Monday, September 25, 2023

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

MONDAY, SEPTEMBER 25, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0535E
SUNSET:  1737E

OVERCAST, CHILLY, AND RAW WITH OCCASIONAL LIGHT RAIN CONTINUING…

Today marks the 3rd day in a row without any sunshine being
recorded. Clouds have persisted today with occasional light rain
and drizzle being the theme. A total of 1.06″ of rain has been
recorded from this drawn-out storm system, the remnants of
Tropical Storm Ophelia. The heaviest of the rain fell yesterday
afternoon with 0.31″ falling in 1 hour between 2-3pm.

With the persistent clouds and brisk wind off the ocean,
temperatures haven’t had much range between the diurnal cycles.
Readings have generally been stuck in the mid to upper 50s.

The wind has been mainly out of a east-northeast direction with
an average speed of around 14mph. Frequent gusts over 25mph
have been occurring with a peak of 32mph occurring just before
8am.

Visibility has been limited today with the light rain and drizzle
around. It has generally ranged between 10-20 miles with some
periods of lower visibility during periods of a bit heavier rain-
fall.

The maximum temperature so far today has been 60F, which is
9 degrees below the normal high of 69F. The minimum temperature
since midnight is 55F, which is 3 degrees above the normal low
of 52F.

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Today’s Observations:

7 A.M.
Weather: Scattered stratus fractus, scattered stratocumulus,
overcast altostratus
Temperature: 57F; Dew Point: 56F; Relative Humidity: 96%
Wind: ENE @ 14G25 kts, peak wind ENE 30mph at 6:14 A.M.
Sea-level pressure: 1020.0 mb; 30.12 in. Hg: rising, then more rapidly
Visibility: 20 miles, thin fog
6-hr Max temp: 57F
6-hr Min temp: 57F
24-hr Precip: 0.72 inches
BHO SA 1455 12 SCT 45 SCT 70 OVC 20 200/57/56/0614G25/012/ THN F ALQDS
L-B08E48 PK WND 0626/14/ 8/72/ 53014 6000/ 70072 10057 20057

10 A.M.
Weather: Broken stratus fractus, broken stratocumulus,
overcast nimbostratus, very light rain
Temperature: 57F; Dew Point: 57F; Relative Humidity: 99%
Wind: ENE @ 12G20 kts
Sea-level pressure: 1021.7 mb; 30.17 in. Hg: rising then falling
Visibility: 15 miles, thin fog
3-hr Precip: 0.05 inches
BHO SA 1455 E10 BKN 45 BKN 90 OVC 15R- 217/57/57/0612G20/017/
THN F ALQDS PCPN VRY LGT/ 8/72/ 50017 6005/

1 P.M.
Weather: Broken stratus fractus, broken stratocumulus,
overcast nimbostratus, light rain
Temperature: 57F; Dew Point: 57F; Relative Humidity: 99%
Wind: ENE @ 12G24 kts
Sea-level pressure: 1023.3 mb; 30.22 in. Hg: rising, then more rapidly
Visibility: 10 miles, thin fog
6-hr Max temp: 60F
6-hr Min temp: 55F
6-hr Precip: 0.06 inches
BHO SA 1755 E8 BKN 17 BKN 80 OVC 10R- 233/57/57/0612G24/022/
THN F ALQDS/ 8/72/ 53016 6006/ 10060 20055

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SUMMARY FOR SUNDAY, SEPTEMBER 24, 2023

TEMPERATURE (DEGREES F)
MAX…….60   NORMAL…..70
MIN…….56   NORMAL…..53
MEAN……58   NORMAL…..61

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-3
TOTAL DEPARTURE FOR THE MONTH…………………+70 [+2.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….7  DEPARTURE……..+2
TOTAL HEATING UNITS FOR THE MONTH……………41  DEPARTURE…….-21
TOTAL HEATING UNITS FOR THE SEASON…………..42  DEPARTURE…….-38
TOTAL HEATING UNITS LAST SEASON TO DATE………65  DEPARTURE…….-23

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH…………..119  DEPARTURE…….+50
TOTAL COOLING UNITS FOR THE SEASON………….689  DEPARTURE…….+24
TOTAL COOLING UNITS LAST SEASON TO DATE……..884  DEPARTURE……-195

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)……….E30 ENE  @  04:44 P.M.
VECTOR #1 (1-Sec)……….30 ENE  @  04:36 P.M.
VECTOR #2 (1-Sec)……….30 ENE  @  04:47 P.M.
DAVIS #1……………….28 ENE  @  01:30 A.M.
DAVIS #2 ………………29 E    @  06:13 P.M.
RMY #1 (Instantaneous)…..29 ENE  @  04:44 P.M.
RMY #2 (Instantaneous)…..30 ENE  @  04:47 P.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……28      @  04:51 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 ENE  @  04:03 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18      @  12:13 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..21      @  12:29 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 ENE  @  12:13 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………21 E    @  12:29 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 ENE  @  12:13 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..21 ENE  @  12:29 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………19      @  12:13 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..14.1 ENE [338 total miles] VECTOR #1………………12.8
VECTOR #2………………14.4
DAVIS #1……………….14.4 ENE
DAVIS #2……………….14.4 E
RMY #1…………………13.1 ENE
RMY #2…………………14.0 ENE
RICHARDS (C5C)………….13.5

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.72 DEPARTURE…..+0.58
TOTAL PRECIPITATION FOR THE MONTH…………..6.07 DEPARTURE…..+2.92
TOTAL PRECIPITATION FOR THE YEAR…………..46.52 DEPARTURE…..+8.76

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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/-5/0.00/465/62             36 N   VEC1 35 N   RMY 35
9/16  68/54/61/-3/0.21/022/03             44 WNW VEC1 44 WNW RMY 47
9/17  76/53/65/+1/0.00/685/92             26 WNW VEC1 25 WNW RMY 24
9/18  64/60/62/-1/1.56/000/00             33 WNW VEC1 33 WNW RMY 35 TSTM
9/19  70/56/63/0/0.00/665/90              35 WNW VEC1 37 WNW RMY 36
9/20  72/53/63/0/0.00/714/97              21 WNW VEC1 21 WNW RMY 22
9/21  71/52/62/0/0.00/661/90              17 NNW VEC1 17 NNW RMY 17
9/22  68/54/61/-1/0.00/570/78             23 E   VEC1 21 E   RMY 22
9/23  58/54/56/-6/0.24/000/00             30 NE  VEC1 30 NE  RMY 27
9/24  60/56/58/-3/0.73/000/00             30 ENE VEC1 30 ENE RMY 29

9/25 The low since midnight is 57, the daily normal low is 52F

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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 25
HIGH 87F IN 1970
LOW 31F IN 1950
PRECIP 2.68 INCHES IN 1961
PEAK GUST 63 MPH SSW IN 1991

RECORDS FOR SEPTEMBER 26
HIGH 91F IN 2007
LOW 36F IN 1905,1922,1978
PRECIP 3.84 INCHES IN 1888
PEAK GUST 54e MPH S IN 1977

TODAY’S REPORT PREPARED BY: Matt Douglas