Sunday, May 7, 2023

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

SUNDAY, MAY 7, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0432E
SUNSET:  1850E

WARM AND DRY WITH PLENTY OF SUNSHINE AND A DEVELOPING BREEZE…

Today has featured plenty of sunshine with only some fair weather
cumulus popping up late this morning into the afternoon.
Temperatures have responded nicely with readings quickly reaching
the low 70 by late morning, and mid to upper 70s early this
afternoon.

Winds were light most of the morning, but have picked up a bit
early this afternoon with some mixing from aloft. The wind has
been mainly out of a northwesterly direction. It’s perfect out
there for any and all outdoor activities. The average speed for
the day has been around 11mph thus far. The highest gust so far
has been around 25mph, occurring around 12:30pm!

Visibility has been excellent all day with views of 70-80 miles.

The maximum temperature so far today is 77F, this is 12 degrees
above the normal high of 65F. The low since midnight is 52F,
which is 6 degrees above the normal low of 46F.

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Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus distant N-NE, few cirrus distant
W-NW and distant NE-SE
Temperature: 59F; Dew Point: 39F; Relative Humidity: 46%
Wind: WNW @ 9 kts
Sea-level pressure: 1016.2 mb; 30.01 in. Hg: falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 59F
6-hr Min temp: 52F
24-hr Precip:  0.00 ins.
BHO SA 1155 CLR 70 162/59/39/3009/001/ FEW AC DSNT N-NE FEW CI DSNT
W-NW AND DSNT NE-SE/ 8/051 58005 10059 20052

10 A.M.
Weather: Clear, few small cumulus SW-Nw-NNE, few altocumulus
distant NE-E, few cirrus distant SW-WNW
Temperature: 71F; Dew Point: 40F; Relative Humidity: 31%
Wind: NW @ 5 kts, wind light
Sea-level pressure: 1014.6 mb; 29.96 in. Hg: falling steadily
Visibility: 70 miles
3-hr Precip:  0.00 ins.
BHO SA 1455 CLR 70 146/71/40/3205/996/ FEW SML CU SW-NW-NNE
FEW AC DSNT NE-E FEW CI DSNT SW-WNW WND LGT/ 8/151 57016

1 P.M.
Weather: Clear, few small cumulus all quadrants, few cirrus
all quadrants
Temperature: 76F; Dew Point: 37F; Relative Humidity: 24%
Wind: WNW @ 13G22 kts
Sea-level pressure: 1011.8 mb; 29.88 in. Hg: falling, then more rapidly
Visibility: 80 miles
6-hr Max temp: 77F
6-hr Min temp: 59F
6-hr Precip:  0.00 ins.
BHO SA 1755 CLR 80 118/76/37/2913G22/988/ FEW SML CU ALQDS
FEW CI ALQDS/ 8/101 58028 10077 20059

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SUMMARY FOR SATURDAY, MAY 6, 2023

TEMPERATURE (DEGREES F)
MAX…….74   NORMAL…..64
MIN…….43   NORMAL…..45
MEAN……59   NORMAL…..55

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………+4
TOTAL DEPARTURE FOR THE MONTH………………..-19 [-3.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….6  DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE MONTH……………74  DEPARTURE……..+6
TOTAL HEATING UNITS FOR THE SEASON…………5045  DEPARTURE……-910
TOTAL HEATING UNITS LAST SEASON TO DATE…….5436  DEPARTURE……-391

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH…………….0  DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE SEASON……………9  DEPARTURE……..+4
TOTAL COOLING UNITS LAST SEASON TO DATE……….0  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)………..25 NW  @   11:29 A.M.
VECTOR #1 (1-Sec)……….26 NW  @    2:49 P.M.
VECTOR #2 (1-Sec)……….27 NW  @    4:57 P.M.
DAVIS #1……………….26 W   @   11:29 A.M.
DAVIS #2 ………………24 NNW @   11:29 A.M.
RMY #1 (Instantaneous)…..26 NW  @    2:49 P.M.
RMY #2 (Instantaneous)…..28 NNW @   11:33 A.M.
MERLIN…………………24 NW
RICHARDS (C5C) (Inst)……27     @   11:28 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………17 NW  @   12:02 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17     @   11:31 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20     @   11:30 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 NW  @    2:50 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 NNW @   11:31 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..17 NW  @    2:50 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 NW  @   11:31 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18     @    2:50 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………11.3 NW [270 total miles] VECTOR #1……………….11.1
VECTOR #2……………….11.9
DAVIS #1………………..11.3 NW
DAVIS #2………………..11.6 NNW
RMY #1………………….10.8 NW
RMY #2………………….11.6 NW
RICHARDS (C5C)…………..11.5

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..0.41 DEPARTURE…..-0.34
TOTAL PRECIPITATION FOR THE YEAR…………..18.61 DEPARTURE…..-0.92

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 (2022-2023)……34.9 DEPARTURE…..-34.8

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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

5/1   63/45/54/+1/0.04/0.0/540/64         44 SSE  VEC1 46 SSE RMY 48
5/2   57/43/50/-4/0.22/0.0/144/17         33 S    VEC1 34 S   RMY 35
5/3   55/42/49/-5/0.01/0.0/093/11         25 E    VEC1 25 E   RMY 25
5/4   45/40/43/-11/0.07/0.0/009/01        29 NE   VEC1 29 NE  RMY 29
5/5   59/43/51/-4/0.07/0.0/367/43         18 NE   VEC1 19 NE  RMY 19
5/6   74/43/59/+4/0.00/0.0/847/99         25 NW   VEC1 26 NW  RMY 26

5/7 The low since midnight is 52, the daily normal low is 46F

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

RECORDS FOR MAY 7
HIGH 93F IN 1930
LOW 33F IN 1970
PRECIP 1.19 INCHES IN 2005
SNOWFALL TRACE IN 1967
PEAK GUST 66e MPH WNW IN 1940

RECORDS FOR MAY 8
HIGH 89F IN 2000
LOW 29F IN 1956
PRECIP 1.48 INCHES IN 1886
SNOWFALL TRACE IN 1898, 1947
PEAK GUST 68e MPH NNW IN 1943

TODAY’S REPORT PREPARED BY: Matt Douglas