Wednesday, November 27, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, NOVEMBER 27, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

MILD TEMPERATURES CONTINUE WITH LIMITED VISIBILITY….

Clouds have ruled the day today as a storm system over the
Mid West heads to our northwest and the associated frontal
system approaches the region.

Ahead of this front, temperatures remain on the mild side
with the high so far reaching 50 degrees for the third day
in a row.

A decent inversion early this morning allowed for low-lying
areas to radiate down into the 30s, meanwhile up here on the
summit the low bottomed out at 42 degrees at around 3:30 A.M.
but had recovered to 46 degrees by 7 A.M. Calm conditions at
the base of the hill was in stark contrast to the summit where
a 10kt easterly wind was blowing.

Thanks to the inversion, visibility has been on the poorer
side today as the air has remained stagnant in the lower
atmosphere. Visibility has been no higher than 30 miles today,
currently only around 15 miles towards Boston to the north, but
up to 30 miles off to the south. Prevailing visibility is
around 20 miles.

The high so far is 50F, which is 6 degrees above the daily
normal maximum of 46F. The low since midnight is 42F, which is
12 degrees above the normal minimum of 30F.

Today’s Observations:

7 A.M.
Weather: Broken altocumulus, thin broken cirrus
Temperature: 46F; Dew Point: 35F; Wind: E at 8 kts
Sea-level pressure: 30.06 ins. Hg, falling unsteadily
Visibility: 30 miles, patchy ground fog all quadrants
6-hr Max temp: 46F
6-hr Min temp: 42F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 E170 BKN 250 –BKN 30 181/46/35/0908/006/ PTCHY GF ALQDS
THN K LYR ALNG HRZN ALQDS/ 8/071 56006 10046 20042

10 A.M.
Weather: Overcast cirrostratus
Temperature: 47F; Dew Point: 38F; Wind: ESE at 10 kts
Sea-level pressure: 30.02ins. Hg, falling, then more rapidly
Visibility: 20 miles, smoke layer NW-NNE, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 E200 OVC 20 166/47/38/1110/002/ FEW AC NW-NE K LYR NW-NNE
HAZY/ 8/076 58015

1 P.M.
Weather: Overcast stratocumulus
Temperature: 49F; Dew Point: 41F; Wind: Calm
Sea-level pressure: 29.92 ins. Hg, falling unsteadily
Visibility: 20 miles, 30 miles S, 15 miles N
6-hr Max temp: 49F
6-hr Min temp: 41F
3-hr Precip: 0.00 ins.
BHO SA 1755 E24 OVC 20 131/49/41/0000/992/ FEW LWR SC S-SW VSBY 30 S
15 N HAZY WND CALM/ 8/5// 56035 10050 20046

SUMMARY FOR TUESDAY, NOVEMBER 26, 2019

TEMPERATURE (DEGREES F)
MAX…..59   NORMAL…..46
MIN…..39   NORMAL…..30
MEAN….49   NORMAL…..38

DEPARTURE FROM 30-YEAR NORMAL………………. +11
TOTAL DEPARTURE FOR THE MONTH………………..-97 [-3.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………16  DEPARTURE…….-11
TOTAL HEATING UNITS FOR THE MONTH…………..684  DEPARTURE…….+97
TOTAL HEATING UNITS FOR THE SEASON…………1124  DEPARTURE…….-27
TOTAL HEATING UNITS LAST SEASON TO DATE…….1203  DEPARTURE…….-79

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..28 SSW AT  2:06 P.M.
AERO…………………….27 SSW AT 11:59 A.M
ASOS…………………….30 SSW AT  2:07 P.M.
DAVIS……………………27  SW AT 11:57 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….22 SSW AT  1:40 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….22 SSW AT 11:59 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………21  SW AT  2:10 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..12.3 SSW
ASOS…………………..12.4
DAVIS………………….12.0  SW [224 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.43  DEPARTURE……-0.68
ASOS…………..3.59
TOTAL PRECIPITATION FOR THE YEAR……….48.77  DEPARTURE……+0.88
ASOS………….49.06

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.1
TOTAL SNOWFALL FOR THE MONTH…………….0.1  DEPARTURE…….-1.5
TOTAL SNOWFALL FOR THE SEASON……………0.1  DEPARTURE…….-1.8

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/…./0.0/534/86            67 S   AERO M  M   RMY N/A
11/02  50/31/41/-5/0.00/0.0/612/99            17 WNW AERO 14 W   RMY N/A
11/03  53/35/44/-2/0.00/0.0/567/92            25 WSW AERO 23 W   RMY 26
11/04  53/33/43/-2/0.00/0.0/546/89            24 S   AERO 20 S   RMY 24
11/05  54/44/49/+4/0.33/0.0/000/00            22 S   AERO 18 WNW RMY 28
11/06  51/36/44/-1/0.00/0.0/596/98            28 WSW AERO 23 W   RMY 27
11/07  55/38/47/+2/0.27/0.0/000/00            30 S   AERO 26 SSW RMY 32
11/08  38/23/31/-13/0.00/0.0/555/92           38 NW  AERO 37 WNW RMY 44
11/09  39/20/30/-14/0.00/0.0/583/97           22 S   AERO 18 S   RMY N/A
11/10  51/30/41/-3/0.00/0.0/174/29            30 SW  AERO 30 SW  RMY 31
11/11  52/39/46/+3/T/0.0/000/00               23 NE  AERO 22 NE  RMY 23
11/12  42/20/31/-12/0.08/0.1/000/00           37 WNW AERO 37 WNW RMY 41
11/13  28/15/22/-21/0.00/0.0/592/100          32 WNW AERO 32 WNW RMY 35
11/14  36/17/28/-14/0.00/0.0/136/23           18 SW  AERO 17 SW  RMY 20
11/15  51/32/42/0/0.00/0.0/553/94             25 WNW AERO 25 WNW RMY N/A
11/16  35/22/29/-13/0.00/0.0/580/99           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  46/30/38/-2/0.00/0.0/…/..            21 NW  AERO 21 NW  RMY N/A
11/22  52/32/42/+2/0.12/0.0/…/..            46 W   AERO 47 W   RMY 47
11/23  44/27/36/-3/0.00/0.0/…/..            29 WNW AERO 29 WNW RMY N/A
11/24  44/35/40/+1/1.49/0.0/…/..            45 N   AERO 44 NE  RMY 46 TSTM
11/25  50/34/42/+3/0.00/0.0/…/..            32 WNW AERO 35 WNW RMY 23
11/26  59/39/49/+11/0.00/0.0/…/..           28 SSW AERO 27 SSW RMY 29

11/27 The low since midnight is 42F, daily normal minimum is 30F

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 27
HIGH 68 IN 1896
LOW 5 IN 1932
PRECIP 2.23 INS IN 2013
SNOWFALL 16.0 INS IN 1898
PEAK GUST 68 NW IN 1997

RECORDS FOR NOVEMBER 28
HIGH 70 IN 1990
LOW 10 IN 1901,1930,1936
PRECIP 1.84 INCHES IN 1889
SNOWFALL 3.0 INS IN 1917
PEAK GUST 90 SSW IN 1958

TODAY’S REPORT PREPARED BY: Matt Douglas