Monday, September 19, 2022

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

MONDAY, SEPTEMBER 19, 2022
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0528E
SUNSET: 1747E

BACKDOOR COLD FRONT BRINGS ONSHORE FLOW AND MUCH COOLER AIR….

A backdoor cold front moved through overnight bringing cooler
air from the Gulf of Maine into the region. A few light rain
showers preceded the front last evening leaving 0.04″ of rain
in the gauge.

Today has been overcast with a cool breeze coming in off the
ocean. Temperatures have been held in the low 60s, a good
18-20 degrees cooler than yesterday afternoon here on the Hill.
The high for the day however was back at midnight when it was
66F degrees.

The wind was gusty this morning, but has since diminished into
this afternoon. A peak gusts of 22mph was measured just after
6am this morning. The wind has only been averaging under 10mph
since late this morning.

Visibility has been limited to 15 miles or less due to various
degrees of fog.

The high so far today is 66F, which is 6 degrees below the
normal maximum of 72F. The low since midnight is 56F, which is
1 degrees above the normal minimum of 55F.

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Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 200ft, light drizzle
Temperature: 57F; Dew Point: 57F; Relative Humidity: 100%
Wind: ENE @ 9G16 kts
Sea-level pressure: 1015.5 mb; 29.99 in. Hg: rising, then more rapidly
Visibility: 1/4 mile, fog
6-hr Max temp: 66F
6-hr Min temp: 56F
24-hr Precip: 0.04 ins.
BHO SA 1155 X W2 1/4L-F 155/57/57/0709G16/999/ 8//// 53015 6000/
70004 10066 20056

10 A.M.
Weather: Overcast stratus
Temperature: 60F; Dew Point: 58F; Relative Humidity: 93%
Wind: E @ 8 kts
Sea-level pressure: 1015.7 mb; 29.99 in Hg: rising, then more slowly
Visibility: 6 miles, fog
3-hr Precip: Trace
BHO SA 1455 E3 OVC 6F 157/60/58/0908/999/ 8/6// 51002 6000/

1 P.M.
Weather: Overcast stratus
Temperature: 62F, Dew point: 59F; Relative Humidity: 89%
Wind: ESE @ 5 kts, wind light
Sea-level pressure: 1014.1 mb; 29.95 in Hg: falling, then more rapidly
Visibility: 15 miles, thin fog
6-hr Max temp: 63F
6-hr Min temp: 57F
6-hr Precip: 0.00 ins.
BHO SA 1755 E4 OVC 15 141/62/59/1105/995/ THN F ALQDS WND LGT/
8/6// 58016 6000/ 10063 20057

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SUMMARY FOR SUNDAY, SEPTEMBER 18, 2022

TEMPERATURE (DEGREES F)
MAX…….81 NORMAL…..72
MIN…….57 NORMAL…..55
MEAN……69 NORMAL…..63

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+6
TOTAL DEPARTURE FOR THE MONTH…………………..0 [-0.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE MONTH……………23 DEPARTURE…….-12
TOTAL HEATING UNITS FOR THE SEASON…………..23 DEPARTURE…….-30
TOTAL HEATING UNITS LAST SEASON TO DATE………40 DEPARTURE…….-17

COOLING DEGREE DAYS (SEASON: JAN 2022 THRU DEC 2022)
TOTAL COOLING UNITS FOR YESTERDAY…………….4 DEPARTURE……..+2
TOTAL COOLING UNITS FOR THE MONTH……………48 DEPARTURE…….-12
TOTAL COOLING UNITS FOR THE SEASON………….884 DEPARTURE……+229
TOTAL COOLING UNITS LAST SEASON TO DATE……..696 DEPARTURE……+188

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….28 WSW @ 12:50 P.M.
AEROVANE……………….N/A
VECTOR #2 (Instantaneous)..30 @ 12:50 P.M.
DAVIS #2 ………………28 WSW @ 12:50 P.M.
RMY #2 (Instantaneous)…..29 WSW @ 12:48 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 #1………OUT OF SERVICE D/T RENOVATIONS
MERLIN………OUT OF SERVICE D/T RENOVATIONS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 WSW @ 12:52 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20 @ 12:53 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………21 WSW @ 12:53 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 WSW @ 12:53 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 #1 AVERAGE……OUT OF SERVICE D/T RENOVATIONS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..12.8 WSW [306 total miles] VECTOR #2………………13.5
DAVIS #2……………….13.6 WSW
RMY #2…………………13.4 WSW
RMY #1……….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……..0.04 DEPARTURE…..-0.10
TOTAL PRECIPITATION FOR THE MONTH…………..2.83 DEPARTURE…..+0.57
TOTAL PRECIPITATION FOR THE YEAR…………..26.41 DEPARTURE….-10.46

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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

9/1 78/59/69/0/0.00/757/96 36 WNW AERO N/A RMY 37
9/2 73/53/63/-6/0.00/762/97 19 N AERO N/A RMY 19
9/3 80/59/70/+2/0.00/673/86 23 S AERO N/A RMY 24
9/4 86/61/74/+6/0.00/554/71 20 SSW AERO N/A RMY 20
9/5 75/60/68/0/0.83/000/00 20 E AERO N/A RMY 19
9/6 63/60/62/-6/1.57/000/00 27 NE AERO N/A RMY 26
9/7 70/57/64/-3/T/309/40 22 NE AERO N/A RMY 21
9/8 71/56/64/-3/0.01/684/89 20 ENE AERO N/A RMY 20
9/9 77/55/66/-1/0.00/513/67 19 WNW AERO N/A RMY 19
9/10 85/61/73/+7/0.00/657/86 22 NW AERO N/A RMY 21
9/11 76/62/69/+3/0.06/015/02 22 WSW AERO N/A RMY 23
9/12 74/62/68/+2/0.04/121/16 14 WSW AERO N/A RMY 15
9/13 74/66/70/+5/0.28/…/.. 22 W AERO N/A RMY 22
9/14 78/56/67/+2/0.00/…/.. 29 WNW AERO N/A RMY 29
9/15 70/52/61/-4/0.00/…/.. 33 NW AERO N/A RMY 33
9/16 70/47/59/-5/0.00/…/.. 24 NNW AERO N/A RMY 24
9/17 70/47/59/-5/0.00/…/.. 24 SSW AERO N/A RMY 24
9/18 81/57/69/+6/0.04/…/.. 28 WSW AERO N/A RMY 29