Tuesday, March 16, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, MARCH 16, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0554E
SUNSET: 1752E
VERY COLD START, BUT A GRADUAL MODERATION OF TEMPS WITH
LIGHT WINDS….
The arctic air mass that moved through the region the last
36 hours or so is gradually releasing it’s grip. While
dew points continue to be very low (single digits), the
temperature today has rebounded compared to yesterday
reaching the mid 30s by early this afternoon under filtered
sunshine.
The wind has been very light today, which is a considerable
change from the past 3 days. Average wind speed since 7 A.M.
has only been around 3 mph!
The other big story of this month is the continuing dry
conditions. The monthly total stands at 0.14″, which is
2.45″ below normal. The yearly total is 8.14″ which is 2.87″
below normal to date. Perhaps we’ll be able to put a little
dent into the deficit late in the week.
The high so far today is 35F, which is 9 degrees below the
normal high of 44F. The low since midnight is 13F, which
is 13 degrees below the daily normal low of 26F.
Today’s Observations:
7 A.M.
Weather: Thin broken cirrus, few stratocumulus offshore
distant ENE-S, few altocumulus distant SW-W
Temperature: 16F; Dew Point: -1F; Relative Humidity: 47%
Wind: NW @ 7 kts
Sea-level pressure: 30.34 in Hg; rising, then falling
Visibility: 70 miles
6-hr Max temp: 16F
6-hr Min temp: 13F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 E250 -BKN 70 273/16/-1/3207/034/ FEW SC OFFSHR
DSNT ENE-SE FEW AC DSNT SW-W/ 8/531 50004 10016 20013
10 A.M.
Weather: Scattered cirrus, thin broken cirrus, few
altostratus distant SSW-W
Temperature: 24F; Dew Point: -1F; Relative Humidity: 34%
Wind: NNW @ 3 kts, wind light and variable
Sea-level pressure: 30.31 in Hg; falling, then more rapidly
Visibility: 65 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 200 SCT E250 -BKN 65 264/24/-1/3303/031/
FEW AC DSNT SSW-W WND L/V/ 8/031 58009
1 P.M.
Weather: Scattered altocumulus/altostratus, thin broken cirrus
Temperature: 34F, Dew point: 2F; Relative Humidity: 25%
Wind: SW @ 4 kts, wind light and variable
Sea-level pressure: 30.25 in Hg; falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 35F
6-hr Min temp: 16F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 140 SCT E250 -BKN 70 245/34/2/2204/025/
WND L/V/ 8/051 58019 10035 20016
SUMMARY FOR MONDAY, MARCH 15, 2021
TEMPERATURE (DEGREES F)
MAX…….27 NORMAL…..44
MIN…….12 NORMAL…..26
MEAN……20 NORMAL…..35
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….-15
TOTAL DEPARTURE FOR THE MONTH………………. +3 [+0.0 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………45 DEPARTURE……+15
TOTAL HEATING UNITS FOR THE MONTH…………..478 DEPARTURE…… -3
TOTAL HEATING UNITS FOR THE SEASON…………4523 DEPARTURE…..-526
TOTAL HEATING UNITS LAST SEASON TO DATE…….4467 DEPARTURE……+56
PEAK WIND GUST (MPH):
420C/Official…………..48 NW @ 1:53 A.M.
AEROVANE (south tower)…..47 NW @ 1:53 A.M.
ASOS…………………..47 NW @ 1:56 A.M.
DAVIS #1……………….45 NW @ 1:54 A.M.
DAVIS #2 (south tower)…..N/A
RMY……………………54 @ 1:54 A.M.
VECTOR…………………55 @ 1:56 A.M.
MERLIN…………………N/A
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………33 NW @ 1:57 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….30 NW @ 1:54 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………32 NW @ 1:54 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………N/A
MAXIMUM 2-MINUTE RMY AVERAGE………………..30 NNW @ 1:52 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..31 @ 1:52 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……18.5 NW [444 total miles] ASOS…………………16.9
DAVIS #1……………..18.3 NNW
DAVIS #2……………..N/A
RMY………………….17.1 NNW
VECTOR……………….17.8
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE….-0.18
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….0.14 DEPARTURE….-2.45
ASOS………….0.17
TOTAL PRECIPITATION FOR THE YEAR…………..8.14 DEPARTURE….-2.87
ASOS…………8.43
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M……… 0.0 DEPARTURE…. -0.4
TOTAL SNOWFALL FOR THE MONTH……………… 0.2 DEPARTURE…. -7.0
TOTAL SNOWFALL FOR THE SEASON……………..72.6 DEPARTURE….+18.9
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 The low since midnight is 13F, 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 16
HIGH 73 IN 1990
LOW 8 IN 1932
PRE 1.95 INS. IN 1900
SNOW 10.0 INS. IN 1896
WIND 79 MPH NE IN 1956
RECORDS FOR MARCH 17
HIGH 69 IN 2003
LOW 6 IN 1885
PRECIP 1.97 INS. IN 1968
SNOWFALL 6.5 INS. IN 1956
PEAK GUST 70 MPH SSW IN 1973
TODAY’S REPORT PREPARED BY: Matt Douglas
