Tuesday, November 13, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, NOVEMBER 13, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

RAIN AND FOG WITH PLUMMETING PRESSURE ATOP
GREAT BLUE HILL….

Rainfall this morning left 0.45 inches in the gauge
at the 7 A.M. observation. The rain continued through
1 P.M, where we measured another 0.60 inches. Fog
reduced visibility to 1/16 miles for the majority of
the day. However, it broke up momentarily around 10 A.M.,
where a visibility of 5 miles was observed. A wind shift
from ESE-NNW was observed between noon and 1 P.M. Pressure
has dropped by a notable 13 millibars since 7 A.M. The high so
far today is 52F, a degree above the daily normal of 51F.
The low since midnight is 39F, 5 degrees above the normal
minimum of 34F.

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: Moderate rain and fog
Temperature: 46F; Dew Point: 46F; Wind: SE at 13G18 kts
Sea-level pressure: 30.08 ins. Hg, falling rapidly
Visibility: 1/16 mile, fog
6-hr Max temp: 46F
6-hr Min temp: 40F
24-hr Precip: 0.45 ins.
BHO SA 1155 W3 X 1/16RF 187/46/46/1413G18/008/ R CTD/ 8////
70045 58040 10046 20040

10 A.M.
Weather: Moderate rain and fog
Temperature: 50F; Dew Point: 50F; Wind: SE at 14G22 kts
Sea-level pressure: 29.94 ins. Hg, falling rapidly
Visibility: 5 miles, fog
3-hr Precip: 0.26 ins.
BHO SA 1455 –X E5 OVC 5RF 139/50/50/1214G22/994/ R CTD/
8/72/ 6026/ 58048

1 P.M.
Weather: Light rain and fog
Temperature: 51F; Dew Point: 51F; Wind: NW at 7 kts
Sea-level pressure: 29.97 ins. Hg, falling rapidly
Visibility: 1/16 mile, fog
6-hr Max temp: 52F
6-hr Min temp: 46F
6-hr Precip: 0.60 ins.
BHO SA 1755 W3 X 1/16R-F 058/51/51/3207/970/ R-CTD/ 8//// 6060/
56081 10052 20046

SUMMARY FOR MONDAY, NOVEMBER 12, 2018

TEMPERATURE (DEGREES F)
MAX…..48   NORMAL…..51
MIN…..27   NORMAL…..35
MEAN….38   NORMAL…..43

DEPARTURE FROM 30-YEAR NORMAL…………………..-5
TOTAL DEPARTURE FOR THE MONTH………………….+30 [+2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..27   DEPARTURE………+5
TOTAL HEATING UNITS FOR THE MONTH………….214   DEPARTURE……..-35
TOTAL HEATING UNITS FOR THE SEASON…………758   DEPARTURE……..-49
TOTAL HEATING UNITS LAST SEASON TO DATE…….507   DIFFERENCE……+251

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..18 S   AT  1:17 P.M.
AERO…………………….18 SW  AT 10:02 P.M.
ASOS…………………….20 SW  AT  1:19 P.M.
DAVIS……………………20 SSE AT 10:15 P.M. RMY 28
FASTEST MILE FOR YESTERDAY………………….15 SSE AT  8:10 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….15 S   AT  8:15 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………15 WSW AT 11:47 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.0 S
ASOS…………………..8.8
DAVIS………………….9.1 SW [226 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.45  DEPARTURE…….+0.29
ASOS…………..0.46
TOTAL PRECIPITATION FOR THE MONTH……….5.36  DEPARTURE…….+3.49
ASOS…………..5.55
TOTAL PRECIPITATION FOR THE YEAR……….58.40  DEPARTURE……+12.94
ASOS………….60.41

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/…./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/…./148/24          59 W   AERO 60 W   RMY 58
11/04 52/37/45/0/…./588/96           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/…./…/..          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 45/32/39/-5/…./…/..          45 W   AERO 47 WNW RMY 46
11/11 43/30/37/-6/0.00/…/..          32 WNW AERO 30 W   RMY 32
11/12 48/27/38/-5/0.00/…/..          18 SW  AERO 18 SW  RMY N/A

11/13 Low temp since midnight is 39F; normal low is 34F

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

RECORDS FOR NOVEMBER 13
HIGH 66 IN 1931, 1964
LOW 14 IN 1920
PRECIP 1.96 INCHES IN 1982
SNOWFALL 4.6 IN 2004
PEAK GUST 77 S IN 1982

RECORDS FOR NOVEMBER 14
HIGH 70 IN 1993
LOW 11 IN 1905
PRECIP 2.08 INCHES IN 2009
SNOWFALL 3.5 IN 1997, 2014
PEAK GUST 63 W IN 2003

TODAY’S REPORT PREPARED BY: Benjamin Turner