Monday, October 21, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, OCTOBER 21, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDY START GIVES WAY TO SUNNY SKIES, BUT REMAINING CHILLY…

After an abundance of clouds this morning following the light
rain overnight associated with the remains of Nestor, clouds
have cleared this afternoon leaving us with mainly sunny skies.
Visibility this morning was only around 20 miles, but has since
improved to around 60 miles this afternoon.

A fresh northeast wind has kept temperatures on the cooler side
with the high so far today only making it to 59 degrees, which
is exactly the normal high for the day. Overnight low was 50,
which is 9 degrees above the normal low of 41 degrees.

Today’s Observations:

7 A.M.
Weather: Broken stratus fractus, broken stratocumulus, broken altocumulus
Temperature: 51F; Dew Point: 48F; Wind: NNE at 9 kts, gusting to 16 kts
Sea-level pressure: 30.09 ins. Hg, rising, then rising more rapidly
Visibility: 20 miles, 15 miles to the southeast
6-hr Max temp: 51F
6-hr Min temp: 50F
24-hour Precip.: 0.01 in.
BHO SA 1155 10 SCT E50 BKN 140 BKN 20 190/51/48/0209G16/009/
VSBY 15 SE/ 8/770 53017 6001 70001 10051 20050

10 A.M.
Weather: Brocken stratocumulus
Temperature: 58F; Dew Point: 48F; Wind: NE at 14 kts, gusting to 20 kts
Sea-level pressure: 30.10 ins. Hg, falling then more slowly
Visibility: 40 miles
3-hour Precip.: 0.00 in.
BHO SA 1455 E20 BKN 40 193/58/48/0514G20/010/ WND 01V08/
8/500 55003

1 P.M.
Weather: Clear, few stratocumulus all quadrants
Temperature: 58F; Dew Point: 46F; Wind: NE at 13 kts, gusting to 20 kts
Sea-level pressure: 30.12 ins. Hg, rising, then more slowly
Visibility: 60 miles
6-hr Max temp: 59F
6-hr Min temp: 51F
BHO SA 1755 CLR 60 201/58/46/0513G20/012/ FEW SC ALQDS/ 8/500
51008 10059 20051

SUMMARY FOR SUNDAY, OCTOBER 20, 2019

TEMPERATURE (DEGREES F)
MAX…..60   NORMAL…..59
MIN…..43   NORMAL…..41
MEAN….52   NORMAL…..50

DEPARTURE FROM 30-YEAR NORMAL…………………+2
TOTAL DEPARTURE FOR THE MONTH…………………+2 [ -0.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………13  DEPARTURE………-2
TOTAL HEATING UNITS FOR THE MONTH…………..230  DEPARTURE………-6
TOTAL HEATING UNITS FOR THE SEASON………….323  DEPARTURE……..-55
TOTAL HEATING UNITS LAST SEASON TO DATE……..290  DEPARTURE……..+33

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……….0
TOTAL COOLING UNITS FOR THE MONTH…………….2  DEPARTURE………-3
TOTAL COOLING UNITS FOR THE SEASON………….682  DEPARTURE……..+80
TOTAL COOLING UNITS LAST SEASON TO DATE……..874  DEPARTURE…….-192

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..14 NE  AT 12:33 A.M.
AERO…………………….16 NE  AT 12:55 A.M.
ASOS…………………….13 NNE AT 12:33 A.M.
DAVIS……………………14 E   AT  7:41 A.M. RMY 19
FASTEST MILE FOR YESTERDAY………………….11 NE  AT 12:32 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….12 NE  AT  4:55 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………12 NNE AT 12:20 A.M.
AVERAGE WIND SPEED AND DIRECTION……………5.9 NE
ASOS……………………6.7
DAVIS…………………..6.5 E [080 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01  DEPARTURE……-0.14
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….4.63  DEPARTURE……+1.65
ASOS…………..4.89
TOTAL PRECIPITATION FOR THE YEAR……….43.05  DEPARTURE……+0.98
ASOS………….43.12

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  67/52/60/+3/0.06/…/..               28 SW  AERO 25 SSW RMY 29
10/02  74/49/62/+5/0.42/…/..               30 ENE AERO 25 ENE RMY 28
10/03  51/46/49/-7/…./…/..               28 ENE AERO 26 ENE RMY N/A
10/04  59/40/50/-6/…./…/..               38 NNW AERO 38 NNW RMY 38
10/05  58/35/47/-9/0.00/…/..               21 N   AERO 18 SSW RMY N/A
10/06  65/44/55/0/0.00/…/..                36 SSW AERO 35 SSW RMY N/A
10/07  77/57/67/+12/0.12/…/..              47 SSW AERO 46 SSW RMY 49
10/08  60/52/56/+2/T/…/..                  22 NE  AERO 18 NW  RMY N/A
10/09  55/49/52/-2/…./…/..               43 NE  AERO 37 NE  RMY 44
10/10  54/47/51/-3/…./…/..               41 NE  AERO 37 NE  RMY 42
10/11  52/48/50/-3/…./000/00               41 NE  AERO 39 NE  RMY 41
10/12  52/49/51/-2/…./…/..               39 NE  AERO 37 NE  RMY N/A
10/13  66/48/57/+4/…./…/..               18 WNW AERO 17 WNW RMY 18
10/14  67/51/59/+7/…./…/..               18 WSW AERO 17 WSW RMY N/A
10/15  61/43/52/0/…./…/..                18 NNW AERO 17 NNW RMY N/A
10/16  61/45/53/+2/…./…/..               58 ESE AERO 58 ESE RMY N/A
10/17  60/46/53/+2/…./…/..               61 E   AERO 63 E   RMY N/A
10/18  57/41/49/-2/…./…/..               29 WNW AERO 32 W   RMY 32
10/19  58/36/47/-3/…./…/..               18 NW  AERO 18 NW  RMY 19
10/20  60/43/52/+2/T/…/..                  14 NE  AERO 16 NE  RMY N/A

10/21 The low since midnight is 50F, normal daily minimum is 41F

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

RECORDS FOR OCTOBER 21
HIGH 79F IN 1979
LOW 24F IN 1974
PRECIP 2.39 INCHES IN 1944
SNOWFALL TRACE IN 1895,1907,1940
PEAK GUST 69e MPH S IN 1976

RECORDS FOR OCTOBER 22
HIGH 85F IN 1979
LOW 22F IN 1940
PRECIP 2.38 INCHES IN 2014
SNOWFALL TRACE IN 1969, 2010
PEAK GUST 67 MPH ESE IN 1988

TODAY’S REPORT PREPARED BY: Matt Douglas and Ann Murphy