Friday, April 29, 2022

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

FRIDAY, APRIL 29, 2022
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0442E
SUNSET:  1842E

WINDY, CHILLY AS SUN FADES BEHIND AFTERNOON CLOUDS…

Brilliant sunshine greeted us here at sunrise, albeit it was
rather chilly for this time of year – we saw the mercury dip
to 35F (normal is 43F)! With an area of low pressure continuing
its spin over Nova Scotia, our below average temperatures and
brisk winds continue once again today. A spoke of mid and high
level clouds associated with that low is pinwheeling from north
to south, so decorative clouds have filtered into the frame
this afternoon.

Dew points began in the mid-teens and have since risen to the low-
20s. Temps are in the mid-50s, thus leading to low relative humidity
values. Add in a stiff NNW wind averaging 15 MPH with occasional gusts
over 30 MPH, and there is an increased fire danger today.

On the plus side, visibility is an astounding 80 miles!

The high so far today is 55F, which is 7 degrees below the
normal maximum of 62F. The low since midnight is 35F, which
is 8 degrees lower than the normal minimum of 43F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Clear
Temperature: 39F; Dew Point: 14F; Relative Humidity: 35%
Wind: NNW @ 18G30 kts
Peak Wind: 35 MPH (30 kts) NNW @ 6:54 AM
Sea-level pressure: 1014.3mb; 29.95 in. Hg: Rising, then falling
Visibility: 85 miles
6-hr Max temp: 39F
6-hr Min temp: 35F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 CLR 85 143/39/14/3318G30/995/ PK WND 3330/54/ 8/000 50007 10039 20035

10 A.M.
Weather: Clear
Temperature: 46F; Dew Point: 15F; Relative Humidity: 34%
Wind: NNW @ 17G31
Peak Gust: 36 MPH (31 kts) NNW @ 9:49 AM
Sea-level pressure: 1013.9mb; 29.94 in Hg: Steady, then falling
Visibility: 80 miles
3-hr Precip: 0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 CLR 80 139/46/15/3317G31/994/ PK WND 3331/49/ 8/000 58004

1 P.M.
Weather: Scattered Altocumulus & Altocumulus Standing-Lenticularis, (thin)
Broken Cirrus
Temperature: 55F, Dew point: 23F; Relative Humidity: 28%
Wind: N @ 16G25 kts
Sea-level pressure: 1013.0 mb; 29.91 in Hg: Falling, then more slowly
Visibility: 80 miles
6-hr Max temp: 55F
6-hr Min temp: 39F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 70 SCT 250 -BKN 80 130/55/23/3516G25/991/ 8/041 56009 10055 20039

————————————————————–

SUMMARY FOR THURSDAY, APRIL 28, 2022

TEMPERATURE (DEGREES F)
MAX…….53     NORMAL…..62
MIN…….35     NORMAL…..43
MEAN……44     NORMAL…..52

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…….-8
TOTAL DEPARTURE FOR THE MONTH………………+49 [+1.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY………….21  DEPARTURE……..+8
TOTAL HEATING UNITS FOR THE MONTH…………462  DEPARTURE…….-53
TOTAL HEATING UNITS FOR THE SEASON……….5325  DEPARTURE……-537
TOTAL HEATING UNITS LAST SEASON TO DATE…..5311  DEPARTURE…….+14

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……..-2
TOTAL COOLING UNITS FOR THE SEASON………….0  DEPARTURE……..-2
TOTAL COOLING UNITS LAST SEASON TO DATE……..0  DEPARTURE………0

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….45 NNW @  7:05 A.M.
AEROVANE……………….45 NW  @  6:33 A.M.
VECTOR #2 (Instantaneous)..50     @  8:09 A.M.
DAVIS #2 ………………41 WNW @  8:44 A.M.
RMY #2 (Instantaneous)…..46 NNW @  8:09 A.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………………30 NW  @  6:21 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..30     @  6:33 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………29 NW  @  6:21 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..29 NW  @  6:21 A.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…….. 18.5 NW [443 total miles] VECTOR #2……………… 18.3
DAVIS #2………………. 18.1 NNW
RMY #2………………… 17.9 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…….0.00  DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH………….2.97  DEPARTURE…..-1.51
TOTAL PRECIPITATION FOR THE YEAR………….16.28  DEPARTURE…..-2.22

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………….0.0  DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE MONTH……………..TRACE  DEPARTURE……-2.8
TOTAL SNOWFALL FOR THE SEASON (2021-2022)…..70.7  DEPARTURE……+1.0

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/+11/0.06/0.0/349/44        32 W   AERO 30 W   RMY 31
4/13  71/47/59/+13/0.00/0.0/670/84        33 S   AERO 31 S   RMY 35
4/14  50/43/47/0/0.16/0.0/000/00          19 N   AERO 18 N   RMY 18
4/15  66/43/55/+8/T/0.0/691/86            37 S   AERO 37 S   RMY 39
4/16  70/40/55/+8/0.40/0.0/314/39         42 S   AERO 53 SSW RMY 45
4/17  48/36/42/-6/0.01/T/461/57           38 N   AERO 36 N   RMY 39
4/18  55/32/44/-4/0.00/0.0/616/76         35 E   AERO 30 E   RMY 34
4/19  55/39/47/-2/0.96/0.0/325/40         55 S   AERO 53 S   RMY 58
4/20  56/37/47/-2/0.00/0.0/808/99         40 WNW AERO 37 WNW RMY 41
4/21  60/40/50/0/T/0.0/541/66             45 SSW AERO 41 SSW RMY 47
4/22  65/46/56/+6/0.00/0.0/699/85         39 WNW AERO 35 WNW RMY 39
4/23  66/40/53/+3/0.00.0.0/577/70         24 NW  AERO 22 W   RMY 25
4/24  50/40/45/-6/T/0.0/165/20            29 ENE AERO 26 ENE RMY 30
4/25  59/41/50/-1/0.00/0.0/464/56         22 S   AERO 21 S   RMY 23
4/26  54/42/48/-4/…./0.0/…/..         20 SSW AERO 18 S   RMY 21
4/27  56/39/48/-4/…./0.0/…/..         48 NW  AERO 47 NW  RMY 48
4/28  53/35/44/-8/…./0.0/…/..         45 NNW AERO 45 NW  RMY 46

4/29  The low since midnight is 35F, the daily normal low is 43F

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

RECORDS FOR APRIL 29
HIGH 85 IN 1974
LOW 26 IN 1909
PRECIP 1.65 IN 1923
SNOWFALL 1.0 IN. IN 1987
PEAK GUST 55 MPH WNW IN 2010

RECORDS FOR APRIL 30
HIGH 86 IN 1942
LOW 30 IN 1931
PRECIP 1.41 IN 1991
SNOWFALL 0.3 IN. IN 1909
PEAK GUST 64e MPH NW IN 1978

TODAY’S REPORT PREPARED BY: Andrew Swanson