Tuesday, August 13, 2024

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

TUESDAY, AUGUST 13, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0450E
SUNSET:  1847E

ALMOST A CARBON COPY OF YESTERDAY, A CLEAR START THEN BUILDING
CONVECTIVE CLOUDS BY EARLY THIS AFTERNOON….

The great weather continues with refreshingly low humidity levels
and very comfortable temperatures. Skies were clear to start
the day, but cumulus clouds have developed with diurnal heating
doing its thing. Some cirrus clouds have been observed also well
off to the south. One thing that is different today is a thin
smoke layer aloft that has overspread the area, likely from wild
fires out near the West Coast.

Temperatures started the day in the upper 50s, but have warmed
nicely into the upper 70s early this afternoon. The dew point has
been holding in the upper 50s all day making for another very
pleasant day to be outdoors.

The wind was gusty early this morning, but diminished during the
course of the morning, becoming light at times. It has been
trying to pick up a bit early this afternoon, but mainly in the
form of occasional gusts of 15-20mph. The average speed for the
day so far is around 10mph. The peak gust so far for the day is
22mph, which occurred just after 2am this morning.

Visibility has been great, with a view of 60-70 miles all day!

The maximum temperature so far today is 78F, which is 3 degrees
below the normal high of 81F. The minimum temperature since
midnight is 58F, which is 5 degrees below the normal low of 63F.

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Today’s Observations:

7 A.M.
Weather: Clear, thin smoke layer aloft distant WNW-N-ESE
Temperature: 63F; Dew Point: 59F; Relative Humidity: 86%
Wind: NNW @ 10G17 kts
Sea-level pressure: 1015.6 mb ; 29.99 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 63F
6-hr Min temp: 58F
24-hr Precip:  0.15 inches
BHO SA 1155 CLR 70 156/63/59/3310G17/999/ THN K LYR ALF DSNT WNW-N-ESE/
8/000 51009 70015 10063 20058

10 A.M.
Weather: Clear, few cumulus all quadrants, few cirrus distant SSE-SW,
thin smoke layer aloft all quadrants
Temperature: 72F; Dew Point: 59F; Relative Humidity: 63%
Wind: NW @ 6 kts, wind light
Sea-level pressure: 1016.2 mb; 30.01 in. Hg: rising, then more slowly
Visibility: 70 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 70 162/72/59/3006/001/ FEW CU ALQDS FEW CI DSNT SSE-SW
THN K LYR ALF ALQDS WND LGT/ 8/201 51006

1 P.M.
Weather: Clear, few cumulus all quadrants, thin smoke layer aloft all
quadrants
Temperature: 78F; Dew Point: 58F; Relative Humidity: 51%
Wind: WNW @ 5 kts, wind light
Sea-level pressure: 1015.1 mb; 29.98 in. Hg: falling unsteadily
Visibility: 60 miles
6-hr Max temp: 78F
6-hr Min temp: 63F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 60 151/78/58/3005/998/ FEW CU ALQDS THN K LYR ALF
ALQDS/ 8/200 57011 10078 20063

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SUMMARY FOR MONDAY, AUGUST 12, 2024

TEMPERATURE (DEGREES F)
MAX…….77  NORMAL…..81
MIN…….59  NORMAL…..63
MEAN……68  NORMAL…..72

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..-4
TOTAL DEPARTURE FOR THE MONTH…………………….+19 [+1.4 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………0
TOTAL HEATING UNITS FOR THE SEASON……………2  DEPARTURE……..-8
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…………..112  DEPARTURE…….+20
TOTAL COOLING UNITS FOR THE SEASON………….609  DEPARTURE……+130
TOTAL COOLING UNITS LAST SEASON TO DATE……..496  DEPARTURE……+113

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)……….E35 WNW  @   05:01 P.M.
VECTOR #1 (1-Sec)……….34 WNW  @   05:02 P.M.
VECTOR #2 (1-Sec)……….38 WNW  @   05:02 P.M.
DAVIS #1……………….33 W    @   05:00 P.M.
DAVIS #2 ………………35 NNW  @   05:02 P.M.
RMY #1 (Instantaneous)…..36 WNW  @   05:01 P.M.
RMY #2 (Instantaneous)…..39 WNW  @   05:02 P.M.
MERLIN…………………32 NW
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………25 WNW  @   05:02 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..23      @   05:03 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..27      @   05:02 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………23 W    @   05:03 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 NW   @   05:02 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..22 W    @   05:03 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..25 NW   @   05:01 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……10.2 W [245 total miles] VECTOR #1…………….10.4
VECTOR #2…………….10.8
DAVIS #1……………..10.8 W
DAVIS #2……………..10.7 WNW
RMY #1………………..9.9 W
RMY #2……………….10.6 W
RICHARDS (C5C)…………OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.15 DEPARTURE…..+0.02
TOTAL PRECIPITATION FOR THE MONTH…………..2.04 DEPARTURE…..+0.46
TOTAL PRECIPITATION FOR THE YEAR (2024)…….40.29 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/…/..              50 SSW VEC1 48 S   RMY 50
8/10  85/68/77/+5/0.37/…/..             41 SSW VEC1 41 SSW RMY 43
8/11  81/63/72/0/0.00/…/..              30 W   VEC1 29 SW  RMY 30
8/12  77/59/68/-4/0.15/…/..             35 WNW VEC1 34 WNW RMY 36

8/13  The low since midnight is 58F, 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

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

RECORDS FOR AUGUST 13
HIGH 98F IN 1944, 2002
LOW 47F IN 1902, 1957
PRECIP 2.92 INCHES IN 1989
PEAK GUST 52 MPH SSE IN 1963

RECORDS FOR AUGUST 14
HIGH 99F IN 2002
LOW 46F IN 1964
PRECIP 3.06 INCHES IN 1919
PEAK GUST 61 MPH WNW IN 1963

TODAY’S REPORT PREPARED BY: Matt Douglas