Tuesday, April 11, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, APRIL 11, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0510E
SUNSET: 1821E
FILTERED SUNSHINE THROUGH MAINLY HIGH CLOUDS, TURNING BREEZY AND
WARM HERE AT BLUE HILL…
The dry stretch of weather continues as we’ve not recorded any
rainfall in the last 5 days. The precipitation departure has
now slipping into a pretty sizable deficit for the month to
date, with us being more a 1.25″ below normal.
With the abnormally warm temperatures occurring this week, and
the continued low relative humidity, the ground will continue
to dry out at a rapid clip. This will markedly increase the fire
danger through the week. A Red Flag Warning has been issued
for this reason.
Speaking of abnormally warm, we have reached the mid 70s today.
This is the first time since back on November 12th that we’ve
seen a temperature of 70F or higher. The dew point has dropped
into the low 20s, yielding a relative humidity of 14% early this
afternoon. These are pretty arid values for this part of the
country.
The wind has become quite gusty this afternoon out of the west.
The peak gust so far is around 35mph. The average speed for the
day so far is around 12mph.
Visibility has been gradually improving from around 35 miles
this morning to 60 miles early this afternoon.
The high so far today is 75F, which is 21F degrees above the
normal maximum of 54F. The low since midnight is 45F degrees,
which is 9 degrees above the normal minimum for the day of 36F.
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Today’s Observations:
7 A.M.
Weather: Scattered altocumulus, broken cirrus
Temperature: 50F; Dew Point: 26F; Relative Humidity: 38%
Wind: W @ 9 kts
Sea-level pressure: 1021.3 mb; 30.16 in. Hg: falling, then rising
Visibility: 35 miles, hazy
6-hr Max temp: 50F
6-hr Min temp: 45F
24-hr Precip: 0.00
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 120 SCT E250 BKN 35 213/50/26/2709/016/ HAZY/
8/051 50000 10050 20045
10 A.M.
Weather: Thin overcast cirrus
Temperature: 66F; Dew Point: 30F; Relative Humidity: 25%
Wind: W @ 7 kts
Sea-level pressure: 1018.9 mb; 30.09 in. Hg: falling, then more rapidly
Visibility: 45 miles, hazy
3-hr Precip: 0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E250 -OVC 45 189/66/30/2607/009/ HAZY/ 8/001 58024
1 P.M.
Weather: Thin broken cirrus, few altocumulus all quadrants
Temperature: 73F; Dew Point: 21F; Relative Humidity: 14%
Wind: W @ 20G30 kts, peak wind W 35mph at 12:51 P.M.
Sea-level pressure: 1014.8 mb; 29.97 in. Hg: falling, then more rapidly
Visibility: 60 miles
6-hr Max temp: 75F
6-hr Min temp: 50F
6-hr Precip: 0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 E250 -BKN 60 148/73/21/2820G30/997/ FEW AC ALQDS
PK WND 2830/51/ 8/051 58041 10075 20050
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SUMMARY FOR MONDAY, APRIL 10, 2023
TEMPERATURE (DEGREES F)
MAX…….65 NORMAL…..54
MIN…….33 NORMAL…..36
MEAN……49 NORMAL…..45
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+4
TOTAL DEPARTURE FOR THE MONTH…………………+23 [+2.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………16 DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE MONTH…………..198 DEPARTURE…….-24
TOTAL HEATING UNITS FOR THE SEASON…………4730 DEPARTURE……-839
TOTAL HEATING UNITS LAST SEASON TO DATE…….5051 DEPARTURE……-321
PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
F420C (Official)………..18 WSW @ 11:16 A.M.
VECTOR #1 (1-Sec)……….19 NW @ 3:28 P.M.
VECTOR #2 (1-Sec)……….20 WSW @ 10:07 P.M.
DAVIS #1……………….18 WSW @ 4:44 A.M.
DAVIS #2 ………………20 W @ 1:18 P.M.
RMY #1 (Instantaneous)…..20 WSW @ 11:16 A.M.
RMY #2 (Instantaneous)…..20 WSW @ 10:07 P.M.
MERLIN…………………20 W
RICHARDS (C5C) (Inst)……20 @ 12:11 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 SW @ 9:47 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14 @ 9:44 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..14 @ 10:11 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 SW @ 12:11 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 WSW @ 12:11 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 SW @ 9:44 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..14 WSW @ 10:11 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………14 @ 9:44 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..9.2 ENE [220 total miles]
VECTOR #1………………9.5
VECTOR #2………………9.7
DAVIS #1……………….9.5 WSW
DAVIS #2……………….M
RMY #1…………………9.4 WSW
RMY #2…………………9.6 WSW
RICHARDS (C5C)………….9.8
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE MONTH…………..0.43 DEPARTURE…..-1.28
TOTAL PRECIPITATION FOR THE YEAR…………..15.04 DEPARTURE…..-0.69
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.2
TOTAL SNOWFALL FOR THE MONTH………………..0.0 DEPARTURE……-1.7
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-33.7
————————————————————–
PRELIMINARY CLIMATE SUMMARY FOR APRIL 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
4/1 60/39/50/+9/0.39/0.0/145/19 36 SW VEC1 40 SW RMY 41
4/2 50/30/40/-1/0.00/0.0/636/83 40 NNW VEC1 44 NNW RMY 45
4/3 51/28/40/-2/0.00/0.0/737/96 41 SSW VEC1 46 SSW RMY 46
4/4 62/40/51/+9/0.00/0.0/594/77 26 ENE VEC1 26 ENE RMY 27
4/5 45/37/41/-2/0.02/0.0/000/00 33 ENE VEC1 34 ENE RMY 37
4/6 62/37/50/+7/0.02/0.0/…/.. 26 NW VEC1 28 NNW RMY 29
4/7 58/36/47/+3/0.00/0.0/…/.. 45 WNW VEC1 48 WNW RMY 52
4/8 50/29/40/-4/0.00/0.0/…/.. 26 NNW VEC1 29 NNW RMY 31
4/9 54/33/44/0/0.00/0.0/…/.. 25 S VEC1 28 S RMY 28
4/10 65/33/49/+4/0.00/0.0/…/.. 18 WSW VEC1 19 NW RMY 20
4/11 The low since midnight is 45F, the daily normal low is 36F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR APRIL 11
HIGH 85 IN 2017
LOW 19 IN 1909
PRECIP 1.72 IN. IN 2003
SNOWFALL 9.5 IN. IN 1958
PEAK GUST 65 MPH NW IN 1963
RECORDS FOR APRIL 12
HIGH 82 IN 1945
LOW 17 IN 1926
PRECIP 1.51 IN. IN 1993
SNOWFALL 9.0 IN. IN 1894
PEAK GUST 65e MPH W IN 1978
TODAY’S REPORT PREPARED BY: Matt Douglas
