Thursday, July 27, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, JULY 27, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0432E
SUNSET: 1909E
HAZY, HOT, AND HUMID WITH GUSTY CONDITIONS TODAY AT
GREAT BLUE HILL…
This morning started off very gusty with fog and overcast skies.
As the day progressed, the fog burned off, and the temperatures
as well as the dew points increased steadily and rather rapidly.
Although we have had steep increases in those areas, the barometric
pressure has continued to drop. As of the 1pm EST observation,
the pressure has dropped over 4 millibars since 7am EST! That is
a significant amount and means that we have some instability
coming our way this evening.
The dew point reached up to 76F this afternoon which is very
uncomfortable for what we are used to in this region. With the
high dew points and seasonally warm temperatures, we have recorded
a heat index in the mid to upper 90’s. The heat advisory will be
here for a couple more days so make sure to limit strenuous outside
activity and stay hydrated.
The wind has been very intense today with an average speed of
about 16 mph. We have experienced some very gusty conditions this
afternoon with a recorded peak gust so far at 45 mph! Our record
peak gust for the day was in 1984 at 47 mph so maybe we will see
that surpassed by the end of the day.
From the earlier mentioned fog and high dew points, we have had
very hazy conditions on the hill today with limited visibility.
The visibility for most of the day has been 10-20 miles.
The maximum temperature so far today is 86F, this is 4 degrees
above the normal high of 82F. The minimum temperature today is
68F, which is 4 degrees above the normal low of 64F.
————————————————————–
Today’s Observations:
7 A.M.
Weather: Overcast stratus
Temperature: 71F; Dew Point: 70F; Relative Humidity: 93%
Wind: SW @ 11 kts, Gust 18 kts
Sea-level pressure: 1017.2 mb; 30.04 in. Hg: rising steadily
Visibility: 10 miles, thin fog all quadrants
6-hr Max temp: 71F
6-hr Min temp: 68F
24-hr Precip: 0.00 inches
BHO SA 1155 E15 OVC 10 172/71/70/2211G18/004/ THN F ALQDS/ 8/6// 52002 10071 20068
10 A.M.
Weather: Few breaks in overcast all quadrants, few cumulus all quadrants
Temperature: 80F; Dew Point: 73F; Relative Humidity: 80%
Wind: SW @ 13 kts, Gust 35 kts
Sea-level pressure: 1015.7 mb; 29.99 in. Hg: falling, then more rapidly
Visibility: 20 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E150 OVC 20 157/80/73/2113G35/999/ FEW BINOVC ALQDS FEW CU ALQDS HAZY PK WND 2035/47/ 8/25/ 58015
1 P.M.
Weather: Scattered cumulus all quadrants
Temperature: 84F; Dew Point: 65F; Relative Humidity: 75%
Wind: SW @ 9 kts
Sea-level pressure: 1012.6mb; 29.90 in. Hg: falling, then more rapidly
Visibility: 15 miles, hazy
6-hr Max temp: 86F
6-hr Min temp: 71F
6-hr Precip: 0.00 inches
BHO SA 1755 150 SCT 15 126/85/76/2016G24/990/ FEW CU ALQDS HAZY PK WND 2130/31/ HEAT INDEX 95/ 8/250 58031 10086 20071
————————————————————–
SUMMARY FOR WEDNESDAY, JULY 26, 2023
TEMPERATURE (DEGREES F)
MAX…….85 NORMAL…..82
MIN…….63 NORMAL…..64
MEAN……74 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+1
TOTAL DEPARTURE FOR THE MONTH…………………+54 [+1.9 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……..-6
TOTAL HEATING UNITS FOR THE SEASON……………0 DEPARTURE……..-6
TOTAL HEATING UNITS LAST SEASON TO DATE……….0 DEPARTURE………0
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….9 DEPARTURE……..+1
TOTAL COOLING UNITS FOR THE MONTH…………..252 DEPARTURE…….+46
TOTAL COOLING UNITS FOR THE SEASON………….380 DEPARTURE…….+35
TOTAL COOLING UNITS LAST SEASON TO DATE……..445 DEPARTURE…….-65
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)……….E23 W @ 01:23 A.M.
VECTOR #1 (1-Sec)……….23 SW @ 07:22 P.M.
VECTOR #2 (1-Sec)……….23 WSW @ 04:26 P.M.
DAVIS #1……………….23 SW @ 07:20 P.M.
DAVIS #2 ………………22 SW @ 04:25 P.M.
RMY #1 (Instantaneous)…..23 WSW @ 04:26 P.M.
RMY #2 (Instantaneous)…..23 SW @ 07:16 P.M.
MERLIN…………………23 SSW
RICHARDS (C5C) (Inst)……22 @ 04:23 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………17 W @ 01:27 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16 @ 01:45 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 @ 01:27 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 W @ 01:45 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 SW @ 07:34 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 SW @ 07:34 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..17 SW @ 07:34 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………16 @ 01:45 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………..10.0 WSW [241 total miles]
VECTOR #1…………………10.2
VECTOR #2…………………10.5
DAVIS #1………………….10.2 WSW
DAVIS #2………………….10.4 WSW
RMY #1……………………10.0 WSW
RMY #2……………………10.5 WSW
RICHARDS (C5C)…………….10.1
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..8.11 DEPARTURE…..+5.23
TOTAL PRECIPITATION FOR THE YEAR…………..33.29 DEPARTURE…..+3.18
————————————————————–
PRELIMINARY CLIMATE SUMMARY FOR JULY 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
7/1 80/61/71/0/0.00/567/62 17 SSE VEC1 16 SSE RMY 17
7/2 74/63/69/-2/0.34/027/03 35 S VEC1 35 S RMY 35
7/3 79/63/72/-1/0.40/265/29 18 NNW VEC1 18 NNW RMY 17 TSTM
7/4 71/65/68/-4/0.81/000/00 17 NE VEC1 18 NE RMY 17 TSTM
7/5 88/66/77/+5/0.00/720/79 17 S VEC1 16 SE RMY 15
7/6 92/69/81/+9/0.00/683/75 23 SSW VEC1 22 SSW RMY 23
7/7 87/70/78/+6/0.00/763/84 23 SW VEC1 22 SW RMY 23
7/8 84/70/77/+5/0.00/463/51 20 W VEC1 20 W RMY 19
7/9 81/69/75/+2/T/200/22 17 ESE VEC1 18 E RMY 17
7/10 71/66/69/-4/0.68/000/00 22 ESE VEC1 21 ESE RMY 22
7/11 85/62/74/+1/0.00/796/88 24 WNW VEC1 25 WNW RMY 25
7/12 91/70/81/+8/0.00/713/79 21 WSW VEC1 22 SSW RMY 20
7/13 88/67/78/+5/0.13/695/77 35 SSW VEC1 35 SSW RMY 38 TSTM
7/14 78/65/72/-1/0.18/342/38 29 SSW VEC1 32 SSW RMY 32 TSTM
7/15 86/70/78/+5/T/548/61 28 SSW VEC1 30 SSW RMY 29 TSTM
7/16 76/71/74/+1/2.56/000/00 40 S VEC1 41 SSW RMY 48 TSTM
7/17 86/71/79/+6/0.00/699/78 21 WSW VEC1 21 W RMY 23
7/18 84/70/77/+4/0.00/402/45 28 SSW VEC1 28 SSW RMY 27
7/19 83/68/76/+3/0.00/…/.. 23 W VEC1 23 W RMY 22
7/20 82/64/73/+0/0.00/…/.. 17 NNE VEC1 17 SE RMY 18
7/21 79/62/71/-2/1.99/…/.. 30 NW VEC1 31 NW RMY 32 TSTM
7/22 81/64/73/0/0.00/…/.. 15 W VEC1 14 W RMY 16
7/23 85/65/75/+2/0.00/…/.. 21 NW VEC1 20 W RMY 21
7/24 85/67/76/+3/0.00/…/.. 23 S VEC1 24 S RMY 24
7/25 85/64/75/+2/1.02/…/.. 29 NNE VEC1 30 NNW RMY 29 TSTM
7/26 85/63/74/+1/0.00/…/.. 23 W VEC1 23 W RMY 23
7/26 The low since midnight is 68F, the daily normal low is 64F
DAILY RECORDS
07/16/2023: NEW RECORD DAILY PRECIPITATION OF 2.56 INCHES;
SURPASSES THE PREVIOUS RECORD OF 0.98 INCHES IN 2014
07/16/2023: RECORD HIGH DAILY MINIMUM TEMPERATURE OF 71F;
TIES THE RECORD OF 71F SET IN 1901, 1958, 1968, AND 2013
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JULY 27
HIGH 95F IN 1949, 1963
LOW 50F IN 1920, 2001
PRECIP 4.01 INS IN 1979
WIND 47 MPH ENE IN 1984
RECORDS FOR JULY 28
HIGH 97F IN 1931
LOW 49F IN 1903
PRECIP 3.32 INS IN 1911
PEAK GUST 62 MPH SW IN 2006
TODAY’S REPORT PREPARED BY: Amanda Joly
