Thursday, March 30, 2023

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

THURSDAY, MARCH 30, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0531E
SUNSET:  1808E

CLEAR SKIES, BUT WINDY AND COLD AS WE NEAR THE END OF MARCH…

Skies have been clear all day with only a few stratocumulus
floating by at times during the morning hours. An arctic
air mass rushed into the region overnight following the
passage of a cold front. The dew point has dipped into the
single digits early this afternoon!

Temperatures started the day off in the mid to upper 20s,
and had only rebounded to the upper 30s early this afternoon.
This is of course about 10 degrees below the expected high
for today’s date.

The wind has been quite busy with the average speed around
17mph to this point. Frequent gusts over 30mph has been
occurring all day. As such wind chills have been in the
upper 20s to the low 30s.

Visibility has been excellent with views of 70-80 miles today.

The high temperature so far today is 39F, which is 10 degrees
below the normal maximum temperature for today of 49F. The low
since midnight so far is 27F, which is 4 degrees below our
normal minimum temperature of 31F.

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Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus distant WSW-NW-NE-E, few cirrus
distant E-SE
Temperature: 29F; Dew Point: 10F; Relative Humidity: 45%
Wind: WNW @ 15G28 kts, peak wind WNW 32mph at 6:52 A.M.
Sea-level pressure: 1020.6 mb; 30.14 in. Hg: rising, then more rapidly
Visibility: 70 miles
6-hr Max temp: 37F
6-hr Min temp: 27F
24-hr Precip: Trace
24-hr Snowfall: Trace
Snow Depth: 0 ins.
BHO SA 1155 CLR 70 206/29/10/3015G28/014/ FEW SC DSNT
WSW-NW-NE-E FEW CI DSNT E-SE PK WND 3028/52/ 8/501 53037
6000/ 70000 10037 20027

10 A.M.
Weather: Clear, few stratocumulus all quadrant
Temperature: 35F; Dew Point: 11F; Relative Humidity: 36%
Wind: NW @ 12G18 kts, peak wind NW 21mph at 9:33 A.M.
Sea-level pressure: 1022.3 mb; 30.19 in. Hg: rising, then more rapidly
Visibility: 80 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 CLR 80 223/35/11/3212G18/019/ FEW SC ALQDS
PK WND 3226/33/ 8/500 53017

1 P.M.
Weather: Clear, few stratocumulus distant S-W-N
Temperature: 38F; Dew Point: 7F; Relative Humidity: 27%
Wind: NW @ 13G24 kts, peak wind WNW 32mph at 12:12 P.M.
Sea-level pressure: 1022.4mb; 30.19 in. Hg: rising, then steady
Visibility: 80 miles
6-hr Max temp: 39F
6-hr Min temp: 29F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 CLR 80 224/38/7/3113G24/019/ FEW SC DSNT S-W-N
PK WND 3028/12/ 8/500 51001 10039 20029

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SUMMARY FOR WEDNESDAY, MARCH 29, 2023

TEMPERATURE (DEGREES F)
MAX…….52   NORMAL…..48
MIN…….29   NORMAL…..31
MEAN……41   NORMAL…..40

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+1
TOTAL DEPARTURE FOR THE MONTH………………..+108 [+3.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………24  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH…………..755  DEPARTURE……-110
TOTAL HEATING UNITS FOR THE SEASON…………4475  DEPARTURE……-822
TOTAL HEATING UNITS LAST SEASON TO DATE…….4819  DEPARTURE……-344

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,3
420C, Contacting, Merlin and Richards are all Main Tower.

420C (Official)…………29 SSW @  10:34 P.M.
VECTOR #1 (1-Sec)……….31 SSW @  11:04 P.M.
VECTOR #2 (1-Sec)……….29 SSW @  10:28 P.M.
DAVIS #1……………….32 S   @  10:25 P.M.
DAVIS #2 ………………33 S   @   6:02 P.M.
RMY #1 (Instantaneous)…..31 SSW @  10:34 P.M.
RMY #2 (Instantaneous)…..30 SSW @  11:38 P.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……31     @  10:34 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………23 SSW @  11:54 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..23     @  11:05 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23     @  11:06 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………23 S   @  11:06 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………25 S   @   5:36 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..23 SSW @  11:05 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 SSW @  11:06 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………23     @  11:05 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……. 9.6 N [230 total miles] VECTOR #1…………….. 9.9
VECTOR #2……………..10.2
DAVIS #1……………… 9.6 WSW
DAVIS #2………………10.2 SW
RMY #1……………….. 9.7 WNW
RMY #2………………..10.2 WNW
RICHARDS (C5C)…………10.1

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH…………..5.85 DEPARTURE…..+0.67
TOTAL PRECIPITATION FOR THE YEAR…………..14.50 DEPARTURE…..+0.82

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………TRACE DEPARTURE……-0.3
TOTAL SNOWFALL FOR THE MONTH……………….10.6 DEPARTURE……-4.0
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-31.6

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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  39/30/35/0/0.00/0.0/342/48          46 NNW  VEC1 49 NNW RMY 53
3/16  49/29/39/+4/0.00/0.0/445/62         30 NW   VEC1 31 NW  RMY 34
3/17  52/37/45/+9/T/0.0/036/05            32 S    VEC1 36 S   RMY 36
3/18  52/36/44/+8/0.01/0.0/376/52         30 WNW  VEC1 31 WNW RMY 31
3/19  38/26/32/-4/0.00/0.0/682/94         47 WNW  VEC1 46 WNW RMY 46
3/20  51/25/38/+1/0.00/0.0/706/97         32 WSW  VEC1 34 WSW RMY 35
3/21  58/32/45/+8/0.00/0.0/636/87         33 WNW  VEC1 35 WNW RMY 36
3/22  55/38/47/+10/T/0.0/617/84           24 SSW  VEC1 25 SSW RMY 26
3/23  59/45/52/+14/0.01/0.0/044/06        35 SSW  VEC1 36 SSW RMY 37
3/24  52/36/44/+6/0.00/0.0/311/42         32 WNW  VEC1 33 WNW RMY 33
3/25 39/33/36/-2/0.17/T/015/02 35 ESE  VEC1 38 ESE RMY 37
3/26  57/39/48/+9/T/0.00/597/80           41 WNW  VEC1 44 WNW RMY 46
3/27  58/35/47/+8/0.41/0.0/516/69         18 E    VEC1 21 E   RMY 20
3/28  44/35/40/+1/0.24/T/090/12           17 NW   VEC1 17 NW  RMY 18
3/29  52/29/41/+1/0.00/0.0/…/..         29 SSW  VEC1 31 SSW RMY 31

3/30  The low since midnight is 27F, the daily normal low is 31F

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

RECORDS FOR MARCH 30
HIGH 83 IN 1977
LOW 10 IN 1887
PRECIP 2.92 INS. IN 2010
SNOWFALL 3.9 INS. IN 1957
PEAK GUST 60 MPH NW IN 1999

RECORDS FOR MARCH 31
HIGH 89 IN 1998  [RECORD HIGH FOR MONTH] LOW 16 IN 1923
PRECIP 2.89 IN 1987
SNOWFALL 15.0 IN 1997
PEAK GUST 81 MPH SSE IN 1987

TODAY’S REPORT PREPARED BY: Matt Douglas