Saturday, November 10, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, NOVEMBER 10, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

SEVERAL HOURS OF HEAVY RAIN OVERNIGHT…PRECIPITATION LINGERS
AS LIGHT DRIZZLE THIS MORNING…STORM TOTAL 1.78 INCHES…

Rain that began last evening just before 7 PM EST became heavy
a few hours later with over an inch of rain falling in the
three hours from 9 PM to midnight last night. A total of 1.73
inches was measured in the standard gauge this morning, with the
heavy rain becoming moderate after midnight and then becoming
light rain after 2 AM. Light drizzle lingered into mid-morning
and the precipitation ended shortly after a brief rain shower
passed around 10 AM. An additional 0.05 inches was measured for
the six hours ending at 1 PM EST, making the storm total rainfall
1.78 inches. This brings the monthly total up to 4.86 inches
just through the first ten days of the month, continuing a very
wet Fall season.  The Observatory has recorded nearly 20 inches
of rain since September 1st. The temperature remained steady
in the middle 40’s much of the night into mid-morning, and the
wind peaked at 43 mph from the E just before midnight. After a
period of lighter winds this morning, the wind picked up again
as the storm began to depart just after 10 AM. The peak gust since
then has been 40 mph W ar 2:10 PM. The visibility climbed quickly
from 1/16 mile early this morning to 75 miles by late morning
after the rain ended and drier air and much lower dew points
began moving into the area. The dew point has dropped from 45F
early today to the low 20’s this afternoon.

PRELIMINARY STATS FOR OCTOBER 2018

TEMPERATURE, Deg. F
Avg. Max. 58.0 [-2.3] Avg. Min. 42.7 [-0.2] Mean 50.4 [-1.2] 24-hour corrected mean: 50.2
Max. for month: 82F on the 10th
Min. for month: 27F on the 22nd and 26th

HEATING DEGREE DAYS
Total heating units: 457 [+36] Total for the season: 544 [-19] Total for last season: 268

PRECIPITATION, Inches
Total: 5.85 in. [+1.16] Greatest in 24 hrs: 2.08 inches on October 27

WIND, mph
Avg. uncorrected wind speed: 11.6 mph
Avg. corrected wind speed: 12.0
Prevailing wind direction: W [14% of total hours] Peak gust and direction: 54 NE

SUNSHINE:
Campbell-Stokes card minutes: 7800 minutes of possible 19824 or 39%
Astronomical total minutes: 8090 minutes of possible 20544 or 39%

Today’s Observations:

7 A.M.
Weather: Sky obscured in light drizzle and dense fog
Temperature: 44F; Dew Point: 44F; Wind: WNW at 7 kts
Sea-level pressure: 29.70 ins. Hg, rising then more slowly
Visibility: 1/16 mile
6-hr Max temp: 45F
6-hr Min temp: 44F
24-hr Precip: 1.73 ins.
BHO SA 1155 W2 X 1/16L-F 059/44/44/3007/970/ L-CTD /
8//// 51009 60/// 70173 10045 20044

10 A.M.
Weather: Sky partly obscured, light rain shower, light
drizzle and fog, overcast nimbostratus
Temperature: 45F; Dew Point: 45F; Wind: W at 10 kts
Sea-level pressure: 29.71 ins. Hg, rising slightly
Visibility: 3/4 miles, variable 1/2 to 1 mile
3-hr Precip: 0.04 ins.
BHO SA 1455 –X E4 OVC 3/4VRW-L-F 061/45/45/2710/971/ F4
VSBY 1/2V1 VSBY INCR RW-B50L-CTD/ 8/72/ 51002 6004/

1 P.M.
Weather: Scattered stratocumulus, broken stratocumulus
Temperature: 42F; Dew Point: 29F; Wind: W at 18G27 kts
Sea-level pressure: 29.76 ins. Hg, rising then more quickly
Visibility: 75 miles
6-hr Max temp: 45F
6-hr Min temp: 40F
6-hr Precip: 0.05 ins.
BHO SA 1755 30 SCT E55 BKN 75 078/42/29/2818G27/976/
PK WND 2832/19/ 8/500 53017 6005/ 10045 20040

SUMMARY FOR FRIDAY, NOVEMBER 9, 2018

TEMPERATURE (DEGREES F)
MAX…..48   NORMAL…..52
MIN…..34   NORMAL…..35
MEAN….41   NORMAL…..44

DEPARTURE FROM 30-YEAR NORMAL…………………..-3
TOTAL DEPARTURE FOR THE MONTH………………….+46 [+4.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..24   DEPARTURE………+3
TOTAL HEATING UNITS FOR THE MONTH………….133   DEPARTURE……..-46
TOTAL HEATING UNITS FOR THE SEASON…………677   DEPARTURE……..-65
TOTAL HEATING UNITS LAST SEASON TO DATE…….408   DIFFERENCE……+269

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..43 E   AT 11:54 P.M.
AERO…………………….40 E   AT 11:54 P.M.
ASOS…………………….43 E   AT 11:54 P.M.
DAVIS……………………43 E   AT 11:54 P.M. RMY 42
FASTEST MILE FOR YESTERDAY………………….30 E   AT 11:54 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….30 E   AT 11:57 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………32 E   AT  9:57 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..13.2 E
ASOS…………………..13.8
DAVIS………………….13.3 E  [078 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….1.73  DEPARTURE…….+1.57
ASOS…………..1.81
TOTAL PRECIPITATION FOR THE MONTH……….4.86  DEPARTURE…….+3.47
ASOS…………..5.04
TOTAL PRECIPITATION FOR THE YEAR……….57.90  DEPARTURE……+12.92
ASOS………….59.90

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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

10/01 65/53/59/+2/0.22/042/06         21 ENE AERO 18 SSW RMY N/A
10/02 64/53/59/+2/0.77/000/00         33 S   AERO 32 S   RMY 35 TSTM
10/03 60/52/56/0/0.33/000/00          18 NNE AERO 14 NNE RMY 14
10/04 69/57/63/+7/0.00/209/30         29 SSW AERO 29 SSW RMY 32
10/05 64/47/56/0/0.00/638/92          25 NE  AERO 21 NE  RMY 24
10/06 64/45/55/0/0.00/276/40          23 SSW AERO 23 SSW RMY 25
10/07 75/56/66/+11/0.05/076/11        28 NE  AERO 24 ENE RMY 27
10/08 56/53/55/+1/0.03/000/00         22 ENE AERO 20 ENE RMY N/A
10/09 75/56/66/+12/0.00/211/31        26 WSW AERO 28 SW  RMY 29
10/10 82/65/74/+20/0.00/496/73        24 WSW AERO 23 WSW RMY 25
10/11 70/56/63/+10/0.78/000/00        48 NNE AERO 47 NNE RMY 50
10/12 59/44/52/-1/0.31/182/27         32 NW  AERO 32 NW  RMY 33
10/13 49/40/45/-8/0.17/114/17         21 WNW AERO 20 WNW RMY 20
10/14 55/37/46/-6/0.00/127/19         21 W   AERO 18 W   RMY 21
10/15 66/44/55/+3/0.06/033/05         46 W   AERO 46 W   RMY N/A
10/16 56/41/49/-2/0.03/622/94         48 W   AERO 48 W   RMY N/A
10/17 60/39/50/-1/0.01/587/89         48 W   AERO 50 W   RMY 53
10/18 45/33/39/-12/0.00/657/100       32 WNW AERO 35 WNW RMY 36
10/19 60/31/46/-4/0.00/602/92         33 SSW AERO 36 SSW RMY 36
10/20 62/46/54/+4/0.00/228/35         35 SSW AERO 37 SSW RMY 33
10/21 46/31/39/-11/0.02/363/56        39 NNW AERO 41 NW  RMY 41
10/22 50/27/39/-10/0.00/497/77        24 W   AERO 22 W   RMY 21
10/23 53/40/47/-2/0.51/103/16         29 WNW AERO 29 WNW RMY 29  TSTM
10/24 45/35/40/-9/0.03/096/15         31 NW  AERO 31 NW  RMY 32
10/25 48/32/40/-9/0.00/510/80         35 NW  AERO 35 NW  RMY 36
10/26 45/27/36/-12/0.00/610/96        20 NW  AERO 19 NW  RMY N/A
10/27 48/38/43/-5/2.08/000/00         54 NE  AERO 55 NE  RMY 55
10/28 51/40/46/-2/0.07/000/00         23 NNE AERO 23 NNE RMY N/A TSTM
10/29 55/40/48/+1/0.37/138/22         30 WSW AERO 30 WSW RMY 34
10/30 45/34/40/-7/0.00/306/49         28 NW  AERO 28 NW  RMY 30
10/31 55/32/44/-3/0.01/367/59         35 SSW AERO 36 SSW RMY 37

DAILY RECORDS FOR OCTOBER

10/10/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 65F,
BREAKS PREVIOUS RECORD OF 62F SET IN 1949

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/…./…/..         25 SSW AERO 24 SSW RMY N/A
11/02 65/52/59/+13/…./…/..         37 SSW AERO 41 SSW RMY N/A
11/03 64/42/53/+7/…./…/..          59 W   AERO 60 W   RMY 58
11/04 52/37/45/0/…./…/..           31 W   AERO 30 W   RMY N/A
11/05 49/40/45/0/…./…/..           30 ENE AERO 29 ENE RMY 28
11/06 58/45/52/+7/…./…/..          29 SSW AERO 29 SSW RMY 31
11/07 60/50/55/+10/…./…/..         30 WSW AERO 30 WSW RMY 32
11/08 52/37/45/+1/…./…/..          29 WNW AERO 26 WNW RMY 23
11/09 48/34/41/-3/…./…/..          43 E   AERO 40 E   RMY 42

11/10 Low temp since midnight is 44F; normal low is 35F

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

RECORDS FOR NOVEMBER 10
HIGH 75 IN 1931
LOW 20 IN 2004
PRECIP 2.11 INCHES IN 1888
SNOWFALL 2.2 IN 1987
PEAK GUST 83e S IN 1942

RECORDS FOR NOVEMBER 11
HIGH 68 IN 1984
LOW 17 IN 1956
PRECIP 1.14 INCHES IN 1991
SNOWFALL 2.5 IN 1986
PEAK GUST 64 NW IN 1962

TODAY’S REPORT PREPARED BY: Mike Iacono