Wednesday, April 5, 2023

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

WEDNESDAY, APRIL 5, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0520E
SUNSET:  1814E

RATHER BRISK WITH OVERCAST SKIES AND COOLING TEMPERATURES…

Clouds have dominated the sky today with 0 minutes of sunshine
being recorded so far today. A brisk onshore wind has also been
the theme today helping to advect a cooler air mass down from
the Gulf of Maine. As a matter of fact, temperatures have been
inching downward all day, with the high for the day occurring
back at midnight, and a low in the upper 30s occurring at
around the 1pm observation.

As mentioned, the wind has been quite busy with east to east-
northeast winds averaging around 13mph for the day so far.
Frequent gusts of 30-35mph were common all morning, but have
since started to wane as we move through the early afternoon
hours. The peak gust for the day thus far is 33mph officially.

Visibility has been decreasing as the day progresses as well,
starting at around 40 miles early this morning, down to around
15 miles early this afternoon.

The high temperature so far today is 45F, which is 7 degrees
below the normal maximum temperature for today of 52F. The low
since midnight is 39F, which is 5 degrees above our normal
minimum temperature of 34F.

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PRELIMINARY STATS FOR MARCH 2023

TEMPERATURE, Deg. F
Avg. Max. 46.2 [+2.1] Avg. Min. 31.1 [+4.2] Mean      38.7 [+3.2] 24-hour corrected mean: 37.9
Max. for month: 59F on the 23rd
Min. for month: 25F on the 5th and 20th

HEATING DEGREE DAYS
Total heating units:    812 [-103] Total for the season:  4532 [-815] Total for last season: 4863

COOLING DEGREE DAYS
Total cooling units:      0 [ 000] Total for the season:     0 [ 000] Total for last season:    0

PRECIPITATION, Inches
Total: 5.96 [+0.44] Greatest in 24 hrs: 3.46 on the 13-14th

SNOWFALL, Inches
Total: 10.6 [-4.4] Greatest in 24 hrs: 7.2 on the 14-15th

WIND, mph
Avg. uncorrected wind speed: 12.4 mph
Avg. corrected wind speed:   12.8 mph
Prevailing wind direction:   Northwest [16%] Peak gust and direction:  51 NNE on the 14th

SUNSHINE:
Campbell-Stokes card minutes: 10872 of a possible 21516, or 51%
Astronomical total minutes: 11237 of a possible 22222, or 51%

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Today’s Observations:

7 A.M.
Weather: Overcast altostratus, few stratus fractus all quadrants
Temperature: 41F; Dew Point: 34F; Relative Humidity: 75%
Wind: ENE @ 13G24 kts
Sea-level pressure: 1029.7 mb; 30.41 in. Hg: rising, then more slowly
Visibility: 40 miles, hazy
6-hr Max temp: 45F
6-hr Min temp: 41F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 E35 OVC 40 297/41/34/0713G24/041/ FEW STFRA ALQDS
HAZY/ 8/72/ 51027 10045 20041

10 A.M.
Weather: Scattered stratocumulus, overcast altostratus
Temperature: 40F; Dew Point: 33F; Relative Humidity: 75%
Wind: E @ 15G25 kts, peak wind E 33mph at 8:57 A.M.
Sea-level pressure: 1030.5 mb; 30.43 in. Hg: falling, then rising
Visibility: 25 miles, hazy
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 20 SCT E35 OVC 25 305/40/33/0815G25/043/
HAZY PK WND 0829/57/ 8/52/ 53008

1 P.M.
Weather: Overcast stratocumulus
Temperature: 39F; Dew Point: 32F; Relative Humidity: 74%
Wind: E @ 12G19 kts
Sea-level pressure: 1028.7mb; 30.38 in. Hg: falling, then more slowly
Visibility: 15 miles, hazy
6-hr Max temp: 42F
6-hr Min temp: 39F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 E20 OVC 15 287/39/32/0912G19/038/ HAZY/
8/5// 56018 10042 20039

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SUMMARY FOR TUESDAY, APRIL 4, 2023

TEMPERATURE (DEGREES F)
MAX…….62   NORMAL…..51
MIN…….40   NORMAL…..33
MEAN……51   NORMAL…..42

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+9
TOTAL DEPARTURE FOR THE MONTH…………………+15 [+3.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………14  DEPARTURE……..-9
TOTAL HEATING UNITS FOR THE MONTH……………79  DEPARTURE…….-15
TOTAL HEATING UNITS FOR THE SEASON…………4611  DEPARTURE……-830
TOTAL HEATING UNITS LAST SEASON TO DATE…….4944  DEPARTURE……-333

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.

F420C (Official)………..26 ENE @  4:11 P.M.
VECTOR #1 (1-Sec)……….26 ENE @  4:48 P.M.
VECTOR #2 (1-Sec)……….29 ENE @  4:11 P.M.
DAVIS #1……………….28 E   @  5:05 P.M.
DAVIS #2 ………………26 ENE @  4:11 P.M.
RMY #1 (Instantaneous)…..27 ENE @  4:11 P.M.
RMY #2 (Instantaneous)…..29 ENE @  4:11 P.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……26     @  5:05 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 E   @  5:07 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17     @  5:07 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20     @  4:19 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 E   @  5:07 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 E   @  4:19 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 E   @  5:07 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 ENE @  4:19 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………19     @  5:07 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….8.9 ENE [214 total miles] VECTOR #1……………..8.7
VECTOR #2……………..9.5
DAVIS #1………………9.3 E
DAVIS #2………………9.5 E
RMY #1………………..9.0 E
RMY #2………………..9.4 E
RICHARDS (C5C)…………9.4

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH…………..0.39 DEPARTURE…..-0.28
TOTAL PRECIPITATION FOR THE YEAR…………..15.00 DEPARTURE…..+0.31

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.2
TOTAL SNOWFALL FOR THE MONTH………………..0.0 DEPARTURE……-0.8
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-32.8

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PRELIMINARY CLIMATE SUMMARY FOR MARCH CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
VEC1: Vector #1 1-second gust
RMY:  R.M. Young wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

3/1   43/27/35/+4/0.00/0.0/425/63         20 NW   VEC1 21 SE  RMY 21
3/2   40/34/37/+5/0.31/0.0/000/00         35 NW   VEC1 36 NW  RMY 39
3/3   44/29/37/+5/0.01/0.1/462/68         33 NW   VEC1 34 NW  RMY 36
3/4   33/28/31/-1/0.82/3.3/000/00         48 E    VEC1 49 NE  RMY 52
3/5   41/25/33/+1/0.00/0.0/240/35         35 NW   VEC1 36 NW  RMY 37
3/6   46/31/39/+6/0.00/0.0/571/83         46 WNW  VEC1 48 NW  RMY 51
3/7   38/26/32/-1/T/T/387/56              41 NW   VEC1 42 NW  RMY 46
3/8   44/26/35/+2/T/T/194/28              32 N    VEC1 34 N   RMY 34
3/9   47/32/40/+7/0.00/0.0/473/68         28 NW   VEC1 28 NW  RMY 29
3/10  49/27/38/+4/T/0.0/616/88            18 W    VEC1 18 SE  RMY 17
3/11  36/29/33/-1/0.14/T/000/00           32 NE   VEC1 34 NE  RMY 34
3/12  41/28/35/+1/0.00/0.0/571/81         26 NNE  VEC1 26 NNE RMY 27
3/13  41/32/37/+3/0.52/0.0/000/00         29 E    VEC1 31 E   RMY 33
3/14  39/31/35/0/3.18/6.9/000/00          51 NNE  VEC1 52 NNE RMY 55
3/15  39/30/35/0/0.00/0.0/342/48          46 NNW  VEC1 49 NNW RMY 53
3/16  49/29/39/+4/0.00/0.0/445/62         30 NW   VEC1 31 NW  RMY 34
3/17  52/37/45/+9/T/0.0/036/05            32 S    VEC1 36 S   RMY 36
3/18  52/36/44/+8/0.01/0.0/376/52         30 WNW  VEC1 31 WNW RMY 31
3/19  38/26/32/-4/0.00/0.0/682/94         47 WNW  VEC1 46 WNW RMY 46
3/20  51/25/38/+1/0.00/0.0/706/97         32 WSW  VEC1 34 WSW RMY 35
3/21  58/32/45/+8/0.00/0.0/636/87         33 WNW  VEC1 35 WNW RMY 36
3/22  55/38/47/+10/T/0.0/617/84           24 SSW  VEC1 25 SSW RMY 26
3/23  59/45/52/+14/0.01/0.0/044/06        35 SSW  VEC1 36 SSW RMY 37
3/24  52/36/44/+6/0.00/0.0/311/42         32 WNW  VEC1 33 WNW RMY 33
3/25 39/33/36/-2/0.17/T/015/02 35 ESE  VEC1 38 ESE RMY 37
3/26  57/39/48/+9/T/0.00/597/80           41 WNW  VEC1 44 WNW RMY 46
3/27  58/35/47/+8/0.41/0.0/516/69         18 E    VEC1 21 E   RMY 20
3/28  44/35/40/+1/0.24/T/090/12           17 NW   VEC1 17 NW  RMY 18
3/29  52/29/41/+1/0.00/0.0/725/96         29 SSW  VEC1 31 SSW RMY 31
3/30  41/27/34/-6/T/T/734/97              39 WNW  VEC1 41 WNW RMY 43
3/31  52/26/39/-2/0.11/T/426/56           33 SW   VEC1 35 SW  RMY 38

PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
VEC1: Vector #1 1-second gust
RMY:  R.M. Young wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

4/1   60/39/50/+9/0.39/0.0/145/19         36 SW   VEC1 40 SW  RMY 41
4/2   50/30/40/-1/0.00/0.0/636/83         40 NNW  VEC1 44 NNW RMY 45
4/3   51/28/40/-2/0.00/0.0/737/96         41 SSW  VEC1 46 SSW RMY 46
4/4   62/40/51/+9/0.00/0.0/594/77         26 ENE  VEC1 26 ENE RMY 27

4/5  The low since midnight is 39F, the daily normal low is 34F

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

RECORDS FOR APRIL 5
HIGH 81 IN 1928
LOW 15 IN 1995
PRECIP 2.15 IN. IN 1987
SNOWFALL 4.0 IN. IN 1898
PEAK GUST 76 MPH WNW IN 1963

RECORDS FOR APRIL 6
HIGH 82 IN 1921
LOW 16 IN 1982
PRE 1.72 INS IN 1886
SNOW 12.3 INS IN 1982
WIND 71e MPH WNW IN 1940

TODAY’S REPORT PREPARED BY: Matt Douglas