Thursday, January 10, 2019

| January 10, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JANUARY 10, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

NORTH-WESTERLY WINDS WITH OCCASIONAL FLURRIES THROUGHOUT
THE DAY ATOP GREAT BLUE HILL….

Visibility fell from 40 to 15 miles today, due to an increasing
fog in the distance. Winds remained northwesterly, keeping
temperatures in the low 30’s. The highest gust so far today is
33 mph, occurring a little after noontime. Very light snow
was seen at each observation, but ended shortly after 1 P.M.
The occasional flurries only left trace amounts of precipitation,
with no measurable accumulation. The high temperature so far
today is 32F, 2 degrees below the daily normal maximum of 34F.
The low since midnight is 29F, 12 degrees above the normal
minimum of 17F. As far as snowfall, we are currently 13.4 inches
below normal amounts for the season!

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: Very light snow, broken stratocumulus
Temperature: 30F; Dew Point: 23F; Wind: WNW at 12G20 kts
Sea-level pressure: 29.43 ins. Hg, increasing steadily
Visibility: 40 miles, except 20 miles due to distant fog S-NW
6-hr Max temp: 31F
6-hr Min temp: 29F
24-hr Precip: Trace
24-hr snowfall: Trace
Snow depth: 0 ins.
BHO SA 1155 E55 BKN 40S- 967/30/23/3012G20/943/ DSNT FG S-NW
VSBY 20 S-NW S-CTD PCPN VRY LGT/ 8/800 52006 10031 20029

10 A.M.
Weather: Very light snow, overcast altostratus
Temperature: 31F; Dew Point: 18F; Wind: NW at 18G26 kts,
Peak wind: 26 MPH (30 kts) NW at 9:51 A.M
Sea-level pressure: 29.49 ins. Hg, rising steadily
Visibility: 20 miles, distant fog
3-hr Precip: Trace
BHO SA 1455 E60 OVC 20S- 987/31/18/3118G26/949/ DSNT FG ALQDS
S-CTD PCPN VRY LGT PK WND 3126/51/ 8/02/ 600// 51020

1 P.M.
Weather: Very light snow, broken nimbostratus
Temperature: 31F; Dew Point: 24F; Wind: NW at 14G28 kts,
Peak wind: 29 MPH (33 kts) NW at 12:03 P.M
Sea-level pressure: 29.50 ins. Hg, rising steadily
Visibility: 15 miles
6-hr Max temp: 32F
6-hr Min temp: 29F
6-hr Precip: Trace
6-hr snowfall: Trace
Snow depth: 0 ins.
BHO SA 1755 E40 VBKN 15S- 990/31/24/3114G28/950 FG ALQDS
S-CTD PCPN VRY LGT PK WND 3129/03/ 8/020 600// 53003 10032 20029

SUMMARY FOR WEDNESDAY, JANUARY 9, 2019

TEMPERATURE (DEGREES F)
MAX…..42   NORMAL…..34
MIN…..31   NORMAL…..18
MEAN….37   NORMAL…..26

DEPARTURE FROM 30-YEAR NORMAL…………………..+11
TOTAL DEPARTURE FOR THE MONTH…………………..+65 [+7.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..28   DEPARTURE………-11
TOTAL HEATING UNITS FOR THE MONTH………….284   DEPARTURE……..-65
TOTAL HEATING UNITS FOR THE SEASON………..2580   DEPARTURE……..-74
TOTAL HEATING UNITS LAST SEASON TO DATE……2580   DIFFERENCE…….+0

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY…………………44  W   AT 12:17 P.M.
AERO……………………..46  WNW AT 2:58  P.M.
ASOS……………………..46  W   AT 12:18 P.M.
DAVIS…………………….46  WNW AT 2:07  P.M. RMY 45
FASTEST MILE FOR YESTERDAY…………………..35  W   AT 12:55 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………..31  W   AT 6:24  P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………….35  W   AT 2:19  P.M.
AVERAGE WIND SPEED AND DIRECTION…………..17.02  W
ASOS…………………..17.2
DAVIS………………….17.5 W [181 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.14  DEPARTURE…….+0.86
ASOS…………..2.14
TOTAL PRECIPITATION FOR THE YEAR………..2.14  DEPARTURE…….+0.86
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……..-5.1
TOTAL SNOWFALL FOR THE SEASON……………7.7  DEPARTURE…….-13.4

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 42/31/37/11/…/…/…/.. 44 W AERO 46 WNW RMY 45

01/10 Low temp since midnight is 29F; normal low is 17F

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

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

RECORDS FOR JANUARY 11
HIGH 59F IN 1975
LOW -7F IN 1968
PRECIP 1.58 INS. IN 2008
SNOW 10.2 INS. 1927
PEAK GUST 95e MPH S IN 1980

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

Category: Daily Discussions

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