Saturday, March 13, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, MARCH 13, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0559E
SUNSET: 1749E
PLENTY OF SUNSHINE, BUT MUCH COOLER WITH A BRISK WIND….
The taste of spring came to an end last night with the
passage of a cold front. Strong cold air advection was
accompanied by strong wind gusts which peaked officially
at 53 mph. However a couple of our instruments did record
59 and 60 mph gusts!
Temperature really dropped markedly overnight with a
reading at midnight of 42 degrees slid to 27 degrees by the
7 A.M. observation.
Visibility has been outstanding again today at 85-90 miles.
Dry conditions continue to be the theme. No measurable
precipitation since back on the 1st of the month. The monthly
total stands at 0.13″, which is 1.93″ below normal. The yearly
total is 8.13″ which is 2.35″ below normal to date.
The high so far today is 44F, which is 1 degree above the
normal high of 43F. The low since midnight is 27F, which
is 1 degree above the daily normal low of 26F.
Today’s Observations:
7 A.M.
Weather: Thin scattered cirrus, few stratocumulus distant NW-N
and distant NE-E
Temperature: 27F; Dew Point: 10F; Relative Humidity: 49%
Wind: NW @ 15G24 kts, peak wind NW 38 mph at 6:03 A.M.
Sea-level pressure: 30.12 in Hg; rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 38F
6-hr Min temp: 27F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 300 -SCT 80 199/27/10/3115G24/012/ FEW SC DSNT NW-N
AND DSNT NE-E PK WND 3133/03/ 8/501 51043 10038 20027
10 A.M.
Weather: Clear, few stratocumulus distant E, few cirrus
distant ESE-S-SW
Temperature: 36F; Dew Point: 12F; Relative Humidity: 37%
Wind: NW @ 14G21 kts, peak wind NW 30 mph at 8:58 A.M.
Sea-level pressure: 30.16 in Hg; rising, then more slowly
Visibility: 85 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 CLR 85 213/36/12/3214G21/016/ FEW SC DSNT E
FEW CI DSNT ESE-S-SW PK WND 3226/58/ 8/501 51014
1 P.M.
Weather: Clear, few cirrus distant all quadrants
Temperature: 43F, Dew point: 10F; Relative Humidity: 25%
Wind: W @ 15G21 kts
Sea-level pressure: 30.12 in Hg; falling, then more rapidly
Visibility: 90 miles
6-hr Max temp: 44F
6-hr Min temp: 27F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 CLR 90 201/43/10/2815G21/012/ FEW CI DSNT ALQDS/
8/001 58012 10044 20027
SUMMARY FOR FRIDAY, MARCH 12, 2021
TEMPERATURE (DEGREES F)
MAX…….62 NORMAL…..43
MIN…….42 NORMAL…..25
MEAN……52 NORMAL…..34
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….+18
TOTAL DEPARTURE FOR THE MONTH……………….+18 [+1.3 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………13 DEPARTURE……-18
TOTAL HEATING UNITS FOR THE MONTH…………..372 DEPARTURE……-18
TOTAL HEATING UNITS FOR THE SEASON…………4417 DEPARTURE…..-541
TOTAL HEATING UNITS LAST SEASON TO DATE…….4402 DEPARTURE……+15
PEAK WIND GUST (MPH):
420C/Official…………..52 WNW @ 10:58 P.M.
AEROVANE (south tower)…..59 WNW @ 10:58 P.M.
ASOS…………………..53 W @ 10:59 P.M.
DAVIS #1……………….56 WNW @ 10:58 P.M.
DAVIS #2 (south tower)…..54 W @ 10:23 P.M.
RMY……………………57 @ 10:58 P.M.
VECTOR…………………60 @ 10:58 P.M.
MERLIN…………………53
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………40 WNW @ 10:58 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….38 WNW @ 11:00 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………41 WNW @ 11:00 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………41 WNW @ 11:00 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..35 WNW @ 10:57 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..39 @ 10:58 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……17.8 W [427 total miles] ASOS…………………17.7
DAVIS #1……………..17.9 W
DAVIS #2……………..18.2 W
RMY………………….16.3 W
VECTOR……………….17.3
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE….-0.16
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….0.13 DEPARTURE….-1.93
ASOS………….0.16
TOTAL PRECIPITATION FOR THE YEAR…………..8.13 DEPARTURE….-2.35
ASOS…………8.42
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M……… 0.0 DEPARTURE…. -0.5
TOTAL SNOWFALL FOR THE MONTH……………… 0.1 DEPARTURE…. -5.9
TOTAL SNOWFALL FOR THE SEASON……………..72.5 DEPARTURE….+20.0
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 The low since midnight is 27F, 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 13
HIGH 72 IN 1990
LOW -1 IN 1885
PRECIP 2.47 INS. IN 1993
SNOWFALL 23.0 INS. IN 2018 [RECORD FOR MONTH]PEAK GUST 76 MPH ENE IN 1993 [THE “STORM OF THE CENTURY”]
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
TODAY’S REPORT PREPARED BY: Matt Douglas
