Monday, November 12, 2018

| November 12, 2018 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, NOVEMBER 12, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

DRY AND COOL WITH INCREASING WIND AND FALLING PRESSURE
IN THE AFTERNOON….

We observed 70 miles of visibility throughout the day, with
a pressure decrease becoming more notable after noontime. Wind
was light and variable this morning, becoming more significant
a little before the 1 P.M. observation. Humidity decreased
to a minimum of 40% from 74% at 7 A.M. The high so far today
is 48F, 3 degrees below the daily normal of 51F. The low since
midnight is 27F, 8 degrees below the normal minimum of 35F.

 

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: Clear, few distant altocumulus in all directions
Temperature: 31F; Dew Point: 23F; Wind: WNW at 4 kts
Wind: Light and variable
Sea-level pressure: 30.43 ins. Hg, rising steadily
Visibility: 70 miles
6-hr Max temp: 31F
6-hr Min temp: 27F
24-hr Precip: 0.00 ins.
BHO SA 1155 220 SCT 70 304/31/23/2904/043/ FEW DSNT AC
ALQDS WND L/V/ 8/081 53012 10031 20027

10 A.M.
Weather: Scattered cirrus
Temperature: 39F; Dew Point: 20F; Wind: SSW at 3 kts,
Wind: Light and variable
Sea-level pressure: 30.41 ins. Hg, falling then rising
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 70 298/39/20/2003/041/ WND L/V/ 8/002
50006

1 P.M.
Weather: Scattered cirrus
Temperature: 48F; Dew Point: 25F; Wind: W at 7G15 kts
Sea-level pressure: 30.35 ins. Hg, falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 48F
6-hr Min temp: 30F
6-hr Precip: 0.00 ins.
BHO SA 1755 250 SCT 70 279/48/25/2607G15/035/ 8/002 58019
10048 20030

SUMMARY FOR SUNDAY, NOVEMBER 11, 2018

TEMPERATURE (DEGREES F)
MAX…..43   NORMAL…..52
MIN…..30   NORMAL…..35
MEAN….37   NORMAL…..43

DEPARTURE FROM 30-YEAR NORMAL…………………..-6
TOTAL DEPARTURE FOR THE MONTH………………….+35 [+3.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..28   DEPARTURE………+6
TOTAL HEATING UNITS FOR THE MONTH………….187   DEPARTURE……..-35
TOTAL HEATING UNITS FOR THE SEASON…………731   DEPARTURE……..-55
TOTAL HEATING UNITS LAST SEASON TO DATE…….478   DIFFERENCE……+253

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..32 WNW AT 10:07 A.M.
AERO…………………….30 W   AT 10:02 A.M.
ASOS…………………….33 W   AT 2:33 A.M.
DAVIS……………………35 WNW AT 2:32 A.M. RMY 32
FASTEST MILE FOR YESTERDAY………………….30 W   AT 2:33 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….24 W   AT 2:33 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………26 W   AT 2:33 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..14.7 W
ASOS…………………..13.9
DAVIS………………….15.1 WNW [290 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.16
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….4.91  DEPARTURE…….+3.20
ASOS…………..5.09
TOTAL PRECIPITATION FOR THE YEAR……….57.95  DEPARTURE……+12.65
ASOS………….59.95

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 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 Low temp since midnight is 27F; normal low is 35F

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

RECORDS FOR NOVEMBER 12
HIGH 74 IN 1909
LOW 18 IN 1926
PRECIP 3.25 INCHES IN 1947
SNOWFALL 8.1 INCHES IN 1987
PEAK GUST 79e MPH NW IN 1947

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

TODAY’S REPORT PREPARED BY: Samantha Richard / Benjamin Turner

 

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