Thursday, November 21, 2019

| November 21, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, NOVEMBER 21, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

A MILD AND FAIR WEATHER DAY FOLLOWING THE
RAINY STRETCH….

We observed almost cloudless skies today, along with an
average visibility of 75 miles. We measured 0.16 inches
from yesterdays rainfall, mixing in with a little snow
early yesterday afternoon. A layer of glaze was seen
this morning, quickly melting after the 7 A.M observation.
Wind has been light, shifting from north to west around
noontime.

The high so far today is 45F, which is 3 degrees above
the daily normal maximum of 48F. The low since midnight
is 30F, which is 2 degrees below the normal minimum of 32F.

Today’s Observations:

7 A.M.
Weather: Few distant cumulus and altocumulus offshore
Temperature: 30F; Dew Point: 29F; Wind: NW at 12 kts
Sea-level pressure: 30.13 ins. Hg, rising steadily
Visibility: 65 miles
6-hr Max temp: 33F
6-hr Min temp: 30F
24-hr Precip:  0.16 ins.
24-hr Snowfall: Trace
BHO SA 1155 CLR 65 203/30/29/3312/013/ FEW DSNT CU/AC
OFFSHR/ 8/180 70016 53023 10033 20030

10 A.M.
Weather: Few distant cumulus
Temperature: 39F; Dew Point: 32F; Wind: NW at 7 kts
Sea-level pressure: 30.16 ins. Hg, rising steadily
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 70 212/39/32/3307/016/ FEW DSNT CU ALQDS/
8/100 51009

1 P.M.
Weather: Few distant cumulus
Temperature: 45F; Dew Point: 33F; Wind: W at 3 kts,
Wind: Light and variable
Sea-level pressure: 30.10 ins. Hg, falling steadily
Visibility: 80 miles
6-hr Max temp: 45F
6-hr Min temp: 30F
3-hr Precip: 0.00 ins.
BHO SA 1755 CLR 80 195/45/33/2803/010/ FEW DSNT CU ALQDS
WND L/V/ 8/100 58017 10045 20030

SUMMARY FOR WEDNESDAY, NOVEMBER 20, 2019

TEMPERATURE (DEGREES F)
MAX…..38   NORMAL…..49
MIN…..33   NORMAL…..32
MEAN….36   NORMAL…..40

DEPARTURE FROM 30-YEAR NORMAL………………. -4
TOTAL DEPARTURE FOR THE MONTH……………….-95 [-5.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………29  DEPARTURE……..+4
TOTAL HEATING UNITS FOR THE MONTH…………..541  DEPARTURE……+109
TOTAL HEATING UNITS FOR THE SEASON………….981  DEPARTURE…….-14
TOTAL HEATING UNITS LAST SEASON TO DATE……..996  DEPARTURE…….-15

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..20 NW  AT 11:21 P.M.
AERO…………………….18 NW  AT 10:21 P.M
ASOS…………………….21 NW  AT 11:23 P.M.
DAVIS……………………21 NW  AT 11:23 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….13 NW  AT 11:54 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….14 NW  AT 11:56 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………15 NW  AT 11:54 P.M.
AVERAGE WIND SPEED AND DIRECTION……………8.3 NNW
ASOS……………………9.0
DAVIS…………………..8.7 NNW [345 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.16  DEPARTURE……+0.00
ASOS…………..0.20
TOTAL PRECIPITATION FOR THE MONTH……….1.70  DEPARTURE……-1.45
ASOS…………..1.77
TOTAL PRECIPITATION FOR THE YEAR……….47.04  DEPARTURE……+0.11
ASOS………….47.24

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……..Trace  DEPARTURE…….-0.1
TOTAL SNOWFALL FOR THE MONTH…………….0.1  DEPARTURE…….-0.8
TOTAL SNOWFALL FOR THE SEASON……………0.1  DEPARTURE…….-1.1

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  38/33/36/-4/…./T/…/..              20 NW  AERO 18 NW  RMY 21

11/21 The low since midnight is 30F, 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 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 22
HIGH 70 IN 1931
LOW 9 IN 2018
PRECIP 1.78 INS IN 2005
SNOWFALL 9.0 INS IN 1971
PEAK GUST 70e SE IN 1945

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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