Thursday, October 18, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, OCTOBER 18, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

COLD TEMPERATURES AND HIGH PRESSURE WITH A PERSISTING
WESTERLY WIND….

Pressure rose steadily throughout the observation period, with 1 P.M.
marking a trend towards lower readings.  Meanwhile, high pressure has
enforced clear skies with just a few cumulus clouds lingering in the
sky throughout the day.  Temperatures have remained cold, with the
low registering just before sunrise this morning.  Temperatures
remain below seasonal averages despite the absence of cloud cover.
The high so far today is 44 F with the low running at 33 F.
These readings are well below the average max of 60 F and the
average min of 42 F. Winds remain elevated, with westerlies over
10 mph enduring into the afternoon.

Today’s Observations:

7 A.M.
Weather: Few distant cumulus in all directions
Temperature: 35F; Dew Point: 30F; Wind: WNW at 13G21 kts
Sea-level pressure: 30.16 ins. Hg, rising steadily
Visibility: 75 miles
6-hr Max temp: 39F
6-hr Min temp: 33F
24-hr Precip: 0.01 ins.
BHO SA 1155 CLR 75 213/35/30/2913G21/016/ FEW DSNT CU ALQDS/
8/100 70001 52034 10039 20033

10 A.M.
Weather: Few cumulus in all directions
Temperature: 40F; Dew Point: 18F; Wind: W at 11G20 kts,
Peak wind: 31 mph (27 kts) W at 9:25 A.M.
Sea-level pressure: 30.21 ins. Hg, rising steadily
Visibility: 75 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 75 230/40/18/2811G20/021/ FEW CU ALQDS PK WND 2827/25/
8/100 70001 51017

1 P.M.
Weather: Few distant cumulus in all directions
Temperature: 44F; Dew Point: 21F; Wind: W at 15G20 kts,
Sea-level pressure: 30.19 ins. Hg, dropping slowly
Visibility: 80 miles
6-hr Max temp: 44F
6-hr Min temp: 35F
6-hr Precip: 0.00 ins.
BHO SA 1755 CLR 80 225/44/21/2615G20/019/ FEW DSNT CU ALQDS/
8/100 58005 10044 20035

SUMMARY FOR WEDNESDAY, OCTOBER 17, 2018

TEMPERATURE (DEGREES F)
MAX…..60   NORMAL…..60
MIN…..39   NORMAL…..42
MEAN….50   NORMAL…..51

DEPARTURE FROM 30-YEAR NORMAL…………………..-1
TOTAL DEPARTURE FOR THE MONTH………………….+48 [+2.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..15   DEPARTURE………+1
TOTAL HEATING UNITS FOR THE MONTH………….147   DEPARTURE……..-45
TOTAL HEATING UNITS FOR THE SEASON…………234   DEPARTURE…….-100
TOTAL HEATING UNITS LAST SEASON TO DATE…….181   DIFFERENCE…….+53

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0  DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH…………..11  DEPARTURE……….+6
TOTAL COOLING UNITS FOR THE SEASON…………874  DEPARTURE……..+272
TOTAL COOLING UNITS LAST SEASON TO DATE…….727  DIFFERENCE…….+147

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..48 W   AT 4:12   P.M.
AERO…………………….50 W   AT 4:15   P.M.
ASOS…………………….52 WNW AT 4:15   P.M.
DAVIS……………………52 NW  AT 4:15   P.M. RMY 53
FASTEST MILE FOR YESTERDAY………………….39 W   AT 4:12   P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….36 WNW AT 4:15   P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………39 WNW AT 4:15   P.M.
AVERAGE WIND SPEED AND DIRECTION……………14.8 W
ASOS……………………14.3
DAVIS…………………..15.1 W [266 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01  DEPARTURE……-0.14
ASOS…………..0.03
TOTAL PRECIPITATION FOR THE MONTH……….2.76  DEPARTURE……+0.24
ASOS…………..2.76
TOTAL PRECIPITATION FOR THE YEAR……….49.96  DEPARTURE……+8.54
ASOS………….51.68

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

10/01 65/53/59/+2/…./042/06         21 ENE AERO 18 SSW RMY N/A
10/02 64/53/59/+2/…./000/00         33 S   AERO 32 S   RMY 35 TSTM
10/03 60/52/56/0/…./000/00          18 NNE AERO 14 NNE RMY 14
10/04 69/57/63/+7/…./209/30         29 SSW AERO 29 SSW RMY 32
10/05 64/47/56/0/…./638/92          25 NE  AERO 21 NE  RMY 24
10/06 64/45/55/0/0.00/276/40          23 SSW AERO 23 SSW RMY 25
10/07 75/56/66/+11/…./076/11        28 NE  AERO 24 ENE RMY 27
10/08 56/53/55/+1/…./000/00         22 ENE AERO 20 ENE RMY N/A
10/09 75/56/66/+12/…./211/31        26 WSW AERO 28 SW  RMY 29
10/10 82/65/74/+20/…./496/73        24 WSW AERO 23 WSW RMY 25
10/11 70/56/63/+10/…./…/..        48 NNE AERO 47 NNE RMY 50
10/12 59/44/52/-1/…./…/..         32 NW  AERO 32 NW  RMY 33
10/13 49/40/45/-8/…./…/..         21 WNW AERO 20 WNW RMY 20
10/14 55/37/46/-6/…./…/..         21 W   AERO 18 W   RMY 21
10/15 66/44/55/+3/…./…/..         46 W   AERO 46 W   RMY N/A
10/16 56/41/49/-2/…./…/..         48 W   AERO 48 W   RMY N/A
10/17 60/39/50/-1/…./…/..         48 W   AERO 50 W   RMY 53

10/18 Low temp since midnight is 33F; normal low is 42F

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

RECORDS FOR OCTOBER 18
HIGH 82F IN 1908
LOW 26F IN 1939
PRECIP 2.79 INCHES IN 1975
SNOWFALL 3.0 INCHES IN 2009
PEAK GUST 66 MPH S IN 1967

RECORDS FOR OCTOBER 19
HIGH 81F IN 1945
LOW 21F IN 1922
PRECIP 3.64 INCHES IN 1932
SNOWFALL 1.0 INCHES IN 1972
PEAK GUST 66 MPH SSW IN 1967

TODAY’S REPORT PREPARED BY: Nate Iannuccillo & Benjamin Turner