Saturday, February 27, 2021

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

SATURDAY, FEBRUARY 27, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0623E
SUNSET:  1732E

VERY WINDY WITH RAIN WITH SOME LIGHT SNOW THIS MORNING….

Pressure has dropped by almost 10 millibars since this
morning following a frontal passage yesterday. Before the
rain, we had some light snow this morning that amounted
to a 1/10th inch. The snow changed over around 8:30 A.M.,
and the mix left 0.07 inches of liquid in the gauge since
7 A.M. Wind is strengthening as the day goes on, with
frequent gusts of 30 mph since noon. The max gust as of
yet is 38 mph from the southeast.

Visibility has been poor considering the snow, rain and fog.
We saw a max visibility of 15 miles this morning, but it
decreased to a 1/2 mile by the 1 P.M. observation.

The high so far today is 41F, a degree above the daily
average max of 40F. The low since midnight is 28F,
6 degrees above the daily average low of 22F.

Today’s Observations:

7 A.M.
Weather: Light snow
Temperature: 31F; Dew Point: 29F; Relative Humidity: 90%
Wind: SSE @ 12 kts
Sea-level pressure: 30.38 in Hg; falling, then more rapidly
Visibility: 5 miles, fog
6-hr Max temp: 31F
6-hr Min temp: 29F
24-hr Precip: Trace
24-hr Snow: Trace
Snow Depth: 6 ins.
BHO SA 1155 40 OVC 5S-F 287/31/29/1512/038/ S-B35 NEW SNW
PST 24 HRS TRACE/ 8/6// 4/006 58016 10031 20029

10 A.M.
Weather: Light rain
Temperature: 33F; Dew Point: 31F; Relative Humidity: 92%
Wind: SE @ 12 kts
Sea-level pressure: 30.29 in Hg; falling, then more rapidly
Visibility: 15 miles, thin fog
3-hr Precip: 0.03 ins.
3-hr Snow: 0.1 ins.
BHO SA 1455 40 OVC 15R- 258/33/31/1312/029/ R-CTD THN F ALQDS
NEW SNW PST 3 HRS 0.1 INS/ 8/6// 6003/ 58029

1 P.M.
Weather: Light rain
Temperature: 40F, Dew point: 40F; Relative Humidity: 100%
Wind: SSE @ 16G29 kts, peak of 36 mph at 12:07 P.M.
Sea-level pressure: 30.06 in Hg; falling very rapidly
Visibility: 1/2 mile, fog
6-hr Max temp: 41F
6-hr Min temp: 31F
6-hr Precip: 0.07 ins.
6-hr Snow: 0.1 ins.
Snow Depth: 5 ins.
BHO SA 1755 X W3 1/2R-F 180/40/40/1516G29/006/ R-CTD PRESFR
NEW SNW PST 6 HRS 0.1 INS PK WND 1631/07/ 8//// 4/005 6007/
58078 10041 20031

SUMMARY FOR FRIDAY, FEBRUARY 26, 2021

TEMPERATURE (DEGREES F)
MAX…….40   NORMAL…..39
MIN…….22   NORMAL…..21
MEAN……31   NORMAL…..30

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……. +1
TOTAL DEPARTURE FOR THE MONTH……………….+21 [+0.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………34  DEPARTURE…… -1
TOTAL HEATING UNITS FOR THE MONTH…………..946  DEPARTURE……-22
TOTAL HEATING UNITS FOR THE SEASON…………3990  DEPARTURE…..-509
TOTAL HEATING UNITS LAST SEASON TO DATE…….4041  DEPARTURE……-51

PEAK WIND GUST (MPH):
420C/Official…………..22 WNW @ 11:27 A.M.
AEROVANE (south tower)…..22 WNW @ 12:22 P.M.
ASOS…………………..20 WNW @ 11:28 A.M.
DAVIS #1……………….20 WNW @  8:28 A.M.
DAVIS #2 (south tower)…..24 SSE @ 11:41 P.M.
RMY……………………21     @ 11:27 A.M.
VECTOR…………………22     @ 12:33 P.M.
MERLIN…………………27

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 W   @ 12:36 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….15 W   @ 12:36 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 W   @ 12:36 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 SSE @ 11:43 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..15 W   @ 12:33 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..15     @ 10:27 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……9.2  WNW  [220 total miles] ASOS…………………9.2
DAVIS #1……………..9.8  WNW
DAVIS #2……………..10.1 WNW
RMY………………….9.0  WNW
VECTOR……………….9.6

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………….5.46  DEPARTURE….+1.72
ASOS………….5.65
TOTAL PRECIPITATION FOR THE YEAR…………..7.78  DEPARTURE….-0.31
ASOS…………8.00

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0  DEPARTURE…. -0.4
TOTAL SNOWFALL FOR THE MONTH………………38.9  DEPARTURE….+26.0
TOTAL SNOWFALL FOR THE SEASON……………..72.3  DEPARTURE….+26.3

PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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

02/01   32/21/27/+1/1.86/12.7/000/00      53 NE   AERO 65 NE   RMY 62
02/02   34/29/32/+6/0.91/1.6/000/00       52 NNE  AERO 55 NE   RMY 58
02/03   34/26/30/+4/0.01/0.2/036/06       20 NW   AERO 20 NW   RMY 22
02/04   37/26/32/+6/0.02/0.7/158/26       23 NW   AERO 22 NW   RMY M
02/05   39/26/33/+7/0.01/T/000/00         33 S    AERO 32 S    RMY 30
02/06   40/28/34/+8/0.00/0.0/595/97       42 WSW  AERO 41 WSW  RMY 47
02/07   35/25/30/+3/0.71/11.6/000/00      27 WNW  AERO 28 WNW  RMY 30
02/08   27/13/20/-7/0.00/0.0/619/100      29 NW   AERO 31 WNW  RMY 32
02/09   27/18/23/-4/0.17/2.2/000/00       16 N    AERO 16 N    RMY 17
02/10   31/15/23/-4/0.00/0.0/…/..       26 WNW  AERO 25 WNW  RMY 28
02/11   31/15/23/-4/0.00/0.0/…/..       28 NW   AERO 26 NW   RMY 31
02/12   25/8/17/-10/0.00/0.0/…/..       32 NW   AERO 35 NW   RMY 36
02/13   27/15/21/-7/0.00/0.0/…/..       20 NNW  AERO 20 NNW  RMY 23
02/14   34/24/29/+1/0.00/0.0/…/..       19 ENE  AERO 16 ENE  RMY 19
02/15   31/27/29/+1/0.11/0.0/…/..       21 NNE  AERO 21 NNE  RMY 22
02/16   44/29/37/+9/0.63/0.0/…/..       39 W    AERO 41 W    RMY 43
02/17   30/19/25/-3/0.00/0.0/…/..       40 W    AERO 41 WNW  RMY 40
02/18   29/21/25/-4/0.13/1.7/…/..       24 ENE  AERO 24 ENE  RMY 25
02/19   30/24/27/-2/0.66/7.7/…/..       24 NE   AERO 23 NE   RMY 24
02/20   32/19/26/-3/0.02/0.5/…/..       32 NW   AERO 35 NW   RMY 38
02/21   33/15/24/-5/0.00/0.0/…/..       27 NW   AERO 28 NW   RMY 29
02/22   40/21/31/+2/0.22/T/…/..         41 S    AERO 41 SSE  RMY 44
02/23   43/31/37/+7/0.00/0.0/…/..       31 WNW  AERO 31 WNW  RMY 32
02/24   49/34/42/+12/0.00/0.0/…/..      39 SSW  AERO 39 SSW  RMY 42
02/25   43/28/30/+6/0.00/0.0/…/..       50 WNW  AERO 55 WNW  RMY 57
02/26   40/22/31/+1/0.00/0.0/…/..       22 WNW  AERO 22 WNW  RMY 21

02/27 The low since midnight is 9F, the daily normal low is 22F

DAILY RECORDS

02/01 -RECORD SNOWFALL OF 12.7 INS, BREAKING PREVIOUS RECORD
OF 11.0 INS SET IN 1898
02/01 -RECORD PRECIPITATION OF 1.86 INS, BREAKING PREVIOUS
RECORD OF 1.30 INS SET IN 1898

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

RECORDS FOR FEBRUARY 27
HIGH 61F IN 1976
LOW -8F IN 1900
PRECIP 1.43 INCHES IN 2013
SNOWFALL 6.0 INCHES IN 1922
PEAK GUST 67 MPH W IN 1985

RECORDS FOR FEBRUARY 28
HIGH 62F IN 1976
LOW -2F IN 1907,1934
PRECIP 1.79 INCHES IN 1958
SNOWFALL 8.5 INCHES IN 2005
PEAK GUST 88e MPH SSW IN 1943

TODAY’S REPORT PREPARED BY: Benjamin Turner