Thursday, April 18, 2024

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

THURSDAY, APRIL 18, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0458E
SUNSET:  1830E

OVERCAST AND CHILLY TODAY WITH RAIN SHOWERS DEVELOPING….

Today has featured cloudy skies with much cooler temperatures
than we’ve seen recently. Light rain showers moved into the
area during the mid morning hours, and has continued off and
on since. 0.02″ of rain was measured between 7am-1pm today.

Temperatures are on the cool side, and are actually 10-15
degrees below normal for the date. Readings have been held in
the 40s all day. With the onshore breeze and wet conditions,
it definitely feels raw out there today.

The wind hasn’t been all that strong today, but it’s been steady
enough to add a decided chill to the air. It’s been mainly out
of the east today, averaging at around 10mph. The peak gust so
far is 26mph, which occurred just before 4:30am.

Visibility started the day at around 60 miles, but became
limited due to the rain showers by mid morning. It has been
generally under 30 miles since that time.

The maximum temperature so far today is 47F degrees, which is
11 degrees below the normal high of 58F. The minimum temperature
since midnight is 40F degrees, which is 1 degree above the
normal low of 39F.

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Today’s Observations:

7 A.M.
Weather: Overcast altostratus, few breaks in overcast distant N-ESE,
few stratocumulus distant NW-NNE, higher clouds visible distant N-ESE
Temperature: 42F; Dew Point: 33F; Relative Humidity: 70%
Wind: E @ 9 kts
Sea-level pressure: 1021.9 mb; 30.18 in. Hg: rising, then more slowly
Visibility: 60 miles
6-hr Max temp: 45F
6-hr Min temp: 42F
24-hr Precip:  0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 E55 OVC 60 219/42/33/0909/018/ FEW BINOVC DSNT N-ESE
FEW SC DSNT NW-NNE HIER CLDS VSBL DSNT N-ESE VIRGA DSNT W AND DSNT NNW/
8/52/ 51015 10045 20042

10 A.M.
Weather: Overcast altostratus, breaks in overcast distant N-ESE,
few stratocumulus distant NW-N, higher clouds visible distant N-ESE
Temperature: 45F; Dew Point: 33F; Relative Humidity: 60%
Wind: E @ 9G17 kts
Sea-level pressure: 1021.8 mb; 30.17 in. Hg: rising, then falling
Visibility: 30 miles
3-hr Precip:  Trace
3-hr Snowfall: 0.0 inches
BHO SA 1455 E50 OVC 30 218/45/33/1009G17/017/ BINOVC DSNT N-ESE
FEW SC DSNT NW-N HIER CLDS VSBL DSNT N-ESE VIRGA DSNT W-N RW-E32/
8/52/ 58001 6000/

1 P.M.
Weather: Overcast altostratus, breaks in overcast distant N-ESE,
few stratocumulus distant NW-N, higher clouds visible distant N-ESE
Temperature: 45F; Dew Point: 40F; Relative Humidity: 82%
Wind: ENE @ 6 kts, wind light and variable
Sea-level pressure: 1022.1 mb; 30.18 in. Hg: rising, then falling
Visibility: 30 miles, 20 miles W-NW
6-hr Max temp: 47F
6-hr Min temp: 40F
6-hr Precip:  0.02 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E60 OVC 30 221/45/40/0706/018/ BINOVC DSNT NNE-ESE
FEW SC DSNT NNE HIER CLDS VSBL DSNT NNE-ESE VIRGA ALQDS RW-E43
VSBY 20 W-NW WND L/V/ 8/52/ 50003 6002/ 10047 20040

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SUMMARY FOR WEDNESDAY, APRIL 17, 2024

TEMPERATURE (DEGREES F)
MAX…….60   NORMAL…..57
MIN…….40   NORMAL…..39
MEAN……50   NORMAL…..48

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+2
TOTAL DEPARTURE FOR THE MONTH……………………+43 [+2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………15  DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE MONTH…………..318  DEPARTURE…….-34
TOTAL HEATING UNITS FOR THE SEASON…………4959  DEPARTURE……-740
TOTAL HEATING UNITS LAST SEASON TO DATE…….4772  DEPARTURE……+187

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)……….E25 ESE  @  03:16 P.M.
VECTOR #1 (1-Sec)……….24 ESE  @  03:01 P.M.
VECTOR #2 (1-Sec)……….24 ENE  @  01:34 A.M.
DAVIS #1……………….24 ENE  @  12:58 A.M.
DAVIS #2 ………………28 S    @  05:34 P.M.
RMY #1 (Instantaneous)…..24 ESE  @  03:12 P.M.
RMY #2 (Instantaneous)…..25 NE   @  12:02 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)……22      @  12:58 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………17 NE   @  12:10 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18      @  03:01 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18      @  04:10 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 ESE  @  03:14 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 S    @  05:35 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..17 ESE  @  03:14 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 S    @  05:35 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18      @  03:14 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….9.1 ENE [219 total miles] VECTOR #1……………..9.0
VECTOR #2……………..9.7
DAVIS #1………………9.4 ESE
DAVIS #2………………9.4 ESE
RMY #1………………..9.0 ESE
RMY #2………………..9.5 E
RICHARDS (C5C)…………9.6

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.15
TOTAL PRECIPITATION FOR THE MONTH…………..3.67 DEPARTURE…..+0.80
TOTAL PRECIPITATION FOR THE YEAR (2024)…….23.72 DEPARTURE…..+6.83

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.1
TOTAL SNOWFALL FOR THE MONTH………………..0.7 DEPARTURE……-1.7
TOTAL SNOWFALL FOR THE SEASON (2023-2024)……26.8 DEPARTURE…..-42.5

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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 The low since midnight is 40F, the daily normal low is 39F.

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APRIL 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 APRIL 18
HIGH 92 IN 1976
LOW 23 1887
PRECIP 1.48 IN 1954
SNOWFALL 4.3 IN. IN 2020
PEAK GUST 59 MPH S IN 1982

RECORDS FOR APRIL 19
HIGH 94 IN 1976 [RECORD FOR MONTH] LOW 21 IN 1890
PRECIP 1.71 IN 1969
SNOWFALL 1.3 IN. IN 1967
PEAK GUST 66 MPH E IN 1984

TODAY’S REPORT PREPARED BY: Matt Douglas