Sunday, April 19, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, APRIL 19, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

AN ALMOST CLEAR DAY WITH A WARM SOUTHWESTERLY
BREEZE….

The summit of Blue Hill lost all of its snow
depth by 1 P.M. due to abundant sunshine and
a significant increase in temperature since
this morning. Wind is on the rise, reaching
34 mph after noontime.

Our high temperature so far today is 58F,
which is 1 degree above our daily normal high
temperature of 57F. The low since midnight is
31F, which is 8 degrees below the daily normal
low of 39F.

Today’s Observations:

7 A.M.
Weather: Scattered cirrostratus
Temperature: 35F; Dew Point: 27F; Relative Humidity: 72%
Wind: SW at 10 kts
Sea-level pressure: 29.88 ins. Hg: falling, then rising
Visibility: 35 miles
6-hr Max temp: 33F
6-hr Min temp: 31F
24-hr Precip:   0.11 ins.
24-hr Snowfall: 0.1 ins.
BHO SA 1155 250 SCT 35 117/35/27/2410/988/ NEW SNOW PST 24
HRS 0.1 INS/ 8/008 4/003 70011 51005 10033 20031

10 A.M.
Weather: Scattered cirrostratus
Temperature: 49F; Dew Point: 29F; Relative Humidity: 46%
Wind: SW at 11G19 kts
Sea-level pressure: 29.85 ins. Hg: falling
Visibility: 35 miles
3-hr Precip:   0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 250 SCT 35 106/49/29/2411G19/985/ 8/008 58011

1 P.M.
Weather: Scattered cirrostratus
Temperature: 58F; Dew Point: 32F; Relative Humidity: 37%
Wind: SW at 13G27 kts, peak wind of 31 MPH at 12:47 P.M.
Sea-level pressure: 29.85 ins. Hg: falling slowly
Visibility: 70 miles
6-hr Max temp: 58F
6-hr Min temp: 35F
6-hr Precip:   0.00 ins
6-hr Snowfall: 0.0 ins
BHO SA 1755 250 SCT 70 072/58/32/2313G27/985/ PK WND 2127/47/
8/008 58034 10058 20035

SUMMARY FOR SATURDAY, APRIL 18, 2020

TEMPERATURE (DEGREES F)
MAX…..37   NORMAL…..57
MIN…..31   NORMAL…..39
MEAN….34   NORMAL…..48

DEPARTURE FROM 30-YEAR NORMAL……………….-14
TOTAL DEPARTURE FOR THE MONTH……………….-13 [-0.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………31  DEPARTURE…….+14
TOTAL HEATING UNITS FOR THE MONTH…………..384  DEPARTURE…….+12
TOTAL HEATING UNITS FOR THE SEASON…………5257  DEPARTURE……-598
TOTAL HEATING UNITS LAST SEASON TO DATE…….5742  DEPARTURE……-485

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..29 NE  AT  1:32 P.M.
AERO…………………….25 NE  AT  1:23 P.M
ASOS…………………….26 NE  AT 12:02 P.M.
DAVIS……………………25 ENE AT 12:03 P.M. RMY 25
FASTEST MILE FOR YESTERDAY………………….16 NNE AT  1:34 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 NNE AT  1:33 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………18 NE  AT 12:04 P.M.
AVERAGE WIND SPEED AND DIRECTION……………..8.6 NE
ASOS……………………..9.5
DAVIS…………………….8.7 NNE [35 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.11  DEPARTURE……-0.03
ASOS…………..0.12
TOTAL PRECIPITATION FOR THE MONTH……….5.66  DEPARTURE……+2.72
ASOS…………..5.84
TOTAL PRECIPITATION FOR THE YEAR……….14.99  DEPARTURE……-1.95
ASOS………….15.57

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.1  DEPARTURE…….+0.0
TOTAL SNOWFALL FOR THE MONTH…………….4.3  DEPARTURE…….+1.8
TOTAL SNOWFALL FOR THE SEASON…………..31.9  DEPARTURE……-30.3

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/…/..         28 NE  AERO 28 NE  RMY 30
04/02  46/35/41/0/…/0.0/…/..           39 NW  AER0 40 NW  RMY 41
04/03  42/38/40/-2/…./0.0/…/..         48 NE  AERO 53 NE  RMY 49
04/04  46/36/41/-1/…./0.0/…/..         38 NE  AERO 38 NE  RMY N/A
04/05  55/36/46/+3/T/0.0/…/..            22 S   AERO 21 S   RMY 21
04/06  61/40/51/+8/0.00/0.0/…/..         29 NW  AERO 30 NW  RMY 29
04/07  63/42/53/+10/0.00/0.0/…/..        29 W   AERO 30 W   RMY 28
04/08  50/41/46/+2/…./…/…/..         23 S   AERO 22 S   RMY 22
04/09  47/37/42/-2/…./…/…/..         58 W   AERO 58 W   RMY 56
04/10  47/35/41/-4/0.02/T/…/..           48 W   AERO 50 W   RMY 53
04/11  51/33/42/-3/0.00/0.0/…/..         38 WNW AERO 39 WNW RMY 40
04/12  60/33/47/+2/0.00/0.0/…/..         38 S   AERO 40 S   RMY N/A
04/13  59/50/55/+9/1.42/0.0/…/..         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/…./…/…/..         41 W   AERO 39 W   RMY 41
04/18  37/31/34/-14/…./4.3/…/..        29 NE  AERO 25 NE  RMY 25

04/19 The low since midnight is 31F, daily normal minimum is 39F

DAILY RECORDS FOR APRIL 2020

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

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

RECORDS FOR APRIL 19
HIGH 94 IN 1976 [RECORD FOR MONTH] LOW 21 IN 1890
PRECIP 1.71 IN 1969
SNOWFALL 6.0 IN. IN 1887
PEAK GUST 66 MPH E IN 1984

RECORDS FOR APRIL 20
HIGH 88 IN 1927
LOW 18 IN 1897
PRECIP 1.14 IN 1972
SNOWFALL 2.5 IN. IN 1904, 1972
PEAK GUST 76 MPH WNW IN 1963

TODAY’S REPORT PREPARED BY: Benjamin Turner