSET:  1750E

ARCTIC FRONT APPROACHING, LOTS OF CLOUDS AND GUSTY WINDS....

Before we get into the weather, a quick reminder that here
at Blue Hill Observatory, we do not switch to Daylight
Saving Time, as such, all times referenced within our daily
discussions will be in Eastern Standard Time (EST).

Today started off with plenty of sunshine, however, as an
arctic front approaches, convective clouds have developed
and overtaken the sky. A lot of virga is also being observed
early this afternoon as well as some brief flurries just
after 1:30 P.M.

While the temperature isn't dropping yet, the dew point has
begun to fall from the upper teens this morning to the mid
teens early this afternoon.

Winds have markedly increased since late this morning, with
frequents gusts now over 30 mph. A peak gust so far of 39 mph
has been recorded.

The dry stretch continues to lengthen as we haven't recorded
any measurable precipitation since back on the 1st of the
month. The monthly total stands at 0.13", which is 2.10"
below normal. The yearly total is 8.13" which is 2.52" below
normal to date.

The high so far today is 45F, which is 1 degree above the
normal high of 44F. The low since midnight is 30F, which
is 4 degrees above the daily normal low of 26F.


Today's Observations:

7 A.M.
Weather: Clear, few stratocumulus distant all quadrants
Temperature: 33F; Dew Point: 18F; Relative Humidity: 54%
Wind: W @ 10 kts
Sea-level pressure: 29.91 in Hg; falling, then more rapidly
Visibility: 60 miles
6-hr Max temp: 34F
6-hr Min temp: 30F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 CLR 60 127/33/18/2710/991/ FEW SC DSNT ALQDS/
8/500 58006 10034 20030

10 A.M.
Weather: Scattered stratocumulus, virga distant NW-NNE
Temperature: 42F; Dew Point: 18F; Relative Humidity: 37%
Wind: WNW @ 14G24 kts
Sea-level pressure: 29.87 in Hg; falling, then more rapidly
Visibility: 70 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 55 SCT 70 114/42/18/2914G24/987/ VIRGA DSNT
NW-NNE/ 8/500 58013

1 P.M.
Weather: Broken cumulus, moderate cumulus all quadrants,
virga all quadrants
Temperature: 42F, Dew point: 15F; Relative Humidity: 33%
Wind: WNW @ 20G30 kts, peak wind WNW 39 mph at 12:38 P.M.
Sea-level pressure: 29.78 in Hg; falling, then more rapidly
Visibility: 70 miles, 30 miles NW
6-hr Max temp: 45F
6-hr Min temp: 30F
6-hr Precip: Trace
6-hr Snow: Trace
Snow Depth: 0 ins.
BHO SA 1755 50 BKN 70 084/42/15/2920G30/978/ MDT CU ALQDS VIRGA ALQDS
VSBY 30 NW SW-B37E40 PK WND 2834/38/ 8/200 58030 6000/ 10045 20033


SUMMARY FOR SATURDAY, MARCH 13, 2021

TEMPERATURE (DEGREES F)
MAX.......46     NORMAL.....43
MIN.......27     NORMAL.....25
MEAN......37     NORMAL.....34

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL....... +3
TOTAL DEPARTURE FOR THE MONTH...................+21 [+1.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............28  DEPARTURE...... -3
TOTAL HEATING UNITS FOR THE MONTH..............400  DEPARTURE......-21
TOTAL HEATING UNITS FOR THE SEASON............4445  DEPARTURE.....-543
TOTAL HEATING UNITS LAST SEASON TO DATE.......4418  DEPARTURE......+27

PEAK WIND GUST (MPH):
                     420C/Official..............53 WNW @  1:21 A.M.
                     AEROVANE (south tower).....59 WNW @  1:20 A.M.
                     ASOS.......................54 WNW @ 12:36 A.M.
                     DAVIS #1...................54 W   @ 12:52 A.M.
                     DAVIS #2 (south tower).....53 WNW @  1:21 A.M.
                     RMY........................57     @ 12:54 A.M.
                     VECTOR.....................59     @  1:25 A.M.
                     MERLIN.....................N/A    

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL..................40 WNW @ 12:36 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................37 W   @ 12:36 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............40 W   @ 12:36 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............40 W   @ 12:36 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE....................34 WNW @ 12:33 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE.................37     @ 12:34 A.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL......18.0 WNW [432 total miles]
                     ASOS.....................16.7    
                     DAVIS #1.................18.1 WNW  
                     DAVIS #2.................18.2 WNW
                     RMY......................16.4 WNW
                     VECTOR...................17.3

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.............0.13  DEPARTURE....-2.10
                             ASOS.............0.16
TOTAL PRECIPITATION FOR THE YEAR..............8.13  DEPARTURE....-2.52
                              ASOS............8.42

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M.........  0.0  DEPARTURE.... -0.4
TOTAL SNOWFALL FOR THE MONTH.................. 0.1  DEPARTURE.... -6.3
TOTAL SNOWFALL FOR THE SEASON.................72.5  DEPARTURE....+19.6


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/.../..        69 WNW  AERO 78 WNW  RMY 78
03/02   27/10/19/-12/T/0.1/.../..        63 WNW  AERO 71 WNW  RMY 69
03/03   45/19/32/0/0.00/0.0/.../..       30 W    AERO 30 W    RMY 34
03/04   38/22/30/-2/0.00/0.0/.../..      46 NW   AERO 51 NW   RMY 53
03/05   31/18/25/-7/0.00/0.0/.../..      39 WNW  AERO 44 NW   RMY 45
03/06   33/15/24/-8/0.00/0.0/.../..      28 WNW  AERO 29 WNW  RMY 30
03/07   35/15/25/-8/0.00/0.0/.../..      21 NW   AERO 22 NW   RMY 23
03/08   38/19/29/-4/T/T/.../..           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 The low since midnight is 30F, the daily normal low is 26F


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

RECORDS FOR MARCH 14
HIGH 74 IN 1946
LOW 7 IN 1896
PRECIP 4.95 INS. IN 2010
SNOWFALL 7.3 INS. IN 2017
PEAK GUST 67 MPH ENE IN 2010

RECORDS FOR MARCH 15
HIGH 80 IN 1990
LOW 6 IN 1993
PRE 2.86 INS. IN 2010  
SNOW 12.0 INS. 1967
WIND 73e MPH ESE IN 1940

TODAY'S REPORT PREPARED BY: Matt Douglas