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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, SEPTEMBER 15, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0524E
SUNSET: 1754E
INCREASING CLOUDS AHEAD OF HURRICANE LEE, MUCH COOLER AND BREEZY….
The air has a crispness to it that can only mean that fall has
arrived. Temperatures dropped into the low to mid 50s this morning
with a dew point that dipped into the upper 40s. A far cry from
the tropical-like air we’d experienced over the last couple of
weeks.
Mainly high clouds are on the increase today as Hurricane Lee
gradually approaches our latitude. It is expected to bring some
gusty winds and rain showers to the area tomorrow, but for now
we get to enjoy a nice dry day today. Temperatures have only
recovered to the mid 60s early this afternoon.
The wind has been busy today averaging at around 13mph. Frequent
gusts over 25mph have been occurring most of the day with a peak
so far of around 31mph.
Visibility has been excellent all day with views of around
70 miles!
The maximum temperature so far today has been 66F, which is
8 degrees below to the normal high of 74F. The minimum temperature
since midnight is 53F, which is 3 degrees below the normal low
of 56F.
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Today’s Observations:
7 A.M.
Weather: Broken cirrus, few stratocumulus NE-SE, few altocumulus
all quadrants
Temperature: 55F; Dew Point: 49F; Relative Humidity: 78%
Wind: NNE @ 14G22 kts
Sea-level pressure: 1019.9 mb; 30.12 in. Hg: rising then steady
Visibility: 70 miles
6-hr Max temp: 57F
6-hr Min temp: 53F
24-hr Precip: 0.00 inches
BHO SA 1155 E250 BKN 70 199/55/49/0214G22/012/ FEW SC NE-SE
FEW AC ALQDS/ 8/554 51007 10057 20053
10 A.M.
Weather: Scattered stratocumulus, broken cirrus
Temperature: 63F; Dew Point: 51F; Relative Humidity: 64%
Wind: NE @ 12G21 kts
Sea-level pressure: 1019.5 mb; 30.11 in. Hg: falling unsteadily
Visibility: 70 miles
3-hr Precip: 0.00 inches
BHO SA 1455 25 SCT 250 BKN 70 195/63/51/0412G21/011/ 8/504 56004
1 P.M.
Weather: Broken cirrus, few stratocumulus all quadrants
Temperature: 65F; Dew Point: 51F; Relative Humidity: 60%
Wind: ENE @ 14G25 kts, peak wind NE 30mph at 12:34 P.M.
Sea-level pressure: 1017.0 mb; 30.03 in. Hg: falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 66F
6-hr Min temp: 55F
6-hr Precip: 0.00 inches
BHO SA 1755 250 BKN 70 170/65/51/0614G25/003/ FEW SC ALQDS
PK WND 0526/34/ 8/504 58025 10066 20055
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SUMMARY FOR THURSDAY, SEPTEMBER 14, 2023
TEMPERATURE (DEGREES F)
MAX…….75 NORMAL…..74
MIN…….57 NORMAL…..56
MEAN……66 NORMAL…..65
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+1
TOTAL DEPARTURE FOR THE MONTH…………………+88 [+6.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE MONTH…………….2 DEPARTURE…….-21
TOTAL HEATING UNITS FOR THE SEASON……………3 DEPARTURE…….-38
TOTAL HEATING UNITS LAST SEASON TO DATE……….7 DEPARTURE……..-4
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….1 DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH…………..119 DEPARTURE…….+68
TOTAL COOLING UNITS FOR THE SEASON………….689 DEPARTURE…….+42
TOTAL COOLING UNITS LAST SEASON TO DATE……..880 DEPARTURE……-191
PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
E=Estimated
F420C (Official)……….E24 NW @ 08:01 A.M.
VECTOR #1 (1-Sec)……….24 NW @ 08:01 A.M.
VECTOR #2 (1-Sec)……….23 NW @ 09:15 A.M.
DAVIS #1……………….23 NW @ 07:59 A.M.
DAVIS #2 ………………20 NW @ 09:15 A.M.
RMY #1 (Instantaneous)…..24 NW @ 08:01 A.M.
RMY #2 (Instantaneous)…..23 N @ 11:53 P.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……23 @ 08:01 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 N @ 11:46 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 @ 11:54 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 @ 09:18 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 N @ 11:54 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 NW @ 09:18 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..15 N @ 11:54 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 NW @ 09:18 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15 @ 11:54 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..8.7 NW [208 total miles]
VECTOR #1………………8.8
VECTOR #2………………9.3
DAVIS #1……………….8.9 NW
DAVIS #2……………….8.6 NNW
RMY #1…………………8.6 NW
RMY #2…………………9.2 NW
RICHARDS (C5C)………….9.2
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..3.30 DEPARTURE…..+1.60
TOTAL PRECIPITATION FOR THE YEAR…………..43.75 DEPARTURE…..+7.44
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PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY: R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M: Missing data
9/1 73/52/63/-6/0.00/774/98 23 SSW VEC1 22 SSW RMY 21
9/2 79/56/68/-1/0.00/708/90 25 SW VEC1 24 SW RMY 26
9/3 85/61/73/+5/T/674/86 21 SW VEC1 21 SW RMY 21
9/4 85/68/77/+9/0.00/719/92 17 NW VEC1 16 NW RMY 16
9/5 86/68/77/+9/0.00/647/83 16 NNE VEC1 16 ENE RMY 16
9/6 89/70/80/+12/0.00/722/93 17 WSW VEC1 17 SSW RMY 18
9/7 92/72/82/+15/0.00/726/94 20 SSW VEC1 21 SSW RMY 21
9/8 86/70/78/+11/0.00/293/38 30 SSW VEC1 31 SSW RMY 32 TSTM
9/9 86/68/77/+10/0.49/291/38 30 S VEC1 31 S RMY 29 TSTM
9/10 78/67/73/+7/0.25/008/01 17 NE VEC1 17 NE RMY 15 TSTM
9/11 74/67/71/+5/0.64/023/03 15 E VEC1 15 E RMY 14 TSTM
9/12 79/65/72/+6/T/250/33 18 E VEC1 17 E RMY 18
9/13 76/64/70/+5/1.92/242/32 35 SSW VEC1 35 SSW RMY 36 TSTM
9/14 75/57/66/+1/0.00/670/89 24 NW VEC1 24 NW RMY 24
9/15 The low since midnight is 53F, the daily normal low is 56F
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SEPTEMBER DAILY RECORDS
09/07/2023: NEW RECORD HIGH DAILY MINIMUM TEMPERATURE OF 72F;
BEATS THE RECORD OF 70F SET IN 1999
09/07/2023: RECORD HIGH TEMPERATURE OF 92F;
TIES THE RECORD OF 92F SET IN 2007 AND 2015
09/08/2023: RECORD HIGH DAILY MINIMUM TEMPERATURE OF 70F;
TIES THE RECORD OF 70F SET IN 2015
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR SEPTEMBER 15
HIGH 89F IN 1931
LOW 35F IN 1913
PRECIP 3.93 INCHES IN 1904 (Extra-tropical storm making landfall in New England on 9/15/1904 passing east of BHO and bringing a storm total of 4.11 inches 9/14-15/1904)
PEAK GUST 65e MPH NW IN 1944 (In the wake of Great Atlantic Hurricane)
RECORDS FOR SEPTEMBER 16
HIGH 91F IN 1939,1941
LOW 39F IN 1984
PRECIP 5.12 INCHES IN 1933 (Hurricane)
PEAK GUST 59 MPH SSE IN 1999
TODAY’S REPORT PREPARED BY: Matt Douglas
