Sunday, September 24, 2023

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

SUNDAY, SEPTEMBER 24, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0533E
SUNSET:  1738E

RAINY CONDITIONS CONTINUE ON TOP OF GREAT BLUE HILL…

Yesterday’s rainstorm continued into today with light misty
drizzle in the morning and moderate rain in the afternoon.
So far we have measured 0.33 inches since the rain started
yesterday morning just before 10:00 A.M.
With overcast skies continuing from yesterday, temperatures
and dew points have stayed consistent in the high 50’s.
Wind still from the east/ east-northeast has picked up since
yesterday afternoon, and is averaging between 12-13 MPH.
As the rain intensity increased visibility greatly decreased
throughout the day from 15 miles at 7:00 A.M. down to a
1/2 mile at 1:00 P.M.

The maximum temperature so far today has been 60 F, which is
10 degrees below the normal high of 70F. The minimum temperature
since midnight is 58F, which is 5 degrees above the normal low
of 53F.

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Today’s Observations:

7 A.M.
Weather: Scattered stratus fractus, broken stratocumulus,
overcast stratus,light drizzle, precipitation very light
Temperature: 58F; Dew Point: 57F; Relative Humidity: 96%
Wind: Ene @ 12G13 kts
Sea-level pressure: 1022.0 mb; 30.18 in. Hg: steady then rising
Visibility: 15 miles
6-hr Max temp: 58F
6-hr Min temp: 56F
24-hr Precip: 0.28 inches
BHO SA 1155 12 SCT 17 BKN 45 OVC 15L- 220/58/57/0712G13/018/
PCPN VRY LGT / 8/6// 53007 70028 10058 20056

10 A.M.
Weather: Scattered stratus fractus, broken stratocumulus,
overcast stratus, light drizzle, precipitation very light
Temperature: 59F; Dew Point: 58F; Relative Humidity: 96%
Wind: ENE @ 10G11 kts
Sea-level pressure: 1002.2 mb; 30.18 in. Hg: rising then falling
Visibility: 3 miles, fog
3-hr Precip: Trace
BHO SA 1455 13 BKN 20 BKN 35 OVC 3L-F 022/59/58/0710G11/018/
PCPN VRY LGT/ 8/6// 50000 6000/

1 P.M.
Weather: Overcast stratus, rain
Temperature: 58F; Dew Point: 58F; Relative Humidity: 100%
Wind: ENE @ 11G14 kts
Sea-level pressure: 1020.7 mb; 30.14 in. Hg: falling rapidly
Visibility: 1/2 miles, fog
6-hr Max temp: 60F
6-hr Min temp: 58F
6-hr Precip: 0.05 inches
BHO SA 1755 10 OVC 1/2RF 207/58/58/0711G14/014/ PRESFR/ 8/6//
58013 60005 10060 20058

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SUMMARY FOR SATURDAY, SEPTEMBER 23, 2023

TEMPERATURE (DEGREES F)
MAX…….58   NORMAL…..70
MIN…….54   NORMAL…..53
MEAN……56   NORMAL…..62

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-6
TOTAL DEPARTURE FOR THE MONTH…………………+73 [+3.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….9  DEPARTURE……..+4
TOTAL HEATING UNITS FOR THE MONTH……………34  DEPARTURE…….-23
TOTAL HEATING UNITS FOR THE SEASON…………..35  DEPARTURE…….-40
TOTAL HEATING UNITS LAST SEASON TO DATE………55  DEPARTURE…….-20

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…….+51
TOTAL COOLING UNITS FOR THE SEASON………….689  DEPARTURE…….+26
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)……….E26 NE   @  05:58 P.M.
VECTOR #1 (1-Sec)……….30 E    @  05:58 P.M.
VECTOR #2 (1-Sec)……….30 E    @  06:11 P.M.
DAVIS #1……………….29 E    @  05:58 P.M.
DAVIS #2 ………………28 N    @  06:11 P.M.
RMY #1 (Instantaneous)…..29 E    @  06:11 P.M.
RMY #2 (Instantaneous)…..33 NE   @  06:57 P.M.
MERLIN…………………27 NE
RICHARDS (C5C) (Inst)……27      @  05:58 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 NE   @  05:58 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18      @  06:08 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19      @  06:58 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 ENE  @  06:08 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 ENE  @  06:58 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 ENE  @  06:08 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 ENE  @  06:58 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18      @  06:08 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..12.2 NE [292 total miles] VECTOR #1………………11.3
VECTOR #2………………12.5
DAVIS #1……………….12.7 E
DAVIS #2……………….12.6 E
RMY #1…………………11.6 ENE
RMY #2…………………12.2 ENE
RICHARDS (C5C)………….12.1

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.28 DEPARTURE…..+0.15
TOTAL PRECIPITATION FOR THE MONTH…………..5.35 DEPARTURE…..+2.34
TOTAL PRECIPITATION FOR THE YEAR…………..45.80 DEPARTURE…..+8.18

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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/…/..              35 WNW VEC1 37 WNW RMY 36
9/20  72/53/63/0/0.00/…/..              21 WNW VEC1 21 WNW RMY 22
9/21  71/52/62/0/0.00/…/..              17 NNW VEC1 17 NNW RMY 17
9/22  68/54/61/-1/0.00/…/..             23 E   VEC1 21 E   RMY 22
9/23  58/54/56/-6/…./000/00             30 NE  VEC1 30 NE  RMY 27

9/24 The low since midnight is 56, the daily normal low is 53F

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

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

TODAY’S REPORT PREPARED BY: Kaitlin Ann Geagan