Monday, May 6, 2024

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

MONDAY, MAY 6, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0432E
SUNSET:  1850E

MUCH WARMER TODAY UNDER A MIX OF SUN AND CLOUDS….

We started the day with overcast skies and dense fog. They burned
off fairly quickly, and by mid morning we had a period of mainly
sunny skies. Clouds have increased once again however as the day
time heating has allowed numerous cumulus clouds to develop. Mid
and high level clouds are also advancing into the region from the
west.

Temperatures have warmed quite a bit today with readings reaching
the low 70s early this afternoon. The dew point is also creeping
up nearing the 60F degree mark, so it actually feels a bit humid
out there today.

The wind has been on the light side with an average speed of only
around 8mph. The wind has been gradually veering from the south-
southwest to the west. The peak gust for the day so far is only
15mph, occurring just before 3am.

Visibility was quite limited early this morning with the fog,
but improved nicely to around 60 miles by mid morning. There is
a fair amount of haziness despite the decent visibility, caused
primarily by pollen in the air as well as the increased moisture
content in the air.

The maximum temperature so far today is 72F degrees, which is 8
degrees above the normal high of 64F. The minimum temperature
since midnight is 46F degrees, which is 1 degree above the
normal low of 45F.

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Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 300ft
Temperature: 52F; Dew Point: 52F; Relative Humidity: 99%
Wind: WSW @ 6 kts, wind light
Sea-level pressure: 1017.6 mb; 30.05 in. Hg: falling, then more rapidly
Visibility: 1.5 miles, 5 miles N-NE, thin fog
6-hr Max temp: 52F
6-hr Min temp: 47F
24-hr Precip:  0.37 inches
BHO SA 1155 X W3 11/2F 176/52/52/2406/005/ VSBY 5 N-NE WND LGT/
8//// 58006 6001/ 70037 10052 20047

10 A.M.
Weather: Scattered stratocumulus, scattered altocumulus, thin broken
cirrus, few lower stratocumulus distant ENE-S-WSW
Temperature: 63F; Dew Point: 57F; Relative Humidity: 77%
Wind: SSW @ 5 kts, wind light
Sea-level pressure: 1016.4 mb; 30.01 in. Hg: falling, then more rapidly
Visibility: 60 miles
3-hr Precip:  0.00 inches
BHO SA 1455 22 SCT 100 SCT E250 -BKN 60 164/63/57/2005/001/ FEW LWR SC
DSNT ENE-S-WSW WND LGT/ 8/551 58012

1 P.M.
Weather: Broken cumulus, broken altocumulus, thin broken cirrus
Temperature: 71F; Dew Point: 59F; Relative Humidity: 66%
Wind: W @ 8 kts
Sea-level pressure: 1013.8 mb; 29.94 in. Hg: falling, then more rapidly
Visibility: 60 miles
6-hr Max temp: 72F
6-hr Min temp: 52F
6-hr Precip:  0.00 inches
BHO SA 1755 E27 BKN 85 BKN 250 -BKN 60 138/71/59/2708/994/ 8/251 58026
10072 20052

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SUMMARY FOR SUNDAY, MAY 5, 2024

TEMPERATURE (DEGREES F)
MAX…….51   NORMAL…..64
MIN…….42   NORMAL…..45
MEAN……47   NORMAL…..55

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….-8
TOTAL DEPARTURE FOR THE MONTH……………………-17 [-3.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………18  DEPARTURE……..+7
TOTAL HEATING UNITS FOR THE MONTH……………72  DEPARTURE…….+15
TOTAL HEATING UNITS FOR THE SEASON…………5229  DEPARTURE……-715
TOTAL HEATING UNITS LAST SEASON TO DATE…….5049  DEPARTURE……+180

COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH…………….0  DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE SEASON……………0  DEPARTURE……..-5
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)……….E21 S    @  07:02 P.M.
VECTOR #1 (1-Sec)……….22 S    @  05:54 P.M.
VECTOR #2 (1-Sec)……….22 S    @  06:17 P.M.
DAVIS #1……………….23 S    @  05:58 P.M.
DAVIS #2 ………………29 S    @  05:52 P.M.
RMY #1 (Instantaneous)…..21 S    @  05:59 P.M.
RMY #2 (Instantaneous)…..22 S    @  05:54 P.M.
MERLIN…………………19 S
RICHARDS (C5C) (Inst)……21      @  06:55 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 S    @  05:52 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16      @  06:48 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16      @  06:48 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 S    @  06:23 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 S    @  06:49 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..15 S    @  06:48 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..17 S    @  06:49 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15      @  07:03 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….8.0 S [192 total miles] VECTOR #1……………..8.4
VECTOR #2……………..8.8
DAVIS #1………………8.0 SSE
DAVIS #2………………8.8 S
RMY #1………………..8.2 SSE
RMY #2………………..8.8 SSE
RICHARDS (C5C)…………8.7

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.37 DEPARTURE…..+0.24
TOTAL PRECIPITATION FOR THE MONTH…………..0.66 DEPARTURE…..+0.03
TOTAL PRECIPITATION FOR THE YEAR (2024)…….25.62 DEPARTURE…..+6.21

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   51/42/47/-8/0.35/0.0/…/..         21 S   VEC1 22 S   RMY 21

5/6 The low since midnight is 46F, 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 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

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

TODAY’S REPORT PREPARED BY: Matt Douglas