Thursday, January 17, 2019

| January 17, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JANUARY 17, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

A COLD AND DRY DAY WITH GOOD VISIBILITY ATOP
GREAT BLUE HILL…

Clouds have increased considerably since this morning,
with the majority of the sky becoming covered by a
cirrostratus layer following the 1 P.M. observation.
Cool and dry air has moved into the region, with a
minimum humidity so far today of 25%. Winds died down
after noontime, becoming light and variable. The high
so far today is 25F, eight degrees below the normal
maximum of 33F. The low since midnight is 13F, four
degrees below the daily normal minimum of 17.

Today’s Observations:

7 A.M.
Weather: Scattered cirrus
Temperature: 14F; Dew Point: 3F; Wind: NNW at 13G17 kts
Sea-level pressure: 29.65 ins. Hg, rising steadily
Visibility: 40 miles, thin smoke layer
6-hr Max temp: 26F
6-hr Min temp: 14F
24-hr Precip: 0.00
24-hr snowfall: 0.0
Snow depth: 0 ins.
BHO SA 1155 200 SCT 40 265/14/3/3313G17/031/ THN K LYR
ALQDS/ 8/050 51023 10026 20014

10 A.M.
Weather: Scattered cirrus
Temperature: 19F; Dew Point: 0F; Wind: NNW at 8 kts
Sea-level pressure: 30.38 ins. Hg, rising steadily
Visibility: 75 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 75 288/19/0/3408/038/ 8/002 53023

1 P.M.
Weather: Broken cirrostratus
Temperature: 25F; Dew Point: -5F; Wind: WNW at 3 kts,
Wind: Light and variable
Sea-level pressure: 30.33 ins. Hg, falling steadily
Visibility: 75 miles
6-hr Max temp: 26F
6-hr Min temp: 13F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 250 SCT 75 272/25/-5/3003/033/ WND L/V/ 8/008
58016 10026 20013

SUMMARY FOR WEDNESDAY, JANUARY 16, 2019

TEMPERATURE (DEGREES F)
MAX…..34   NORMAL…..33
MIN…..23   NORMAL…..17
MEAN….29   NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL……………………+4
TOTAL DEPARTURE FOR THE MONTH…………………..+50 [+2.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..36   DEPARTURE………-4
TOTAL HEATING UNITS FOR THE MONTH………….579   DEPARTURE……..-48
TOTAL HEATING UNITS FOR THE SEASON………..2875   DEPARTURE……..-57
TOTAL HEATING UNITS LAST SEASON TO DATE……2818   DIFFERENCE…….+57

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..33  W AT 8:53 P.M.
AERO…………………….32  W AT 8:51 P.M.
ASOS…………………….35  W AT 8:55 P.M.
DAVIS……………………36  W AT 8:53 P.M. RMY 35
FASTEST MILE FOR YESTERDAY………………….25  W AT 8:48 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….24  W AT 8:55 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………27  W AT 8:55 P.M.
AVERAGE WIND SPEED AND DIRECTION……………13.4 W
ASOS……………………13.9
DAVIS…………………..13.6 W [259 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…….-0.14
ASOS…………..2.15
TOTAL PRECIPITATION FOR THE YEAR………..2.14  DEPARTURE…….-0.14
ASOS…………..2.15

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.5
TOTAL SNOWFALL FOR THE MONTH…………..Trace  DEPARTURE……..-9.0
TOTAL SNOWFALL FOR THE SEASON……………7.7  DEPARTURE…….-17.3

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 32/20/26/+1/T/T/…/..               37 NW  AERO 41 NW  RMY 43
01/11 26/12/19/-6/0.00/0.0/…/..          36 WNW AERO 37 WNW RMY 38
01/12 26/9/18/-7/0.00/0.0/…/..           32 NW  AERO 32 NW  RMY 29
01/13 25/11/18/-7/0.00/0.0/…/..          18 NNW AERO 16 NW  RMY N/A
01/14 27/20/24/-1/0.00/0.0/…/..          20 NNE AERO 17 N   RMY N/A
01/15 34/18/26/+1/0.00/0.0/…/.. 22 NW  AERO 21 NNW RMY N/A
01/16 34/23/29/+4/0.00/0.0/…/.. 33 W AERO 32 W RMY 35

01/17 Low temp since midnight is 13F; normal low is 17F

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

RECORDS FOR JANUARY 17
HIGH 55F IN 1973,1995
LOW -8F IN 1907,1982
PRECIP 1.43 INS. IN 1956
SNOWFALL 13.4 INS. IN 1956
PEAK GUST 62 MPH S IN 1994

RECORDS FOR JANUARY 18
HIGH 62F IN 1973,1990
LOW -10F IN 1982
PRECIP 1.68 INS. IN 1915
SNOWFALL 13.0 INS. IN 1948
PEAK GUST 85 MPH SSE IN 2006

TODAY’S REPORT PREPARED BY: Ben Turner and Nicholas Rousseau

Category: Daily Discussions

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