Saturday, January 19, 2019

| January 19, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JANUARY 19, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDS MOVE IN OVERHEAD DESPITE DRY CONDITIONS…

While we anticipate tonight’s forecast storm, weather conditions today
have yet to display some of the traditional signs of an impending storm.
So far, pressure has stayed relatively high, with station pressure
hovering around 1000 MB around the time of the 1 P.M. observation.
Additionally, conditions have stayed fairly dry, with relative humidity
falling throughout the morning, with 57% observed at 1 P.M.  In spite
of these trends, cloud activity may provide a bigger frame of reference
in terms of regional weather patterns.  In this capacity, the evolution
of today’s cloud cover has been noteworthy.  The 7 A.M. observation was
striking, with clear skies overhead, but significant cloud cover in all
directions when peering into the distance.  Eventually, bands of
altocumulus began to fill in around 10 A.M. until the overcast layer of
altostratus was reached just after noon.  Wind speeds have been no more
than a light breeze throughout the observation period, with the most
notable change reflected in the shift from northerly to northeasterly winds.

Today’s Observations:

7 A.M.
Weather: Few distant altocumulus in all directions, few distant
altostratus in all directions, few distant cirrocumulus in all directions
Temperature: 25F; Dew Point: 18F; Wind: NNE at 7 kts
Sea-level pressure: 30.25 ins. Hg, rising, then more rapidly
Visibility: 35 miles
6-hr Max temp: 28F
6-hr Min temp: 25F
24-hr Precip: 0.00
24-hr snowfall: 0.0
Snow depth: 0 ins.
BHO SA 1155 CLR 35 243/25/18/0207/025/ FEW DSNT AC ALQDS FEW
DSNT AS ALQDS FEW DSNT CC ALQDS/ 8/029/ 53021 10028 20025

10 A.M.
Weather: Few altocumulus, few cirrocumulus, few distant altostratus in all directions
Temperature: 29F; Dew Point: 16F; Wind: NNE at 7 kts
Sea-level pressure: 30.30 ins. Hg, rising, then more rapidly
Visibility: 50 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 50 262/29/16/0307/030/ FEW AC FEW CC FEW DSNT
AS ALQDS/ 8/059/ 53019

1 P.M.
Weather: Overcast altostratus
Temperature: 28F; Dew Point: 15F; Wind: ENE at 6 kts,
Wind: Light and variable
Sea-level pressure: 30.27 ins. Hg, increasing, then decreasing
Visibility: 45 miles
6-hr Max temp: 31F
6-hr Min temp: 24F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 E35 OVC 45 249/28/15/0706/027/ WND LGT/ 8/02// 58013
10031 20024

SUMMARY FOR FRIDAY, JANUARY 18, 2019

TEMPERATURE (DEGREES F)
MAX…..40   NORMAL…..33
MIN…..21   NORMAL…..17
MEAN….31   NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL……………………+6
TOTAL DEPARTURE FOR THE MONTH…………………..+51 [+2.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..34   DEPARTURE………-6
TOTAL HEATING UNITS FOR THE MONTH………….658   DEPARTURE……..-50
TOTAL HEATING UNITS FOR THE SEASON………..2954   DEPARTURE……..-58
TOTAL HEATING UNITS LAST SEASON TO DATE……2894   DIFFERENCE…….+60

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..18  WNW AT 10:09 P.M.
AERO…………………….18  WNW AT 10:09 P.M.
ASOS…………………….19  WNW AT 10:10 P.M.
DAVIS……………………20  WNW AT 10:10 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….13  W   AT  5:25 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….14  WNW AT  9:13 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………14  W   AT  5:33 P.M.
AVERAGE WIND SPEED AND DIRECTION……………9.0 SE
ASOS……………………8.7
DAVIS…………………..9.6 S [188 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.14  DEPARTURE…….-0.43
ASOS…………..2.15
TOTAL PRECIPITATION FOR THE YEAR………..2.14  DEPARTURE…….-0.43
ASOS…………..2.15

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…….-10.1
TOTAL SNOWFALL FOR THE SEASON……………7.7  DEPARTURE…….-17.9

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 27/13/20/-5/0.00/0.0/…/..         30 NNW AERO 28 NW  RMY N/A
01/18 40/21/31/+6/0.00/0.0/…/..        18 WNW AERO 18 WNW RMY N/A

01/19 Low temp since midnight is 25F; normal low is 17F

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

RECORDS FOR JANUARY 19
HIGH 59F IN 1973
LOW -11F IN 1887
PRECIP 2.34 INS. IN 1936
SNOWFALL 10.5 INS. IN 1936
PEAK GUST 93e MPH WNW IN 1943

RECORDS FOR JANUARY 20
HIGH 59F IN 1951
LOW -9F IN 1901
PRECIP 1.95 INS. IN 1978
SNOWFALL 19.0 INS. IN 1978
PEAK GUST 76e MPH NE IN 1978

TODAY’S REPORT PREPARED BY: Nate Iannuccillo

Category: Daily Discussions

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