Monday, November 19, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, NOVEMBER 19, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

FOGGY, DRIZZLY AND COOL WITH LIGHT WINDS….

Fog reduced visibility to a 1/16th mile after the
7 A.M. observation, where the visibility was 5 miles.
We observed a partial undercast this morning, with
drizzly conditions persisting until noon. Precipitation
was very light, and only left a trace. Winds were light
and even calm at times, with a gust so far today of 12
mph. Winds were 6 mph on average or lower during the
observation period. The maximum temperature reached so
far today is 38F, 11 degrees below the daily normal of
49F. The low since midnight is 33F, same as the daily
normal minimum.

Today’s Observations:

7 A.M.
Weather: Overcast nimbostratus, partial undercast,
very light drizzle
Temperature: 35F; Dew Point: 35F; Wind: E at 8 kts
Sea-level pressure: 30.17 ins. Hg, falling steadily
Visibility: 5 miles, fog
6-hr Max temp: 35F
6-hr Min temp: 33F
24-hr Precip: 0.01 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 E30 OVC 5L-F 218/35/35/0908/017/ PARTIAL
UNDERCAST ALQDS L-CTD PCPN VRY LGT/ 8/02/ 70001 58009
10035 20033

10 A.M.
Weather: Very light drizzle
Temperature: 35F; Dew Point: 35F; Wind: NW at 2 kts,
Wind: Light and variable
Sea-level pressure: 30.15 ins. Hg, falling steadily
Visibility: 1/16 mile, fog
3-hr Precip: Trace
3-hr snowfall: 0.0 ins.
BHO SA 1455 W3 X 1/16L-F 209/35/35/3202/015/ L-CTD PCPN
VRY LGT WND L/V/ 8//// 6//// 58009

1 P.M.
Weather: Fog
Temperature: 35F; Dew Point: 35F; Wind: NW at 4 kts,
Wind: Light
Sea-level pressure: 30.09 ins. Hg, falling, then more rapidly
Visibility: 1/16 mile, fog
6-hr Max temp: 38F
6-hr Min temp: 34F
6-hr Precip: Trace
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 W3 X 1/16F 188/35/35/3004/009/ WND LGT/ 8////
6//// 56021 10038 20034

SUMMARY FOR SUNDAY, NOVEMBER 18, 2018

TEMPERATURE (DEGREES F)
MAX…..40   NORMAL…..49
MIN…..30   NORMAL…..33
MEAN….35   NORMAL…..41

DEPARTURE FROM 30-YEAR NORMAL……………………-6
TOTAL DEPARTURE FOR THE MONTH…………………..-11 [-0.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..30   DEPARTURE………+6
TOTAL HEATING UNITS FOR THE MONTH………….394   DEPARTURE……..+11
TOTAL HEATING UNITS FOR THE SEASON…………938   DEPARTURE………-8
TOTAL HEATING UNITS LAST SEASON TO DATE…….667   DIFFERENCE……+271

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..21 W   AT 12:41 A.M.
AERO…………………….21 W   AT 12:41 A.M.
ASOS…………………….21 W   AT 12:42 A.M.
DAVIS……………………21 WNW AT 12:14 A.M. RMY M
FASTEST MILE FOR YESTERDAY………………….16 W   AT 12:44 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….16 W   AT 12:42 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………17 W   AT 12:42 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..5.0 W
ASOS…………………..5.3
DAVIS………………….5.6 W [276 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01  DEPARTURE…….-0.15
ASOS…………..0.02
TOTAL PRECIPITATION FOR THE MONTH……….7.39  DEPARTURE…….+4.57
ASOS…………..7.69
TOTAL PRECIPITATION FOR THE YEAR……….60.43  DEPARTURE……+14.02
ASOS………….62.55

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 Low temp since midnight is 33F; normal low is 33F

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

RECORDS FOR NOVEMBER 19
HIGH 72 IN 1941
LOW 10 IN 1936
PRECIP 1.92 INCHES IN 1926
SNOWFALL 11.0 INS IN 1986
PEAK GUST 59e E IN 1945

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