Wednesday, January 9, 2019

| January 9, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JANUARY 9, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

SIGNIFICANT FOG THIS MORNING GIVES WAY TO CLOUDY SKIES AND
STRONG AFTERNOON WINDS….

Thick fog this morning subsided shortly before the 7 A.M
observation, along with an increase in wind from the west.
Ponds thawed overnight being seen completely unfrozen at
10 A.M. Rain over night left 0.13 inches of rain in the gauge
this morning. Wind picked up in the afternoon, gusting as high
as 44 mph. Some rain showers occurred at the end of the 1 P.M.
observation. Pressure has dropped over night, but it started
to increase after noontime. The high temperature so far today
is 42F, eight degrees above the daily normal maximum of 34F.
The low since midnight is 31F, 14 degrees above the normal
minimum of 17F.

BHO Greatest Annual Precipitation, inches (1886-2018):

1) 71.00 in 1998
2) 69.36 in 1996
3) 67.20 in 2018
4) 66.23 in 2005
5) 65.51 in 1972

Today’s Observations:

7 A.M.
Weather: Overcast stratocumulus, few stratus fractus,
patches of fog drifting below summit
Temperature: 35F; Dew Point: 35F; Wind: WSW at 15G18 kts
Sea-level pressure: 29.34 ins. Hg, falling, then more slowly
Visibility: 40 miles
6-hr Max temp: 35F
6-hr Min temp: 31F
24-hr Precip: 0.13 in
24-hr snowfall: Trace
Snow depth: 0 ins.
BHO SA 1155 E40 OVC 40 934/35/35/2515G18/934/ FEW STFA ALQDS
PTCHS FG DRFTG BLO SMT/ 8/4// 70013 56028 10035 20031

10 A.M.
Weather: Broken stratocumulus
Temperature: 38F; Dew Point: 32F; Wind: WSW at 19G30 kts,
Peak wind: 35 MPH (30 kts) WSW at 9:34 A.M
Sea-level pressure: 29.31 ins. Hg, falling steadily
Visibility: 50 miles
3-hr Precip: 0.00 ins
BHO SA 1455 E30 BKN 50 927/38/32/2519G30/931/ PK WND 2530/34/
8/400 56007

1 P.M.
Weather: Broken stratocumulus, few cumulus in all directions
Temperature: 41F; Dew Point: 32F; Wind: WSW at 25G36 kts,
Peak wind: 44 MPH (38 kts) W at 12:17 P.M
Sea-level pressure: 29.28 ins. Hg, falling steadily
Visibility: 60 miles
6-hr Max temp: 42F
6-hr Min temp: 35F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 E45 BKN 60 916/41/32/2925G36/928/ PK WND 2838/17/
8/800 55011 10042 20035

SUMMARY FOR TUESDAY, JANUARY 8, 2019

TEMPERATURE (DEGREES F)
MAX…..40   NORMAL…..34
MIN…..24   NORMAL…..18
MEAN….32   NORMAL…..26

DEPARTURE FROM 30-YEAR NORMAL……………………+6
TOTAL DEPARTURE FOR THE MONTH…………………..+54 [+6.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..33   DEPARTURE………-6
TOTAL HEATING UNITS FOR THE MONTH………….256   DEPARTURE……..-54
TOTAL HEATING UNITS FOR THE SEASON………..2552   DEPARTURE……..-62
TOTAL HEATING UNITS LAST SEASON TO DATE……2548   DIFFERENCE…….+4

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..24 SSE  AT 5:01  A.M.
AERO…………………….23 SSE  AT 8:48  A.M.
ASOS…………………….24 SSE  AT 9:03  A.M.
DAVIS……………………27 S    AT 4:58  A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….20 SSE  AT 9:00  A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 S    AT 10:40 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………20 SSE  AT 9:03  A.M.
AVERAGE WIND SPEED AND DIRECTION…………..10.0 SSE
ASOS…………………..9.9
DAVIS………………….10.2 SSE [166 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.13  DEPARTURE…….-0.01
ASOS…………..0.12
TOTAL PRECIPITATION FOR THE MONTH……….2.14  DEPARTURE…….+1.00
ASOS…………..2.14
TOTAL PRECIPITATION FOR THE YEAR………..2.14  DEPARTURE…….+1.00
ASOS…………..2.14

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……..Trace  DEPARTURE……..-0.6
TOTAL SNOWFALL FOR THE MONTH…………..Trace  DEPARTURE……..-4.5
TOTAL SNOWFALL FOR THE SEASON……………7.7  DEPARTURE…….-12.8

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 49/37/43/+11/0.06/0.0/000/00         28 NE  AERO 27 NE  RMY 30
12/16 40/37/39/+8/0.68/0.0/000/00          38 NE  AERO 38 NE  RMY 40
12/17 37/32/35/+4/0.15/0.0/000/00          39 NNE AERO 37 NNE RMY N/A
12/18 34/20/27/-4/0.02/0.1/469/86          48 NW  AERO 55 NW  RMY 48
12/19 38/17/28/-2/0.00/0.0/501/92          23 WNW AERO 23 WNW RMY N/A
12/20 47/30/39/+9/0.00/0.0/311/57          23 SW  AERO 22 SW  RMY N/A
12/21 62/43/53/+23/1.01/0.0/000/00         60 SSE AERO 62 SSE RMY 63
12/22 54/31/43/+14/0.01/0.0/109/20         41 W   AERO 45 W   RMY 43
12/23 38/27/33/+4/0.00/0.0/540/99         30 WNW AERO 32 WNW RMY N/A
12/24 34/27/31/+2/0.01/T/109/20            21 W   AERO 21 W   RMY N/A
12/25 35/23/29/+1/0.00/0.0/534/98          28 NW  AERO 28 NW  RMY 29
12/26 36/20/28/0/0.00/0.0/496/91           24 NW  AERO 24 NW  RMY 25
12/27 35/26/31/+3/0.00/0.0/508/93          23 NW  AERO 22 NW  RMY N/A
12/28 54/30/42/+14/0.42/0.0/000/00         44 SSW AERO M  M   RMY 47
12/29 54/30/42/+15/0.00/0.0/492/90         38 WNW AERO 38 WNW RMY 38
12/30 33/23/28/+1/0.00/0.0/334/61          24 NNW AERO 21 NNW RMY 17
12/31 41/28/35/+8/0.44/T/214/39            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 43/30/37/+11/…./…/…/..         29 SW  AERO 29 SW  RMY 29
01/05 41/32/37/+11/1.19/…/…/..         26 NE  AERO 25 NNW RMY 27
01/06 42/21/32/+6/0.00/0.0/…/..          42 NW  AERO 46 NW  RMY 50
01/07 26/14/20/-6/…/…/…/.. 37 NW  AERO 41 NW  RMY N/A
01/08 40/24/32/+6/…/…/…/.. 24 SSE AERO 23 SSE RMY N/A

01/09 Low temp since midnight is 24F; normal low is 18F

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

RECORDS FOR JANUARY 9
HIGH 62F IN 1937
LOW -9F IN 1968
PRECIP 3.00 INS. IN 1956
SNOWFALL 10.0 INS. IN 1904
PEAK GUST 101e MPH SE IN 1978 [RECORD FOR MONTH]

RECORDS FOR JANUARY 10
HIGH 58F IN 2016
LOW -7F IN 2004
PRECIP 2.16 INS. IN 1935
SNOWFALL 6.3 INS. IN 1977
PEAK GUST 73e SE IN 1977

TODAY’S REPORT PREPARED BY:  Nick Rousseau and Benjamin Turner

Category: Daily Discussions

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