Monday, October 19, 2020

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

MONDAY, OCTOBER 19, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

A NICE FALL DAY WITH LIMITED VISIBILITY
ATOP GREAT BLUE HILL….

Today we observed a limited visibility due to some
patchy ground fog, then a smoke layer later on in
the day. This yielded a visibility of only 30 miles
on average. Wind is northeasterly, with a max gust
of only 12 mph and an average speed barely exceeding
5 mph. Weather conditions are similar to yesterday,
with the sky being covered by primarily translucent
and high clouds.

The high so far today is 61F, 2 degrees above the daily
normal minimum of 59F. The low since midnight is 47F,
5 degrees above the normal low of 42F.

Today’s Observations:

7 A.M.
Weather: Broken cirrostratus
Temperature: 47F; Dew Point: 43F; Relative Humidity: 86%
Wind: ESE at 7 kts
Sea-level pressure: 30.41 ins. Hg: rising, then more slowly
Visibility: 25 miles, patchy fog
6-hr Max temp: 47F
6-hr Min temp: 47F
24-hr Precip: 0.00 ins.
BHO SA 1155 250 BKN 25 297/47/43/1207/041/ PTCHY F ALQDS/
8/008 52004 10047 20047

10 A.M.
Weather: Broken cirrostratus
Temperature: 57F; Dew Point: 46F; Relative Humidity: 67%
Wind: E at 4 kts, light and variable
Sea-level pressure: 30.42 ins. Hg: falling then rising
Visibility: 30 miles, thin smoke layer
3-hr Precip: 0.00 ins.
BHO SA 1455 250 BKN 30 299/57/46/0904/042/ THN K LYR ALQDS
WND L/V/ 8/008 51002

1 P.M.
Weather: Scattered cumulus and altocumulus, broken
cirrostratus
Temperature: 60F; Dew Point: 47F; Relative Humidity: 62%
Wind: NE at 7 kts
Sea-level pressure: 30.37 ins. Hg: falling steadily
Visibility: 30 miles, thin smoke layer
6-hr Max temp: 61F
6-hr Min temp: 47F
6-hr Precip: 0.00 inches
BHO SA 1755 55 SCT 140 SCT 250 BKN 30 283/60/47/0507/037/
THN K LYR ALQDS/ 8/178 58016 10061 20047

SUMMARY FOR SUNDAY, OCTOBER 18, 2020

TEMPERATURE (DEGREES F)
MAX…..60   NORMAL…..60
MIN…..46   NORMAL…..42
MEAN….53   NORMAL…..51

DEPARTURE FROM 30-YEAR NORMAL……………..+2
TOTAL DEPARTURE FOR THE MONTH…………….+42 [+2.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….12  DEPARTURE….. -2
TOTAL HEATING UNITS FOR THE MONTH…………159  DEPARTURE…..-47
TOTAL HEATING UNITS FOR THE SEASON………..257  DEPARTURE…..-91
TOTAL HEATING UNITS LAST SEASON TO DATE……292  DEPARTURE…..-35

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………. 0  DEPARTURE…… 0
TOTAL COOLING UNITS FOR THE MONTH…………. 1  DEPARTURE….. -4
TOTAL COOLING UNITS FOR THE SEASON………..831  DEPARTURE….+229
TOTAL COOLING UNITS LAST SEASON TO DATE……682  DEPARTURE….+149

PEAK WIND GUST FOR YESTERDAY (MPH)
420C/Official……………20 ESE AT  10:24 A.M.
AEROVANE (south tower)……21 ESE AT  10:21 A.M.
ASOS……………………22 ESE AT  10:42 A.M.
DAVIS #1………………..21 S   AT   9:41 A.M.
DAVIS #2 (south tower)……19 SE  AT   9:22 A.M.
RMY…………………….20
MERLIN………………….21
FASTEST MILE FOR YESTERDAY…………………15 ESE AT  10:24 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………15 ESE AT  10:24 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…………..16 ESE AT  10:24 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE…………..15 ESE AT  11:46 A.M.
AVERAGE WIND SPEED AND DIRECTION………….8.5 SE [205 total miles] ASOS………………….8.4
DAVIS #1………………9.0 SSE  [147 deg.] DAVIS #2………………9.3 SSE  [147 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE….-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….4.14  DEPARTURE….+1.46
ASOS…………..4.13
TOTAL PRECIPITATION FOR THE YEAR……….38.56  DEPARTURE….-3.20
ASOS………….39.34

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  75/56/66/+9/0.00/…/..             28 SW   AERO 28 SW   RMY N/A
10/02  63/49/56/-1/0.02/…/..             20 NW   AERO 21 NW   RMY 20
10/03  65/45/55/-1/0.00/…/..             19 WNW  AERO 19 WNW  RMY 19
10/04  65/45/55/-1/0.00/…/..             17 ESE  AERO 18 ESE  RMY 18
10/05  62/52/57/+1/0.00/…/..             17 ENE  AERO 17 ENE  RMY N/A
10/06  69/51/60/+5/0.00/…/..             28 S    AERO 28 S    RMY 29
10/07  73/50/62/+7/0.14/…/..             76 W    AERO 74 W    RMY 70  TSTM
10/08  61/42/52/-2/0.00/…/..             41 W    AERO 41 W    RMY N/A
10/09  60/37/49/-5/0.00/…/..             25 SSW  AERO 28 SSW  RMY N/A
10/10  75/52/64/+10/0.00/…/..            40 SSW  AERO 40 SSW  RMY 38
10/11  64/47/56/+3/0.00/…/..             32 NNW  AERO 35 NNW  RMY N/A
10/12  52/48/50/-3/T/…/..                28 E    AERO 27 E    RMY N/A
10/13  57/49/53/0/1.74/…/..              32 E    AERO 33 E    RMY N/A
10/14  67/47/57/+5/0.00/…/..             23 WNW  AERO 25 WNW  RMY N/A
10/15  71/50/61/+9/0.00/…/..             43 S    AERO 46 S    RMY 42
10/16  68/48/58/+7/…./…/..             28 S    AERO 30 S    RMY N/A
10/17  56/39/48/-3/…./…/..             35 WNW  AERO 40 WNW  RMY 37
10/18  60/46/53/+2/0.00/…/..             20 ESE  AERO 21 ESE  RMY 20

10/19 The low since midnight is 47F, the daily normal low is 42F

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

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

RECORDS FOR OCTOBER 20
HIGH 78F IN 1965,1984
LOW 24F IN 1972
PRECIP 7.10 INCHES IN 1996 (RECORD FOR MONTH)
SNOWFALL TRACE IN 1934,1943
PEAK GUST 63 MPH W IN 1966

TODAY’S REPORT PREPARED BY: Benjamin Turner