Friday, November 17, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, NOVEMBER 17, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

GUSTY DAY WITH CLOUDS CLEARING AS PRESSURE RISES…

Winds have been moderate to strong and from the
northwest today with a peak gust of 36 kts (41 MPH)
by 1:00 P.M. EST. With wind coming from the southeast
yesterday we were shortly back to more seasonable
temperatures with a high of 51F. This is only one
degree above the normal of 50F. Winds shifted
overnight from the southeast to the northwest.
The northwestern air has caused temperatures to be
9 degrees below seasonable today with a high of 41F
by 1:00 P.M. EST. The morning started partly cloudy
but skies cleared by the afternoon with a few cumulus
and overhead cirrus clouds. We also saw a drop in
humidity today which allowed for 80 miles of visibility
at the 1:00 P.M. EST observation.

Today’s Observations:

7 A.M.
Weather: Scattered stratocumulus, scattered altocumulus
Temperature: 36F; Dew Point: 28F; Wind: WNW at 16G26 kts,
Peak Wind: 30 kts (35 MPH) WNW at 6:35 A.M. EST
Sea-level pressure: 29.82 ins. Hg, rising steadily
Visibility: 40 miles
6-hr Max temp: 38F
6-hr Min temp: 35F
24-hr precip: 0.21 ins.
BHO SA 1155 30 SCT 130 SCT 40 099/36/28/3016G26/982/ PK WND
3030/35/ 8/880 51025 MANUAL 70021 ASOS 70021 10038 20035

10 A.M.
Weather: Scattered cumulus, scattered altocumulus
Temperature: 38F; Dew Point: 29F; Wind: NW at 17G28 kts,
Peak Wind: 28 kts (32 MPH) WNW at 9:07 A.M. EST
Sea-level pressure: 29.89 ins. Hg, rising, then more slowly
Visibility: 70 miles
BHO SA 1455 30 SCT 100 SCT 70 121/38/29/3117G28/989/ PK WND 3136/07/
8/180 51022

1 P.M.
Weather: Clear, few cumulus in all directions, few cirrus
overhead
Temperature: 41F; Dew Point: 24F; Wind: WNW at 13G26 kts,
Peak Wind: 26 kts (30 MPH) WNW at 12:52 A.M. EST
Sea-level pressure: 29.88 ins. Hg, rising then falling
Visibility: 80 miles
6-hr Max temp: 41F
6-hr Min temp: 35F
BHO SA 1755 CLR 80 118/41/24/3013G26/988/ FEW CU ALQDS FEW CI OVHD
PK WND 3026/52/ 8/101 57003 10041 20035

SUMMARY FOR THURSDAY, NOVEMBER 16, 2017

TEMPERATURE (DEGREES F)
MAX…..51   NORMAL…..50
MIN…..37   NORMAL…..34
MEAN….44   NORMAL…..42

DEPARTURE FROM 30-YEAR NORMAL…………………….+2
TOTAL DEPARTURE FOR THE MONTH…………………….-4 [-0.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..21   DEPARTURE……….-2
TOTAL HEATING UNITS FOR THE MONTH………….343   DEPARTURE………..8
TOTAL HEATING UNITS FOR THE SEASON…………611   DEPARTURE……..-287
TOTAL HEATING UNITS LAST SEASON TO DATE…….694   DIFFERENCE……..-83

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….32 SE  AT 11:26 A.M.
AERO……………………32 SE  AT 11:26 A.M.
ASOS……………………32 SSE AT 11:14 A.M.
DAVIS…………………..32 SE  AT 11:27 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………23 SE  AT 11:26 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………22 W   AT  6:07 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..23 WNW AT  6:07 P.M.
AVERAGE WIND SPEED AND DIRECTION………….13.8 SE
ASOS………………….13.5
DAVIS…………………13.0 S [172 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.21  DEPARTURE……+0.06
ASOS…………..0.21
TOTAL PRECIPITATION FOR THE MONTH……….0.73  DEPARTURE……-1.78
ASOS…………..0.70
TOTAL PRECIPITATION FOR THE YEAR……….48.53  DEPARTURE……+2.25
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/…/..          25 S   AERO 23 S   RMY N/A
11/10 45/20/33/-11/0.00/…/..         46 WNW AER0 44 WNW RMY 46
11/11 36/18/27/-16/0.00/…/..         28 WNW AERO 26 WNW RMY 28
11/12 44/27/36/-7/0.00/…/..          13 E   AERO  9 S   RMY 14
11/13 40/35/38/-5/…/…/..           20 NNW AERO 17 NNW RMY 20
11/14 40/33/37/-5/…/…/..           18 N   AERO 15 N   RMY 18
11/15 43/31/37/-5/0.00/…/..          20 NE  AERO 15 NE  RMY N/A
11/16 51/37/44/+2/…/…/..           32 SE  AERO 32 SE  RMY N/A TSTM

11/17 Low temp since midnight is 35F; normal low is now 33F

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 17
HIGH 74 IN 1928
LOW 10 IN 1924
PRECIP 1.92 INCHES IN 1920
SNOWFALL 1.0 INS IN 1980
PEAK GUST 61 SSE IN 2006

RECORDS FOR NOVEMBER 18
HIGH 72 IN 1963
LOW 10 IN 1936
PRECIP 1.80 INS IN 1929
SNOWFALL 6.3 INS IN 1980
PEAK GUST 60 SW IN 1987

TODAY’S REPORT PREPARED BY: Kaitlin Geagan