Monday, September 23, 2024

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

MONDAY, SEPTEMBER 23, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0533E
SUNSET:  1739E

CLOUDS DOMINATE; INTERMITTENT LIGHT DRIZZLE WITH COOL TEMPERATURES….

After being stuck on the “nice” side of the blocking pattern, now
we’re stuck on the unsettled side. Today is yet another day in which
clouds are dominating the sky. Intermittent light drizzle has been
occurring today as the flow remains off the ocean. So far only a trace
has been observed.

Temperatures slowly rose through the 50s this morning, finally
reaching the low 60s early this afternoon. With the dampness in air,
it feels rather chilly today. Definitely a good day for hot soup or
chili!

As mentioned, the wind continues to flow off the ocean, mainly
out of the northeast to east-northeast. It has been gusty at times as
well. The average speed for the day so far is around 10mph. The peak
gust so far is 28mph, which occurred just after 8:30am this morning.

Visibility has been somewhat variable with the areas of drizzle
moving through, but overall it’s been averaging about 30 miles for
most of the day.

The maximum temperature so far today is 62F, which is 8 degrees below
the normal high of 70F. The minimum temperature since midnight is 52F,
which is 1 degree below the normal low of 53F.

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Today’s Observations:

7 A.M.
Weather: Broken stratus fractus, broken stratocumulus,
broken altocumulus/castellanus, few lower stratus fractus distant SSW-NW
Temperature: 56F; Dew Point: 55F; Relative Humidity: 95%
Wind: NE @ 7 kts
Sea-level pressure: 1019.1 mb; 30.09 in. Hg: steady, then rising
Visibility: 30 miles, 20 miles W-WNW, 6 miles SSW-SW, thin fog
6-hr Max temp: 56F
6-hr Min temp: 52F
24-hr Precip:  Trace
BHO SA 1155 E9 BKN 22 BKN 40 BKN 30 191/56/55/0407/009/ FEW LWR STFRA
DSNT SSW-NW THN F ALQDS INTMT L- VIRGA ALQDS VSBY 20 W-WNW 6 SSW-SW/
8/680 53003 6000/ 70000 10056 20052

10 A.M.
Weather: Broken stratocumulus, overcast altostratus, virga all quadrants
Temperature: 60F; Dew Point: 52F; Relative Humidity: 75%
Wind: ENE @ 10G19 kts
Sea-level pressure: 1020.2 mb; 30.13 in. Hg: rising unsteadily
Visibility: 30 miles, hazy
3-hr Precip: Trace
BHO SA 1455 E20 BKN 37 OVC 30 202/60/52/0710G19/013/ VIRGA ALQDS HAZY/
8/52/ 52011 6000/

1 P.M.
Weather: Broken stratocumulus, broken altostratus, overcast cirrus,
few breaks in overcast all quadrants
Temperature: 61F; Dew Point: 54F; Relative Humidity: 78%
Wind: ENE @ 12G23 kts
Sea-level pressure: 1019.7 mb; 30.11 in. Hg: falling, then steady
Visibility: 30 miles, hazy
6-hr Max temp: 62F
6-hr Min temp: 56F
6-hr Precip: Trace
BHO SA 1755 E19 BKN 37 BKN 250 OVC 30 197/61/54/0612G23/011/
FEW BINOVC ALQDS HAZY/ 8/522 56005 6000/ 10062 20056

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SUMMARY FOR SUNDAY, SEPTEMBER 22, 2024

TEMPERATURE (DEGREES F)
MAX…….63  NORMAL…..70
MIN…….54  NORMAL…..53
MEAN……59  NORMAL…..62

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..-3
TOTAL DEPARTURE FOR THE MONTH…………………….+16 [+0.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….6  DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE MONTH……………28  DEPARTURE…….-24
TOTAL HEATING UNITS FOR THE SEASON…………..39  DEPARTURE…….-31
TOTAL HEATING UNITS LAST SEASON TO DATE………26  DEPARTURE…….+13

COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH……………59  DEPARTURE……..-7
TOTAL COOLING UNITS FOR THE SEASON………….753  DEPARTURE…….+91
TOTAL COOLING UNITS LAST SEASON TO DATE……..689  DEPARTURE…….+64

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated

F420C (Official)……….E35 NE   @   01:22 P.M.
VECTOR #1 (1-Sec)……….31 NE   @   01:50 P.M.
VECTOR #2 (1-Sec)……….33 NE   @   02:45 P.M.
DAVIS #1……………….31 NE   @   01:19 P.M.
DAVIS #2 ………………31 NE   @   01:21 P.M.
RMY #1 (Instantaneous)…..34 NE   @   01:22 P.M.
RMY #2 (Instantaneous)…..34 NE   @   01:21 P.M.
MERLIN…………………29 NNE
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………24 NE   @   01:23 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22      @   01:23 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23      @   01:23 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………23 NE   @   01:23 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 ENE  @   01:23 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..21 NE   @   01:23 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 NE   @   01:23 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….10.7 NE [257 total miles] VECTOR #1……………..10.6
VECTOR #2……………..11.1
DAVIS #1………………11.0 NE
DAVIS #2………………10.7 NE
RMY #1………………..10.3 NE
RMY #2………………..10.8 NNE
RICHARDS (C5C)………….OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.15
TOTAL PRECIPITATION FOR THE MONTH…………..1.40 DEPARTURE…..-1.46
TOTAL PRECIPITATION FOR THE YEAR (2024)…….42.61 DEPARTURE…..+5.14

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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   82/67/75/+6/T/244/31                28 SSW VEC1 27 SW  RMY 28
9/2   79/56/68/-1/0.00/644/82             31 NNW VEC1 31 NNW RMY 32
9/3   74/49/62/-6/0.00/766/98             23 NW  VEC1 23 NNW RMY 23
9/4   80/56/68/0/0.00/732/94              18 ESE VEC1 19 SE  RMY 18
9/5   77/58/68/0/0.00/737/95              20 ESE VEC1 19 ESE RMY 19
9/6   73/58/66/-2/0.00/240/31             22 E   VEC1 21 ENE RMY 23
9/7   77/56/67/0/0.04/301/39              34 WNW VEC1 31 WNW RMY 33
9/8   70/50/60/-7/0.00/753/98             35 W   VEC1 35 W   RMY 34
9/9   75/51/63/-4/0.00/727/95             31 WNW VEC1 28 WNW RMY 30
9/10  78/56/67/+1/0.00/717/94             21 NW  VEC1 20 SW  RMY 21
9/11  78/53/66/0/0.00/714/94              20 S   VEC1 19 S   RMY 18
9/12  82/58/70/+4/0.00/711/94             20 S   VEC1 19 S   RMY 20
9/13  85/59/72/+7/0.00/595/79             21 SSW VEC1 20 SSW RMY 20
9/14  81/61/71/+6/0.00/691/92             21 ENE VEC1 20 ENE RMY 21
9/15  78/60/69/+4/0.00/598/80             23 SE  VEC1 23 SE  RMY 25
9/16  83/55/69/+5/0.00/700/94             22 SSW VEC1 21 SSW RMY 21
9/17  83/55/69/+5/0.00/453/61             16 SW  VEC1 14 S   RMY 15
9/18  77/60/69/+6/0.00/163/22             15 W   VEC1 14 W   RMY 14
9/19  69/60/65/+2/0.10/000/00             30 NE  VEC1 30 NE  RMY 31
9/20  64/58/61/-2/0.12/000/00             38 NE  VEC1 38 NE  RMY 40
9/21  58/55/57/-5/1.13/000/00             35 NNE VEC1 31 NNE RMY 31
9/22  63/54/59/-3/0.01/190/26             35 NE  VEC1 31 NE  RMY 34

9/23  The low since midnight is 52F, the daily normal low is 53F.

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SEPTEMBER DAILY RECORDS TO DATE

NONE.

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

RECORDS FOR SEPTEMBER 23
HIGH 93F IN 1895,1914
LOW 33F IN 1904
PRECIP 2.67 INCHES IN 1994
PEAK GUST 62 MPH SSW IN 1989

RECORDS FOR SEPTEMBER 24
HIGH 87F IN 1959
LOW 33F IN 1885,1950,1963
PRECIP 1.19 INCHES IN 1955
PEAK GUST 54e MPH SW IN 1940

TODAY’S REPORT PREPARED BY: Matt Douglas