Saturday, May 13, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, MAY 13, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0425E
SUNSET: 1857E
CLOUDY SUNRISE WITH DECREASING CLOUDS THROUGH THE MORNING AND A
MOSTLY SUNNY AFTERNOON…
Early to mid morning, broken layers of altocumulus and cirrostratus
dissipated as temperatures rose and humidity began to drop. At
about 8 AM, mostly sunny conditions were prevalent at Great Blue
Hill.
Pollen clouds are puffing off the trees in the distance to our west
which is likely the cause of at least some of the haze seen, as
our humidity has stayed relatively low all day, only peaking at about
50-60% in the early morning and dropping to about 27% in the early
afternoon.
The high so far today was 80F, which is 14 degrees above our normal
max temperature of 66F. Our low since midnight was 61F, which is
14 degrees above our normal low temperature of 47F, and only 5
degrees below our normal max temperature of 66F.
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Today’s Observations:
7 A.M.
Weather: Broken altocumulus, broken cirrostratus
Temperature: 64F; Dew Point: 39F; Relative Humidity: 52%
Wind: NW @ 10 kts
Sea-level pressure: 1015.7 mb; 29.99 in. Hg: rising, then more slowly
Visibility: 40 miles, hazy
6-hr Max temp: 65F
6-hr Min temp: 61F
24-hr Precip: Trace
BHO SA 1155 E160 BKN E250 BKN 40 157/64/39/3210/999/ HAZY/ 8/055 51014
70000 10065 20061
10 A.M.
Weather: Scattered altocumulus, scattered cirrostratus
Temperature: 72F; Dew Point: 50F; Relative Humidity: 46%
Wind: NNW @ 7 kts
Sea-level pressure: 1016.1 mb; 30.00in. Hg: rising then steady
Visibility: 40 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 160 SCT 250 SCT 40 161/72/50/3307/000/ HAZY/ 8/055 51004
1 P.M.
Weather: Scattered cirrostratus, few cumulus E-SSW
Temperature: 79F; Dew Point: 42F; Relative Humidity: 27%
Wind: NW @ 12 kts
Sea-level pressure: 1014.6 mb; 29.96 in. Hg: falling unsteadily
Visibility: 40 miles, hazy
6-hr Max temp: 80F
6-hr Min temp: 64F
6-hr Precip: 0.00 ins.
BHO SA 1755 250 SCT 40 146/79/42/3112/996/ FEW CU E-SSW HAZY
8/105 57015 10080 20064
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SUMMARY FOR FRIDAY, MAY 12, 2023
TEMPERATURE (DEGREES F)
MAX…….84 NORMAL…..66
MIN…….57 NORMAL…..47
MEAN……71 NORMAL…..57
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……..+14
TOTAL DEPARTURE FOR THE MONTH………………..+26 [+1.9 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-9
TOTAL HEATING UNITS FOR THE MONTH……………92 DEPARTURE…….-34
TOTAL HEATING UNITS FOR THE SEASON…………5036 DEPARTURE……-950
TOTAL HEATING UNITS LAST SEASON TO DATE…….5528 DEPARTURE……-465
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….6 DEPARTURE……..+5
TOTAL COOLING UNITS FOR THE MONTH…………….8 DEPARTURE……..+3
TOTAL COOLING UNITS FOR THE SEASON…………..17 DEPARTURE……..+9
TOTAL COOLING UNITS LAST SEASON TO DATE……….0 DEPARTURE…….+17
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)……….E31 WNW @ 11:01 A.M.
VECTOR #1 (1-Sec)……….33 WNW @ 11:01 A.M.
VECTOR #2 (1-Sec)……….37 WNW @ 11:01 A.M.
DAVIS #1……………….33 W @ 11:53 A.M.
DAVIS #2 ………………36 W @ 11:54 A.M.
RMY #1 (Instantaneous)…..34 WNW @ 11:01 A.M.
RMY #2 (Instantaneous)…..38 WNW @ 11:54 A.M.
MERLIN…………………34 W
RICHARDS (C5C) (Inst)……35 @ 02:04 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………24 WNW @ 11:13 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..23 @ 11:12 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..25 @ 11:03 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………25 W @ 11:13 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………25 W @ 10:56 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..22 WNW @ 11:12 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..24 WNW @ 11:13 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………23 @ 11:12 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………11.8 WNW [282 total miles]
VECTOR #1……………….11.6
VECTOR #2……………….12.5
DAVIS #1………………..12.1 W
DAVIS #2………………..12.4 WNW
RMY #1………………….11.1 WNW
RMY #2………………….12.3 WNW
RICHARDS (C5C)…………..11.8
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..0.45 DEPARTURE…..-0.99
TOTAL PRECIPITATION FOR THE YEAR…………..18.65 DEPARTURE…..-1.57
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 78/52/65/+10/0.01/0.0/…/.. 26 WNW VEC1 27 W RMY 28
5/8 74/49/62/+7/0.03/0.0/…/.. 32 NW VEC1 33 NW RMY 35
5/9 60/45/53/-3/0.00/0.0/…/.. 24 NE VEC1 25 NE RMY 25
5/10 72/51/62/+6/0.00/0.0/…/.. 25 WSW VEC1 26 WSW RMY 26
5/11 81/53/67/+11/T/0.0/…/.. 30 W VEC1 30 W RMY 30
5/12 84/57/71/+14/T/0.0/…/.. 31 WNW VEC1 35 WNW RMY 34
5/13 The low since midnight is 61, the daily normal low is 47F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR MAY 13
HIGH 85F IN 1947
LOW 32F IN 2020
PRECIP 2.39 INCHES IN 2006
PEAK GUST 49 MPH NNW IN 1965
RECORDS FOR MAY 14
HIGH 85F IN 1961,2022
LOW 33F IN 1895
PRECIP 1.93 INCHES IN 2006
PEAK GUST 53 MPH S IN 2009
TODAY’S REPORT PREPARED BY: Samantha Richard
