Saturday, September 16, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, SEPTEMBER 16, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0525E
SUNSET: 1752E
HURRICANE LEE BROUGHT SOME WIND, WITH LOWER THAN EXPECTED RAINFALL….
The air thankfully kept its crispness despite Hurricane Lee passing
us by. Temperatures dropped into the low to mid 50s this morning
with a dew point that rose into the lower 50’s. Is it bold to say
that this is the official beginning to Fall?
We measured a grand total of 0.20 inches of rainfall, which is relatively
little compared to the events earlier this week.
The wind has been very busy today averaging at around 20mph. Frequent
gusts over 30 mph have been occurring this afternoon with a peak
so far of around 40 mph.
Visibility has been good at 70 miles this afternoon, starting from a
foggy 10 miles this morning.
The maximum temperature so far today has been 65F, which is
8 degrees below to the normal high of 73F. The minimum temperature
since midnight is 54F, which is 2 degrees below the normal low
of 56F.
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Today’s Observations:
7 A.M.
Weather: Overcast nimbostratus, light rain
Temperature: 54F; Dew Point: 53F; Relative Humidity: 96%
Wind: WNW @ 16G24 kts
Sea-level pressure: 1005.8 mb; 29.70 in. Hg: falling unsteadily
Visibility: 10 miles, thin fog
6-hr Max temp: 59F
6-hr Min temp: 54F
24-hr Precip: 0.17 inches
BHO SA 1155 E70 OVC 10R- 058/54/53/3016G24/970/ THN F ALQDS/ 8/07/
57017 70017 10059 20054
10 A.M.
Weather: Scattered stratocumulus, Overcast nimbostratus, very light rain
Temperature: 59F; Dew Point: 51F; Relative Humidity: 75%
Wind: WNW @ 18G30 kts, peak of 34 kts (39 MPH) WNW at 9:30 A.M.
Sea-level pressure: 1005.3 mb; 29.68 in. Hg: Falling then rising
Visibility: 60 miles
3-hr Precip: 0.03 inches
BHO SA 1455 20 SCT E70 OVC 60R- 053/59/51/3018G30/968/ PCPN VRY LGT
PK WND 3034/30/ 55006 6003/
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: 1005.5 mb; 30.03 in. Hg: falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 65F
6-hr Min temp: 54F
6-hr Precip: 0.03 inches
BHO SA 1755 E70 OVC 70 055/65/49/3019G30/969/ FEW STFRA ALQDS
PK WND 3035/49/ 52002 6003/ 10065 20054
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SUMMARY FOR FRIDAY, SEPTEMBER 15, 2023
TEMPERATURE (DEGREES F)
MAX…….66 NORMAL…..73
MIN…….53 NORMAL…..56
MEAN……60 NORMAL…..65
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-5
TOTAL DEPARTURE FOR THE MONTH…………………+83 [+5.3 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….5 DEPARTURE……..+2
TOTAL HEATING UNITS FOR THE MONTH…………….7 DEPARTURE…….-18
TOTAL HEATING UNITS FOR THE SEASON……………8 DEPARTURE…….-35
TOTAL HEATING UNITS LAST SEASON TO DATE………11 DEPARTURE……..-3
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH…………..119 DEPARTURE…….+66
TOTAL COOLING UNITS FOR THE SEASON………….689 DEPARTURE…….+40
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)……….E35 N @ 10:51 P.M.
VECTOR #1 (1-Sec)……….35 N @ 10:19 P.M.
VECTOR #2 (1-Sec)……….37 N @ 10:12 P.M.
DAVIS #1……………….32 NNE @ 8:50 P.M.
DAVIS #2 ………………34 N @ 9:19 P.M.
RMY #1 (Instantaneous)…..38 N @ 8:50 P.M.
RMY #2 (Instantaneous)…..37 N @ 10:12 P.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……34 @ 08:01 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………23 N @ 10:15 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..24 @ 10:19 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..24 @ 10:12 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………24 N @ 8:50 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 NNE @ 10:14 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..23 N @ 10:14 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 NW @ 10:14 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………21 @ 11:54 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..14.1 N [338 total miles]
VECTOR #1………………13.7
VECTOR #2………………14.1
DAVIS #1……………….14.0 NNE
DAVIS #2……………….13.9 NE
RMY #1…………………13.9 N
RMY #2…………………13.7 NNE
RICHARDS (C5C)………….13.7
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.17 DEPARTURE…..+0.04
TOTAL PRECIPITATION FOR THE MONTH…………..3.47 DEPARTURE…..+1.64
TOTAL PRECIPITATION FOR THE YEAR…………..43.92 DEPARTURE…..+7.48
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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 66/53/60/-5/0.00/…/.. 35 N VEC1 35 N RMY 35
9/16 The low since midnight is 54F, 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 16
HIGH 91F IN 1939,1941
LOW 39F IN 1984
PRECIP 5.12 INCHES IN 1933 (Hurricane)
PEAK GUST 59 MPH SSE IN 1999
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
TODAY’S REPORT PREPARED BY: Benjamin Turner
