Wednesday, November 22, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, NOVEMBER 22, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

LOW PRESSURE BRINGS LIGHT RAIN AND FOG TO THE
TOP OF GREAT BLUE HILL..

Pressure began dropping overnight and rain began
just before 7:00 A.M. EST. Rain has been light to
moderate and constant all day. We have also been
socked in the fog today with a maximum visibility
this morning at 1/2 mile. We measured 0.02 inches
of precipitation by 7:00 A.M. and an additional
0.54 inches by 1:00 P.M. Winds from the S and SE
have been lighter compared to earlier in the week.
The southern wind has given us another day of above
seasonable temperatures with a high of 52F by
1:00 P.M. EST. This is 4 degrees above the normal of
48F. Yesterday was warmer with a high of 57F which
is 9 degrees above the normal. It has also been a
very humid at 100% for most of the day this caused
temperatures to stay fairly consistent all day with
a high of 52F and a low of 51F between 7:00 A.M. and
1:00 P.M. EST.

Today’s Observations:

7 A.M.
Weather: Light rain and fog
Temperature: 51F; Dew Point: 50F; Wind: SSE at 9 kts
Sea-level pressure: 29.95 ins. Hg, falling, then more quickly
Visibility: 1/2 mile
6-hr Max temp: 51F
6-hr Min temp: 49F
24-hr precip: 0.02 ins.
BHO SA 1155 W3 X 1/2R-F 142/51/50/1609/995/ 8//// 58015
MANUAL 70002 ASOS 70002 10051 20049

10 A.M.
Weather: Light rain and fog
Temperature: 52F; Dew Point: 52F; Wind: SSW at 4 kts,
Wind: Light
Sea-level pressure: 29.93 ins. Hg, falling, then more quickly
Visibility: 1/4 mile
3-hr precip: 0.25 ins.
BHO SA 1455 W3 X 1/4R-F 134/52/52/E2004/993/ WND LGT/ 8////
58008 MANUAL 6025/ ASOS 60025

1 P.M.
Weather: Light rain and fog
Temperature: 51F; Dew Point: 51F; Wind: SE at 7 kts
Sea-level pressure: 29.80 ins. Hg, falling, unsteadily
Visibility: 1/4 mile
6-hr Max temp: 52F
6-hr Min temp: 51F
6-hr precip: 0.54 ins.
BHO SA 1755 W3 X 1/4R-F 092/51/51/1307/980/ 8//// 58042
MANUAL 6054/ ASOS 60055 10052 20051

SUMMARY FOR TUESDAY, NOVEMBER 21, 2017

TEMPERATURE (DEGREES F)
MAX…..57   NORMAL…..48
MIN…..35   NORMAL…..32
MEAN….46   NORMAL…..40

DEPARTURE FROM 30-YEAR NORMAL……………………..+6
TOTAL DEPARTURE FOR THE MONTH…………………….-10 [-0.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………19   DEPARTURE……….-6
TOTAL HEATING UNITS FOR THE MONTH………..467   DEPARTURE………+10
TOTAL HEATING UNITS FOR THE SEASON……….735   DEPARTURE……..-285
TOTAL HEATING UNITS LAST SEASON TO DATE…..805   DIFFERENCE……..-70

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….46 SSW AT  2:00 P.M.
AERO……………………46 SSW AT  2:00 P.M.
ASOS……………………47 SSW AT  2:00 P.M.
DAVIS…………………..49 SW  AT  2:00 P.M. RMY 48
FASTEST MILE FOR YESTERDAY…………………35 SSW AT  2:00 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………33 SSW AT  1:27 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..35 SSW AT  1:27 P.M.
AVERAGE WIND SPEED AND DIRECTION………….19.9 SSW
ASOS………………….19.2
DAVIS…………………19.0 SSW [213 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.02  DEPARTURE……-0.14
ASOS…………..0.02
TOTAL PRECIPITATION FOR THE MONTH……….1.19  DEPARTURE……-2.12
ASOS…………..1.13
TOTAL PRECIPITATION FOR THE YEAR……….48.99  DEPARTURE……+1.91
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

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

11/1  53/39/46/0/0.00/167/27           25 SE  AERO 24 SE  RMY 25
11/2  71/49/60/+14/0.00/000/00         28 SSE AERO 25 SSE RMY 27
11/3  74/47/61/+15/T/350/57            35 WNW AERO 35 WNW RMY 38
11/4  54/39/47/+2/0.00/545/89          31 NW  AERO 31 NW  RMY N/A
11/5  61/46/54/+9/0.01/006/01          26 S   AERO 24 S   RMY N/A
11/6  64/47/56/+11/0.05/000/00         32 S   AERO 28 SSW RMY 35
11/7  46/35/41/-4/0.11/145/24          26 NNW AERO 23 N   RMY 26
11/8  43/34/39/-5/0.08/295/49          26 N   AERO 23 N   RMY 27
11/9  50/31/41/-3/0.01/480/80          25 S   AERO 23 S   RMY N/A
11/10 45/20/33/-11/0.00/586/98         46 WNW AER0 44 WNW RMY 46
11/11 36/18/27/-16/0.00/589/99         28 WNW AERO 26 WNW RMY 28
11/12 44/27/36/-7/0.00/302/51          13 E   AERO  9 S   RMY 14
11/13 40/35/38/-5/…./000/00          20 NNW AERO 17 NNW RMY 20
11/14 40/33/37/-5/…./000/00          18 N   AERO 15 N   RMY 18
11/15 43/31/37/-5/0.00/417/71          20 NE  AERO 15 NE  RMY N/A
11/16 51/37/44/+2/…./012/02          32 SE  AERO 32 SE  RMY N/A TSTM
11/17 42/30/36/-5/0.00/…/..          41 WNW AERO 43 WNW RMY 47
11/18 49/26/38/-3/…./…/..          35 SSW AERO 35 SSW RMY 39
11/19 58/34/46/+5/…./…/..          50 W   AERO 50 W   RMY 54
11/20 39/31/35/-5/0.00/…/..          48 WNW AERO 50 WNW RMY 44
11/21 57/35/46/+6/…/…/..           46 SSW AERO 46 SSW RMY 48

11/22 Low temp since midnight is 49F; normal low is now 32F

DAILY RECORDS FOR NOVEMBER 2017

11/10/17: DAILY RECORD LOW MINIMUM TEMPERATURE OF 20F,
TIES WITH PREVIOUS RECORD SET IN 2004

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

RECORDS FOR NOVEMBER 22
HIGH 70 IN 1931
LOW 12 IN 1987
PRECIP 1.78 INS IN 2005
SNOWFALL 9.0 INS IN 1971
PEAK GUST 70e SE IN 1945

RECORDS FOR NOVEMBER 23
HIGH 73 IN 1931
LOW 9 IN 1888
PRECIP 2.33 INS IN 2006
SNOWFALL 5.5 INS IN 1989
PEAK GUST 64e S IN 1953

TODAY’S REPORT PREPARED BY: Kaitlin Geagan