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

SUNDAY, MARCH 24, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0540E
SUNSET: 1802E

NEAR RECORD RAINFALL YESTERDAY AS STORM BROUGHT SEVERAL HOURS
OF MODERATE TO HEAVY RAIN…

The storm system that brought a bit of icing early yesterday
morning, continued through the day and well into the evening
hours. The system brought plenty of rain and some wind to the
Hill. Rain was heaviest during the late afternoon and early
evening hours when nearly 0.40 to 0.50″ per hour was falling
for a 3 hour period. 2.37″ fell in the 24 hours ending at 7am
this morning. The total rainfall for the event was 2.49″, all
of which fell on yesterday’s calendar day. The record for the
date was 2.52″ set in 2010, so we got very close to tying that
value.

The storm also brought a period of fairly strong winds late
last evening as we got into the cold air advection on the west-
southwest side of the low pressure system. Winds gusted over
40mph for a couple of hours, with a peak gust of 48mph occurring
at 10:41pm!

The weather is much drier and brighter today. A layer of high
clouds has been hanging over the area all day so far filtering
the sun, but all in all it’s not a bad day.

Temperatures started the day in the low-mid 20s, and has only
slowly recovered to the upper 30s by early this afternoon. So
today is yet another day featuring below normal temperatures.
The dew point has been holding in the mid teens, so the air mass
is quite dry and is enhancing the chilly feeling of the air.

Winds have been gusty today, especially early this morning while
the air pressure was rising rather rapidly. The trend however has
been for less wind as the day has progressed. The average speed
for the day so far is around 17mph. The peak gust so far is 38mph,
which occurred just before 12:30am.

Visibility was briefly a perfect 90 miles early this morning, but
settled back to around 70 miles by the mid-late morning hours,
where it remains early this afternoon.

The maximum temperature so far today is 39F degrees, which
is 8 degrees below the normal high of 47F. The minimum temperature
since midnight is 23F degrees, which is 6 degrees below the
normal low of 29F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Broken cirrostratus
Temperature: 24F; Dew Point: 16F; Relative Humidity: 74%
Wind: NNW @ 18G29 kts, peak wind NNW 36mph at 6:04 A.M.
Sea-level pressure: 1019.9 mb; 30.12 in. Hg: rising, then more slowly
Visibility: 90 miles
6-hr Max temp: 29F
6-hr Min temp: 23F
24-hr Precip: 2.37 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 E210 BKN 90 199/24/16/3318G29/012/ PK WND 3331/04/ 8/008
51052 70237 10029 20023

10 A.M.
Weather: Scattered cirrostratus, broken cirrus, few stratocumulus
distant WNW-N
Temperature: 29F; Dew Point: 14F; Relative Humidity: 54%
Wind: NNW @ 12G22 kts
Sea-level pressure: 1024.2 mb; 30.24 in. Hg: rising, then more slowly
Visibility: 70 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 200 SCT E250 BKN 70 242/29/14/3412G22/024/ FEW SC DSNT
WNW-N/ 8/506 51043

1 P.M.
Weather: Thin broken cirrus, few stratocumulus distant W-N
Temperature: 38F; Dew Point: 15F; Relative Humidity: 38%
Wind: N @ 10G20 kts
Sea-level pressure: 1025.5 mb; 30.28 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 39F
6-hr Min temp: 24F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E250 -BKN 70 255/38/15/3510G20/028/ FEW SC DSNT W-N/
8/501 51013 10039 20024

————————————————————–

SUMMARY FOR SATURDAY, MARCH 23, 2024

TEMPERATURE (DEGREES F)
MAX…….44 NORMAL…..46
MIN…….30 NORMAL…..29
MEAN……37 NORMAL…..38

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………-1
TOTAL DEPARTURE FOR THE MONTH………………….+145 [+6.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………28 DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………..561 DEPARTURE……-147
TOTAL HEATING UNITS FOR THE SEASON…………4449 DEPARTURE……-691
TOTAL HEATING UNITS LAST SEASON TO DATE…….4341 DEPARTURE……+108

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)……….E48 NNW @ 10:41 P.M.
VECTOR #1 (1-Sec)……….47 NNW @ 10:41 P.M.
VECTOR #2 (1-Sec)……….48 NW @ 10:41 P.M.
DAVIS #1……………….42 NW @ 10:41 P.M.
DAVIS #2 ………………41 NNW @ 10:41 P.M.
RMY #1 (Instantaneous)…..51 NNW @ 10:41 P.M.
RMY #2 (Instantaneous)…..49 NW @ 10:41 P.M.
MERLIN…………………39 NNW
RICHARDS (C5C) (Inst)……49 @ 10:41 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………31 NNW @ 10:54 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..28 @ 07:30 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..31 @ 10:43 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………28 NW @ 10:42 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………30 NNW @ 10:43 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..27 N @ 07:29 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..30 NW @ 10:43 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………28 @ 10:42 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……12.4 ENE [298 total miles] VECTOR #1…………….12.1
VECTOR #2…………….12.8
DAVIS #1……………..12.4 NE
DAVIS #2……………..12.2 NE
RMY #1……………….11.9 NE
RMY #2……………….12.5 NE
RICHARDS (C5C)………..12.5

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..2.37 DEPARTURE…..+2.18
TOTAL PRECIPITATION FOR THE MONTH…………..6.99 DEPARTURE…..+2.88
TOTAL PRECIPITATION FOR THE YEAR (2024)…….17.55 DEPARTURE…..+4.94

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.3
TOTAL SNOWFALL FOR THE MONTH………………TRACE DEPARTURE…..-12.5
TOTAL SNOWFALL FOR THE SEASON (2023-2024)……26.1 DEPARTURE…..-38.3

————————————————————–

PRELIMINARY CLIMATE SUMMARY FOR MARCH 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
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

3/1 41/18/30/-1/0.00/0.0/649/96 30 NW VEC1 30 WNW RMY 33
3/2 50/32/41/+9/1.16/0.0/000/00 44 SSE VEC1 46 SE RMY 42
3/3 55/42/49/+17/0.24/0.0/130/19 32 SSE VEC1 33 SSE RMY 32
3/4 49/36/43/+11/0.01/0.0/116/17 24 ENE VEC1 22 ENE RMY 23
3/5 42/36/39/+7/0.14/0.0/000/00 21 E VEC1 21 E RMY 21
3/6 51/39/45/+12/0.44/0.0/000/00 28 NE VEC1 28 NE RMY 29
3/7 42/37/40/+7/1.06/0.0/000/00 44 NNE VEC1 44 NNE RMY 42
3/8 45/32/39/+6/0.00/0.0/682/98 35 NNE VEC1 36 NNE RMY 38
3/9 40/32/36/+3/0.21/0.0/000/00 32 E VEC1 32 E RMY 31
3/10 51/36/44/+10/1.07/0.0/245/35 45 WNW VEC1 46 SE RMY 45
3/11 43/30/37/+3/T/T/515/73 53 NW VEC1 54 NW RMY 58
3/12 54/33/44/+10/0.00/0.0/680/96 43 NW VEC1 41 NW RMY 45
3/13 54/33/44/+10/0.00/0.0/667/94 26 SSE VEC1 25 NNW RMY 25
3/14 58/36/47/+12/0.00/0.0/627/88 23 ENE VEC1 22 NE RMY 21
3/15 44/37/41/+6/0.02/0.0/000/00 24 N VEC1 23 NNW RMY 25
3/16 58/36/47/+12/0.00/0.0/510/71 29 S VEC1 26 S RMY 26
3/17 59/40/50/+14/0.04/0.0/390/54 38 NW VEC1 38 NW RMY 40
3/18 49/33/41/+5/0.00/0.0/558/77 38 W VEC1 37 W RMY 38
3/19 46/30/38/+2/0.00/0.0/575/79 44 NW VEC1 43 NW RMY 46
3/20 51/29/40/+3/0.11/T/190/26 50 WNW VEC1 50 WNW RMY 51
3/21 38/24/31/-6/T/T/…/.. 53 WNW VEC1 53 WNW RMY 52
3/22 40/21/31/-6/T/T/…/.. 29 WNW VEC1 29 WNW RMY 32
3/23 44/30/37/-1/2.49/T/…/.. 48 NNW VEC1 47 NNW RMY 51