Friday, January 4, 2019

| January 4, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JANUARY 4, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

A WARMER THAN NORMAL DAY WITH INCREASING AFTERNOON
CLOUDS ATOP GREAT BLUE HILL….

Today started with some scattered cirrus clouds that increased
with a pressure drop of almost 4 millibars by 1 P.M. Wind has
remained southwesterly for the majority of the day, and
visibility has been 70 miles since the 10 A.M. observation.
The maximum temperature so far today is 43F. This is 9 degrees
above the normal high of 35F. The ponds have thawed out
considerably, losing any  noticeable ice cover by 10 A.M.
The low since midnight is 30F, 12 degrees above the daily
normal minimum of 18F.

Today’s Observations:

7 A.M.
Weather: Scattered cirrus
Temperature: 31F; Dew Point: 24F; Wind: SW at 12G16 kts
Sea-level pressure: 29.96 ins. Hg, rising then falling
Visibility: 40 miles, thin smoke layer
6-hr Max temp: 32F
6-hr Min temp: 31F
24-hr Precip: 0.01 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 250 SCT 40 145/31/24/2112G16/996/ THN K LYR
ALQDS/ 8/002 70001 55002 10032 20031

10 A.M.
Weather: Scattered cirrus
Temperature: 38F; Dew Point: 24F; Wind: SW at 15G21 kts
Sea-level pressure: 29.93 ins. Hg, falling steadily
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 70 136/38/24/2115G21/993/ 8/002 58009

1 P.M.
Weather: Broken cirrostratus
Temperature: 42F; Dew Point: 25F; Wind: WSW at 10G15 kts
Sea-level pressure: 29.85 ins. Hg, falling rapidly
Visibility: 70 miles
6-hr Max temp: 43F
6-hr Min temp: 31F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 E250 BKN 70 107/42/25/2510G15/985/ 8/007
56029 10043 20031

SUMMARY FOR THURSDAY, JANUARY 3, 2019

TEMPERATURE (DEGREES F)
MAX…..42   NORMAL…..35
MIN…..28   NORMAL…..19
MEAN….35   NORMAL…..26

DEPARTURE FROM 30-YEAR NORMAL……………………+9
TOTAL DEPARTURE FOR THE MONTH…………………..+26 [+8.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..30   DEPARTURE………-9
TOTAL HEATING UNITS FOR THE MONTH…………..89   DEPARTURE……..-26
TOTAL HEATING UNITS FOR THE SEASON………..2385   DEPARTURE……..-35
TOTAL HEATING UNITS LAST SEASON TO DATE……2287   DIFFERENCE…….+98

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..22 WNW AT  1:32 P.M.
AERO…………………….30 WNW AT 12:58 P.M.
ASOS…………………….28 NW  AT  2:56 P.M.
DAVIS……………………30 NW  AT  1:03 P.M. RMY 30
FASTEST MILE FOR YESTERDAY………………….21 NW  AT  1:02 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….21 NW  AT  1:04 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………22 NW  AT  3:10 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..12.3 NW
ASOS…………………..12.1
DAVIS………………….12.5 W [262 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01  DEPARTURE…….-0.14
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….0.82  DEPARTURE…….+0.38
ASOS…………..0.80
TOTAL PRECIPITATION FOR THE YEAR………..0.82  DEPARTURE…….+0.38
ASOS…………..0.80

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.6
TOTAL SNOWFALL FOR THE MONTH…………..Trace  DEPARTURE……..-1.7
TOTAL SNOWFALL FOR THE SEASON……………7.7  DEPARTURE…….-10.0

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 41/28/35/-2/0.00/0.0/391/70          20 NNW AERO 18 NNW RMY N/A
12/02 52/35/44/+8/1.04/0.0/000/00          28 ESE AERO 25 ESE RMY 27
12/03 54/38/46/+10/0.00/0.0/178/32         35 W   AERO 35 W   RMY 38
12/04 38/23/31/-4/0.00/0.0/516/93          30 WNW AERO 31 WNW RMY 33
12/05 33/18/26/-9/0.00/0.0/432/78          16 NNW AERO 15 NNW RMY N/A
12/06 37/24/31/-4/0.00/0.0/354/64          29 W   AERO 28 W   RMY 30
12/07 37/21/29/-5/0.00/0.0/546/99          29 NW  AERO 29 NW  RMY 32
12/08 27/15/21/-13/0.00/0.0/518/94         28 NW  AERO 27 NW  RMY 29
12/09 34/17/26/-8/0.00/0.0/391/71          23 SSW AERO 21 SSW RMY 22
12/10 36/22/29/-4/0.00/0.0/544/99          24 NNW AERO 23 NNW RMY 22
12/11 36/17/27/-6/0.00/0.0/543/99          16 WSW AERO 14 WSW RMY N/A
12/12 35/18/27/-6/0.00/0.0/471/86          30 NW  AERO 29 NW  RMY M
12/13 31/16/24/-8/0.00/0.0/088/16          16 NNE AERO 12 SE  RMY N/A
12/14 46/28/37/+5/0.00/0.0/399/73          28 SSW AERO 28 SSW RMY 29
12/15 49/33/43/+11/0.04/0.0/000/00         28 NE  AERO 27 NE  RMY 30
12/16 40/37/39/+8/…./0.0/000/00          38 NE  AERO 38 NE  RMY 40
12/17 37/32/35/+4/…./0.0/000/00          39 NNE AERO 37 NNE RMY N/A
12/18 34/20/27/-4/0.02/0.1/456/86          48 NW  AERO 55 NW  RMY 48
12/19 38/17/28/-2/0.00/0.0/486/92          23 WNW AERO 23 WNW RMY N/A
12/20 47/30/39/+9/0.00/0.0/300/57          23 SW  AERO 22 SW  RMY N/A
12/21 62/43/53/+23/…./0.0/000/00         60 SSE AERO 62 SSE RMY 63
12/22 54/31/43/+14/…./0.0/108/21         41 W   AERO 45 W   RMY 43
12/23 38/27/33/+4/0.00/0.0/522/99          30 WNW AERO 32 WNW RMY N/A
12/24 34/27/31/+2/0.01/T/108/21            21 W   AERO 21 W   RMY N/A
12/25 35/23/29/+1/0.00/0.0/516/98          28 NW  AERO 28 NW  RMY 29
12/26 36/20/28/0/0.00/0.0/480/91           24 NW  AERO 24 NW  RMY 25
12/27 35/26/31/+3/0.00/0.0/…/..          23 NW  AERO 22 NW  RMY N/A
12/28 54/30/42/+14/…./0.0/…/..         44 SSW AERO M  M   RMY 47
12/29 54/30/42/+15/…./…/…/..         38 WNW AERO 38 WNW RMY 38
12/30 33/23/28/+1/0.00/0.0/…/..          24 NNW AERO 21 NNW RMY 17
12/31 41/28/35/+8/…./T/…/..            33 SSE AERO 32 SSE 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 54/29/42/+15/…./0.0/…/..         53 W   AERO 53 W   RMY 54
01/02 34/24/29/+2/…./…/…/..          22 NW  AERO 22 NW  RMY N/A
01/03 42/28/35/+9/0.01/T/…/..            28 WNW AERO 30 WNW RMY 30

01/04 Low temp since midnight is 30F; normal low is 18F

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

RECORDS FOR JANUARY 4
HIGH 60F IN 2000
LOW -8F IN 1904, 1981
PRECIP 1.79 INS. IN 1982
SNOW 16.5 INS. IN 2018
PEAK GUST 84 MPH S IN 1982

RECORDS FOR JANUARY 5
HIGH 61F IN 2007
LOW -9F IN 1981
PRECIP 0.98 INS. IN 1993
SNOW 4.5 INS. IN 1891
PEAK GUST 70 MPH WNW IN 1959

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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