Friday, September 13, 2024

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

FRIDAY, SEPTEMBER 13, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0523E
SUNSET:  1756E

UNSEASONABLY WARM WEATHER CONTINUES WITH PLENTY OF SUNSHINE
TO START OFF THE WEEKEND…

A high pressure system is keeping us warm and dry, which has
been the pattern for the past several days. Mostly clear skies
were seen through much of the day with a few cumulus clouds that
appeared during the late morning and early afternoon.

Temperatures continued to climb into the low 80s by noon today and
so far the high temperature is 83F, which is much warmer than our
expected temperatures for this time of year. Our record high for
today is 91F, set in 1957. Along with the rising temperatures has
come with an increase of the dew point, making for a more sticky
feel to the air. The lower wind speeds have only emphasized the
sticky feel.

Winds were light today, mostly out of the west-southwest, and then
by the early afternoon became variable with periods of calm wind.
The average speed for the day so far is around 8mph, with most
wind occurring in the overnight and early morning hours. The peak
gust so far for the day is around 18mph, which occurred around
1:30am.

Visibility was around 40 miles for most of the day, mostly
due to the wildfire smoke layer that has been in our area for much
of the week and with the addition of the rising dew points.

The maximum temperature so far today is 83F, which is 9 degrees
above the normal high of 74F. The minimum temperature since midnight
is 59F, which is 2 degrees above the normal low of 57F.

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Today’s Observations:

7 A.M.
Weather: Scattered altocumulus NE-E-SSW
Temperature: 61F; Dew Point: 58F; Relative Humidity: 89%
Wind: WSW @ 6 kts, wind light
Sea-level pressure: 1024.7 mb; 30.26 in. Hg: rising, then steady
Visibility: 40 miles
6-hr Max temp: 61F
6-hr Min temp: 59F
24-hr Precip:  0.00 inches
BHO SA 1155 250 SCT 40 247/61/58/2406/026/ SCT AC NE-E-SSW WND LGT/
8/050 51002 10061 20059

10 A.M.
Weather: Clear, few cumulus distant SSE-S, smoke layer aloft all
quadrants
Temperature: 74F; Dew Point: 60F; Relative Humidity: 62%
Wind: WSW @ 4 kts, wind light and variable
Sea-level pressure: 1024.7 mb; 30.26 in. Hg: rising, then falling
Visibility: 40 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 40 247/74/60/2304/026/ FEW CU DSNT SSE-S K LYR ALF
ALQDS WND L/V/ 8/200 50000

1 P.M.
Weather: Clear, few cumulus all quadrants, smoke layer aloft all
quadrants
Temperature: 83F; Dew Point: 61F; Relative Humidity: 48%
Wind: W @ 2 kts, wind light and variable
Sea-level pressure: 1023.1 mb; 30.21 in. Hg: falling, then more
rapidly
Visibility: 40 miles
6-hr Max temp: 83F
6-hr Min temp: 61F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 40 231/83/61/2502/021/ FEW CU ALQDS K LYR ALF ALQDS
WND L/V/ 8/200 58016 10083 20061

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SUMMARY FOR THURSDAY, SEPTEMBER 12, 2024

TEMPERATURE (DEGREES F)
MAX…….82  NORMAL…..74
MIN…….58  NORMAL…..57
MEAN……70  NORMAL…..66

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+4
TOTAL DEPARTURE FOR THE MONTH……………………..-9 [-0.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE MONTH……………10  DEPARTURE……..-8
TOTAL HEATING UNITS FOR THE SEASON…………..21  DEPARTURE…….-15
TOTAL HEATING UNITS LAST SEASON TO DATE……….3  DEPARTURE…….+18

COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY…………….5  DEPARTURE……..+2
TOTAL COOLING UNITS FOR THE MONTH……………30  DEPARTURE…….-16
TOTAL COOLING UNITS FOR THE SEASON………….724  DEPARTURE…….+82
TOTAL COOLING UNITS LAST SEASON TO DATE……..683  DEPARTURE…….+41

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)……….E20 S    @   02:15 P.M.
VECTOR #1 (1-Sec)……….20 S    @   02:15 P.M.
VECTOR #2 (1-Sec)……….23 S    @   02:15 P.M.
DAVIS #1……………….22 S    @   05:02 P.M.
DAVIS #2 ………………31 S    @   02:15 P.M.
RMY #1 (Instantaneous)…..20 SSW  @   05:02 P.M.
RMY #2 (Instantaneous)…..24 S    @   02:15 P.M.
MERLIN…………………18 S
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 SSW  @   05:25 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14      @   05:25 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15      @   05:24 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………13 SSW  @   05:24 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 S    @   03:59 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 SSW  @   05:24 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 SSW  @   05:24 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..8.3 SSW [199 total miles] VECTOR #1………………8.7
VECTOR #2………………9.0
DAVIS #1……………….8.4 SW
DAVIS #2……………….8.9 SW
RMY #1…………………8.6 SW
RMY #2…………………9.1 SW
RICHARDS (C5C)………….OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..0.04 DEPARTURE…..-1.40
TOTAL PRECIPITATION FOR THE YEAR (2024)…….41.25 DEPARTURE…..+5.20

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PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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

9/1   82/67/75/+6/T/244/31                28 SSW VEC1 27 SW  RMY 28
9/2   79/56/68/-1/0.00/644/82             31 NNW VEC1 31 NNW RMY 32
9/3   74/49/62/-6/0.00/766/98             23 NW  VEC1 23 NNW RMY 23
9/4   80/56/68/0/0.00/732/94              18 ESE VEC1 19 SE  RMY 18
9/5   77/58/68/0/0.00/737/95              20 ESE VEC1 19 ESE RMY 19
9/6   73/58/66/-2/0.00/240/31             22 E   VEC1 21 ENE RMY 23
9/7   77/56/67/0/0.04/301/39              34 WNW VEC1 31 WNW RMY 33
9/8   70/50/60/-7/0.00/753/98             35 W   VEC1 35 W   RMY 34
9/9   75/51/63/-4/0.00/727/95             31 WNW VEC1 28 WNW RMY 30
9/10  78/56/67/+1/0.00/717/94             21 NW  VEC1 20 SW  RMY 21
9/11  78/53/66/0/0.00/714/94              20 S   VEC1 19 S   RMY 18
9/12  82/58/70/+4/0.00/…/..             20 S   VEC1 19 S   RMY 20

9/13  The low since midnight is 59F, the daily normal low is 57F.

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SEPTEMBER 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 SEPTEMBER 13
HIGH 91F IN 1957
LOW 40F IN 1985
PRECIP 3.10 INCHES IN 1987
PEAK GUST 44 MPH WNW IN 1986

RECORDS FOR SEPTEMBER 14
HIGH 90F IN 1931
LOW 34F IN 1911
PRECIP 2.90 INCHES IN 1944 (Great Atlantic Hurricane in 1944)
PEAK GUST 96e MPH E IN 1944 (Great Atlantic Hurricane in 1944)

TODAY’S REPORT PREPARED BY: Amanda Joly