Friday, April 21, 2023

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

FRIDAY, APRIL 21, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0454E
SUNSET:  1832E

SUNNY AFTERNOON WITH BELOW SEASONABLE TEMPERATURES…

This morning the sky was overcast and a few showers were
observed in the region, missing Great Blue Hill. The cloud
cover began to dissipate throughout the day with clear
skies and full sunshine by the 1:00 P.M. observation.

Wind speed continued to be light and variable overnight but
slightly picked up around 3 A.M. this morning. For most of
the day a cool sea-breeze from the east-northeast has caused
temperatures to be below normal with a high so far of 54F,
this is 5 degrees below the normal temperature of 59F.

Visibility has been good for most of the day allowing for
60-65 miles of visibility into the Monadnock region of NH.

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Today’s Observations:

7 A.M.
Weather: Broken stratocumulus, broken altocumulus, few cumulus S-NNW
Temperature: 43F; Dew Point: 38F; Relative Humidity: 82%
Wind: E @ 8G14 kts
Sea-level pressure: 1023.1 mb; 30.21 in. Hg: rising steadily
Visibility: 60 miles
6-hr Max temp: 44F
6-hr Min temp: 42F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 E15 BKN 110 BKN 60 231/43/38/0808G14/021/ FEW CU S-NNW/
8/55/ 52006 10044 20042

10 A.M.
Weather: Scattered altocumulus, scattered cirrus, few stratocumulus
distant in all quadrants
Temperature: 51F; Dew Point: 39F; Relative Humidity: 64%
Wind: E @ 10G14 kts
Sea-level pressure: 1022.5 mb; 30.19 in. Hg: falling unsteadily
Visibility: 65 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 140 SCT 250 SCT 65 225/51/39/0910G14/019/ FEW SC DSNT ALQDS/
8/551 57006

1 P.M.
Weather: Clear, few stratocumulus distant NE-SSE, Few cirrus SSW-W
Temperature: 53F; Dew Point: 39F; Relative Humidity: 59%
Wind: ENE @ 13G16 kts
Sea-level pressure: 1021.4 mb; 30.16 in. Hg: falling, then more rapidly
Visibility: 60 miles
6-hr Max temp: 54F
6-hr Min temp: 43F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 CLR 60 214/53/39/0613G16/016/ FEW SC DSNT NE-SSE FEW CI
SSW-W/ 8/501 58011 10054 20043

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SUMMARY FOR THURSDAY, APRIL 20, 2023

TEMPERATURE (DEGREES F)
MAX…….64   NORMAL…..59
MIN…….36   NORMAL…..40
MEAN……50   NORMAL…..49

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………+1
TOTAL DEPARTURE FOR THE MONTH……………….+117 [+5.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………15  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH…………..291  DEPARTURE……-110
TOTAL HEATING UNITS FOR THE SEASON…………4823  DEPARTURE……-925
TOTAL HEATING UNITS LAST SEASON TO DATE…….5199  DEPARTURE……-376

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………….9  DEPARTURE……..+8
TOTAL COOLING UNITS FOR THE SEASON……………9  DEPARTURE……..+8
TOTAL COOLING UNITS LAST SEASON TO DATE……….0  DEPARTURE……..+9

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

F420C (Official)………..23 NW  @ 7:02 A.M.
VECTOR #1 (1-Sec)……….23 NNW @ 7:01 A.M.
VECTOR #2 (1-Sec)……….25 NNW @ 7:02 A.M.
DAVIS #1……………….22 NW  @ 7:01 A.M.
DAVIS #2 ………………22 NNW @ 7:02 A.M.
RMY #1 (Instantaneous)…..23 NNW @ 7:08 A.M.
RMY #2 (Instantaneous)…..25 NNW @ 7:02 A.M.
MERLIN…………………24 NW
RICHARDS (C5C) (Inst)……23     @ 7:01 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 NW  @ 7:03 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18     @ 7:02 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18     @ 7:03 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 NW  @ 7:03 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 NNW @ 7:03 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 NW  @ 7:02 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..17 NW  @ 7:03 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18     @ 7:02 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.7 NW [208 total miles] VECTOR #1……………….8.9
VECTOR #2……………….9.4
DAVIS #1………………..8.9 WNW
DAVIS #2………………..9.2 NW
RMY #1………………….8.6 WNW
RMY #2………………….9.3 WNW
RICHARDS (C5C)…………..9.4

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH…………..0.54 DEPARTURE…..-2.78
TOTAL PRECIPITATION FOR THE YEAR…………..15.15 DEPARTURE…..-2.19

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……-2.6
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-34.6

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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

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   45/37/41/-2/0.02/0.0/000/00         33 ENE  VEC1 34 ENE RMY 37
4/6   62/37/50/+7/0.02/0.0/155/20         26 NW   VEC1 28 NNW RMY 29
4/7   58/36/47/+3/0.00/0.0/328/42         45 WNW  VEC1 48 WNW RMY 52
4/8   50/29/40/-4/0.00/0.0/767/98         26 NNW  VEC1 29 NNW RMY 31
4/9   54/33/44/0/0.00/0.0/770/98          25 S    VEC1 28 S   RMY 28
4/10  65/33/49/+4/0.00/0.0/772/98         18 WSW  VEC1 19 NW  RMY 20
4/11  75/45/60/+15/0.00/0.0/522/66        37 W    VEC1 37 W   RMY 38
4/12  73/56/65/+19/0.00/0.0/515/65        46 NW   VEC1 49 NW  RMY 52
4/13  88/52/70/+24/0.00/0.0/764/96        25 W    VEC1 26 WNW RMY 27
4/14  88/50/69/+22/0.00/0.0/711/89        24 WNW  VEC1 27 WNW RMY 26
4/15  68/45/57/+10/T/0.0/401/50           20 ENE  VEC1 20 ENE RMY 21
4/16  55/46/51/+4/0.05/0.0/000/00         21 NE   VEC1 22 NE  RMY 21
4/17  55/45/50/+2/0.06/0.0/000/00         17 NE   VEC1 18 ENE RMY 18
4/18  57/45/51/+3/T/0.0/…/..            39 WSW  VEC1 41 WSW RMY 42
4/19  49/37/43/-6/0.00/0.0/…/..         35 WNW  VEC1 36 WNW RMY 40
4/20  64/36/50/+1/0.00/0.0/…/..         23 NW   VEC1 23 NNW RMY 23

4/21  The low since midnight is 42F, the daily normal low is 40F

DAILY RECORDS

04/12/2023: NEW RECORD HIGH MINIMUM TEMPERATURE OF 56F,
THIS BEATS THE OLD RECORD OF 52F SET IN 1945 AND 1947

04/13/2023: NEW RECORD HIGH MAXIMUM TEMPERATURE OF 88F,
THIS BEATS THE OLD RECORD OF 85F SET IN 1945

04/14/2023: NEW RECORD HIGH MAXIMUM TEMPERATURE OF 88F,
THIS BEATS THE OLD RECORD OF 80F SET IN 1945

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

RECORDS FOR APRIL 21
HIGH 85 IN 1923
LOW 22 IN 1908
PRECIP 3.18 IN. IN 1991
SNOWFALL 0.8 IN. IN 1947
PEAK GUST 76e MPH NE IN 1940

RECORDS FOR APRIL 22
HIGH 85 IN 1977, 2001
LOW 26 IN 1981
PRECIP 2.60 IN. IN 2019
SNOWFALL 3.0 IN. IN 1940
PEAK GUST 68e MPH NW IN 1945

TODAY’S REPORT PREPARED BY: Kaitlin Geagan