Saturday, April 22, 2023

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

SATURDAY, APRIL 22, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0453E
SUNSET:  1833E

CLOUDY DAY WITH DECREASING VISIBILITY…

This morning started with fair visibility with Wachusett just
barely visible until the early afternoon when it disappeared
behind distant haze. Temperatures rose overnight as wind brought
southeasterly air to the hill. Our high temperature so far
today has been 55F which is 4 degrees below our normal maximum
temperature for the day of 59F, and our low since midnight was 42F,
1 degree higher than our daily normal minimum temperature of 41F.

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Today’s Observations:

7 A.M.
Weather: Overcast stratus
Temperature: 46F; Dew Point: 39F; Relative Humidity: 76%
Wind: E @ 5 kts
Sea-level pressure: 1021.2 mb; 30.16 in. Hg: rising, then more slowly
Visibility: 40 miles
6-hr Max temp: 46F
6-hr Min temp: 43F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 E20 OVC 40 212/46/39/0905/016/ 8/6// 51008 10046 20043

10 A.M.
Weather: Overcast stratus
Temperature: 50F; Dew Point: 39F; Relative Humidity: 65%
Wind: ESE @ 11 kts
Sea-level pressure: 1021.2 mb; 30.16 in. Hg: falling then rising
Visibility: 35 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E20 OVC 35 212/50/39/1211/016/ 8/6// 55000

1 P.M.
Weather: Overcast stratus
Temperature: 52F; Dew Point: 42F; Relative Humidity: 68%
Wind: ESE @ 6 kts
Sea-level pressure: 1020.7 mb; 30.14 in. Hg: falling, then more slowly
Visibility: 20 miles
6-hr Max temp: 53F
6-hr Min temp: 46F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 E20 OVC 20 207/52/42/1106/014/ 8/6// 56005 10053 20046

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SUMMARY FOR FRIDAY, APRIL 21, 2023

TEMPERATURE (DEGREES F)
MAX…….55   NORMAL…..59
MIN…….42   NORMAL…..40
MEAN……49   NORMAL…..50

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………-1
TOTAL DEPARTURE FOR THE MONTH……………….+116 [+5.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………16  DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………..307  DEPARTURE……-110
TOTAL HEATING UNITS FOR THE SEASON…………4839  DEPARTURE……-924
TOTAL HEATING UNITS LAST SEASON TO DATE…….5214  DEPARTURE……-375

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)………..22 E   @ 3:31 P.M.
VECTOR #1 (1-Sec)……….24 SE  @ 7:31 P.M.
VECTOR #2 (1-Sec)……….25 SE  @ 7:27 P.M.
DAVIS #1……………….23 SE  @ 7:24 P.M.
DAVIS #2 ………………23 SE  @ 7:27 P.M.
RMY #1 (Instantaneous)…..24 ENE @ 3:46 P.M.
RMY #2 (Instantaneous)…..25 SE  @ 7:50 P.M.
MERLIN…………………22 ENE
RICHARDS (C5C) (Inst)……22     @ 3:44 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 SE  @ 7:50 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17     @ 7:33 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18     @ 7:50 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 ENE @ 3:16 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 SE  @ 7:51 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 ENE @ 3:48 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 SE  @ 7:50 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………16     @ 7:33 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………10.0 ENE [240 total miles] VECTOR #1……………….9.9
VECTOR #2……………….10.6
DAVIS #1………………..10.4 E
DAVIS #2………………..10.6 E
RMY #1………………….10.0 E
RMY #2………………….10.4 E
RICHARDS (C5C)…………..10.5

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…..-2.92
TOTAL PRECIPITATION FOR THE YEAR…………..15.15 DEPARTURE…..-2.33

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  55/42/49/-1/0.00/0.0/…./..        22 E    VEC1 24 SE  RMY 24

4/22  The low since midnight is 42F, the daily normal low is 41F

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 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

RECORDS FOR APRIL 23
HIGH 85 IN 1908, 2007
LOW 25 IN 1933,1989
PRECIP 1.99 IN. IN 2012
SNOWFALL 0.5 IN. IN 1911, 1956
PEAK GUST 64 MPH WNW IN 1962

TODAY’S REPORT PREPARED BY: Samantha Richard