Thursday, November 23, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, NOVEMBER 23, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

HIGH PRESSURE AND A NORTHWEST WIND BRING CLEAR
SKIES, DRY AIR AND COOLER TEMPERATURES TO GREAT
BLUE HILL THIS THANKSGIVING DAY…

The wind shifted once again yesterday afternoon from
the SSW-NW just after 2:00 P.M. EST. This caused
temperatures to fall quickly with a 27 degree departure
from yesterday’s maximum of 53F to this morning’s
minimum of 26F. The wind picked up overnight after
the shift but has become lighter so far today.
The sky has been clear all day with only a few
cumulus and cirrus clouds. Humidity has significantly
dropped since yesterday’s 100% down to 64% by 10:00
A.M. EST and is still continuing to drop. This made
for near perfect visibility at 80 miles during each
observation.

Today’s Observations:

7 A.M.
Weather: Clear, few distant cumulus ENE-E, few cirrus E-N
Temperature: 28F; Dew Point: 22F; Wind: NW at 10 kts
Sea-level pressure: 30.03 ins. Hg, rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 33F
6-hr Min temp: 26F
24-hr precip: 0.85 ins.
BHO SA 1155 CLR 80 168/28/22/3110/003/ FEW CU DSNT ENE-E FEW CI E-N/
8/101 51017 MANUAL 70085 ASOS 70087 10033 20026

10 A.M.
Weather: Clear, few cirrus in all directions
Temperature: 34F; Dew Point: 23F; Wind: WNW at 8 kts
Sea-level pressure: 30.02 ins. Hg, rising then falling
Visibility: 80 miles
3-hr precip: 0.00 ins.
BHO SA 1455 CLR 80 166/34/23/3008/002/ FEW CI ALQDS/ 8/001 58002

SUMMARY FOR WEDNESDAY, NOVEMBER 22, 2017

TEMPERATURE (DEGREES F)
MAX…..53   NORMAL…..48
MIN…..35   NORMAL…..32
MEAN….44   NORMAL…..40

DEPARTURE FROM 30-YEAR NORMAL……………………..+4
TOTAL DEPARTURE FOR THE MONTH……………………..-6 [-0.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………21   DEPARTURE……….-4
TOTAL HEATING UNITS FOR THE MONTH………..488   DEPARTURE……….+6
TOTAL HEATING UNITS FOR THE SEASON……….756   DEPARTURE……..-289
TOTAL HEATING UNITS LAST SEASON TO DATE…..835   DIFFERENCE……..-79

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….37 NW AT 10:46 P.M.
AERO……………………38 NW AT 10:46 P.M.
ASOS……………………40 NW AT 10:46 P.M.
DAVIS…………………..39 NW AT 10:46 P.M. RMY 41
FASTEST MILE FOR YESTERDAY…………………28 NW AT 10:46 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………26 NW AT 10:46 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..27 NW AT 10:47 P.M.
AVERAGE WIND SPEED AND DIRECTION………….13.1 NW
ASOS………………….13.7
DAVIS…………………12.3 WNW [285 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.85  DEPARTURE……+0.69
ASOS…………..0.87
TOTAL PRECIPITATION FOR THE MONTH……….2.04  DEPARTURE……-1.43
ASOS…………..2.00
TOTAL PRECIPITATION FOR THE YEAR……….49.84  DEPARTURE……+2.60
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 53/35/44/+4/…/…/..           37 NW  AERO 38 NW  RMY 41

11/23 Low temp since midnight is 26F; normal low is now 31F

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 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

RECORDS FOR NOVEMBER 24
HIGH 69 IN 1931
LOW 7 IN 1897
PRECIP 1.76 INCHES IN 1901
SNOWFALL 4.5 INS IN 1936
PEAK GUST 69 SSW IN 1959

TODAY’S REPORT PREPARED BY: Kaitlin Geagan