Sunday, May 5, 2024

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

SUNDAY, MAY 5, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0434E
SUNSET:  1849E

CLOUDY AND CHILLY TODAY WITH BELOW NORMAL TEMPERATURES….

Skies have been overcast all day which is helping to keep
temperatures on the chilly side. Rain showers off to the west and
southwest have begun to move into the area as a few showers have
been observed in the last hour. More showers will arrive by later
this afternoon.

As mentioned, temperatures are below normal for the date with
readings generally holding in the upper 40s to near 50. This is
solidly around 14 degrees below the normal high for the date.

Wind have been on the lighter side again today, with an average
of around 7mph. The wind has gradually veered fro the east-
southeast to the south. The peak gust for the day so far is only
18mph, occurring around 5am.

Visibility has been limited today due to thin fog and haziness
associated with pollen. The view has been no more than 30 miles.

The maximum temperature so far today is 51F degrees, which is 13
degrees below the normal high of 64F. The minimum temperature
since midnight is 42F degrees, which is 3 degrees below the
normal low of 45F.

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Today’s Observations:

7 A.M.
Weather: Overcast stratus, virga distant ESE-SW-NW
Temperature: 45F; Dew Point: 41F; Relative Humidity: 89%
Wind: SSE @ 5 kts, wind light
Sea-level pressure: 1028.6 mb; 30.38 in. Hg: rising, then more slowly
Visibility: 30 miles, 15 miles SW-NW, thin fog
6-hr Max temp: 45F
6-hr Min temp: 42F
24-hr Precip:  0.00 inches
BHO 1155 E8 OVC 30 286/45/41/1605/038/ THN F ALQDS VIRGA DSNT
ESE-SW-NW VSBY 15 SW-NW WND LGT/ 8/6// 51005 10045 20042

10 A.M.
Weather: Overcast stratus
Temperature: 49F; Dew Point: 43F; Relative Humidity: 80%
Wind: S @ 7 kts, wind ESE variable S
Sea-level pressure: 1027.3 mb; 30.33 in. Hg: falling, then more rapidly
Visibility: 25 miles, hazy
3-hr Precip:  0.00 inches
BHO SA 1455 E14 OVC 25 273/49/43/1707/034/ WND 12V19 HAZY/ 8/6//
58013

1 P.M.
Weather: Overcast stratocumulus, few lower stratus fractus distant
N-ENE
Temperature: 50F; Dew Point: 44F; Relative Humidity: 80%
Wind: S @ 7 kts
Sea-level pressure: 1026.1 mb; 30.30 in. Hg: falling, then more rapidly
Visibility: 25 miles, hazy
6-hr Max temp: 51F
6-hr Min temp: 45F
6-hr Precip:  Trace
BHO SA 1755 E14 OVC 25 261/50/44/1807/030/ FEW LWR STFRA DSNT N-ENE
RW-B02E36 HAZY/ 8/5// 58012 6000/ 10051 20045

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SUMMARY FOR SATURDAY, MAY 4, 2024

TEMPERATURE (DEGREES F)
MAX…….55   NORMAL…..64
MIN…….44   NORMAL…..45
MEAN……50   NORMAL…..54

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….-4
TOTAL DEPARTURE FOR THE MONTH…………………….-9 [-2.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………15  DEPARTURE……..+4
TOTAL HEATING UNITS FOR THE MONTH……………54  DEPARTURE……..+8
TOTAL HEATING UNITS FOR THE SEASON…………5211  DEPARTURE……-722
TOTAL HEATING UNITS LAST SEASON TO DATE…….5035  DEPARTURE……+176

COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………….0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE SEASON……………0  DEPARTURE……..-4
TOTAL COOLING UNITS LAST SEASON TO DATE……….9  DEPARTURE……..-9

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
E=Estimated

F420C (Official)……….E22 ENE  @  08:18 A.M.
VECTOR #1 (1-Sec)……….21 NE   @  01:40 P.M.
VECTOR #2 (1-Sec)……….22 ENE  @  01:49 P.M.
DAVIS #1……………….21 E    @  11:56 A.M.
DAVIS #2 ………………20 ENE  @  08:17 A.M.
RMY #1 (Instantaneous)…..21 E    @  11:56 A.M.
RMY #2 (Instantaneous)…..23 ENE  @  01:49 P.M.
MERLIN…………………19 ENE
RICHARDS (C5C) (Inst)……20      @  11:56 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 ENE  @  01:50 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14      @  08:20 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15      @  08:20 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 E    @  08:20 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 E    @  08:20 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..15 ENE  @  08:20 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 ENE  @  08:20 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………14      @  08:20 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….7.8 ENE [187 total miles] VECTOR #1……………..7.8
VECTOR #2……………..8.3
DAVIS #1………………8.5 E
DAVIS #2………………8.3 E
RMY #1………………..7.9 E
RMY #2………………..8.2 E
RICHARDS (C5C)…………8.6

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..0.29 DEPARTURE…..-0.21
TOTAL PRECIPITATION FOR THE YEAR (2024)…….25.25 DEPARTURE…..+5.97

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE MONTH………………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE SEASON (2023-2024)……26.8 DEPARTURE…..-42.9

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PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

5/1   53/42/48/-5/0.06/0.0/…/..         18 ESE VEC1 18 ESE RMY 18
5/2   69/44/57/+3/0.21/0.0/…/..         35 NE  VEC1 36 NE  RMY 35 TSTM
5/3   57/44/51/-3/0.02/0.0/…/..         24 NE  VEC1 24 NE  RMY 25
5/4   55/44/50/-4/0.00/0.0/…/..         22 ENE VEC1 21 NE  RMY 21

5/5 The low since midnight is 42F, the daily normal low is 45F.

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MAY 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 MAY 5
HIGH 92F IN 1949
LOW 30F IN 1891
PRECIP 2.74 INCHES IN 1922
SNOWFALL 3.0 INCHES IN 1917
PEAK GUST 58 MPH S IN 1966 & 58e MPH SW IN 1976

RECORDS FOR MAY 6
HIGH 90F IN 1930
LOW 29F IN 1891
PRECIP 1.04 INCHES IN 1890
SNOWFALL TRACE IN 1917, 1952, 1996
PEAK GUST 65 MPH SSE IN 1989

TODAY’S REPORT PREPARED BY: Matt Douglas