Tuesday, March 21, 2023

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

TUESDAY, MARCH 21, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0546E
SUNSET:  1757E

MAINLY SUNNY AND EVEN MILDER TODAY ON BLUE HILL….

Sunshine has been the theme today, except for a period this
morning where some thicker high clouds passed through the
area. Either way, it’s been a very nice day with the
temperature rising into the upper 50s this afternoon. This
is solidly 10+ degrees above the normal high for today.

The wind has been pretty steady today out of the west.
The average speed for the day is around 12mph, but as the
temperature warms and the atmosphere is mixing, we’re getting
gusts over 25mph this afternoon.

Visibility has been somewhat limited by hazy conditions, with
views of 40-50 miles being the theme.

The low since midnight is 32F, this is 4 degrees above the
normal low is 28F. The high so far today is 57F, which is
12 degrees above the normal high of 45F.

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Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus/castellanus distant WSW-NW,
few cirrus distant WSW-NW-NNE
Temperature: 36F; Dew Point: 23F; Relative Humidity: 58%
Wind: W @ 13 kts
Sea-level pressure: 1026.4 mb; 30.31 in. Hg: rising, then steady
Visibility: 40 miles, hazy
6-hr Max temp: 36F
6-hr Min temp: 32F
24-hr Precip: 0.00 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 CLR 40 264/36/23/2813/031/ FEW AC/ACC DSNT WSW-NW
FEW CI DSNT WSW-NW-NNE HAZY/ 8/081 51010 10036 20032

10 A.M.
Weather: Broken cirrostratus, thin broken cirrus
Temperature: 47F; Dew Point: 22F; Relative Humidity: 35%
Wind: WSW @ 7 kts
Sea-level pressure: 1027.4 mb; 30.34 in. Hg: steady, then rising
Visibility: 50 miles, hazy
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E200 BKN 250 -BKN 50 274/47/22/2507/034/ HAZY/
8/008 53010

1 P.M.
Weather: Clear, few cumulus distant NNW
Temperature: 56F; Dew Point: 23F; Relative Humidity: 27%
Wind: W @ 13G23 kts
Sea-level pressure: 1025.6mb; 30.29 in. Hg: falling, then more rapidly
Visibility: 50 miles, hazy
6-hr Max temp: 57F
6-hr Min temp: 36F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0.0 ins.
BHO SA 1755 CLR 50 256/56/23/2813G23/029/ FEW CU DSNT NNW
HAZY/ 8/100 58018 10057 20036

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SUMMARY FOR MONDAY, MARCH 20, 2023

TEMPERATURE (DEGREES F)
MAX…….51   NORMAL…..45
MIN…….25   NORMAL…..28
MEAN……38   NORMAL…..37

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+1
TOTAL DEPARTURE FOR THE MONTH…………………+53 [+2.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………27  DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE MONTH…………..570  DEPARTURE…….-54
TOTAL HEATING UNITS FOR THE SEASON…………4290  DEPARTURE……-766
TOTAL HEATING UNITS LAST SEASON TO DATE…….4581  DEPARTURE……-291

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

420C (Official)…………32 WSW @  1:05 P.M.
VECTOR #1 (1-Sec)……….34 WSW @  1:04 P.M.
VECTOR #2 (1-Sec)……….34 WSW @  2:11 P.M.
DAVIS #1……………….32 SW  @  1:04 P.M.
DAVIS #2 ………………32 WSW @  2:11 P.M.
RMY #1 (Instantaneous)…..35 SW  @  1:04 P.M.
RMY #2 (Instantaneous)…..35 W   @  2:07 P.M.
MERLIN…………………32 WSW
RICHARDS (C5C) (Inst)……36     @  1:04 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………23 WSW @  1:05 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22     @  1:05 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22     @  1:05 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………23 SW  @  1:05 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 SW  @  1:05 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..22 WSW @  1:05 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 WSW @  1:05 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………21     @  1:05 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….12.6 WSW [303 total miles] VECTOR #1……………..12.5
VECTOR #2……………..12.9
DAVIS #1………………12.6 WSW
DAVIS #2………………13.0 WSW
RMY #1………………..12.4 WSW
RMY #2………………..12.8 WSW
RICHARDS (C5C)…………12.3

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.19
TOTAL PRECIPITATION FOR THE MONTH…………..5.02 DEPARTURE…..+1.48
TOTAL PRECIPITATION FOR THE YEAR…………..13.67 DEPARTURE…..+1.63

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.5
TOTAL SNOWFALL FOR THE MONTH……………….10.6 DEPARTURE……-0.8
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-28.4

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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/…/..          46 NNW  VEC1 49 NNW RMY 53
3/16  49/29/39/+4/0.00/0.0/…/..         30 NW   VEC1 31 NW  RMY 34
3/17  52/37/45/+9/T/0.0/…/..            32 S    VEC1 36 S   RMY 36
3/18  52/36/44/+8/0.01/0.0/…/..         30 WNW  VEC1 31 WNW RMY 31
3/19  38/26/32/-4/0.00/0.0/…/..         47 WNW  VEC1 46 WNW RMY 46
3/20  51/25/38/+1/0.00/0.0/…/..         32 WSW  VEC1 34 WSW RMY 35

3/21  The low since midnight is 32F, the daily normal low is 28F

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

RECORDS FOR MARCH 21
HIGH 81 IN 1921
LOW 2 IN 1885
PRECIP 2.67 INS. IN 1974
SNOWFALL 10.6 INS. IN 1958
PEAK GUST 72 MPH NE IN 1958

RECORDS FOR MARCH 22
HIGH 81 IN 2012
LOW 3 IN 1885
PRE 3.48 INS. IN 2001
SNOW 8.7 INS. 1967
WIND 84e MPH E IN 1977

TODAY’S REPORT PREPARED BY: Matt Douglas