Monday, July 15, 2024

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

MONDAY, JULY 15, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0421E
SUNSET:  1919E

ANOTHER EXCEPTIONALLY WARM DAY ON GREAT BLUE HILL TODAY….

Today started off warm with plenty of hazy skies and dew points
in the 70’s. Fortunately, the morning brought some cloudy
conditions which kept the temperature from climbing too high.
As of the final observation we are at 90F which is only 4F from
the record high set in 1995.

Dew point values have risen from an already uncomfortable 70F to
a staggering 76F which is downright oppressive for many. The heat
index was at 102F at the 1pm observation so it is very dangerous
for rigorous activity and for the vulnerable population. We hope
that everyone is taking precautions to stay cool and well hydrated!

Winds were abysmally low yesterday, with an average of only 6-7 mph
and fortunately today there has been a slight increase to about
10 mph. Winds have mostly been out of the SW and WSW today,
bringing even more warm air to the area. The peak gust so far
for today occurred just after 11am at around 27 mph.

The maximum temperature so far today is 90F, which is 7 degrees
above the normal high of 82F. The minimum temperature since
midnight is 70F, which is 6 degrees above the normal low of 64F.

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Today’s Observations:

7 A.M.
Weather: Broken altocumulus, broken cirrostratus
Temperature: 74F; Dew Point: 70F; Relative Humidity: 87%
Wind: SW @ 7 kts
Sea-level pressure: 1013.0 mb; 29.91 in. Hg: falling, then
rising
Visibility: 12 miles, hazy
6-hr Max temp: 74F
6-hr Min temp: 70F
24-hr Precip:  0.00 inches
BHO SA 1155 85 BKN 250 BKN 12 130/74/70/2207/991/ HAZY/ 8/056
55000 10074 20070

10 A.M.
Weather: Scattered altocumulus
Temperature: 85F; Dew Point: 75F; Relative Humidity: 75%
Wind: SW @ 9 kts
Sea-level pressure: 1012.0 mb; 29.88 in. Hg: falling, then
more rapidly
Visibility: 20 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 85 SCT 20 120/85/75/2209/988/ HAZY HX 95/ 8/030
58010

1 P.M.
Weather: Scattered altocumulus, scattered cirrus, few cumulus
all quadrants
Temperature: 90F; Dew Point: 76F; Relative Humidity: 65%
Wind: WSW @ 12 kts
Sea-level pressure: 1010.8 mb; 29.85 in. Hg: falling, then
more rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 86F
6-hr Min temp: 74F
6-hr Precip: 0.00 inches
BHO SA 1755 85 SCT 250 SCT 30 108/90/76/2512/985/ FEW CU ALQDS
HAZY HX 102/ 8/236 58012 10090 20074

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SUMMARY FOR SUNDAY, JULY 14, 2024

TEMPERATURE (DEGREES F)
MAX…….88  NORMAL…..82
MIN…….69  NORMAL…..64
MEAN……79  NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+6
TOTAL DEPARTURE FOR THE MONTH…………………….+57 [+3.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………….0  DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE SEASON……………0  DEPARTURE……..-4
TOTAL HEATING UNITS LAST SEASON TO DATE……….0  DEPARTURE………0

COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY……………14  DEPARTURE……..+6
TOTAL COOLING UNITS FOR THE MONTH…………..159  DEPARTURE…….+54
TOTAL COOLING UNITS FOR THE SEASON………….337  DEPARTURE…….+93
TOTAL COOLING UNITS LAST SEASON TO DATE……..259  DEPARTURE…….+78

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)……….E18 SW   @   09:03 P.M.
VECTOR #1 (1-Sec)……….18 SW   @   09:06 P.M.
VECTOR #2 (1-Sec)……….19 SW   @   09:03 P.M.
DAVIS #1……………….18 SSW  @   09:04 P.M.
DAVIS #2 ………………19 SW   @   09:05 P.M.
RMY #1 (Instantaneous)…..19 SW   @   09:06 P.M.
RMY #2 (Instantaneous)…..20 SW   @   09:03 P.M.
MERLIN…………………18 SW
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 SW   @   09:05 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14      @   09:05 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15      @   09:05 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 SW   @   09:05 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 SW   @   09:05 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 SW   @   09:05 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 SW   @   09:05 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….6.0 WSW [143 total miles] VECTOR #1……………..7.1
VECTOR #2……………..7.3
DAVIS #1………………6.7 WSW
DAVIS #2………………6.9 W
RMY #1………………..6.8 W
RMY #2………………..7.2 W
RICHARDS (C5C)…………OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..1.13 DEPARTURE…..-0.43
TOTAL PRECIPITATION FOR THE YEAR (2024)…….36.81 DEPARTURE…..+8.02

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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   77/63/70/-1/0.07/722/79             29 N   VEC1 27 N   RMY 28 TSTM
7/2   80/60/70/-1/0.00/886/97             20 N   VEC1 20 N   RMY 19
7/3   84/62/73/+1/0.00/856/94             25 S   VEC1 25 S   RMY 26
7/4   85/62/74/+2/0.04/392/43             28 SSW VEC1 28 SSW RMY 28
7/5   84/68/76/+4/0.22/146/16             29 SSW VEC1 29 SSW RMY 29
7/6   77/71/74/+2/0.10/009/01             31 SW  VEC1 33 SSW RMY 33
7/7   88/72/80/+8/0.00/345/38             15 SW  VEC1 15 SW  RMY 14
7/8   91/71/81/+9/0.00/780/86             17 NW  VEC1 18 NW  RMY 18
7/9   88/72/80/+7/T/534/59                26 SSW VEC1 27 SSW RMY 29
7/10  88/72/80/+7/0.00/552/61             38 SSW VEC1 37 SSW RMY 38
7/11  87/71/79/+6/0.01/470/52             41 SSW VEC1 40 SSW RMY 41
7/12  85/69/77/+4/0.05/…/..             32 SW  VEC1 32 SW  RMY 32
7/13  80/72/76/+3/0.64/…/..             28 SW  VEC1 25 SW  RMY 26
7/14  88/69/79/+6/0.00/…/..             18 SW  VEC1 18 SW  RMY 19

7/15  The low since midnight is 70F, the daily normal low is 64F.

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JULY 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 JULY 15
HIGH 94F IN 1995
LOW 50F IN 1929, 1930
PRECIP 1.64 INS IN 1896
WIND 71 MPH WNW IN 2002

RECORDS FOR JULY 16
HIGH 94F IN 1968, 1980, 1983, 1999
LOW 50F IN 1903
PRECIP 2.56 INS IN 2023
WIND 48e MPH SW 1944

TODAY’S REPORT PREPARED BY: Amanda Joly