Sunday, January 14, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JANUARY 14, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

COLD COMES BACK AFTER RECORD BREAKING WARMTH

Temperatures that fell rapidly yesterday after a shift in this winds
continued to fall throughout the night and settled at 11 degrees for
a low this morning, which is a drop of 46 degrees in just 24 hours.

Three daily records have been broken this week, including a record
high dating back to 1890 and 1932.

Winds were very gusty yesterday but have calmed some today, with a max
gust only to 23 this morning compared to the 58 mph gusts from yesterday
morning. The barometric pressure, which began to rise rapidly yesterday,
has continued that trend today. Mostly cloudy skies are clearing some as
drier air come in, but there is a persistent cloud layer to the east and
south that does not show any signs of going away.

Today’s Observations:

7 A.M.
Weather: Broken Altocumulus, Few Altostratus ENE-SSE
Temperature: 11F; Dew Point: 1F; Wind: NNW at 12G20 kts,
Sea-level pressure: 30.41 ins. Hg, rising, then more rapidly
Visibility: 50 miles, light distant haze
6-hr Max temp: 15F
6-hr Min temp: 11F
24-hr precip: Trace
24-hr snowfall: 0.00 ins.
Snow depth: 0 ins.
BHO SA 1155 E12 BKN 50 316/11/1/3312G20/041/ FEW AS ENE-S LGT DSNT HZ/
8/07/ 53032 MANUAL 700// 10015 20011

10 A.M.
Weather:
Temperature: 16F; Dew Point: 0F; Wind: NNW at 07 kts,
Sea-level pressure: 30.55 ins. Hg, rising steadily
Visibility: 70 miles,
3-hr precip: 0.00 ins.
BHO SA 1455 250 SCT CC 70 346/16/0/3407/055/ FEW AS NNE-S/ 8/029 52030

1 P.M.
Weather: Scattered Cirrostratus, Scattered Stratocumulus NNE-S, Few Altostratus S-SW
Temperature: 20F; Dew Point: 4F; Wind: WNW at 9 kts,
Sea-level pressure: 30.53 ins. Hg, steady then decreasing
Visibility: 80 miles
6-hr Max temp: 20F
6-hr Min temp: 11F
6-hr precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
BHO SA 1755 32 SCT 250 SCT 80 342/20/4/3209/053/ FEW AS S-SW VSBY 45
ENE-SSE/ 8/531 58004 10020 20011

SUMMARY FOR SATURDAY, JANUARY 13, 2018

TEMPERATURE (DEGREES F)
MAX…..60 NORMAL…..34
MIN…..17 NORMAL…..17
MEAN….39 NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL……………………..+14
TOTAL DEPARTURE FOR THE MONTH……………………..-48 [-3.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….26 DEPARTURE………-14
TOTAL HEATING UNITS FOR THE MONTH…………557 DEPARTURE………+49
TOTAL HEATING UNITS FOR THE SEASON……….2679 DEPARTURE……..-133
TOTAL HEATING UNITS LAST SEASON TO DATE…..2472 DIFFERENCE…….+207

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….58 SSW AT 7:14 A.M.*
AERO……………………60 SSW AT 7:08 A.M.*
ASOS……………………61 S AT 7:13 A.M.
DAVIS…………………..57 N/A** AT 7:13 A.M. RMY 62
FASTEST MILE FOR YESTERDAY…………………49 S AT 7:14 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………47 S AT 7:09 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..46 N/A** AT 7:09 A.M.
AVERAGE WIND SPEED AND DIRECTION………….24.3 S
ASOS………………….22.4
DAVIS…………………21.5 N/A
* LAST OF SEVERAL OCCURRENCES
** DAVIS DIRECTION MALFUNCTIONING

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE……-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.96 DEPARTURE……+2.11
ASOS…………..4.39
TOTAL PRECIPITATION FOR THE YEAR………..3.96 DEPARTURE……+2.11
ASOS…………..4.39

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0 DEPARTURE……..-0.5
TOTAL SNOWFALL FOR THE MONTH……………16.5 DEPARTURE……..+9.2
TOTAL SNOWFALL FOR THE SEASON…………..25.8 DEPARTURE……..+2.5

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

1/01 11/-5/3/-24/0.00/0.0/…/.. 30 NW AERO 30 NW RMY 31
1/02 15/-2/7/-20/0.00/0.0/…/.. 26 W AERO 25 W RMY 26
1/03 28/11/20/-6/0.00/0.0/…/.. 23 WSW AERO 20 WSW RMY N/A
1/04 28/18/23/-3/1.66/16.5/000/00 54 NNW AERO 60 NNW RMY 64
1/05 18/2/10/-16/0.00/0.0/…/.. 53 W AERO 53 W RMY 57
1/06 10/-2/4/-22/0.00/0.0/…/.. 43 WSW AERO 47 WSW RMY 47
1/07 14/-8/3/-23/0.00/0.0/…/.. 37 WNW AERO 35 WNW RMY N/A
1/08 33/14/24/-2/T/T/…/.. 40 S AERO 40 S RMY 42
1/09 40/25/33/+7/T/T/…/.. 37 W AERO 35 W RMY 33
1/10 36/20/28/+3/0.00/0.0/…/.. 30 W AERO 30 W RMY N/A
1/11 50/32/41/+16/0.00/0.0/…/.. 33 S AERO 32 S RMY 34
1/12 60/45/53/+28/…./0.0/…/.. 56 S AERO 56 S RMY 55
1/13 60/17/39/+14/T/0.0/…/.. 58 SSW AERO 60 SSW RMY 62

1/14 Low temp since midnight is 11F; normal low is now 17F

DAILY RECORDS FOR JANUARY 2018

01/04/18: NEW DAILY RECORD MAXIMUM SNOWFALL OF 16.5 INS.
PREVIOUS RECORD WAS 8.6 INS. SET IN 1923 AND
TIED IN 1942

01/07/18: DAILY RECORD LOW MINIMUM TEMPERATURE OF -8F,
PREVIOUS RECORD OF -7F WAS SET IN 1896

01/12/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 45F,
PREVIOUS RECORD OF 42F WAS SET IN 2017

DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 60F,
PREVIOUS RECORD OF 59F WAS SET IN 2017

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

RECORDS FOR JANUARY 14
HIGH 65F IN 1995
LOW -12F IN 1914
PRECIP 1.45 INS. IN 2008
SNOWFALL 10.3 INS. IN 2008
PEAK GUST 68 MPH WNW IN 1976, S IN 2005

RECORDS FOR JANUARY 15
HIGH 64F IN 1995
LOW -16F IN 1957 [RECORD FOR MONTH] PRECIP 2.63 INS. IN 1958
SNOWFALL 8.8 INS. IN 1983
PEAK GUST 69e MPH SE IN 1940

TODAY’S REPORT PREPARED BY: Robert Millette