Tuesday, February 9, 2021

| February 9, 2021 | Reply

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

TUESDAY, FEBRUARY 9, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0648E
SUNSET:  1709E

CLOUDY AND COLD WITH SNOW DEVELOPING LATE MORNING….

After our one day reprieve yesterday, today we’re back to
cloudy skies and more snow! Snow began falling just before
11 A.M. and amounted to 0.5″ by the 1 P.M. observation.
0.03″ of liquid resulted, giving us a ratio of around 17:1.
So it’s once again a nice fluffy snow.

Wind has been very light today, even going calm at times.
The average wind speed since 7 A.M. is only around 5 mph.

The high so far today is 27F, 9 degrees below the daily
average max of 36F. The low since midnight is 18F, equal
to the normal minimum of 18F.
PRELIMINARY STATS FOR JANUARY 2021

TEMPERATURE, Deg. F
Avg. Max. 35.4 [+1.6]
Avg. Min. 22.5 [+5.4]
Mean      28.9 [+3.4]
24-hour corrected mean: 28.8
Max. for month: 52F on the 16th
Min. for month: 2F on the 31st

HEATING DEGREE DAYS
Total heating units:   1114 [-112]
Total for the season:  3044 [-487]
Total for last season: 3531

PRECIPITATION, Inches
Total: 2.32 [-2.03]
Greatest in 24 hrs: N/A

SNOWFALL, Inches
Total: 7.2 [-9.9]
Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 11.1 mph
Avg. corrected wind speed:   11.7 mph
Prevailing wind direction:   NW [25%]
Peak gust and direction:     48 ESE on the 16th

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes: N/A

Today’s Observations:

7 A.M.
Weather: Overcast Altostratus, few breaks in overcast
distant E-SE, few stratocumulus offshore distant NE-E,
few lower altocumulus W-NW-NE
Temperature: 21F; Dew Point: 12F; Relative Humidity: 68%
Wind: ENE @ 6 kts
Sea-level pressure: 30.38 in Hg; rising, then falling
Visibility: 20 miles, 30 miles E-SE
6-hr Max temp: 21F
6-hr Min temp: 19F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 15 ins.
BHO SA 1155 E95 OVC 20 288/21/12/0706/038/ FEW BINOVC DSNT E-SE FEW SC OFFSHR DSNT NE-E FEW LWR AC W-NW-NE HIER CLDS VSBL DSNT E-SE VIRGA ALQDS THN K LYR BLW INVRSN ALQDS VSBY 30 E-SE/ 8/52/ 4/015 58008 10021 20019

10 A.M.
Weather: Broken stratus, overcast nimbostratus,
few stratocumulus offshore distant NE-E, sun dimly visible,
virga all quadrants
Temperature: 25F; Dew Point: 12F; Relative Humidity: 57%
Wind: SE @ 7 kts
Sea-level pressure: 30.32 in Hg; falling, then more rapidly
Visibility: 30 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 E40 BKN 80 OVC 30 269/25/12/1407/032/ FEW SC OFFSHR DSNT NE-E SUN DMLY VSBL VIRGA ALQDS/ 8/62/ 58019

1 P.M.
Weather: Broken stratus fractus, overcast nimbostratus, light snow
Temperature: 25F, Dew point: 24F; Relative Humidity: 96%
Wind: ENE @ 2 kts, wind light
Sea-level pressure: 30.22 in Hg, falling, then more rapidly
Visibility: 2.5 miles, fog
6-hr Max temp: 27F
6-hr Min temp: 21F
6-hr Precip: 0.03 ins.
6-hr Snow: 0.5 ins.
Snow Depth: 15 ins.
BHO SA 1755 E9 BKN 20 OVC 21/2S-F 234/25/24/0602/022/ WND LGT TOTAL NEW SNW PST 6 HRS 0.5 INS/ 8/6// 4/015 58035 6003/ 10027 20021

SUMMARY FOR MONDAY, FEBRUARY 8, 2021

TEMPERATURE (DEGREES F)
MAX…….27   NORMAL…..35
MIN…….13   NORMAL…..18
MEAN……20   NORMAL…..27

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……… -7
TOTAL DEPARTURE FOR THE MONTH…………………+28 [+3.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………45  DEPARTURE…… +7
TOTAL HEATING UNITS FOR THE MONTH…………. 282  DEPARTURE….. -29
TOTAL HEATING UNITS FOR THE SEASON…………3326  DEPARTURE…..-516
TOTAL HEATING UNITS LAST SEASON TO DATE…….3469  DEPARTURE…..-143

PEAK WIND GUST (MPH):
420C/Official…………..29 NW  @  2:18 A.M.
AEROVANE (south tower)…..31 WNW @  1:30 A.M.
ASOS…………………..30 NW  @  2:19 A.M.
DAVIS #1……………….29 NNW @  2:18 A.M.
DAVIS #2 (south tower)…..28 W   @ 12:16 A.M.
RMY……………………32     @ 12:01 A.M
VECTOR…………………36     @  1:25 A.M.
MERLIN…………………N/A

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 NW  @  2:57 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….21 WNW @ 12:02 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 NW  @  2:20 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 NW  @ 12:17 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..19 NNW @  2:17 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..20     @ 12:00 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL….10.5 WNW [253 total miles]
ASOS……………….11.0
DAVIS #1……………11.5 WNW
DAVIS #2……………11.7 WNW
RMY………………..10.7 WNW
VECTOR……………..11.1

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00  DEPARTURE….-0.13
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….3.52  DEPARTURE….+2.46
ASOS………….3.75
TOTAL PRECIPITATION FOR THE YEAR…………..5.84  DEPARTURE….+0.43
ASOS…………6.10

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………. 0.0  DEPARTURE…. -0.5
TOTAL SNOWFALL FOR THE MONTH………………26.8  DEPARTURE….+22.9
TOTAL SNOWFALL FOR THE SEASON……………..60.2  DEPARTURE….+23.2

PRELIMINARY CLIMATE SUMMARY FOR JANUARY 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

01/01   36/25/31/+4/0.06/0.3/330/60       23 E    AERO 23 NNW  RMY 23
01/02   43/30/37/+10/0.30/T/116/21        37 WNW  AERO 39 WNW  RMY 44
01/03   33/27/30/+4/0.07/0.8/000/00       23 NNE  AERO 22 NNE  RMY 25
01/04   37/28/33/+7/0.01/0.1/110/20       25 NNE  AERO 23 NNE  RMY 27
01/05   31/28/30/+4/0.05/0.7/000/00       21 NNW  AERO 21 NNW  RMY 22
01/06   38/28/33/+7/T/T/244/44            30 NW   AERO 29 NW   RMY 32
01/07   42/26/34/+8/0.00/0.0/516/93       28 NNW  AERO 26 NNW  RMY 31
01/08   40/21/31/+5/0.00/0.0/517/93       25 NNW  AERO 22 NNW  RMY 25
01/09   34/30/27/+1/0.00/0.0/395/71       25 N    AERO 23 N    RMY 24
01/10   39/24/32/+7/0.00/0.0/493/88       25 NNW  AERO 23 NNW  RMY 24
01/11   34/25/30/+5/0.00/0.0/000/00       17 SW   AERO 16 SSW  RMY 16
01/12   40/24/32/+7/0.00/0.0/438/78       23 WNW  AERO 23 WNW  RMY 24
01/13   40/26/33/+8/0.00/0.0/389/69       15 SW   AERO 14 SW   RMY 19
01/14   38/31/35/+10/0.09/T/000/00        16 SSW  AERO 16 SSW  RMY 19
01/15   40/32/36/+11/0.00/0.0/266/47      25 ESE  AERO 23 ESE  RMY 27 TSTM
01/16   52/33/43/+18/1.00/0.0/000/00      48 ESE  AERO 53 SE   RMY 54
01/17   41/32/37/+12/0.00/0.0/314/55      47 W    AERO 46 W    RMY 54
01/18   42/27/35/+10/T/0.0/366/64         35 W    AERO 37 WNW  RMY 36
01/19   39/23/31/+6/T/T/293/51            25 WNW  AERO 25 WNW  RMY 27
01/20   37/22/30/+5/T/T/144/25            32 WNW  AERO 33 WNW  RMY 34
01/21   31/17/24/-1/T/0.1/081/14          23 WNW  AERO 24 SSW  RMY 24
01/22   42/29/36/+11/0.00/0.0/226/39      28 WNW  AERO 24 WNW  RMY 29
01/23   29/14/22/-3/0.00/0.0/442/76       41 WNW  AERO 41 WNW  RMY 46
01/24   29/13/21/-4/0.00/0.0/571/98       43 WNW  AERO 48 WNW  RMY 44
01/25   35/15/25/0/0.00/0.0/…/..        28 NW   AERO 29 NW   RMY 30
01/26   36/20/28/+3/0.17/2.4/…/..       18 E    AERO 18 E    RMY 20
01/27   33/27/30/+5/0.12/1.9/…/..       16 NNW  AERO 17 NNW  RMY 17
01/28   29/13/21/-4/0.09/0.9/…/..       39 NW   AERO 48 NW   RMY 42
01/29   15/4/10/-15/0.00/0.0/…/..       44 NW   AERO 46 NW   RMY 50
01/30   19/3/11/-15/0.00/0.0/…/..       24 NW   AERO 28 NW   RMY 27
01/31   23/2/13/-13/0.00/0.0/…/..       18 NW   AERO 18 NW   RMY 19

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/…/..      53 NE   AERO 65 NE   RMY 62
02/02   34/29/32/+6/0.91/1.6/…/..       52 NNE  AERO 55 NE   RMY 58
02/03   34/26/30/+4/0.01/0.2/…/..       20 NW   AERO 20 NW   RMY 22
02/04   37/26/32/+6/0.02/0.7/…/..       23 NW   AERO 22 NW   RMY M
02/05   39/26/33/+7/0.01/T/…/..         33 S    AERO 32 S    RMY 30
02/06   40/28/34/+8/0.00/0.0/…/..       42 WSW  AERO 41 WSW  RMY 47
02/07   35/25/30/+3/0.71/11.6/…/..      27 WNW  AERO 28 WNW  RMY 30
02/08   27/13/20/-7/0.00/0.0/…/..       29 NW   AERO 31 WNW  RMY 32

02/09 The low since midnight is 18F, the daily normal low is 18F

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 9
HIGH 58F IN 1990
LOW -21F IN 1934 [LOWEST TEMPERATURE ON RECORD]
PRECIP 2.12 INS. IN 1969
SNOWFALL 16.9 INS. IN 2016
PEAK GUST 89 MPH NE IN 1969

RECORDS FOR FEBRUARY 10
HIGH 56F IN 1909
LOW -8F IN 1899
PRECIP 1.34 INS. IN 1909
SNOWFALL 12.1 INS. IN 1926
PEAK GUST 64 MPH W IN 2001

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

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