Saturday, November 11, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, NOVEMBER 11, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

WIND FROM THE NORTHWEST BRING COLDEST TEMPERATURES
OF THE SEASON….

Temperatures began dropping yesterday morning after
winds shifted from the southwest to the west-northwest.
Yesterday’s high temperature for the day was 45F at
4:00 A.M. EST. Temperatures continued to dropped until
this morning around 7:00 A.M. EST. Yesterday’s minimum
temperature tied the daily record of 20F set back in
2004. Temperatures continued to be below seasonable today
with an overnight low of 18F. This is 17 degrees below
the normal minimum temperature of 35F. 18F is also the
coldest temperature this early in the season since 17F
on November 9, 1971. It is also only the fourth
occurrence of a temperature below 20F on November 11th
or earlier on the Blue Hill Observatory record. So far
today we have had a high of 34F which is 18 degrees below
the daily normal of 52F.
Winds from the northwest have decreased since yesterday
afternoon. Yesterday morning we had a peak gust of
46 MPH at 7:26 A.M. EST. So far today we have a peak
gust of 24 kts (28 MPH) and light winds at the 1:00 P.M.
EST observation.

Today’s Observations:

7 A.M.
Weather: Clear, few distant cumulus ENE-ESE
Temperature: 20F; Dew Point: 6F; Wind: NW at 15G22 kts
Sea-level pressure: 30.47 ins. Hg, rising steadily
Visibility: 90 miles
6-hr Max temp: 20F
6-hr Min temp: 18F
24-hr precip: 0.00 inches
BHO SA 1155 CLR 90 318/20/06/3115G22/047/ FEW CU DSNT ENE-ESE/
8/100 53017 10020 20018

10 A.M.
Weather: Clear, few distant cumulus ENE-ESE and few
cirrus SSE-SW and WNW
Temperature: 27F; Dew Point: 9F; Wind: NW at 09G18 kts
Sea-level pressure: 30.52 ins. Hg, rising, then more rapidly
Visibility: 90 miles
BHO SA 1455 CLR 90 336/27/09/3209G18/052/ FEW CU DSNT ENE-ESE
FEW CI SSE-SW AND WNW/ 8/101 51018

1 P.M.
Weather: Clear, few distant cumulus ENE-ESE, few cirrus S-W
Temperature: 33F; Dew Point: 05F; Wind: WNW at 6 kts,
Wind: Light
Sea-level pressure: 30.50 ins. Hg, falling, then more quickly
Visibility: 90 miles
6-hr Max temp: 34F
6-hr Min temp: 19F
BHO SA 1755 CLR 90 327/33/05/3006/050/ FEW CU DSNT ENE-ESE FEW
CI S-W WND LGT/ 8/101 58009 10034 20019

SUMMARY FOR FRIDAY, NOVEMBER 10, 2017

TEMPERATURE (DEGREES F)
MAX…..45   NORMAL…..52
MIN…..20   NORMAL…..35
MEAN….33   NORMAL…..44

DEPARTURE FROM 30-YEAR NORMAL……………………-11
TOTAL DEPARTURE FOR THE MONTH……………………+26 [+2.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..32   DEPARTURE……….11
TOTAL HEATING UNITS FOR THE MONTH………….172   DEPARTURE………-28
TOTAL HEATING UNITS FOR THE SEASON…………440   DEPARTURE……..-323
TOTAL HEATING UNITS LAST SEASON TO DATE…….596   DIFFERENCE…….-156

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….46 WNW AT  7:27 A.M.
AERO……………………44 WNW AT  7:27 A.M.
ASOS……………………45 WNW AT  7:28 A.M.
DAVIS…………………..45 WNW AT  8:17 A.M. RMY 46
FASTEST MILE FOR YESTERDAY…………………33 WNW AT  7:27 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………31 WNW AT 10:22 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..32 WNW AT  7:28 A.M.
AVERAGE WIND SPEED AND DIRECTION………….19.4 WNW
ASOS………………….17.7
DAVIS…………………18.0 WNW [301 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 Low temp since midnight is 18F; 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 11
HIGH 68 IN 1984
LOW 17 IN 1956
PRECIP 1.14 INCHES IN 1991
SNOWFALL 2.5 IN 1986
PEAK GUST 64 NW IN 1962

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

TODAY’S REPORT PREPARED BY: Kaitlin Geagan