Sunday, November 12, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, NOVEMBER 12, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

TEMPERATURES INCREASE AFTER NEAR RECORD BREAKING COLD…

Temperatures have been increasing since yesterday’s
low minimum temperatures of 18F just before 5:00 A.M.
EST. The record low for November 11th is 17F. Winds
from the northwest kept temperatures well below
seasonable with a maximum high temperature of 36F,
this is 16 degrees below the normal of 52F.
Temperatures although on the rise continue to be
below normal. Temperature dropped overnight down
to 27F and we have had a high of 43F so far today.
This is nine degrees below normal of 52F.
As pressure drops skies have been a mixture of
broken altocumulus and cirrostratus clouds all day.
Visibility increased from 60 miles at the 7:00 A.M.
EST to 70 miles at each other observation. A distant
haze was visible at the 10:00 A.M. observation but it
did not fully obscure visibility. Wind has been light
and variable today.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, broken altocumulus
broken cirrostratus, few cumulus distant ENE-E
Temperature: 30F; Dew Point: 10F; Wind: ESE at 4 kts,
Wind: Light
Sea-level pressure: 30.53 ins. Hg, rising steadily
Visibility: 60 miles
6-hr Max temp: 30F
6-hr Min temp: 27F
24-hr precip: 0.00 inches
BHO SA 1155 200 SCT E230 BKN 300 BKN 60 339/30/10/1104/053/
FEW CU DSNT ENE-E WND LGT/ 8/196 58001 10030 20027

10 A.M.
Weather: Broken altocumulus, broken cirrostratus, few distant
cumulus ENE-SSW
Temperature: 36F; Dew Point: 21F; Wind: NW at ESE 4 kts,
Wind: Light
Sea-level pressure: 30.52 ins. Hg, steady then falling
Visibility: 70 miles, distant haze in all directions
BHO SA 1455 E150 BKN 220 BKN 70 335/36/21/1104/052/ FEW CU DSNT
ENE-SSW DSNT HZ ALQDS WND LGT/ 8/136 58004

1 P.M.
Weather: Scattered stratocumulus, broken altocumulus, broken
cirrostratus
Temperature: 42F; Dew Point: 26F; Wind: SSW at 4 kts,
Wind: Light
Sea-level pressure: 30.46 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 43F
6-hr Min temp: 30F
BHO SA 1755 40 SCT E150 BKN 230 BKN 70 316/42/26/E2104/046/ WND LGT/
8/496 58019 10043 20030

SUMMARY FOR SATURDAY, NOVEMBER 11, 2017

TEMPERATURE (DEGREES F)
MAX…..36   NORMAL…..52
MIN…..18   NORMAL…..35
MEAN….27   NORMAL…..43

DEPARTURE FROM 30-YEAR NORMAL……………………-16
TOTAL DEPARTURE FOR THE MONTH……………………+16 [+0.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..38   DEPARTURE……….16
TOTAL HEATING UNITS FOR THE MONTH………….210   DEPARTURE………-12
TOTAL HEATING UNITS FOR THE SEASON…………478   DEPARTURE……..-307
TOTAL HEATING UNITS LAST SEASON TO DATE…….614   DIFFERENCE…….-136

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….28 WNW AT  6:32 A.M.
AERO……………………26 WNW AT  6:33 A.M.
ASOS……………………28 NW  AT  6:33 A.M.
DAVIS…………………..27 NW  AT  6:33 A.M. RMY 28
FASTEST MILE FOR YESTERDAY…………………19 WNW AT  6:33 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………20 NW  AT  7:09 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..20 NW  AT  6:33 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.5 NW
ASOS…………………..9.2
DAVIS………………….9.1 NNW [331 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.26  DEPARTURE……-1.30
ASOS…………..0.24
TOTAL PRECIPITATION FOR THE YEAR……….48.06  DEPARTURE……+2.73
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/…/..              25 SE  AERO 24 SE  RMY 25
11/2  71/49/60/+14/0.00/…/..            28 SSE AERO 25 SSE RMY 27
11/3  74/47/61/+15/T/…/..               35 WNW AERO 35 WNW RMY 38
11/4  54/39/47/+2/0.00/…/..             31 NW  AERO 31 NW  RMY N/A
11/5  61/46/54/+9/0.01/…/..             26 S   AERO 24 S   RMY N/A
11/6  64/47/56/+11/0.05/…/..            32 S   AERO 28 SSW RMY 35
11/7  46/35/41/-4/0.11/…/..             26 NNW AERO 23 N   RMY 26
11/8  43/34/39/-5/0.08/…/..             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 Low temp since midnight is 27F; normal low is now 35F

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 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: Kaitlin Geagan