Sunday, February 18, 2024

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

SUNDAY, FEBRUARY 18, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0637E
SUNSET:  1720E

DECREASING VISIBILITY WITH A NOTABLE SOUTHWESTERLY BREEZE….

We observed a decrease in visibility from 85 miles this morning
to 70 miles by the 1 PM observation. Wind has been strong out of
the southwest with an average speed of 18 mph and a max speed of
39 mph so far today. Today featured partly cloudy skies with a
temperature increase of 15 degrees since this morning.

The maximum temperature so far today is 34F degrees, which is 4
degrees below the normal high of 38F. The minimum temperature
since midnight is 17F degrees, which is 3 degrees below the normal
low of 20F.

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Today’s Observations:

7 A.M.
Weather: Scattered cirrostratus, few stratocumulus distant offshore NE-E-ESE
Temperature: 19F; Dew Point: 10F; Relative Humidity: 58%
Wind: SW @ 9G16 kts
Sea-level pressure: 1011.6 mb; 29.87 in. Hg: rising unsteadily
Visibility: 85 miles
6-hr Max temp: 21F
6-hr Min temp: 17F
24-hr Precip: Trace
24-hr Snowfall: Trace
Snow Depth: 3 inches
BHO SA 1155 250 SCT 85 116/19/10/2209G16/987/ FEW SC DSNT OFFSHR NE-E-ESE
NEW SNW PST 24 HRS TRACE/ 8/509 4/003 52002 10021 20017

10 A.M.
Weather: Scattered altocumulus, broken cirrostratus, few stratocumulus
Temperature: 27F; Dew Point: 12F; Relative Humidity: 52%
Wind: SW @ 16G26 kts, peak of 39 mph SW at 9:44 A.M.
Sea-level pressure: 1009.8 mb; 29.82 in. Hg: falling unsteadily
Visibility: 75 miles
3-hr Precip:  0.00 ins
3-hr Snowfall: 0.0 ins
BHO SA 1455 110 SCT 250 BKN 75 098/27/12/2116G26/982/ FEW SC ALQDS PK WND
2134/44/ 8/578 57018

1 P.M.
Weather: Scattered cirrostratus, few stratocumulus
Temperature: 33F; Dew Point: 16F; Relative Humidity: 49%
Wind: WSW @ 13G20 kts, peak of 34 mph WSW at 12:26 P.M.
Sea-level pressure: 1006.5 mb; 29.73 in. Hg: falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 34F
6-hr Min temp: 18F
6-hr Precip:  0.00 ins
6-hr Snowfall: 0.0 ins
Snow Depth: 3 inches
BHO SA 1755 250 SCT 70 065/33/16/2413G20/973/ FEW SC ALQDS PK WND 2429/26/
8/508 4/003 58033 10034 20018

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SUMMARY FOR SATURDAY, FEBRUARY 17, 2024

TEMPERATURE (DEGREES F)
MAX…….33   NORMAL…..37
MIN…….21   NORMAL…..20
MEAN……27   NORMAL…..29

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………-2
TOTAL DEPARTURE FOR THE MONTH………………….+107 [+6.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………38  DEPARTURE……..+2
TOTAL HEATING UNITS FOR THE MONTH…………..436  DEPARTURE……-107
TOTAL HEATING UNITS FOR THE SEASON…………3502  DEPARTURE……-544
TOTAL HEATING UNITS LAST SEASON TO DATE…….3345  DEPARTURE……+157

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)……….E36 WNW  @  04:18 P.M.
VECTOR #1 (1-Sec)……….38 WNW  @  09:51 P.M.
VECTOR #2 (1-Sec)……….40 WNW  @  09:50 P.M.
DAVIS #1……………….36 W    @  09:50 P.M.
DAVIS #2 ………………38 WNW  @  09:50 P.M.
RMY #1 (Instantaneous)…..38 WNW  @  09:05 P.M.
RMY #2 (Instantaneous)…..39 WNW  @  09:50 P.M.
MERLIN…………………33 W
RICHARDS (C5C) (Inst)……37      @  10:35 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………25 WNW  @  09:51 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..25      @  09:52 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..28      @  09:51 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………27 W    @  09:51 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………28 WNW  @  09:52 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..24 WNW  @  09:52 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..27 WNW  @  09:51 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………26      @  09:52 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……8.2 WNW [196 total miles] VECTOR #1…………….8.3
VECTOR #2…………….9.1
DAVIS #1……………..8.3 W
DAVIS #2……………..8.6 WNW
RMY #1……………….8.0 W
RMY #2……………….8.8 W
RICHARDS (C5C)………..8.8

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.15
TOTAL PRECIPITATION FOR THE MONTH…………..0.73 DEPARTURE…..-1.58
TOTAL PRECIPITATION FOR THE YEAR (2024)……..9.97 DEPARTURE…..+3.16

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………TRACE DEPARTURE……-0.6
TOTAL SNOWFALL FOR THE MONTH………………..4.7 DEPARTURE……-6.5
TOTAL SNOWFALL FOR THE SEASON (2023-2024)……25.6 DEPARTURE…..-19.3

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PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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

2/1   40/30/35/+9/0.00/0.0/012/02         25 SW  VEC1 24 SW  RMY 26
2/2   39/31/35/+9/0.03/T/000/00           23 N   VEC1 24 N   RMY 25
2/3   35/26/31/+5/0.00/0.0/338/56         26 N   VEC1 26 NNW RMY 28
2/4   39/20/30/+4/0.00/0.0/607/100        28 NNW VEC1 28 NNW RMY 27
2/5   39/22/31/+4/0.00/0.0/597/98         29 N   VEC1 29 N   RMY 30
2/6   35/26/31/+4/0.00/0.0/251/41         26 N   VEC1 26 N   RMY 26
2/7   39/26/33/+6/0.00/0.0/436/71         21 NE  VEC1 21 NE  RMY 24
2/8   44/29/37/+10/0.00/0.0/457/74        16 S   VEC1 16 S   RMY 16
2/9   47/30/39/+12/0.00/0.0/229/37        31 SSW VEC1 31 SSW RMY 31
2/10  58/35/47/+20/0.02/0.0/385/62        26 NW  VEC1 26 NW  RMY 30
2/11  45/34/40/+13/0.00/0.0/119/19        30 NW  VEC1 30 NW  RMY 31
2/12  47/29/38/+10/0.00/0.0/470/75        21 N   VEC1 20 N   RMY 20
2/13  35/25/30/+2/0.65/4.3/000/00         40 NNE VEC1 41 NNE RMY M
2/14  29/21/25/-3/0.00/0.0/562/89         53 NW  VEC1 53 NW  RMY 54
2/15  38/18/28/0/0.03/0.4/…/..          37 SW  VEC1 36 SW  RMY 37
2/16  37/26/32/+4/0.00/0.0/…/..         50 WNW VEC1 47 WNW RMY 51
2/17  33/21/27/-2/T/T/…/..              36 WNW VEC1 38 WNW RMY 38

2/18 The low since midnight is 17F, the daily normal low is 20F

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FEBRUARY 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 FEBRUARY 18
HIGH 65F IN 1981
LOW -10F IN 1958
PRECIP 1.97 INCHES IN 1887, IN 1952
SNOWFALL 9.2 INCHES IN 1952
PEAK GUST 70 MPH S IN 2008

RECORDS FOR FEBRUARY 19
HIGH 66F IN 1981
LOW -5F IN 1923
PRECIP 2.73 INCHES IN 1972
SNOWFALL 8.9 INCHES IN 1964
PEAK GUST 72 MPH NW IN 1968

TODAY’S REPORT PREPARED BY: Benjamin Turner