Tuesday, September 12, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, SEPTEMBER 12, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0521E
SUNSET: 1800E
ANOTHER MAINLY CLOUDY DAY, CONTINUED WARM AND HUMID….
Yet another day that started with dense fog here on the summit
of Blue Hill. Visibility was down as low as 1/16th of a mile
at times. The fog finally lifted mid morning, but mainly cloudy
skies remained with a few sprinkles here and there.
The temperature has been held down today due to the cloud cover,
with readings reaching the mid 70s. The dew point remains on the
high side with readings once again in the upper 60s.
Like a broken record, the wind has once again been on the light
side. The average speed for the day is only around 4mph. The peak
gust so far, which occurred around just after midnight, is
around 17mph.
As mentioned, the visibility started the day quite limited due
to fog, but has improved markedly as we moved through the late
morning and early afternoon hours. Views have reached as high as
40 miles today!
The maximum temperature so far today has been 76F, which is
2 degrees above the normal high of 74F. The minimum temperature
since midnight is 65F, which is 8 degrees above the normal low
of 57F.
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Today’s Observations:
7 A.M.
Weather: Sky partially obscured, overcast stratus, few thin spots
in overcast, sun occasionally dimly visible
Temperature: 67F; Dew Point: 67F; Relative Humidity: 100%
Wind: NNW @ 5 kts, wind light
Sea-level pressure: 1016.7 mb; 30.02 in. Hg: rising, then more rapidly
Visibility: 1/4 mile, fog
6-hr Max temp: 67F
6-hr Min temp: 65F
24-hr Precip: 0.64 inches
BHO SA 1155 -X E2 OVC 1/4F 167/67/67/3305/002/ FEW THN SPTS IOVC
SUN OCNLY DMLY VSBL WND LGT/ 8/6// 53009 70064 10067 20065
10 A.M.
Weather: Broken stratocumulus, overcast stratus, very light drizzle
Temperature: 70F; Dew Point: 68F; Relative Humidity: 94%
Wind: NW @ 2 kts, wind light
Sea-level pressure: 1017.1 mb; 30.03 in. Hg: falling, then rising
Visibility: 40 miles, 10 miles N-ENE
3-hr Precip: Trace
BHO SA 1455 E4 BKN 12 OVC 40L- 171/70/68/3102/003/ FEW LWR STFRA ALQDS
PCPN VRY LGT L-B55 VSBY 10 N-ENE WND LGT/ 8/6// 53004 6000/
1 P.M.
Weather: Scattered cumulus, broken stratocumulus, thin broken cirrus,
few lower stratus fractus all quadrants
Temperature: 75F; Dew Point: 68F; Relative Humidity: 79%
Wind: WNW @ 4 kts, wind light
Sea-level pressure: 1015.9 mb; 30.00 in. Hg: falling, then more rapidly
Visibility: 40 miles
6-hr Max temp: 76F
6-hr Min temp: 67F
6-hr Precip: Trace
BHO SA 1755 17 SCT E45 BKN 250 -BKN 40 159/75/68/2904/000/
FEW LWR STFRA ALQDS WND LGT/ 8/801 58012 6000/ 10076 20067
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SUMMARY FOR MONDAY, SEPTEMBER 11, 2023
TEMPERATURE (DEGREES F)
MAX…….74 NORMAL…..75
MIN…….67 NORMAL…..57
MEAN……71 NORMAL…..66
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+5
TOTAL DEPARTURE FOR THE MONTH…………………+76 [+6.7 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE MONTH…………….2 DEPARTURE…….-13
TOTAL HEATING UNITS FOR THE SEASON……………3 DEPARTURE…….-30
TOTAL HEATING UNITS LAST SEASON TO DATE……….7 DEPARTURE……..-4
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….6 DEPARTURE……..+3
TOTAL COOLING UNITS FOR THE MONTH…………..106 DEPARTURE…….+63
TOTAL COOLING UNITS FOR THE SEASON………….676 DEPARTURE…….+37
TOTAL COOLING UNITS LAST SEASON TO DATE……..870 DEPARTURE……-194
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)……….E15 E @ 11:41 P.M.
VECTOR #1 (1-Sec)……….15 E @ 11:41 P.M.
VECTOR #2 (1-Sec)……….13 ENE @ 11:25 P.M.
DAVIS #1……………….14 E @ 11:41 P.M.
DAVIS #2 ………………13 E @ 01:39 P.M.
RMY #1 (Instantaneous)…..14 NE @ 12:03 P.M.
RMY #2 (Instantaneous)…..13 ENE @ 11:25 P.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……13 @ 11:41 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL……………….8 E @ 11:41 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE……………9 @ 03:43 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..10 @ 11:36 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………10 E @ 01:59 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………10 E @ 11:37 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE………………9 ENE @ 01:36 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..10 E @ 11:37 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………10 @ 11:41 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..4.5 ENE [107 total miles]
VECTOR #1………………4.9
VECTOR #2………………5.3
DAVIS #1……………….4.7 ENE
DAVIS #2……………….4.7 E
RMY #1…………………5.1 ENE
RMY #2…………………5.3 ENE
RICHARDS (C5C)………….5.6
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.64 DEPARTURE…..+0.52
TOTAL PRECIPITATION FOR THE MONTH…………..1.38 DEPARTURE…..+0.07
TOTAL PRECIPITATION FOR THE YEAR…………..41.83 DEPARTURE…..+5.91
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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/…/.. 20 SSW VEC1 21 SSW RMY 21
9/8 86/70/78/+11/0.00/…/.. 30 SSW VEC1 31 SSW RMY 32 TSTM
9/9 86/68/77/+10/0.49/…/.. 30 S VEC1 31 S RMY 29 TSTM
9/10 78/67/73/+7/0.25/…/.. 17 NE VEC1 17 NE RMY 15 TSTM
9/11 74/67/71/+5/0.64/…/.. 15 E VEC1 15 E RMY 14 TSTM
9/12 The low since midnight is 65F, the daily normal low is 57F
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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 12
HIGH 92F IN 1961
LOW 42F IN 1958,1967,1985
PRECIP 2.79 INCHES IN 1960 (HURRICANE DONNA)
PEAK GUST 140 MPH SSE IN 1960 (HURRICANE DONNA)
RECORDS FOR SEPTEMBER 13
HIGH 91F IN 1957
LOW 40F IN 1985
PRECIP 3.10 INCHES IN 1987
PEAK GUST 44 MPH WNW IN 1986
TODAY’S REPORT PREPARED BY: Matt Douglas
