Friday, September 17, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, SEPTEMBER 17, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0527E
SUNSET: 1750E
GLOOMY WEATHER CONTINUES…
Not a whole lot of change has occurred here since yesterday. If any
difference, temperatures a slightly cooler- hanging out in the
low 60s compared to the upper 60s experienced yesterday. The
summit is socked in fog with a peak visibility of only 5
miles. No bright sunshine recorded on the sun card thus far today.
The clouds have not precipitated anything measurable. We
recorded 0.03 inches for the 24-hour total ending today
at 0700E, and only a Trace through 1PM. Winds are unremarkable
and remain out of the NE/ENE.
The high so far today is 66F, this is 6 degrees below the
daily normal maximum of 72F. The low so far today is 60F,
which is 5 degrees above the daily normal minimum of 55F.
Today’s Observations:
7 A.M.
Weather: Sky Obscured, Vertical Visibility 200 feet, Fog
Temperature: 62F; Dew Point: 62F; Relative Humidity: 100%
Wind: NE @ 10G17 kts
Sea-level pressure: 1028.2 mb; 30.36 in. Hg; rising unsteadily
Visibility: 1/8 mile, fog
6-hr Max temp: 62F
6-hr Min temp: 60F
24-hr Precip: 0.03 ins.
BHO SA 1155 X W2 1/8F 282/62/62/041017/036/ 8//// 52010 70003 10062 20060
10 A.M.
Weather: Sky Obscured, Vertical Visibility 200 feet, Fog
Temperature: 62F; Dew Point: 62F; Relative Humidity: 100%
Wind: ENE @ 10G19 kts
Sea-level pressure: 1028.1 mb; 30.36 in Hg; rising, then falling
Visibility: 1/8 mile, fog
3-hr Precip: Trace
BHO SA 1455 X W2 1/8F 281/62/62/0610G19/036/ 8//// 58001 6000/
1 P.M.
Weather: Overcast Stratus, Fog
Temperature: 64F, Dew point: 62; Relative Humidity: 93%
Wind: ENE @ 10G16 kts
Sea-level pressure: 1026.1 mb; 30.30 in Hg; falling, then falling more rapidly
Visibility: 5 miles
6-hr Max temp: 66F
6-hr Min temp: 62F
6-hr Precip: Trace
BHO SA 1755 90 OVC 5F 263/64/62/0610G16/031/ 8/6// 58018 6000/ 10066 20062
SUMMARY FOR THURSDAY, SEPTEMBER 16, 2021
TEMPERATURE (DEGREES F)
MAX…….69 NORMAL…..73
MIN…….61 NORMAL…..56
MEAN……65 NORMAL…..64
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+1
TOTAL DEPARTURE FOR THE MONTH…………………….+3 [-0.0 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE MONTH……………10 DEPARTURE…….-18
TOTAL HEATING UNITS FOR THE SEASON…………..38 DEPARTURE……..-8
TOTAL HEATING UNITS LAST SEASON TO DATE………29 DEPARTURE……..+9
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH……………41 DEPARTURE…….-15
TOTAL COOLING UNITS FOR THE SEASON………….691 DEPARTURE…….+40
TOTAL COOLING UNITS LAST SEASON TO DATE……..805 DEPARTURE……-114
PEAK WIND GUST (MPH):
Official……………….24 ENE @ 2:51 P.M.
AEROVANE (south tower)…..24 ENE @ 2:51 P.M.
VECTOR #2 (south tower)….26 @ 2:51 P.M.
DAVIS #2 (south tower)…..23 NE @ 2:18 P.M.
ASOS………..OUT OF SERVICE D/T RENOVATIONS
VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
RMY…………OUT OF SERVICE D/T RENOVATIONS
MERLIN………OUT OF SERVICE D/T RENOVATIONS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 NE @ 2:20 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17 @ 2:15 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 ENE @ 2:16 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE…….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY AVERAGE……..OUT OF SERVICE D/T RENOVATIONS
*LAST OF TWO OCCURRENCES
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….8.3 NE [200 total miles]
VECTOR #2……………..9.1
DAVIS #2………………8.9 ENE
RMY……………..OUT OF SERVICE D/T RENOVATIONS
ASOS…………….OUT OF SERVICE D/T RENOVATIONS
VECTOR #1………..OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…………OUT OF SERVICE D/T RENOVATIONS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.03 DEPARTURE….-0.12
TOTAL PRECIPITATION FOR THE MONTH………….5.31 DEPARTURE….+3.34
TOTAL PRECIPITATION FOR THE YEAR………….45.65 DEPARTURE….+9.33
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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
09/01 68/56/62/-7/1.47/000/00 34 NNE AERO 37 NNE RMY N/A
09/02 71/55/63/-6/2.53/322/41 49 ENE AERO 52 ENE RMY N/A
09/03 72/52/62/-6/0.00/735/94 23 NW AERO 23 NW RMY N/A
09/04 76/55/66/-2/0.00/757/97 22 WNW AERO 21 WNW RMY N/A
09/05 72/60/66/-2/0.04/008/01 27 S AERO 29 S RMY N/A
09/06 80/61/71/+3/0.00/…/.. 24 WNW AERO 25 WNW RMY N/A
09/07 78/57/68/+1/0.00/…/.. 23 WSW AERO 22 WSW RMY N/A
09/08 81/61/71/+4/0.00/…/.. 43 S AERO 45 S RMY N/A
09/09 71/64/68/+1/0.90/…/.. 33 S AERO 36 S RMY N/A
09/10 74/55/65/-1/0.04/…/.. 31 NW AERO 32 WNW RMY N/A
09/11 75/51/63/-3/0.00/…/.. 24 SW AERO 24 SW RMY N/A
09/12 79/60/70/+4/0.00/…/.. 33 SW AERO 32 SW RMY N/A
09/13 77/62/70/+5/0.06/…/.. 22 NW AERO 23 NW RMY N/A
09/14 75/59/67/+2/0.00/…/.. 23 S AERO 25 S RMY N/A
09/15 82/65/74/+9/T/…/.. 32 SSW AERO 35 SSW RMY N/A
09/16 69/61/65/+1/0.27/…/.. 24 ENE AERO 24 ENE RMU N/A
09/17 The low since midnight is 60F, the daily normal low is 55F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR SEPTEMBER 17
HIGH 87F IN 2015
LOW 38F IN 1959
PRECIP 2.73 INCHES IN 1933
PEAK GUST 60 MPH WNW IN 1999
RECORDS FOR SEPTEMBER 18
HIGH 88F IN 1906
LOW 36F IN 1919
PRECIP 4.25 INCHES IN 1996
PEAK GUST 77e MPH WNW IN 1948
TODAY’S REPORT PREPARED BY: Andrew Swanson
