Sunday, April 26, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, APRIL 26, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST WITH AN INCREASING EASTERLY WIND AND
SOME LIGHT RAIN….

We observed overcast skies today, mostly consisting
of altostratus. Visibility was 75 miles this morning,
decreasing to 30 miles by 1 P.M. Light rain was seen
with a drop in pressure, as well as a wind increase.
The highest gust seen so far this afternoon is 26 mph.
Light rain left only a trace since 11 A.M., but has
increased in intensity as the afternoon goes on.

Our high temperature so far today is 51F, which is 9
degrees below our daily normal high temperature of 60F.
The low since midnight is 44F, which is 2 degrees above
the daily normal low of 42F.

Today’s Observations:

7 A.M.
Weather: Overcast altostratus
Temperature: 44F; Dew Point: 32F; Relative Humidity: 62%
Wind: E at 8 kts
Sea-level pressure: 30.12 ins. Hg: rising unsteadily
Visibility: 75 miles
6-hr Max temp: 44F
6-hr Min temp: 42F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 E75 OVC 75 200/44/32/1008/012/ 8/02/ 50006
10044 20042

10 A.M.
Weather: Overcast altostratus
Temperature: 48F; Dew Point: 18F; Relative Humidity: 30%
Wind: E at 7 kts
Sea-level pressure: 30.10 ins. Hg: falling steadily
Visibility: 75 miles
3-hr Precip:   0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E75 OVC 75 188/48/18/1007/010/ 8/02/ 58008

1 P.M.
Weather: Overcast nimbostratus, very light rain
Temperature: 47F; Dew Point: 36F; Relative Humidity: 64%
Wind: E at 17G23 kts
Sea-level pressure: 30.02 ins. Hg: falling, then more rapidly
Visibility: 30 miles
6-hr Max temp: 51F
6-hr Min temp: 44F
6-hr Precip:  Trace
6-hr Snowfall: 0.0 ins.
BHO SA 1755 E75 OVC 30 161/47/36/0917G23/002/ R-CTD PCPN
VRY LGT/ 8/02/ 600// 58027 10051 20044

SUMMARY FOR SATURDAY, APRIL 25, 2020

TEMPERATURE (DEGREES F)
MAX…..60   NORMAL…..60
MIN…..38   NORMAL…..41
MEAN….49   NORMAL…..50

DEPARTURE FROM 30-YEAR NORMAL……………….-1
TOTAL DEPARTURE FOR THE MONTH……………….-58 [-2.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………16  DEPARTURE……..+8
TOTAL HEATING UNITS FOR THE MONTH…………..539  DEPARTURE…….+56
TOTAL HEATING UNITS FOR THE SEASON…………5412  DEPARTURE……-554
TOTAL HEATING UNITS LAST SEASON TO DATE…….5806  DEPARTURE……-394

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 S   AT   7:52 P.M.
AERO…………………….24 S   AT   7:08 P.M
ASOS…………………….25 S   AT   7:52 P.M.
DAVIS……………………26 S   AT   7:08 P.M. RMY 24
FASTEST MILE FOR YESTERDAY………………….18 S   AT   7:52 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 S   AT   7:52 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………18 S   AT   7:51 P.M.
AVERAGE WIND SPEED AND DIRECTION……………..9.1 W
ASOS……………………..9.4
DAVIS…………………….9.1 SW [229 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….6.34  DEPARTURE……+2.46
ASOS…………..6.52
TOTAL PRECIPITATION FOR THE YEAR……….15.67  DEPARTURE……-2.21
ASOS………….16.25

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.1
TOTAL SNOWFALL FOR THE MONTH…………….4.3  DEPARTURE…….+1.4
TOTAL SNOWFALL FOR THE SEASON…………..31.9  DEPARTURE……-30.7

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

04/01  42/28/35/-6/0.00/0.0/008/01         28 NE  AERO 28 NE  RMY 30
04/02  46/35/41/0/…/0.0/000/00           39 NW  AER0 40 NW  RMY 41
04/03  42/38/40/-2/…./0.0/000/00         48 NE  AERO 53 NE  RMY 49
04/04  46/36/41/-1/…./0.0/278/36         38 NE  AERO 38 NE  RMY N/A
04/05  55/36/46/+3/T/0.0/039/05            22 S   AERO 21 S   RMY 21
04/06  61/40/51/+8/0.00/0.0/732/94         29 NW  AERO 30 NW  RMY 29
04/07  63/42/53/+10/0.00/0.0/649/83        29 W   AERO 30 W   RMY 28
04/08  50/41/46/+2/…./…/047/06         23 S   AERO 22 S   RMY 22
04/09  47/37/42/-2/…./…/000/00         58 W   AERO 58 W   RMY 56
04/10  47/35/41/-4/0.02/T/324/41           48 W   AERO 50 W   RMY 53
04/11  51/33/42/-3/0.00/0.0/730/92         38 WNW AERO 39 WNW RMY 40
04/12  60/33/47/+2/0.00/0.0/326/41         38 S   AERO 40 S   RMY N/A
04/13  59/50/55/+9/1.42/0.0/000/00         79 S   AERO 83 S   RMY 78
04/14  57/41/49/+3/0.00/0.0/…/..         41 W   AERO 40 W   RMY N/A
04/15  52/36/44/-3/0.02/0.0/…/..         37 W   AERO 36 W   RMY 37
04/16  47/32/40/-7/T/T/…/..              33 WNW AERO 33 WNW RMY 32
04/17  49/29/39/-8/…./0.0/…/..         41 W   AERO 39 W   RMY 41
04/18  37/31/34/-14/…./4.3/…/..        29 NE  AERO 25 NE  RMY 25
04/19  60/31/46/-2/0.00/0.0/…/..         40 SSW AERO 40 SSW RMY 41
04/20  49/37/43/-6/0.00/0.0/…/..         25 ENE AERO 22 W   RMY N/A
04/21  53/33/43/-6/…./…/…/..         52 S   AERO 52 S   RMY 52
04/22  43/30/37/-12/0.00/0.0/…/..        51 W   AERO 50 W   RMY 50
04/23  55/29/42/-8/0.00/0.0/…/..         31 W   AERO 29 W   RMY N/A
04/24  42/37/40/-10/…./…/…/..        31 NNE AERO 29 NNE RMY 29
04/25  60/38/49/-1/0.00/0.0/…/..         25 S   AERO 24 S   RMY 24

04/26 The low since midnight is 42F, daily normal minimum is 42F

DAILY RECORDS FOR APRIL 2020

4/13/2020
NEW PEAK GUST OF 79 MPH S, REPLACING THE OLD
RECORD OF 59 MPH SSW IN 1995

4/18/2020
NEW RECORD SNOWFALL OF 4.3 INS, REPLACING THE OLD
RECORD OF 3.7 INS IN 1965

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

RECORDS FOR APRIL 26
HIGH 88 IN 2009
LOW 23 IN 1919
PRECIP 1.64 IN. IN 1931
SNOWFALL 1.0 IN. IN 2000
PEAK GUST 53 MPH SSW IN 1996

RECORDS FOR APRIL 27
HIGH 93 IN 1990
LOW 28 IN 1919
PRECIP 1.89 IN 1979
SNOWFALL 2.7 IN. IN 1993
PEAK GUST 65e MPH N IN 1941

TODAY’S REPORT PREPARED BY: Benjamin Turner