Wednesday, March 17, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, MARCH 17, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0552E
SUNSET: 1753E
MUCH MILDER UNDER MAINLY SUNNY SKIES AND A LIGHT BREEZE….
A patch of clouds moved through early to mid morning, but
has since moved out leaving us with abundant sunshine into
this afternoon.
The arctic air mass is now gone and much milder air has
returned to the area. Temperatures have reached the upper
40s through early this afternoon.
The wind is once again on the light side today, just adding
to the “warmer” feel compared to the last couple of days.
The average speed since 7 A.M. is only around 8 mph.
The other big story of the month is the continuing dry
conditions. The monthly total stands at 0.14″, which is
2.63″ below normal. The yearly total is 8.14″ which is 3.05″
below normal to date. Perhaps we’ll be able to put a little
dent into the deficit tomorrow night into Friday.
The high so far today is 49F, which is 5 degrees above the
normal high of 44F. The low since midnight is 27F, which
is equal to the daily normal low of 27F.
Today’s Observations:
7 A.M.
Weather: Broken altocumulus/stratocumulus, thin broken cirrus,
thin smoke layer all quadrants
Temperature: 31F; Dew Point: 23F; Relative Humidity: 72%
Wind: WSW @ 8 kts
Sea-level pressure: 30.20 in Hg; rising, then more slowly
Visibility: 25 miles, hazy
6-hr Max temp: 31F
6-hr Min temp: 27F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 E95 BKN 250 -BKN 25 227/31/23/2408/020/
THN K LYR ALQDS HAZY/ 8/071 51010 10031 20027
10 A.M.
Weather: Scattered altocumulus/altostratus, few stratocumulus
distant SW-W, thin smoke layer all quadrants
Temperature: 39F; Dew Point: 29F; Relative Humidity: 66%
Wind: SW @ 7 kts
Sea-level pressure: 30.18 in Hg; falling, then more rapidly
Visibility: 30 miles, hazy
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 100 SCT 30 219/39/29/2307/018/ FEW SC DSNT SW-W
THN K LYR ALQDS HAZY/ 8/570 58008
1 P.M.
Weather: Clear, few stratocumulus all quadrants, few alto-
cumulus distant S-SW and distant NW
Temperature: 48F, Dew point: 31F; Relative Humidity: 51%
Wind: SW @ 8 kts
Sea-level pressure: 30.13 in Hg; falling, then more rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 49F
6-hr Min temp: 31F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 CLR 30 202/48/31/2308/013/ FEW SC ALQDS
FEW AC DSNT S-SW AND DSNT NW HAZY/ 8/570 58017 10049 20031
SUMMARY FOR TUESDAY, MARCH 16, 2021
TEMPERATURE (DEGREES F)
MAX…….37 NORMAL…..44
MIN…….13 NORMAL…..26
MEAN……25 NORMAL…..35
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….-10
TOTAL DEPARTURE FOR THE MONTH………………. -7 [-0.6 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………40 DEPARTURE……+10
TOTAL HEATING UNITS FOR THE MONTH…………..518 DEPARTURE…… +7
TOTAL HEATING UNITS FOR THE SEASON…………4563 DEPARTURE…..-516
TOTAL HEATING UNITS LAST SEASON TO DATE…….4503 DEPARTURE……+60
PEAK WIND GUST (MPH):
420C/Official…………..22 NNW @ 12:31 A.M.
AEROVANE (south tower)…..22 NNW @ 12:30 A.M.
ASOS…………………..22 NNW @ 12:30 A.M.
DAVIS #1……………….21 N @ 12:20 A.M.
DAVIS #2 (south tower)…..22 N @ 12:20 A.M.
RMY……………………23 @ 12:19 A.M.
VECTOR…………………23 @ 12:21 A.M.
MERLIN…………………N/A
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 S @ 5:45 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….16 S @ 5:45 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 NNW @ 12:22 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 S @ 5:45 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..16 SSW @ 5:42 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..16 @ 5:42 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…… 8.1 SSW [194 total miles] ASOS………………… 8.0
DAVIS #1…………….. 8.1 W
DAVIS #2…………….. 8.5 W
RMY…………………. 8.1 W
VECTOR………………. 8.6
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….-2.63
ASOS………….0.17
TOTAL PRECIPITATION FOR THE YEAR…………..8.14 DEPARTURE….-3.05
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…. -7.4
TOTAL SNOWFALL FOR THE SEASON……………..72.6 DEPARTURE….+18.5
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 The low since midnight is 27F, the daily normal low is 27F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
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
RECORDS FOR MARCH 18
HIGH 72 IN 2012
LOW 0 IN 1885
PRECIP 5.61 INS. IN 1968 [RECORD FOR MONTH]SNOWFALL 9.3 INS. IN 1985
PEAK GUST 71e MPH WNW IN 1941
TODAY’S REPORT PREPARED BY: Matt Douglas
