Friday, August 25, 2023

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

FRIDAY, AUGUST 25, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0502E
SUNSET:  1830E

A SOGGY START TO THE WEEKEND WITH LOW VISIBILITY, COOL
TEMPERATURES, AND WINDY CONDITIONS ON THE HILL TODAY…

Today has been windy, rainy, and much cooler than normal. We
have received over an inch of rain in the last 24 hours which
has made for very soggy conditions on the hill. Rain was
heaviest this morning and tapered off to a light drizzle by
early afternoon. Fog has remained in the area all day as well,
adding to the feel of a damp, cool, raw kind of day.

The wind has been productive today with an average so far of
18 mph, which is impressive considering that was close to our
peak gusts earlier this week. The peak gust so far occurred
just after noon at around 36 mph.

We have experienced foggy conditions throughout the day as
earlier stated, with visibility less than a mile for most of the
morning. We had some clearing once the heaviest rain moved out
and “improved” to 8 miles of visibility at our final observation
this afternoon.

The maximum temperature so far today has been 67F, which is
12 degrees below the normal high of 79F. The minimum temperature
since midnight is 58F, which is 4 degrees below the normal low
of 62F.

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Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 200ft, rain
showers
Temperature: 62F; Dew Point: 62F; Relative Humidity: 100%
Wind: S @ 15G29 kts, peak wind S 33mph at 6:54am
Sea-level pressure: 1015.2 mb; 29.98 in. Hg: falling, then
more rapidly
Visibility: 1/2 mile, light fog
6-hr Max temp: 62F
6-hr Min temp: 58F
6-hr precip: 0.90 inches
24-hr Precip: 1.10 inches
BHO SA 1155 X W2 1/2RW-F 152/62/62/1715G29/998/ PK WND
1729/54/ 8//// 58009 6090/ 70110 10062 20058

10 A.M.
Weather: Sky obscured, vertical visibility 200ft, rain
showers
Temperature: 65F; Dew Point: 65F; Relative Humidity: 100%
Wind: S @ 20G29 kts, peak wind S 31mph at 9:47am
Sea-level pressure: 1013.9 mb; 29.94 in. Hg: falling
unsteadily
Visibility: 1/4 mile, fog
3-hr Precip: 0.31 inches
BHO SA 1455 X W2 1/4RWF 139/65/65/1820G29/994/ PK WND
1827/47/ 8//// 57013 6031

1 P.M.
Weather: Overcast stratus, light rain
Temperature: 66F; Dew Point: 66F; Relative Humidity: 100%
Wind: S @ 17G26 kts, peak wind S 35mph at 12:38pm
Sea-level pressure: 1013.5 mb; 29.93 in. Hg: falling, then
more rapidly
Visibility: 8 miles, fog
6-hr Max temp: 67F
6-hr Min temp: 62F
6-hr Precip: 0.33 inches
BHO SA 1755 OVC 8L-F 135/66/66/1817G26/993/ PCPN VRY LGT
PK WND 1830/38/ 8/6// 58004 6033 10067 20062

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SUMMARY FOR THURSDAY, AUGUST 24, 2023

TEMPERATURE (DEGREES F)
MAX…….78   NORMAL…..79
MIN…….58   NORMAL…..62
MEAN……68   NORMAL…..71

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-3
TOTAL DEPARTURE FOR THE MONTH…………………-46 [-2.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………….0  DEPARTURE……..-7
TOTAL HEATING UNITS FOR THE SEASON……………0  DEPARTURE…….-14
TOTAL HEATING UNITS LAST SEASON TO DATE……….0  DEPARTURE………0

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….3  DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE MONTH…………..122  DEPARTURE…….-50
TOTAL COOLING UNITS FOR THE SEASON………….544  DEPARTURE…….-14
TOTAL COOLING UNITS LAST SEASON TO DATE……..765  DEPARTURE……-221

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)……….E24 S    @  09:50 P.M.
VECTOR #1 (1-Sec)……….24 S    @  09:50 P.M.
VECTOR #2 (1-Sec)……….25 SSW  @  06:00 P.M.
DAVIS #1……………….23 S    @  09:50 P.M.
DAVIS #2 ………………29 S    @  09:50 P.M.
RMY #1 (Instantaneous)…..23 S    @  09:50 P.M.
RMY #2 (Instantaneous)…..25 SSE  @  11:28 P.M.
MERLIN…………………32 S
RICHARDS (C5C) (Inst)……22      @  11:24 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL……………….17 S   @  09:52 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE……………16     @  09:52 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE……………18     @  09:52 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…………….16 SSE @  11:28 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE…………….20 S   @  09:52 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE………………16 S   @  09:52 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE………………18 S   @  09:52 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……….16     @  09:52 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……….9.3 SSW  [224 total miles] VECTOR #1………………..9.7
VECTOR #2……………….10.2
DAVIS #1…………………9.2 SSW
DAVIS #2………………..10.2 SSW
RMY #1………………….11.5 S
RMY #2………………….10.3 SW
RICHARDS (C5C)……………9.6

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..1.10 DEPARTURE…..+0.98
TOTAL PRECIPITATION FOR THE MONTH…………..4.90 DEPARTURE…..+1.83
TOTAL PRECIPITATION FOR THE YEAR…………..39.67 DEPARTURE…..+5.90

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PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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

8/1   76/58/67/-6/0.00/763/88             24 NW  VEC1 24 NW  RMY 24
8/2   75/54/65/-8/0.00/830/96             23 SSW VEC1 22 SSW RMY 23
8/3   79/59/69/-4/0.00/725/84             32 SSW VEC1 34 SSW RMY 34
8/4   77/62/70/-3/T/172/20                29 SSW VEC1 29 SSW RMY 29
8/5   83/66/75/+2/0.00/523/61             18 NW  VEC1 16 WNW RMY 17
8/6   82/60/71/-2/0.00/839/98             20 W   VEC1 19 W   RMY 19
8/7   72/65/69/-4/0.14/034/04             29 SSE VEC1 30 SSE RMY 29
8/8   82/68/75/+3/0.47/187/22             39 S   VEC1 42 S   RMY 42
8/9   82/66/74/+2/0.00/756/89             39 WNW VEC1 38 WNW RMY 38
8/10  83/64/74/+2/0.02/254/30             28 SSW VEC1 27 SSW RMY 28
8/11  80/63/72/+0/0.07/810/96             36 W   VEC1 36 W   RMY 38
8/12  84/61/73/+1/0.00/733/87             26 SSW VEC1 26 SSW RMY 26
8/13  84/68/76/+4/0.07/629/75             26 SSW VEC1 26 SSW RMY 27 TSTM
8/14  82/63/73/+1/T/536/64                25 W   VEC1 24 W   RMY 29
8/15  70/64/67/-5/0.70/000/00             28 NE  VEC1 27 NE  RMY 28
8/16  68/64/66/-6/T/000/00                18 ESE VEC1 19 ENE RMY 18
8/17  70/62/66/-6/T/116/14                15 E   VEC1 14 E   RMY 14
8/18  79/61/70/-1/1.48/298/36             32 W   VEC1 34 W   RMY 33 TSTM
8/19  72/57/65/-6/0.00/371/45             29 W   VEC1 30 W   RMY 30
8/20  81/59/70/-1/0.00/764/93             23 W   VEC1 22 W   RMY 21
8/21  84/64/74/+3/0.85/…/..             29 NE  VEC1 30 ENE RMY 29
8/22  75/59/67/-4/0.00/…/..             29 NNE VEC1 29 NNE RMY 29
8/23  76/56/66/-5/0.00/…/..             20 NNE VEC1 20 NNE RMY 20
8/24  78/58/68/-3/0.02/…/..             24 S   VEC1 24 S   RMY 23

8/25 The low since midnight is 58F, the daily normal low is 62F

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

RECORDS FOR AUGUST 25
HIGH 93F IN 1947, 1948, 2007
LOW 41F IN 1940
PRECIP 2.69 INCHES IN 2010
PEAK GUST 60e MPH SSW IN 1941

RECORDS FOR AUGUST 26
HIGH 96F IN 1900, 1948
LOW 46F IN 1885
PRECIP 5.85 INCHES IN 1924
PEAK GUST 55e MPH NNW IN 1947

TODAY’S REPORT PREPARED BY: Amanda Joly