Monday, July 29, 2024

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

MONDAY, JULY 29, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0434E
SUNSET:  1906E

OVERCAST AND COOL WITH SCATTERED SHOWERS….

An upper level low that was well to the southeast of New England
yesterday backed into the region overnight and is right over
Southern New England today. As a result, clouds have dominated the
sky with scattered showers around since last evening. 0.12″ of
rain was measured at 7am this morning with an additional 0.04″
falling since that time. So even though it’s been a gloomy day,
the showers have for the most part been on the light side.

Temperatures are of course being held down by a combination of
the cloud cover and colder air aloft associated with the upper
low. Readings have been holding in the 60s all day, a solid 15
degrees below normal, at least through early this afternoon.

The wind has been light for the most part today, only averaging
around 7mph. The peak gust so far is only 16mph which occurred
just after midnight.

Visibility has been limited as one would expect with the scattered
showers and thin fog around. The view was under 1/2 for a time
this morning while we were in the cloud, but has improved to only
around 10-15 miles early this afternoon.

The maximum temperature so far today is 67F, which is 15 degrees
below the normal high of 82F. The minimum temperature since midnight
is 61F, which is 1 degree below the normal low of 62F.

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Today’s Observations:

7 A.M.
Weather: Overcast stratocumulus, light rain showers
Temperature: 62F; Dew Point: 62F; Relative Humidity: 98%
Wind: SW @ 4 kts, wind light
Sea-level pressure: 1016.8 mb; 30.03 in. Hg: steadym then rising
Visibility: 1 mile, fog
6-hr Max temp: 62F
6-hr Min temp: 61F
24-hr Precip:  0.12 inches
BHO SA 1155 E22 OVC 1RW-F 168/62/62/2304/003/ RW-B25 WND LGT/
8/5// 53009 6001/ 70012 10062 20061

10 A.M.
Weather: Broken stratocumulus, overcast altostratus, few breaks in
overcast OVHD-N-NNE
Temperature: 65F; Dew Point: 64F; Relative Humidity: 97%
Wind: W @ 4 kts, wind light
Sea-level pressure: 1016.6 mb; 30.02 in. Hg: falling, then rising
Visibility: 10 miles, thin fog
3-hr Precip: 0.04 inches
BHO SA 1455 E18 BKN 40 OVC 10 166/65/64/2604/002/ FEW BINOVC OVHD-N-NNE
THN F ALQDS RW-E36 WND LGT/ 8/52/ 55002 6004/

1 P.M.
Weather: Scattered cumulus, overcast altostratus, few breaks in
overcast SW-NW
Temperature: 66F; Dew Point: 62F; Relative Humidity: 87%
Wind: SW @ 3 kts, wind light and variable
Sea-level pressure: 1016.3 mb; 30.01 in. Hg: falling, then steady
Visibility: 15 miles, thin fog
6-hr Max temp: 67F
6-hr Min temp: 62F
6-hr Precip: 0.04 inches
BHO SA 1755 13 SCT 30 OVC 15 163/66/62/2203/001/ FEW BINOVC SW-NW
THN F ALQDS WND L/V/ 8/22/ 56003 6004/ 10067 20062

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SUMMARY FOR SUNDAY, JULY 28, 2024

TEMPERATURE (DEGREES F)
MAX…….82  NORMAL…..82
MIN…….62  NORMAL…..64
MEAN……72  NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..-1
TOTAL DEPARTURE FOR THE MONTH…………………….+79 [+2.6 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……..-7
TOTAL HEATING UNITS FOR THE SEASON……………0  DEPARTURE……..-7
TOTAL HEATING UNITS LAST SEASON TO DATE……….0  DEPARTURE………0

COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY…………….7  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH…………..293  DEPARTURE…….+70
TOTAL COOLING UNITS FOR THE SEASON………….471  DEPARTURE……+109
TOTAL COOLING UNITS LAST SEASON TO DATE……..406  DEPARTURE…….+65

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 ESE  @   01:36 P.M.
VECTOR #1 (1-Sec)……….18 SE   @   01:30 P.M.
VECTOR #2 (1-Sec)……….17 SE   @   01:31 P.M.
DAVIS #1……………….16 E    @   01:32 P.M.
DAVIS #2 ………………16 ESE  @   01:31 P.M.
RMY #1 (Instantaneous)…..18 ESE  @   01:35 P.M.
RMY #2 (Instantaneous)…..18 ESE  @   01:34 P.M.
MERLIN…………………17 SE
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………11 SE   @   07:38 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..12      @   01:36 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..13      @   01:35 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………13 ESE  @   01:36 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………13 ESE  @   01:35 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..12 ESE  @   01:36 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..13 ESE  @   01:32 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….5.9 ESE [142 total miles] VECTOR #1……………..6.4
VECTOR #2……………..6.7
DAVIS #1………………6.3 ESE
DAVIS #2………………6.3 ESE
RMY #1………………..6.4 E
RMY #2………………..6.7 E
RICHARDS (C5C)…………OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.12 DEPARTURE…..+0.01
TOTAL PRECIPITATION FOR THE MONTH…………..2.47 DEPARTURE…..-0.64
TOTAL PRECIPITATION FOR THE YEAR (2024)…….38.15 DEPARTURE…..+7.81

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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/+4/0.05/478/53             32 SW  VEC1 32 SW  RMY 32
7/13  80/72/76/+3/0.64/234/26             28 SW  VEC1 25 SW  RMY 26
7/14  88/69/79/+6/0.00/809/90             18 SW  VEC1 18 SW  RMY 19
7/15  92/70/81/+8/0.07/539/60             28 WSW VEC1 27 WSW RMY 28 TSTM
7/16  92/72/82/+9/T/797/89                33 SW  VEC1 34 SW  RMY 34
7/17  89/71/80/+7/0.37/599/67             38 W   VEC1 36 W   RMY 37 TSTM
7/18  85/68/77/+4/0.55/429/48             37 W   VEC1 37 W   RMY 38 TSTM
7/19  82/61/72/-1/0.00/864/97             24 N   VEC1 24 NNW RMY 23
7/20  85/63/74/+1/T/747/84                30 WSW VEC1 31 WSW RMY 32
7/21  86/68/77/+4/T/630/71                18 WSW VEC1 18 WSW RMY 18
7/22  83/66/75/+2/T/452/51                24 SSW VEC1 23 SSW RMY 23
7/23  75/65/70/-3/0.02/027/03             17 ESE VEC1 17 SSE RMY 17
7/24  70/64/67/-6/0.09/009/01             16 ESE VEC1 16 ESE RMY 15
7/25  80/64/72/-1/0.12/…/..             28 WNW VEC1 28 WNW RMY 29 TSTM
7/26  83/59/71/-2/0.00/…/..             25 N   VEC1 25 N   RMY 26
7/27  84/63/74/+1/0.00/…/..             17 SE  VEC1 17 SE  RMY 16
7/28  82/62/72/-1/0.04/../..              18 ESE VEC1 18 SE  RMY 18

7/29  The low since midnight is 61F, 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 29
HIGH 97F IN 1949
LOW 53F IN 1888,1914
PRECIP 1.53 INS IN 1901
PEAK GUST 40e MPH E IN 1941

RECORDS FOR JULY 30
HIGH 99F IN 1949
LOW 51F IN 1956
PRECIP 1.84 INS IN 1976
PEAK GUST 70e MPH SW 1944

TODAY’S REPORT PREPARED BY: Matt Douglas