Wednesday, September 6, 2023

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

WEDNESDAY, SEPTEMBER 6, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0514E
SUNSET:  1810E

CONTINUED QUITE HUMID WITH VERY WARM TEMPERATURES….

Yet another day with mainly sunny skies, but it is quite warm
and humid today with temperatures pushing into the mid and
upper 80s and the dew point around 70. This is definitely
making for an uncomfortable day today.

To make matters worse, there really isn’t much air movement
either. The wind has been rather light with an average speed
of only around 8mph. The highest gust so far today is around
17mph which occurred just before 3:30 this morning.

Visibility has been limited to around 10-15 miles all day due
to haziness.

The maximum temperature so far today has been 86F, which is
10 degrees above the normal high of 76F. The minimum temperature
since midnight is 70F, which is 11 degrees above the normal low
of 59F.

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Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus/castellanus distant SE-SW
Temperature: 73F; Dew Point: 71F; Relative Humidity: 93%
Wind: N @ 8 kts
Sea-level pressure: 1011.6 mb; 29.87 in. Hg: rising, then more slowly
Visibility: 10 miles, thin fog
6-hr Max temp: 73F
6-hr Min temp: 70F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 10 116/73/71/0108/987/ FEW AC/ACC DSNT SE-SW
THN F ALQDS/ 8/080 51005 10073 20070

10 A.M.
Weather: Clear, few cumulus distant WSW-W
Temperature: 80F; Dew Point: 68F; Relative Humidity: 69%
Wind: ENE @ 4 kts, wind light
Sea-level pressure: 1011.4 mb; 29.87 in. Hg: steady, then falling
Visibility: 15 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 15 114/80/68/0704/987/ FEW CU DSNT WSW-W HAZY
WND LGT/ 8/200 58002

1 P.M.
Weather: Scattered cumulus
Temperature: 86F; Dew Point: 71F; Relative Humidity: 62%
Wind: W @ 2 kts, wind light and variable
Sea-level pressure: 1009.9 mb; 29.82 in. Hg: falling, then more rapidly
Visibility: 10 miles, hazy
6-hr Max temp: 86F
6-hr Min temp: 73F
6-hr Precip: 0.00 inches
BHO SA 1755 35 SCT 10 099/86/71/2702/982/ HAZY WND L/V/
8/200 58015 10086 20073

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SUMMARY FOR TUESDAY, SEPTEMBER 5, 2023

TEMPERATURE (DEGREES F)
MAX…….86   NORMAL…..77
MIN…….68   NORMAL…..59
MEAN……77   NORMAL…..68

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+9
TOTAL DEPARTURE FOR THE MONTH…………………+16 [+3.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH…………….2  DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE SEASON……………3  DEPARTURE…….-20
TOTAL HEATING UNITS LAST SEASON TO DATE……….2  DEPARTURE……..+1

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY……………12  DEPARTURE……..+8
TOTAL COOLING UNITS FOR THE MONTH……………35  DEPARTURE…….+13
TOTAL COOLING UNITS FOR THE SEASON………….605  DEPARTURE…….-13
TOTAL COOLING UNITS LAST SEASON TO DATE……..857  DEPARTURE……-252

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)……….E16 NNE  @  09:37 A.M.
VECTOR #1 (1-Sec)……….16 ENE  @  11:50 A.M.
VECTOR #2 (1-Sec)……….16 NE   @  09:38 A.M.
DAVIS #1……………….16 ENE  @  10:47 A.M.
DAVIS #2 ………………15 NNE  @  09:38 A.M.
RMY #1 (Instantaneous)…..16 NNE  @  09:37 A.M.
RMY #2 (Instantaneous)…..16 NE   @  09:38 A.M.
MERLIN…………………15 NNE
RICHARDS (C5C) (Inst)……15      @  09:37 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………12 NNW  @  05:51 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..12      @  06:20 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..12      @  06:20 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………12 N    @  06:20 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………12 N    @  05:56 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..12 N    @  06:06 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..12 N    @  06:19 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………12      @  06:06 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..6.6 ENE [158 total miles] VECTOR #1………………7.1
VECTOR #2………………7.4
DAVIS #1……………….7.1 ENE
DAVIS #2……………….7.2 ENE
RMY #1…………………7.2 NE
RMY #2…………………7.4 NE
RICHARDS (C5C)………….7.5

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH………….TRACE DEPARTURE…..-0.58
TOTAL PRECIPITATION FOR THE YEAR…………..40.45 DEPARTURE…..+5.26

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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/…/..             23 SSW VEC1 22 SSW RMY 21
9/2   79/56/68/-1/0.00/…/..             25 SW  VEC1 24 SW  RMY 26
9/3   85/61/73/+5/T/…/..                21 SW  VEC1 21 SW  RMY 21
9/4   85/68/77/+9/0.00/…/..             17 NW  VEC1 16 NW  RMY 16
9/5   86/68/77/+9/0.00/…/..             16 NNE VEC1 16 ENE RMY 16

9/6 The low since midnight is 70F, the daily normal low is 59F

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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR SEPTEMBER 6
HIGH 92F IN 1900, 2018
LOW 39F IN 1888
PRECIP 3.19 INCHES IN 1890
PEAK GUST 78e MPH SE IN 1979 (TROPICAL STORM DAVID)

RECORDS FOR SEPTEMBER 7
HIGH 92F IN 2007, 2015
LOW 40F IN 1888
PRECIP 2.91 INCHES IN 1891
PEAK GUST 58e MPH W IN 1941

TODAY’S REPORT PREPARED BY: Matt Douglas