Wednesday, November 20, 2019

| November 20, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, NOVEMBER 20, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

A CLOUDY, FOGGY, AND RAINY STREAK CONTINUES…

Mist and light rain is today’s theme yet again, with it being the
4th consecutive day of precipitation. We recorded 0.07″ of rain
at 7 AM, bringing our 24hr total to 0.17″. Visibility has held at
around a 1/16th mile throughout most of the day increasing to 25
miles at the 1 PM observation. Winds have increased out of the
north with a max daily gust so far of 18 MPH. Yesterday however,
the peak gust clocked in at only 12 MPH. The average daily speed
was only 2.8 MPH!

Rain began mixing with snow at around 12:35 PM, but no
accumulation observed at 1 PM observation with only a trace.

The high so far today is 37F, which is 12 degrees below the daily
normal maximum of 49F. The low since midnight is 37F, which is 5
degrees above the normal minimum of 32F.

Today’s Observations:

7 A.M.
Weather: Vertical visibility 300 feet, sky obscured, light drizzle
and fog
Temperature: 37F; Dew Point: 37F; Wind: N at 9 kts
Sea-level pressure: 29.86 ins. Hg, rising, then falling
Visibility: 1/16 mile, fog
6-hr Max temp: 37F
6-hr Min temp: 37F
24-hr Precip:  0.17 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 W3 X 1/16L-F 112/37/37/3509/986/
L-CTD/ 8//// 51008 6007/ 70017 10037 20037

10 A.M.
Weather: Vertical visibility 300 feet, sky obscured, light drizzle
and fog
Temperature: 37F; Dew Point: 37F; Wind: N at 8G14 kts,
Sea-level pressure: 29.90 ins. Hg, rising, then falling
Visibility: 1/16 mile, fog
3-hr Precip: 0.02 ins.
BHO SA 1455 W3 X 1/16L-F 125/37/37/0108G14/990/ L-CTD/
8//// 51013 6002/

1 P.M.
Weather: Overcast Stratus, light drizzle and light snow
Temperature: 35F; Dew Point: 35F; Wind: N at 8 kts
Sea-level pressure: 29.89 ins. Hg, falling, then rising
Visibility: 25 miles, fog
Snow: Trace (beginning at 12:35 PM)
6-hr Max temp: 37F
6-hr Min temp: 35F
3-hr Precip: 0.03 ins.
BHO SA 1755 E12 OVC 25L-S- 121/35/35/3508/989/
L-CTD S-B35/ 8/6// 55004 6003/ 10037 20035

SUMMARY FOR TUESDAY, NOVEMBER 19, 2019

TEMPERATURE (DEGREES F)
MAX…..42   NORMAL…..49
MIN…..36   NORMAL…..33
MEAN….39   NORMAL…..41

DEPARTURE FROM 30-YEAR NORMAL………………. -2
TOTAL DEPARTURE FOR THE MONTH……………….-91 [-5.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………26  DEPARTURE……..+2
TOTAL HEATING UNITS FOR THE MONTH…………..512  DEPARTURE…….+105
TOTAL HEATING UNITS FOR THE SEASON………….952  DEPARTURE……..-18
TOTAL HEATING UNITS LAST SEASON TO DATE……..966  DEPARTURE……..-14

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..12 SSW AT 12:30 A.M.
AERO……………………..9 NNW AT  3:27 A.M
ASOS…………………….12 N   AT  1:10 A.M.
DAVIS……………………11 N   AT  1:04 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………..8 N   AT 11:03 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………..9 N   AT 10:58 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………….9 NNE AT 10:52 P.M.
AVERAGE WIND SPEED AND DIRECTION……………2.8 S
ASOS……………………3.4
DAVIS…………………..3.5 NNW [347 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.17  DEPARTURE……+0.01
ASOS…………..0.20
TOTAL PRECIPITATION FOR THE MONTH……….1.54  DEPARTURE……-1.45
ASOS…………..1.57
TOTAL PRECIPITATION FOR THE YEAR……….46.88  DEPARTURE……+0.11
ASOS………….47.04

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……. 0.0
TOTAL SNOWFALL FOR THE MONTH…………….0.1  DEPARTURE…….-0.7
TOTAL SNOWFALL FOR THE SEASON……………0.1  DEPARTURE…….-0.9

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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  67/35/51/+5/…./0.0/…/..            67 S   AERO M  M   RMY N/A
11/02  50/31/41/-5/0.00/0.0/…/..            17 WNW AERO 14 W   RMY N/A
11/03  53/35/44/-2/0.00/0.0/…/..            25 WSW AERO 23 W   RMY 26
11/04  53/33/43/-2/0.00/0.0/…/..            24 S   AERO 20 S   RMY 24
11/05  54/44/49/+4/0.33/0.0/…/..            22 S   AERO 18 WNW RMY 28
11/06  51/36/44/-1/0.00/0.0/…/..            28 WSW AERO 23 W   RMY 27
11/07  55/38/47/+2/0.27/0.0/…/..            30 S   AERO 26 SSW RMY 32
11/08  38/23/31/-13/0.00/0.0/…/..           38 NW  AERO 37 WNW RMY 44
11/09  39/20/30/-14/0.00/0.0/…/..           22 S   AERO 18 S   RMY N/A
11/10  51/30/41/-3/0.00/0.0/…/..            30 SW  AERO 30 SW  RMY 31
11/11  52/39/46/+3/T/0.0/…/..               23 NE  AERO 22 NE  RMY 23
11/12  42/20/31/-12/0.08/0.1/…/..           37 WNW AERO 37 WNW RMY 41
11/13  28/15/22/-21/0.00/0.0/…/..           32 WNW AERO 32 WNW RMY 35
11/14  36/17/28/-14/0.00/0.0/…/..           18 SW  AERO 17 SW  RMY 20
11/15  51/32/42/0/0.00/0.0/…/..             25 WNW AERO 25 WNW RMY N/A
11/16  35/22/29/-13/0.00/0.0/…/..           35 NNW AERO 35 NNW RMY N/A
11/17  40/21/31/-10/T/T/…/..                28 ENE AERO 27 ENE RMY 29
11/18  36/32/34/-7/…./0.0/…/..            28 NNE AERO 29 N   RMY 31
11/19  42/36/39/-2/…/0.0/…/..             12 SSW AERO  9 NNW RMY N/A

11/20 The low since midnight is 37F, daily normal minimum is 32F

DAILY RECORDS FOR NOVEMBER

11/13/19: DAILY RECORD LOW MAXIMUM TEMPERATURE OF 28F,
BREAKS PREVIOUS RECORD OF 30F SET IN 1920.
It was also the third earliest maximum temperature
colder than 30F on record, behind only 28F on 11/8/1894
and 29F on 11/12/1894.

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: Andrew Swanson

Category: Daily Discussions

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