Thursday, February 18, 2021

| February 18, 2021 | Reply

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

THURSDAY, FEBRUARY 18, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0637E
SUNSET:  1720E

OVERCAST WITH SOME LIGHT SNOW STARTING IN THE
EARLY AFTERNOON….

Today we observed overcast skies with a decent visibility
of 65 miles at the 10 A.M. observation. Wind was on the
lighter side, moving from northwest to northeast as the
day went on. Shortly after 1 P.M., we had some light snow
begin, but has not accumulated much as of yet.

The high so far today is 29F, 8 degrees below the daily
average max of 37F. The low since midnight is 20F, the
same as the normal minimum.

Today’s Observations:

7 A.M.
Weather: Overcast altostratus
Temperature: 22F; Dew Point: 6F; Relative Humidity: 50%
Wind: N @ 7 kts
Sea-level pressure: 30.49 in Hg; falling then rising
Visibility: 35 miles, hazy
6-hr Max temp: 22F
6-hr Min temp: 20F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 9 ins.
BHO SA 1155 70 OVC 35 327/22/6/3507/049/ HAZY/ 8/02/ 4/009
50002 10022 20020

10 A.M.
Weather: Overcast altostratus
Temperature: 25F; Dew Point: 10F; Relative Humidity: 53%
Wind: ENE @ 4 kts, light and variable
Sea-level pressure: 30.47 in Hg; falling steadily
Visibility: 65 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 80 OVC 65 320/25/10/0604/047/ WND L/V/ 8/02/
58007

1 P.M.
Weather: Overcast altostratus
Temperature: 27F, Dew point: 12F; Relative Humidity: 53%
Wind: NNE @ 6 kts, wind light
Sea-level pressure: 30.40 in Hg, falling steadily
Visibility: 55 miles
6-hr Max temp: 29F
6-hr Min temp: 22F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 9 ins.
BHO SA 1755 80 OVC 55 298/27/12/0306/040/ WND LGT/ 4/009
8/02/ 58022 10029 20022

SUMMARY FOR WEDNESDAY, FEBRUARY 17, 2021

TEMPERATURE (DEGREES F)
MAX…….30   NORMAL…..37
MIN…….19   NORMAL…..19
MEAN……25   NORMAL…..28

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….. -3
TOTAL DEPARTURE FOR THE MONTH……………….. +7 [+0.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………40  DEPARTURE…….+3
TOTAL HEATING UNITS FOR THE MONTH…………..640  DEPARTURE…….-8
TOTAL HEATING UNITS FOR THE SEASON…………3684  DEPARTURE…..-494
TOTAL HEATING UNITS LAST SEASON TO DATE…….3779  DEPARTURE……-95

PEAK WIND GUST (MPH):
420C/Official…………..40 W   @ 12:46 A.M.
AEROVANE (south tower)…..41 WNW @  2:01 A.M.
ASOS…………………..40 W   @ 12:46 A.M.
DAVIS #1……………….41 W   @ 12:45 A.M.
DAVIS #2 (south tower)…..40 WNW @  2:03 A.M.
RMY……………………40     @ 12:00 A.M
VECTOR…………………45     @ 12:45 A.M.
MERLIN…………………N/A

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………29 W   @ 12:46 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….29 W   @ 12:46 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………31 WNW @ 12:16 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………28 WNW @  2:04 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..27 WNW @ 12:43 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..30     @ 12:43 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL….11.8 WNW [282 total miles]
ASOS……………….11.3
DAVIS #1……………12.2 NW
DAVIS #2……………12.5 NW
RMY………………..11.1 NW
VECTOR……………..11.9

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00  DEPARTURE….-0.15
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….4.43  DEPARTURE….+2.07
ASOS………….4.65
TOTAL PRECIPITATION FOR THE YEAR…………..6.75  DEPARTURE….+0.19
ASOS…………7.00

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0  DEPARTURE…. -0.5
TOTAL SNOWFALL FOR THE MONTH………………29.0  DEPARTURE….+20.6
TOTAL SNOWFALL FOR THE SEASON……………..62.4  DEPARTURE….+20.9

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

The low since midnight is 20F, the daily normal low is 20F

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 18
HIGH 65F IN 1981
LOW -10F IN 1958
PRECIP 1.97 INCHES IN 1887, IN 1952
SNOWFALL 9.2 INCHES IN 1952
PEAK GUST 70 MPH S IN 2008

RECORDS FOR FEBRUARY 19
HIGH 66F IN 1981
LOW -5F IN 1923
PRECIP 2.73 INCHES IN 1972
SNOWFALL 8.9 INCHES IN 1964
PEAK GUST 76 MPH ENE IN 1972

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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