Tuesday, November 20, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, NOVEMBER 20, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

FOG AND LIGHT RAIN WITH WIND INCREASING
THROUGHOUT THE DAY….

Visibility was reduced to a 1/16th mile due to fog
at 7 A.M. and 10 A.M. The fog broke up a little around
noontime, where 5 miles could be seen. Light rain
persisted since this morning, and left .30 inches
in the gauge at the 1 P.M. observation. We measured
.10 inches from the overnight rainfall. Light winds
this morning picked up gradually, and by 1 P.M, we
had a peak wind of 30 mph (26 kts). The maximum
temperature reached so far today is 38F, 11 degrees
below the daily normal of 49F. The low since midnight
is 34F, 2 degrees above the daily normal minimum of 32F.

Today’s Observations:

7 A.M.
Weather: Light rain and fog
Temperature: 36F; Dew Point: 36F; Wind: N at 8G14 kts
Sea-level pressure: 29.91 ins. Hg, falling steadily
Visibility: 1/16 miles, fog
6-hr Max temp: 36F
6-hr Min temp: 34F
24-hr Precip: 0.10 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 W3 X 1/16R-F 127/36/36/3608G14/991/ R-CTD/
8//// 55006 70010 10036 20034

10 A.M.
Weather: Light rain and fog
Temperature: 38F; Dew Point: 38F; Wind: NE at 11G19 kts
Sea-level pressure: 29.86 ins. Hg, falling steadily
Visibility: 1/16 mile, fog
3-hr Precip: 0.12 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 W3 X 1/16R-F 113/38/38/0511G19/986/ R-CTD/ 8////
56014 6012/

1 P.M.
Weather: Overcast nimbostratus, few stratus fractus in
all directions, light rain and fog
Temperature: 35F; Dew Point: 35F; Wind: NE at 12G22 kts,
Peak wind: 30 mph (26 kts) at 12:42 P.M.
Sea-level pressure: 29.79 ins. Hg, falling rapidly
Visibility: 5 miles, fog
6-hr Max temp: 38F
6-hr Min temp: 35F
6-hr Precip: 0.30 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 E10 OVC 5R-F 088/37/37/0412G22/979/ FEW STFRA ALQDS
R-CTD PK WND 0326/42/ 8/72/ 58025 6030/ 10038 20035

SUMMARY FOR MONDAY, NOVEMBER 19, 2018

TEMPERATURE (DEGREES F)
MAX…..38   NORMAL…..49
MIN…..33   NORMAL…..33
MEAN….36   NORMAL…..41

DEPARTURE FROM 30-YEAR NORMAL……………………-5
TOTAL DEPARTURE FOR THE MONTH…………………..-16 [-0.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..29   DEPARTURE………+5
TOTAL HEATING UNITS FOR THE MONTH………….423   DEPARTURE……..+16
TOTAL HEATING UNITS FOR THE SEASON…………967   DEPARTURE………-3
TOTAL HEATING UNITS LAST SEASON TO DATE…….686   DIFFERENCE……+281

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..16 E   AT 5:20 A.M.
AERO…………………….14 E   AT 5:21 A.M.
ASOS…………………….15 E   AT 5:17 A.M.
DAVIS……………………15 E   AT 5:00 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….13 E   AT 5:22 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….13 E   AT 5:00 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………14 E   AT 5:21 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..4.9 NW
ASOS…………………..5.6
DAVIS………………….5.4 NE [38 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.10  DEPARTURE…….-0.06
ASOS…………..0.07
TOTAL PRECIPITATION FOR THE MONTH……….7.49  DEPARTURE…….+4.51
ASOS…………..7.77
TOTAL PRECIPITATION FOR THE YEAR……….60.53  DEPARTURE……+13.96
ASOS………….62.63

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.1
TOTAL SNOWFALL FOR THE MONTH…………….7.5  DEPARTURE……..+6.7
TOTAL SNOWFALL FOR THE SEASON……………7.5  DEPARTURE……..+6.4

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 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

11/01 65/49/57/+11/…./006/01         25 SSW AERO 24 SSW RMY N/A
11/02 65/52/59/+13/…./000/00         37 SSW AERO 41 SSW RMY N/A
11/03 64/42/53/+7/…./144/24          59 W   AERO 60 W   RMY 58
11/04 52/37/45/0/…./570/96           31 W   AERO 30 W   RMY N/A
11/05 49/40/45/0/…./000/00           30 ENE AERO 29 ENE RMY 28
11/06 58/45/52/+7/…./000/00          29 SSW AERO 29 SSW RMY 31
11/07 60/50/55/+10/…./456/98         30 WSW AERO 30 WSW RMY 32
11/08 52/37/45/+1/…./234/78          29 WNW AERO 26 WNW RMY 23
11/09 48/34/41/-3/…./000/00          43 E   AERO 40 E   RMY 42
11/10 45/32/39/-5/…./576/100         45 W   AERO 47 WNW RMY 46
11/11 43/30/37/-6/0.00/462/80          32 WNW AERO 30 W   RMY 32
11/12 48/27/38/-5/0.00/000/00          18 SW  AERO 18 SW  RMY N/A
11/13 52/37/45/+2/…./458/80          44 WNW AERO 44 WNW RMY 48
11/14 37/20/29/-13/…./000/00         45 WNW AERO 50 WNW RMY 50
11/15 30/19/25/-17/…./…/..         33 E   AERO 36 E   RMY N/A
11/16 41/30/36/-6/…./…/..          43 E   AERO 44 ENE RMY N/A
11/17 45/34/40/-1/0.00/…/..          28 W   AERO 27 W   RMY 28
11/18 40/30/35/-6/0.00/…/..          21 W   AERO 21 W   RMY M
11/19 38/33/36/-5/…./…/..          16 E   AERO 14 E   RMY N/A

11/20 Low temp since midnight is 34F; normal low is 32F

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

RECORDS FOR NOVEMBER 21
HIGH 69 IN 1931
LOW 10 IN 1888
PRECIP 2.60 INCHES IN 1950
SNOWFALL 4.0 INS IN 1929
PEAK GUST 69 NW IN 1989

RECORDS FOR NOVEMBER 20
HIGH 72 IN 1953
LOW 10 IN 1894
PRECIP 2.78 INS IN 1988
SNOWFALL 3.0 INS IN 1897
PEAK GUST 73e S IN 1950

TODAY’S REPORT PREPARED BY: Benjamin Turner