Thursday, May 2, 2024

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

THURSDAY, MAY 2, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0437E
SUNSET:  1846E

A MIX OF SUN AND CLOUDS WITH WARMING TEMPERATURES TODAY AT BLUE HILL….

A mix of sun and clouds this morning has transitioned to more
of a clear sky this afternoon, as such a very pleasant day is
ongoing with warming temperatures and comfortable humidity
levels.

Temperatures have warmed into the mid-upper 60s this afternoon
making for quite a nice afternoon. The dew point has been
gradually rising from the mid 40s early this morning to the mid
50s this afternoon. Despite this increase in the moisture content
of the air, it’s still comfortable.

The wind has been southerly today with a decrease in speeds
from this morning into this afternoon. Winds were gusting just
over 30mph for a time this morning, but has gone to light speeds
this afternoon. The average speed for the day so far is around
12mph. The peak gust to this point has been 32mph, which occurred
around 7:15am this morning.

Visibility has been gradually increasing since early this morning
with the view going from around 20 miles this morning to around
40 miles early this afternoon.

The maximum temperature so far today is 68F degrees, which is
5 degrees above the normal high of 63F. The minimum temperature
since midnight is 45F degrees, which is 1 degree above the
normal low of 44F.

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PRELIMINARY STATS FOR APRIL 2024

TEMPERATURE, Deg. F
Avg. Max. 57.0 [+0.7] Avg. Min. 38.3 [+0.4] Mean      47.7 [+0.6] 24-hour corrected mean: 46.8
Max. for month: 73F on the 15th
Min. for month: 29F on the 25th

HEATING DEGREE DAYS
Total heating units:    527 [-013] Total for the season:  5168 [-719] Total for last season: 4971

COOLING DEGREE DAYS
Total cooling units:    000 [-003] Total for the season:   000 [-003] Total for last season:  009

PRECIPITATION, Inches
Total: 4.91 [+0.15] Greatest in 24 hrs: 2.06 on the 3rd-4th

SNOWFALL, Inches
Total: 0.7 [-2.1] Greatest in 24 hrs: 0.7 on the 4th

WIND, mph
Avg. uncorrected wind speed: 11.5 mph
Avg. corrected wind speed:   12.0 mph
Prevailing wind direction:   Northwest [11%] Peak gust and direction:  63 ENE on the 4th

SUNSHINE:
Campbell-Stokes card minutes: 10554 of a possible 23250, or 45%
Astronomical total minutes: 10947 of a possible 24146, or 45%

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Today’s Observations:

7 A.M.
Weather: Scattered stratus fractus, scattered altocumulus/castellanus
Temperature: 49F; Dew Point: 45F; Relative Humidity: 85%
Wind: S @ 14G25 kts
Sea-level pressure: 1015.0 mb; 29.97 in. Hg: falling, then more slowly
Visibility: 20 miles, thin fog
6-hr Max temp: 49F
6-hr Min temp: 45F
24-hr Precip:  0.00 inches
BHO SA 1155 15 SCT 100 SCT 20 150/49/45/1914G25/997/ THN F ALQDS/
8/780 56013 10049 20045

10 A.M.
Weather: Broken stratocumulus, overcast altocumulus/castellanus,
few breaks in overcast overhead
Temperature: 54F; Dew Point: 49F; Relative Humidity: 82%
Wind: SW @ 12G18 kts
Sea-level pressure: 1014.7 mb; 29.96 in. Hg: rising, then falling
Visibility: 25 miles, hazy
3-hr Precip:  0.00 inches
BHO SA 1455 E15 BKN 65 OVC 25 147/54/49/2212G18/996/ FEW BINOVC OVHD
SUN OCNLY DMLY VSBL HAZY/ 8/58/ 58003

1 P.M.
Weather: Clear, few cumulus distant all quadrants, few altocumulus/
castellanus distant N-E-S, few cirrus distant E-S-WSW
Temperature: 64F; Dew Point: 52F; Relative Humidity: 65%
Wind: SSW @ 6 kts, wind light
Sea-level pressure: 1012.9 mb; 29.91 in. Hg: falling, then more slowly
Visibility: 40 miles, hazy
6-hr Max temp: 65F
6-hr Min temp: 49F
6-hr Precip:  0.00 inches
BHO SA 1755 CLR 40 129/64/52/2106/991/ FEW CU DSNT ALQDS FEW AC/ACC
DSNT N-E-S FEW CI DSNT E-S-WSW HAZY WND LGT/ 8/281 56018 10065 20049

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SUMMARY FOR WEDNESDAY, MAY 1, 2024

TEMPERATURE (DEGREES F)
MAX…….53   NORMAL…..63
MIN…….42   NORMAL…..44
MEAN……48   NORMAL…..53

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….-5
TOTAL DEPARTURE FOR THE MONTH…………………….-5 [+4.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………17  DEPARTURE……..+5
TOTAL HEATING UNITS FOR THE MONTH……………17  DEPARTURE……..+5
TOTAL HEATING UNITS FOR THE SEASON…………5185  DEPARTURE……-714
TOTAL HEATING UNITS LAST SEASON TO DATE…….4982  DEPARTURE……+203

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………0
TOTAL COOLING UNITS FOR THE SEASON……………0  DEPARTURE……..-3
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)……….E18 ESE  @  12:07 A.M.
VECTOR #1 (1-Sec)……….18 ESE  @  12:07 A.M.
VECTOR #2 (1-Sec)……….17 E    @  12:29 A.M.
DAVIS #1……………….17 E    @  12:28 A.M.
DAVIS #2 ………………19 S    @  11:52 P.M.
RMY #1 (Instantaneous)…..18 ESE  @  12:06 A.M.
RMY #2 (Instantaneous)…..17 E    @  12:07 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)……17      @  12:06 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………13 E    @  12:30 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14      @  12:08 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..13      @  12:33 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 E    @  12:30 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………14 S    @  11:50 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..13 ESE  @  12:08 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..13 E    @  12:33 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………13      @  12:08 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….6.3 ENE [150 total miles] VECTOR #1……………..6.5
VECTOR #2……………..6.8
DAVIS #1………………6.5 ENE
DAVIS #2………………6.5 E
RMY #1………………..6.5 ENE
RMY #2………………..6.7 ENE
RICHARDS (C5C)…………7.1

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..0.06 DEPARTURE…..-0.07
TOTAL PRECIPITATION FOR THE YEAR (2024)…….25.02 DEPARTURE…..+6.11

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 APRIL 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)

4/1   56/40/48/+7/0.00/0.0/153/20         20 SSE VEC1 20 SSE RMY 19
4/2   47/35/41/0/0.07/0.0/115/15          25 E   VEC1 25 E   RMY 25
4/3   41/34/38/-4/1.10/T/000/00           53 E   VEC1 53 E   RMY 53
4/4   36/32/34/-8/1.25/0.7/000/00         63 ENE VEC1 64 ENE RMY 68
4/5   45/31/38/-5/0.01/T/147/19           33 WNW VEC1 31 WNW RMY 33
4/6   43/33/38/-5/0.08/093/12             35 N   VEC1 35 N   RMY 35
4/7   48/34/41/-3/T/0.0/094/12            32 N   VEC1 31 N   RMY 31
4/8   66/36/51/+7/0.00/0.0/636/81         23 WNW VEC1 23 WNW RMY 22
4/9   63/40/52/+8/0.00/0.0/741/94         22 ENE VEC1 21 ENE RMY 21
4/10  65/38/52/+7/T/0.0/348/44            26 S   VEC1 26 S   RMY 30
4/11  55/42/49/+4/0.04/0.0/000/00         32 SSE VEC1 32 SSE RMY 31
4/12  60/46/53/+7/1.03/0.0/032/04         62 SSE VEC1 62 S   RMY 63
4/13  54/43/49/+3/T/0.0/271/34            43 W   VEC1 42 WNW RMY 46
4/14  58/42/50/+3/0.09/0.0/384/48         33 WSW VEC1 33 WSW RMY 35
4/15  73/43/58/+11/T/0.0/764/95           33 NW  VEC1 33 NW  RMY 34
4/16  68/44/56/+9/0.00/0.0/759/94         29 NW  VEC1 28 NW  RMY 29
4/17  60/40/50/+2/0.00/0.0/656/81         25 ESE VEC1 24 ESE RMY 24
4/18  47/40/44/-4/0.21/0.0/000/00         25 E   VEC1 25 E   RMY 23
4/19  60/41/51/+2/T/0.0/399/49            29 S   VEC1 29 S   RMY 29
4/20  57/40/49/0/0.38/0.0/082/10          34 WNW VEC1 37 WNW RMY 39
4/21  50/34/42/-8/0.00/0.0/295/36         30 NW  VEC1 30 WNW RMY 31
4/22  57/34/46/-4/0.00/0.0/822/100        29 NW  VEC1 29 NW  RMY 29
4/23  63/37/50/0/0.00/0.0/710/86          30 S   VEC1 29 S   RMY 29
4/24  63/33/48/-3/0.04/0.0/265/32         52 WNW VEC1 51 WNW RMY 58
4/25  55/29/42/-9/0.00/0.0/831/100        28 SE  VEC1 28 SE  RMY 26
4/26  56/32/44/-8/0.00/0.0/833/100        25 S   VEC1 24 S   RMY 24
4/27  66/37/52/0/0.00/0.0/627/75          26 SW  VEC1 27 SW  RMY 27
4/28  67/41/54/+2/0.02/0.0/385/46         28 WSW VEC1 27 WSW RMY 29
4/29  70/53/62/+9/0.00/0.0/446/53         26 ENE VEC1 25 ENE RMY 27
4/30  60/44/52/-1/0.59/0.0/059/07         25 E   VEC1 23 SSE RMY 26 TSTM

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APRIL DAILY RECORDS TO DATE

NONE…

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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 The low since midnight is 45F, the daily normal low is 44F.

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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 2
HIGH 92F IN 2001
LOW 29F IN 1903
PRECIP 1.36 INCHES IN 2006
SNOWFALL TRACE IN 1920, 1941
PEAK GUST 58 MPH S IN 1983

RECORDS FOR MAY 3
HIGH 92F IN 2001
LOW 31F IN 1888
PRECIP 2.25 INS IN 1900
SNOWFALL TRACE IN 1908, 1985
PEAK GUST 71 MPH W IN 2002

TODAY’S REPORT PREPARED BY: Matt Douglas