Sunday, August 18, 2024

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

SUNDAY, AUGUST 18, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0455E
SUNSET:  1840E

OVERCAST WITH AN OCCASIONAL RAIN SHOWER AND LIGHT WIND….

Today we observed foggy and overcast conditions with 5 miles of
visibility, maximum. Overnight rain amounted to 0.06 inches, and
an additional 0.03 fell since the 7 o’clock observation. Skies
were overcast with stratus clouds, and wind was from the east.
The average wind speed for the day was an unimpressive 5 mph!

The maximum temperature so far today is 68F, which is 12 degrees
below the normal high of 80F. The minimum temperature since
midnight is 62F, which is a degree below the normal low of 63F.

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Today’s Observations:

7 A.M.
Weather: Fog, vertical visibility 300ft
Temperature: 63F; Dew Point: 63F; Relative Humidity: 100%
Wind: ENE @ 7 kts
Sea-level pressure: 1015.8 mb ; 29.99 in. Hg: rising then falling
Visibility: 1/2 mile, fog
6-hr Max temp: 64F
6-hr Min temp: 62F
24-hr Precip:  0.06 inches
BHO SA 1155 X W3 1/2RWF 158/63/63/0707/999/ RWB30E55/ 8//// 55002
70006 10064 20062

10 A.M.
Weather: Overcast stratus, light rain shower
Temperature: 67F; Dew Point: 65F; Relative Humidity: 93%
Wind: ESE @ 3 kts, wind light
Sea-level pressure: 1016.0 mb; 30.00 in. Hg: rising then falling
Visibility: 5 miles, fog
3-hr Precip: 0.00 inches
BHO SA 1455 5 OVC 5RW-F 160/67/65/1103/000/ RW-B30E50 WND L/V/ 8/6//
50002 6002/

1 P.M.
Weather: Overcast stratus, light rain shower
Temperature: 68F; Dew Point: 66F; Relative Humidity: 93%
Wind: E @ 3 kts, wind light
Sea-level pressure: 1014.7 mb; 29.96 in. Hg: falling, then more rapidly
Visibility: 5 miles, fog
6-hr Max temp: 68F
6-hr Min temp: 63F
6-hr Precip: 0.03 inches
BHO SA 1755 5 OVC 5RW-F 147/68/66/0903/996/ RW-B30E50 WND L/V/ 8/6//
58013 6003/ 10068 20063

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SUMMARY FOR SATURDAY, AUGUST 17, 2024

TEMPERATURE (DEGREES F)
MAX…….75  NORMAL…..80
MIN…….60  NORMAL…..63
MEAN……68  NORMAL…..72

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..-4
TOTAL DEPARTURE FOR THE MONTH……………………..+9 [+0.3 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…………….2  DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE SEASON……………2  DEPARTURE……..-9
TOTAL HEATING UNITS LAST SEASON TO DATE……….0  DEPARTURE……..+2

COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY…………….3  DEPARTURE……..-4
TOTAL COOLING UNITS FOR THE MONTH…………..137  DEPARTURE…….+10
TOTAL COOLING UNITS FOR THE SEASON………….634  DEPARTURE……+120
TOTAL COOLING UNITS LAST SEASON TO DATE……..519  DEPARTURE……+115

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)……….E17 SE   @   07:13 P.M.
VECTOR #1 (1-Sec)……….16 SE   @   07:02 P.M.
VECTOR #2 (1-Sec)……….16 SSE  @   05:07 P.M.
DAVIS #1……………….14 SE   @   05:07 P.M.
DAVIS #2 ………………16 S    @   04:15 P.M.
RMY #1 (Instantaneous)…..15 SE   @   07:47 P.M.
RMY #2 (Instantaneous)…..17 ESE  @   05:08 P.M.
MERLIN…………………14 SE
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………10 SE   @   07:10 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..11      @   07:13 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..12      @   05:08 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………11 SSE  @   07:47 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………12 SE   @   05:08 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..10 SSE  @   07:47 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..13 SE   @   05:08 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….5.4 SSE [130 total miles] VECTOR #1……………..6.5
VECTOR #2……………..6.7
DAVIS #1………………6.0 SE
DAVIS #2………………6.1 SSE
RMY #1………………..6.1 SSE
RMY #2………………..6.8 SE
RICHARDS (C5C)…………OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.06 DEPARTURE…..-0.06
TOTAL PRECIPITATION FOR THE MONTH…………..2.67 DEPARTURE…..+0.46
TOTAL PRECIPITATION FOR THE YEAR (2024)…….40.92 DEPARTURE…..+8.01

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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   92/71/82/+9/T/779/90                24 W   VEC1 24 W   RMY 23
8/2   94/73/84/+11/0.01/579/67            31 SSW VEC1 31 SSW RMY 30 TSTM
8/3   92/75/84/+11/0.00/612/71            29 W   VEC1 28 W   RMY 28
8/4   85/68/77/+4/0.20/318/37             29 WSW VEC1 29 WSW RMY 31 TSTM
8/5   90/67/79/+6/T/686/80                28 SSW VEC1 28 SSW RMY 29
8/6   73/60/67/-6/0.56/009/01             26 ENE VEC1 26 ENE RMY 26
8/7   69/57/63/-10/0.18/119/14            25 NE  VEC1 23 NE  RMY 23
8/8   72/58/65/-7/0.09/187/22             20 ESE VEC1 20 ESE RMY 19
8/9   82/62/72/0/0.48/127/15              50 SSW VEC1 48 S   RMY 50
8/10  85/68/77/+5/0.37/659/78             41 SSW VEC1 41 SSW RMY 43
8/11  81/63/72/0/0.00/741/88              30 W   VEC1 29 SW  RMY 30
8/12  77/59/68/-4/0.15/638/76             35 WNW VEC1 34 WNW RMY 36
8/13  80/58/69/-3/0.00/787/94             21 NW  VEC1 22 NW  RMY 21
8/14  82/62/72/0/0.00/676/81              16 NNW VEC1 15 NNW RMY 15
8/15  84/62/73/+1/0.57/…/..             44 N   VEC1 42 N   RMY 46 TSTM
8/16  74/61/68/-4/0.00/…/..             13 ESE VEC1 13 ESE RMY 13
8/17  75/60/68/-4/…./…/..             17 SE  VEC1 16 SE  RMY 15

8/18  The low since midnight is 63F, the daily normal low is 63F.

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AUGUST DAILY RECORDS TO DATE

8/3  RECORD HIGH MINIMUM TEMPERATURE OF 75F,
TIED THE PREVIOUS RECORD SET IN 2020

8/15 PEAK GUST 44e MPH N,
TIED THE PREVIOUS RECORD SET IN 1941

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

RECORDS FOR AUGUST 18
HIGH 93F IN 2002
LOW 49F IN 1918, 1941
PRECIP 4.64 INCHES IN 1955 [DIANE] PEAK GUST 46 MPH WNW IN 2007

RECORDS FOR AUGUST 19
HIGH 92F IN 2019
LOW 48F IN 1958
PRECIP 8.07 INCHES IN 1955 [DIANE – RECORD FOR MONTH] PEAK GUST 78 MPH ENE IN 1991 – HURRICANE BOB

TODAY’S REPORT PREPARED BY: Benjamin Turner