Tuesday, February 21, 2023

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

TUESDAY, FEBRUARY 21, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0632E
SUNSET:  1724E

A TOUCH OF SNOW THIS MORNING; OVERCAST, RAW, AND CHILLY….

A period of snow moved through this morning, starting as a
bit of rain. Snow accumulated to 0.5″ by the 7am observation,
with an additional 0.9″ fell between 7am and 10am. By far
the biggest snow event of the month (which isn’t saying much).
As a matter of fact, this was the biggest precipitation
event of the month with 0.18″ of liquid being measured for
the event thus far.

The wind has been light out of the northeast, then east.
The average speed for the day so far is around 8mph. The peak
gust so far is only 18mph.

Visibility has been limited all day due to fog. It was only
around 1/8th of a mile this morning, but has improved to
around 20 miles early this afternoon in thin fog.

The high so far today is 36F, which is 2 degrees below the
normal maximum of 38F. The low since midnight is 31F, which
is 10 degrees above the normal low of 21F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 200ft, light snow
Temperature: 32F; Dew Point: 32F; Relative Humidity: 100%
Wind: NNE @ 4 kts, wind light
Sea-level pressure: 1005.4 mb; 29.69 in. Hg: falling, then rising
Visibility: 1/8 mile, fog
6-hr Max temp: 40F
6-hr Min temp: 32F
24-hr Precip:  0.07 ins.
24-hr Snowfall: 0.5 ins.
Snow Depth: 1 ins.
BHO SA 1155 X W2 1/8S-F 054/32/32/0304/969/ WND LGT
NEW SNW PST 24 HRS 0.5 INS/ 8//// 4/001 55004 6007/
70007 10040 20032

10 A.M.
Weather: Sky obscured, vertical visibility 200ft, very light snow
Temperature: 32F; Dew Point: 32F; Relative Humidity: 100%
Wind: ENE @ 7 kts
Sea-level pressure: 1005.2mb; 29.68 in. Hg: falling, then rising
Visibility: 1/8 mile, fog
3-hr Precip:  0.11 ins.
3-hr Snowfall: 0.9 ins.
BHO SA 1455 X W2 1/8S-F 052/32/32/0707/968/ PCPN VRY LGT
NEW SNW PST 3 HRS 0.9 INS/ 8//// 55002 6011/

1 P.M.
Weather: Overcast stratus, very light rain
Temperature: 36F; Dew Point: 34F; Relative Humidity: 93%
Wind: E @ 4 kts, wind light
Sea-level pressure: 1003.3 mb; 29.63 in. Hg: falling, then rising
Visibility: 20 miles, thin fog
6-hr Max temp: 36F
6-hr Min temp: 31F
6-hr Precip:  0.11 ins.
6-hr Snowfall: 0.9 ins.
Snow Depth: 1 ins.
BHO SA 1755 E6 OVC 20R- 033/36/34/1004/963/ THN F ALQDS R-B54
PCPN VRY LGT WND LGT NEW SNW PST 6 HRS 0.9 INS/ 8/6// 4/001 55019 6011/
10036 20031

————————————————————–

SUMMARY FOR MONDAY, FEBRUARY 20, 2023

TEMPERATURE (DEGREES F)
MAX…….59   NORMAL…..38
MIN…….41   NORMAL…..20
MEAN……50   NORMAL…..29

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……..+21
TOTAL DEPARTURE FOR THE MONTH……………….+150 [+7.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………15  DEPARTURE…….-21
TOTAL HEATING UNITS FOR THE MONTH…………..601  DEPARTURE……-150
TOTAL HEATING UNITS FOR THE SEASON…………3424  DEPARTURE……-730
TOTAL HEATING UNITS LAST SEASON TO DATE…….3816  DEPARTURE……-392

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
420C, Contacting, Merlin and Richards are all Main Tower.

420C (Official)…………35 W   @  1:59 P.M.
VECTOR #1 (1-Sec)……….36 W   @  1:48 P.M.
VECTOR #2 (1-Sec)……….39     @  1:47 P.M.
DAVIS #1……………….35 W   @  1:48 P.M.
DAVIS #2 ………………40 W   @  1:48 P.M.
RMY #1 (Instantaneous)…..M
RMY #2 (Instantaneous)…..40 W   @  1:47 P.M.
MERLIN…………………35 W
RICHARDS (C5C) (Inst)……35     @  1:48 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………26 W   @  2:01 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..27     @  1:49 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..27     @  1:49 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………28 W   @  1:49 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………28 W   @  1:49 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..M
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..27 W   @  1:49 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………25     @  1:49 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……12.5 SW [300 total miles] VECTOR #1…………….M
VECTOR #2…………….13.0
DAVIS #1……………..12.3 W
DAVIS #2……………..12.9 W
RMY #1……………….M
RMY #2……………….12.9 W
RICHARDS (C5C)………..M

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.07 DEPARTURE…..-0.08
TOTAL PRECIPITATION FOR THE MONTH…………..0.14 DEPARTURE…..-2.62
TOTAL PRECIPITATION FOR THE YEAR……………6.93 DEPARTURE…..-0.33

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.5 DEPARTURE……-0.2
TOTAL SNOWFALL FOR THE MONTH………………..0.7 DEPARTURE…..-12.5
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……15.6 DEPARTURE…..-31.3

————————————————————–

PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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

2/1   30/18/24/-2/T/T/552/92              17 NW   VEC1 N/A    RMY 20
2/2   38/19/29/+3/0.00/0.0/518/86         25 SW   VEC1 N/A    RMY 29
2/3   28/-11/9/-17/T/T/557/92             56 WNW  VEC1 N/A    RMY 64
2/4   14/-14/0/-26/0.00/0.0/473/78        45 NW   VEC1 N/A    RMY 51
2/5   49/14/32/+5/0.00/0.0/359/59         38 SW   VEC1 N/A    RMY 43
2/6   47/30/39/+12/0.00/0.0/025/04        28 NE   VEC1 N/A    RMY 29
2/7   31/22/27/0/0.01/0.1/461/75          29 SSW  VEC1 N/A    RMY 33
2/8   46/31/39/+12/0.00/0.0/413/67        30 NW   VEC1 N/A    RMY 34
2/9   49/33/41/+14/T/0.0/149/24           31 SSE  VEC1 N/A    RMY 32
2/10  60/31/46/+19/0.00/0.0/603/97        43 W    VEC1 N/A    RMY 51
2/11  43/31/37/+10/0.00/0.0/625/100       41 WNW  VEC1 N/A    RMY 46
2/12  48/28/38/+10/0.00/0.0/339/54        22 SW   VEC1 N/A    RMY 24
2/13  42/33/38/+10/0.00/0.0/069/11        28 NE   VEC1 N/A    RMY 36
2/14  50/34/42/+14/0.00/0.0/…/..        30 NW   VEC1 33     RMY 35
2/15  56/35/46/+18/0.00/0.0/…/..        39 SSW  VEC1 44     RMY 49
2/16  61/50/56/+28/T/0.0/…/..           29 W    VEC1 31     RMY 34
2/17  56/23/40/+11/0.06/0.1/…/..        44 NNW  VEC1 46     RMY 46
2/18  39/19/29/0/0.00/0.0/…/..          41 NW   VEC1 42     RMY 47
2/19  44/30/37/+8/0.00/0.0/…/..         32 S    VEC1 35     RMY 36
2/20  59/41/50/+21/0.00/0.0/…/..        35 W    VEC1 36     RMY 40

2/21  The low since midnight is 31F, the daily normal low is 21F

DAILY RECORDS

02/03/2023: NEW RECORD MINIMUM TEMPERATURE OF -11F,
THIS BEATS THE OLD RECORD OF -7F SET IN 1955

02/04/2023: NEW RECORD MINIMUM TEMPERATURE OF -14F,
THIS BEATS THE OLD RECORD OF -4F SET IN 1886 AND 1908

02/10/2023: NEW RECORD MAXIMUM TEMPERATURE OF 60F,
THIS BEATS THE OLD RECORD OF 56F SET IN 1909

02/16/2023: NEW RECORD HIGH MINIMUM TEMPERATURE OF 50F,
THIS BEATS THE OLD RECORD OF 41F SET IN 1976. THIS ALSO
TIES THE WARMEST MINIMUM TEMPERATURE FOR FEBRUARY SET
IN 2018

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

RECORDS FOR FEBRUARY 21
HIGH 70F IN 2018
LOW -6F IN 1950
PRECIP 2.42 INCHES IN 1898
SNOWFALL 9.0 INCHES IN 1929
PEAK GUST 72 MPH WNW IN 1967

RECORDS FOR FEBRUARY 22
HIGH 63F IN 1997
LOW -1F IN 1918
PRECIP 1.38 INCHES IN 1900
SNOWFALL 8.0 INCHES IN 1893
PEAK GUST 74 MPH S IN 1974

TODAY’S REPORT PREPARED BY: Matt Douglas