Friday, January 18, 2019

| January 18, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JANUARY 18, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

SIGNIFICANT WARMING WITH DECREASING CLOUDS THROUGHOUT
THE DAY….

We observed a temperature change of almost 18 degrees
since this morning, with an overnight low of 21F and
a high of 38F. The high so far today is 5 degrees above
the normal maximum of 33F. The low since midnight is
4 degrees above the daily normal minimum of 17F. Clouds
decreased as the day went on with overcast skies this
morning becoming partly cloudy following the 1 PM observation.
Pressure has dropped steadily during the day, dropping 5 mb
since 4 A.M. Wind was steady from the southeast, with an
average speed of 10 mph. Visibility was 40 miles at each
observation, with a thin smoke layer along the horizon at
each observation.

Today’s Observations:

7 A.M.
Weather: Broken cirrostratus, few stratocumulus
Temperature: 24F; Dew Point: 19F; Wind: ESE at 10 kts
Sea-level pressure: 30.14 ins. Hg, falling steadily
Visibility: 40 miles,
6-hr Max temp: 24F
6-hr Min temp: 21F
24-hr Precip: 0.00
24-hr snowfall: 0.0
Snow depth: 0 ins.
BHO SA 1155 E250 BKN 40 208/24/19/1210/014/ FEW SC ALQDS/
8/508 56014 10024 20021

10 A.M.
Weather: Broken cumulus, broken altostratus,
few cumulus offshore, smoke plume WNW
Temperature: 32F; Dew Point: 27F; Wind: SE at 11G14 kts
Sea-level pressure: 30.13 ins. Hg, falling steadily
Visibility: 40 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E45 BKN 180 BKN 40 203/32/27/1311G14/013/
FEW CU OFFSHR K PLUME WNW K LYR ALG HRZN/ 8/110 58005

1 P.M.
Weather: Scattered cumulus, broken altostratus
Temperature: 38F; Dew Point: 27F; Wind: S at 07 kts,
Wind: Light and variable
Sea-level pressure: 30.04 ins. Hg, falling rapidly
Visibility: 40 miles
6-hr Max temp: 38F
6-hr Min temp: 24F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 E40 SCT 150 BKN 40 173/38/27/1907/004/
DSNT HZ ALQDS/ 8/170 58030 10038 20024

SUMMARY FOR THURSDAY, JANUARY 17, 2019

TEMPERATURE (DEGREES F)
MAX…..27   NORMAL…..33
MIN…..13   NORMAL…..17
MEAN….20   NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL……………………-5
TOTAL DEPARTURE FOR THE MONTH…………………..+45 [+2.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..45   DEPARTURE………+5
TOTAL HEATING UNITS FOR THE MONTH………….624   DEPARTURE……..-44
TOTAL HEATING UNITS FOR THE SEASON………..2920   DEPARTURE……..-52
TOTAL HEATING UNITS LAST SEASON TO DATE……2852   DIFFERENCE…….+68

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..30  NNW AT 1:39 A.M.
AERO…………………….28  NW  AT 1:42 A.M.
ASOS…………………….31  NW  AT 1:41 A.M.
DAVIS……………………31  NW  AT 1:40 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….24  NW  AT 1:37 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23  NW  AT 1:42 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………25  NW  AT 1:42 A.M.
AVERAGE WIND SPEED AND DIRECTION……………8.4 NNW
ASOS……………………8.1
DAVIS…………………..8.9 NNW [327 deg.]

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……….2.14  DEPARTURE…….-0.29
ASOS…………..2.15
TOTAL PRECIPITATION FOR THE YEAR………..2.14  DEPARTURE…….-0.29
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……..-9.6
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 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 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

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

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

Category: Daily Discussions

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