Sunday, January 5, 2020

| January 5, 2020 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JANUARY 5, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERNIGHT RAIN ENDED AS SNOW THIS MORNING, MUCH COLDER
TODAY, BUT STILL RUNNING ABOVE NORMAL…

Rain turned to snow in the wee hours of the morning this
morning and accumulated 0.5″. Snow had ended by the 7 A.M.
observation. Total liquid precipitation for the 24 hours
ending at 7 A.M. was 0.30″.

In the wake of the snow, mostly cloudy skies has been the
theme with a very gusty northwest wind due to a rising
barometer and strong cold air advection. The peak gust so
far today is 43 MPH.

Visibility has improved from 50 miles early this morning to
an excellent 80 miles early this afternoon.

Temperatures haven’t risen much from the early morning values,
again thanks to the strong cold air advection. The high so far
today is 36F (set back at midnight), this is 2 degrees above
the daily normal maximum of 34F. The low since midnight is 31F,
which is 13 degrees above the normal low of 18F.

Today’s Observations:

7 A.M.
Weather: Scattered stratocumulus, overcast altostratus
Temperature: 31F; Dew Point: 28F; Wind: NW at 21G33 kts
Sea-level pressure: 29.55 ins. Hg, rising, then more rapidly
Visibility: 50 miles
6-hr Max temp: 35F
6-hr Min temp: 31F
24-hr Precip:  0.30 ins.
24-hr Snowfall: 0.5 ins.
BHO SA 1155 45 SCT E70 OVC 50 008/31/28/3221G33/955/ FEW BINOVC
ALQDS PK WND 3233/53/ SEUKN TOTAL NEW SNOW LAST 24 HRS 0.5 INS/
8/55/ 4/000 53030 6/// 70030 10035 20031

10 A.M.
Weather: Broken stratocumulus, altocumulus layer offshore distant
NE-SE
Temperature: 33F; Dew Point: 24F; Wind: NW at 19G32 kts
Sea-level pressure: 29.64 ins. Hg, rising, then more slowly
Visibility: 70 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E35 BKN 70 036/33/24/3119G32/964/ AC LYR OFFSHR DSNT
NE-SE PK WND 3232/54/ 8/570 52028

1 P.M.
Weather: Broken stratocumulus
Temperature: 33F; Dew Point: 23F; Wind: NW at 19G34 kts
Sea-level pressure: 29.66 ins. Hg, steady, then rising
Visibility: 80 miles
6-hr Max temp: 35F
6-hr Min temp: 31F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 E35 BKN 80 045/33/23/3119G34/966/ PK WND 3134/47/ 8/500
4/000 53009 10035 10031

SUMMARY FOR SATURDAY, JANUARY 4, 2020

TEMPERATURE (DEGREES F)
MAX…..46   NORMAL…..34
MIN…..36   NORMAL…..18
MEAN….41   NORMAL…..26

DEPARTURE FROM 30-YEAR NORMAL…………………+15
TOTAL DEPARTURE FOR THE MONTH…………………+50 [+12.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………24  DEPARTURE…….-16
TOTAL HEATING UNITS FOR THE MONTH…………..104  DEPARTURE…….-50
TOTAL HEATING UNITS FOR THE SEASON…………2355  DEPARTURE……-103
TOTAL HEATING UNITS LAST SEASON TO DATE…….2412  DEPARTURE…….-57

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..16 NNW AT 11:31 P.M.
                   AERO…………………….16 NNW AT 11:23 P.M.
                   ASOS…………………….17 N   AT 10:49 P.M.
                   DAVIS……………………17 NNE AT 10:21 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….14 NNW AT 11:29 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….13 NNW AT 11:31 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………13 NNW AT 11:25 P.M.
AVERAGE WIND SPEED AND DIRECTION………….. 6.2 E
                   ASOS………………….. 7.1
                   DAVIS…………………. 6.8 NNE [018 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.30  DEPARTURE……+0.16
                         ASOS…………..0.30
TOTAL PRECIPITATION FOR THE MONTH……….0.30  DEPARTURE……-0.28
                         ASOS…………..0.31
TOTAL PRECIPITATION FOR THE YEAR………..0.30  DEPARTURE……-0.28
                         ASOS…………..0.31

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.5  DEPARTURE……. 0.0
TOTAL SNOWFALL FOR THE MONTH…………….0.5  DEPARTURE…….-1.7
TOTAL SNOWFALL FOR THE SEASON…………..20.5  DEPARTURE…….+2.3

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 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

12/01  32/16/24/-13/…./5.8/011/02           33 ENE AERO 32 ENE RMY N/A
12/02  37/25/31/-5/…./2.7/000/00            52 NE  AERO 47 NE  RMY 53
12/03  30/23/27/-9/…./4.6/000/00            32 N   AERO 35 N   RMY 36
12/04  34/22/28/-7/…./0.0/000/00            23 WNW AERO 23 NNW RMY N/A
12/05  41/26/34/-1/…./0.0/343/62            33 NW  AERO 35 NW  RMY 37
12/06  33/23/28/-7/0.02/0.1/000/00            25 NW  AERO 23 NW  RMY 29
12/07  31/18/25/-9/0.00/0.0/519/94            25 NW  AERO 23 NW  RMY N/A
12/08  36/15/26/-8/0.00/0.0/402/73            31 SSW AERO 32 SSW RMY N/A
12/09  57/36/47/+13/…./0.0/000/00           53 S   AERO 52 S   RMY 54
12/10  58/37/48/+15/…./0.0/044/08           35 SW  AERO 39 SW  RMY N/A
12/11  36/23/30/-3/…./3.0/236/43            25 NW  AERO 25 NW  RMY N/A
12/12  29/17/23/-10/…./1.8/488/89           29 W   AERO 30 W   RMY 25
12/13  46/22/34/+2/…./0.0/000/00            25 SSE AERO 25 SSE RMY N/A
12/14  58/46/52/+20/…./0.0/000/00           45 S   AERO 41 S   RMY N/A
12/15  48/28/38/+6/0.00/0.0/284/52            53 W   AERO 53 W   RMY 50
12/16  30/25/28/-3/0.00/0.0/000/00            36 W   AERO 36 W   RMY N/A
12/17  35/23/29/-2/…./1.0/000/00            22 NNW AERO 21 NE  RMY 23
12/18  33/18/26/-5/…/0.0/229/42             44 WNW AERO 45 WNW RMY N/A
12/19  20/9/15/-15/…/0.0/534/98             51 W   AERO 47 W   RMY N/A
12/20  29/11/20/-10/0.00/0.0/540/99           32 W   AERO 30 W   RMY 29
12/21  31/16/24/-6/0.00/0.0/163/30            16 SSE AERO 15 SSE RMY N/A
12/22  40/26/33/+4/0.00/0.0/…./..           23 SW  AERO 21 SW  RMY 23
12/23  54/33/44/+15/0.00/0.0/…./..          30 WSW AERO 30 SW  RMY 30
12/24  42/29/36/+7/0.00/0.0/…./..           30 NW  AERO 27 NW  RMY 30
12/25  42/25/34/+6/0.00/0.0/…./..           16 NNE AERO 16 N   RMY N/A
12/26  39/29/34/+6/0.00/0.0/…./..           22 ENE AERO 20 ENE RMY 22
12/27  47/31/39/+11/0.00/0.0/…./..          32 SSW AERO 30 SSW RMY 34
12/28  47/30/39/+11/0.00/0.0/…./..          23 W   AERO 22 W   RMY N/A
12/29  42/28/35/+8/…./0.0/…./..           22 WNW AERO 21 WNW RMY 23
12/30  36/32/34/+7/…./0.8/…./..           40 E   AERO 37 E   RMY 37
12/31  40/32/36/+9/…./0.0/…./..           35 E   AERO 32 E   RMY N/A    

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  38/30/34/+7/…./0.0/…./..           39 W   AERO 38 W   RMY 41
01/02  46/29/38/+11/0.00/0.0/…./..          28 SW  AERO 28 SW  RMY 30
01/03  46/40/43/+17/0.00/0.0/…./..          21 SW  AERO 18 SW  RMY N/A
01/04  46/36/41/+15/…./0.0/…./..          16 NNW AERO 16 NNW RMY N/A

01/05  The low since midnight is 31F, daily normal minimum is 18F

DAILY RECORDS FOR DECEMBER

12/01/19: DAILY RECORD SNOWFALL OF 5.8 INS.,
          BREAKS PREVIOUS RECORD OF 2.0 INS. SET IN 1902.

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

RECORDS FOR JANUARY 5
HIGH 61F IN 2007
LOW -9F IN 1981
PRECIP 1.15 INS. IN 2019
SNOW 4.5 INS. IN 1891
PEAK GUST 70 MPH WNW IN 1959

RECORDS FOR JANUARY 6
HIGH 66F IN 2007
LOW -14F IN 1896
PRECIP 3.10 INS. IN 1889 [RECORD FOR MONTH]
SNOWFALL 7.5 INS. IN 1893
PEAK GUST 70 MPH WNW IN 1959

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

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