Thursday, November 29, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, NOVEMBER 29, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

A BREEZY AND COOL FALL DAY WITH GREAT VISIBILITY
ATOP GREAT BLUE HILL….

Visibility increased from 70 to 85 miles from 7 A.M.
to 10 A.M. Winds have remained northwesterly and
strong for most of the day, averaging over 20 mph at
1 P.M. The highest wind so far today is 41 mph at
12:10 P.M. Skies have become overcast since this
morning. Humidity decreased from 78% to 59% between
7 A.M. and 1 P.M. The high temperature reached so far
today is 43F, 2 degrees below the daily normal of 45F.
The low since midnight is 33F, 4 degrees above the
normal minimum of 29F.

BHO Wettest Novembers, inches (1886-2018):

1) 10.32 in 2018 (through 7 AM on 11/29)
2) 9.78 in 1983
3) 9.29 in 1945
4) 9.17 in 1972
5) 8.95 in 1895
6) 8.93 in 1988
7) 8.79 in 1963

BHO Wettest Falls (Sep-Nov), inches (1886-2018):

1) 25.42 in 2018 (through 7 AM on 11/29)
2) 23.18 in 2005
3) 23.13 in 1996
4) 22.47 in 1888
5) 20.65 in 2011
6) 20.64 in 1932
7) 20.08 in 1962

Today’s Observations:

7 A.M.
Weather: Scattered cirrostratus, few cumulus in all directions
Temperature: 34F; Dew Point: 28F; Wind: NW at 14G21 kts,
Peak wind: 30 mph (26 kts) NW at 6:42 A.M.
Sea-level pressure: 29.68 ins. Hg, rising rapidly
Visibility: 40 miles
6-hr Max temp: 34F
6-hr Min temp: 28F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 250 SCT 40 051/34/28/3214G21/968/ FEW CU ALQDS
PK WND 3226/42/ 8/105 53029 10034 20033

10 A.M.
Weather: Scattered cumulus, broken cirrus
Temperature: 41F; Dew Point: 28F; Wind: NW at 18G25 kts,
Peak wind: 36 mph (31 kts) NW at 9:13 A.M.
Sea-level pressure: 29.72 ins. Hg, rising steadily
Visibility: 85 miles
3-hr Precip: 0.00 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 40 SCT E250 BKN 85 065/41/28/3218G25/972/
PK WND 3231/13/ 8/102 52014

1 P.M.
Weather: Scattered altocumulus, broken cirrus, few
cumulus in all directions
Temperature: 40F; Dew Point: 27F; Wind: NW at 22G32 kts,
Peak wind: 41 mph (36 kts) NW at 12:10 P.M.
Sea-level pressure: 29.72 ins. Hg, steady
Visibility: 85 miles
6-hr Max temp: 43F
6-hr Min temp: 34F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 180 SCT E250 BKN 85 065/40/27/3222G32/972/
FEW CU ALQDS PK WND 3236/10/ 8/162 50000 10043 20034

SUMMARY FOR WEDNESDAY, NOVEMBER 28, 2018

TEMPERATURE (DEGREES F)
MAX…..39   NORMAL…..45
MIN…..31   NORMAL…..30
MEAN….35   NORMAL…..38

DEPARTURE FROM 30-YEAR NORMAL……………………-3
TOTAL DEPARTURE FOR THE MONTH…………………..-75 [-2.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..30   DEPARTURE………+3
TOTAL HEATING UNITS FOR THE MONTH………….716   DEPARTURE……..+74
TOTAL HEATING UNITS FOR THE SEASON………..1260   DEPARTURE……..+55
TOTAL HEATING UNITS LAST SEASON TO DATE…….920   DIFFERENCE……+340

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..37 WNW AT  4:30 P.M.
AERO…………………….41 WNW AT  4:30 P.M.
ASOS…………………….40 NW  AT  4:31 P.M.
DAVIS……………………39 NW  AT  4:31 P.M. RMY 42
FASTEST MILE FOR YESTERDAY………………….25 WNW AT  4:32 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….24 NW  AT  4:32 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………26 NW  AT  4:31 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..15.1 WNW
ASOS…………………..14.3
DAVIS………………….15.4 WNW [295 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.17
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH………10.32  DEPARTURE…….+5.89
ASOS………….10.76
TOTAL PRECIPITATION FOR THE YEAR……….63.37  DEPARTURE……+15.35
ASOS………….65.63

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.2
TOTAL SNOWFALL FOR THE MONTH…………….7.6  DEPARTURE……..+5.6
TOTAL SNOWFALL FOR THE SEASON……………7.6  DEPARTURE……..+5.3

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 38/31/35/-5/…./…/..          30 NE  AERO 30 NE  RMY N/A
11/21 39/20/30/-10/…./…/..         40 WNW AERO 46 WNW RMY 47
11/22 20/09/15/-25/…./…/..         36 NW  AERO 41 NW  RMY 42
11/23 30/09/20/-19/0.00/…/..         25 SW  AERO 25 SW  RMY 27
11/24 43/24/34/-5/…./…/..          27 SW  AERO 27 ESE RMY N/A
11/25 43/40/42/+3/…./…/..          39 ENE AERO 39 ENE RMY 39
11/26 44/39/42/+4/…./…/..          45 E   AERO 44 E   RMY 45
11/27 45/33/39/+1/…./…/..          44 ENE AERO 44 ENE RMY N/A
11/28 39/31/35/-3/…./…/..          37 WNW AERO 41 WNW RMY 42

11/29 Low temp since midnight is 31F; normal low is 29F

DAILY RECORDS FOR NOVEMBER 2017

11/22/18: DAILY RECORD LOW MAXIMUM TEMPERATURE OF 20F,
BREAKS PREVIOUS RECORD OF 26F SET IN 1972 AND 2008
11/22/18: DAILY RECORD LOW MINIMUM TEMPERATURE OF 9F,
BREAKS PREVIOUS RECORD OF 12F SET IN 1987
11/23/18: DAILY RECORD LOW MINIMUM TEMPERATURE OF 9F,
TIES PREVIOUS RECORD OF 9F SET IN 1888

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

RECORDS FOR NOVEMBER 29
HIGH 66 IN 2011
LOW 6 IN 1901
PRECIP 2.69 INCHES IN 1963
SNOWFALL 6.0 INS IN 2012
PEAK GUST 86 SSE IN 1963

RECORDS FOR NOVEMBER 30
HIGH 67 IN 2006
LOW 7 IN 1887, 1929
PRECIP 2.42 INCHES IN 1944
SNOWFALL 10.2 INS IN 1945
PEAK GUST 90 SSW IN 1963

TODAY’S REPORT PREPARED BY: Benjamin Turner