Monday, April 18, 2022

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

MONDAY, APRIL 18, 2022
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0458E
SUNSET:  1829E

ABUNDANT SUNSHINE GRADUALLY GIVING WAY TO INCREASING HIGH CLOUDS….

Plenty of sunshine has been the theme through this morning into
early this afternoon. However high thin cirrus clouds are
increasing from the southwest and west as our next storm system
approaches the region.

Temperatures made it to the mid to upper 50s before a freshening
onshore wind increased, causing them to level off. This breeze is
making for a chilly feel to the air along with dew points in the
upper 20s to low 30s.

Visibility was 70 miles all morning, but has since slipped down
to 60 miles early this afternoon.

The wind was light and variable this morning, but has switched to
an onshore flow with an increase in velocities this afternoon.
The average speed for the day is around 9mph, but as mentioned the
trend is upward. A peak gust of 25 mph was measured just prior to
the 1 P.M. observation.

The high so far today is 55F, which is 3 degrees below the
normal maximum of 58F. The low since midnight is 32F, which
is 7 degrees below the normal minimum of 39F.

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Today’s Observations:

7 A.M.
Weather: Clear
Temperature: 38F; Dew Point: 28F; Relative Humidity: 67%
Wind: WNW @ 5 kts, wind light
Sea-level pressure: 1028.7 mb; 30.38 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 38F
6-hr Min temp: 32F
24-hr Precip: TRACE
24-hr Snowfall: TRACE
Snow Depth: 0 ins.
BHO SA 1155 CLR 70 287/38/28/2905/038/ WND LGT NEW SNW PST 24 HRS TRACE/
8/000 51026 70000 10038 20032

10 A.M.
Weather: Clear, few small cumulus distant ESE-SE, few cirrus SE-W
Temperature: 50F; Dew Point: 25F; Relative Humidity: 37%
Wind: SE @ 7 kts, wind NNE variable SW
Sea-level pressure: 1028.5 mb; 30.37 in Hg: falling, then steady
Visibility: 70 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 CLR 70 285/50/25/1307/037/ FEW SML CU DSNT ESE-SE
FEW CI SE-W WND 02V23/ 8/101 56002

1 P.M.
Weather: Thin broken cirrus
Temperature: 54F, Dew point: 29F; Relative Humidity: 37%
Wind: E @ 13G22 kts, wind NNE variable ESE
Sea-level pressure: 1026.8 mb; 30.32 in Hg: falling, then more rapidly
Visibility: 60 miles
6-hr Max temp: 55F
6-hr Min temp: 38F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 E250 -BKN 60 268/54/29/0913G22/032/ WND 02V11/ 8/001 58017
10055 20038

————————————————————–

SUMMARY FOR SUNDAY, APRIL 17, 2022

TEMPERATURE (DEGREES F)
MAX…….48     NORMAL…..57
MIN…….36     NORMAL…..39
MEAN……42     NORMAL…..48

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…….-6
TOTAL DEPARTURE FOR THE MONTH………………+71 [+4.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY………….23  DEPARTURE……..+6
TOTAL HEATING UNITS FOR THE MONTH…………279  DEPARTURE…….-73
TOTAL HEATING UNITS FOR THE SEASON……….5142  DEPARTURE……-557
TOTAL HEATING UNITS LAST SEASON TO DATE…..5152  DEPARTURE…….-10

COOLING DEGREE DAYS (SEASON: JAN 2022 THRU DEC 2022)
TOTAL COOLING UNITS FOR YESTERDAY…………..0  DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………..0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE SEASON………….0  DEPARTURE……..-1
TOTAL COOLING UNITS LAST SEASON TO DATE……..0  DEPARTURE………0

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….38 N   @  1:24 P.M.
AEROVANE……………….36 WNW @  2:52 P.M.
VECTOR #2 (Instantaneous)..40     @  1:26 P.M.
DAVIS #2 ………………36 WNW @  2:52 P.M.
RMY #2 (Instantaneous)…..39 NNW @  1:24 P.M.
ASOS………..OUT OF SERVICE D/T RENOVATIONS
VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
RMY #1………OUT OF SERVICE D/T RENOVATIONS
MERLIN………OUT OF SERVICE D/T RENOVATIONS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………28 NW  @  2:59 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..28     @  2:58 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………28 NW  @  2:58 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..28 NW  @  2:58 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE…….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY #1 AVERAGE…..OUT OF SERVICE D/T RENOVATIONS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..12.2 WNW [292 total miles] VECTOR #2………………12.7
DAVIS #2……………….12.6 NW
RMY #2…………………12.5 NW
RMY #1……………OUT OF SERVICE D/T RENOVATIONS
ASOS……………..OUT OF SERVICE D/T RENOVATIONS
VECTOR #1…………OUT OF SERVICE D/T RENOVATIONS
DAVIS #1………….OUT OF SERVICE D/T RENOVATIONS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……TRACE  DEPARTURE…..-0.15
TOTAL PRECIPITATION FOR THE MONTH………….1.71  DEPARTURE…..-1.17
TOTAL PRECIPITATION FOR THE YEAR………….15.02  DEPARTURE…..-1.88

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………..TRACE  DEPARTURE……-0.1
TOTAL SNOWFALL FOR THE MONTH……………..TRACE  DEPARTURE……-2.4
TOTAL SNOWFALL FOR THE SEASON (2021-2022)…..70.7  DEPARTURE……+1.4

PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

4/01  57/35/46/+5/0.41/0.0/183/24         56 WNW AERO 55 WNW RMY 58
4/02  52/34/43/+2/0.00/0.0/697/91         45 WNW AERO 43 WNW RMY 47
4/03  51/36/44/+2/0.03/0.0/215/28         23 NE  AERO 18 NE  RMY 23
4/04  56/35/46/+4/0.02/0.0/610/79         35 NW  AERO 30 NW  RMY 34
4/05  62/37/50/+7/0.00/0.0/698/90         25 SSW AERO 24 S   RMY 25
4/06  44/39/42/-1/0.22/0.0/000/00         33 ENE AERO 32 E   RMY 34
4/07  52/38/45/+1/0.06/0.0/000/00         50 ESE AERO 50 ESE RMY 53
4/08  61/42/52/+8/0.24/0.0/470/60         45 ESE AERO 45 SE  RMY 47 TSTM
4/09  59/39/49/+5/0.10/0.0/291/37         40 S   AERO 40 S   RMY 43
4/10  55/35/45/0/T/0.0/560/71             35 NW  AERO 32 NW  RMY 34
4/11  62/35/49/+4/T/0.0/728/92            31 NNW AERO 30 NNW RMY 31
4/12  68/46/57/+11/0.06/0.0/…/..        32 W   AERO 30 W   RMY 31
4/13  71/47/59/+13/0.00/0.0/…/..        33 S   AERO 31 S   RMY 35
4/14  50/43/47/0/0.16/0.0/…/..          19 N   AERO 18 N   RMY 18
4/15  66/43/55/+8/T/0.0/…/..            37 S   AERO 37 S   RMY 39
4/16  70/40/55/+8/0.40/0.0/…/..         42 S   AERO 53 SSW RMY 45
4/17  48/36/42/-6/0.01/T/…/..           38 N   AERO 36 N   RMY 39

4/18  The low since midnight is 32F, the daily normal low is 39F

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

RECORDS FOR APRIL 18
HIGH 92 IN 1976
LOW 23 1887
PRECIP 1.48 IN 1954
SNOWFALL 4.3 IN. IN 2020
PEAK GUST 59 MPH S IN 1982

RECORDS FOR APRIL 19
HIGH 94 IN 1976 [RECORD FOR MONTH] LOW 21 IN 1890
PRECIP 1.71 IN 1969
SNOWFALL 1.3 IN. IN 1967
PEAK GUST 66 MPH E IN 1984

TODAY’S REPORT PREPARED BY: Matt Douglas