Sunday, April 28, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, APRIL 28, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

COOL DAY WITH INCREASING CLOUDINESS AND DECREASING
VISIBILITY…

Today started off sunny with only 2/8 of the sky being
obstructed by clouds, and as the day progresses,
cloudiness increases. At 1 P.M. EST, we experienced
overcast conditions at the observatory, and showers making
their way into the area. At 7 A.M. EST, we had perfect
visibility, with the top of Mount Monadnock being completely
clear. At 1 P.M., visibility is reduced to 70 miles with
Monadnock being faintly visible behind haze. Our high so
far today is 50F, 10 degrees below our normal maximum
temperature of 60F.

BHO Greatest April Precipitation, inches (1885-2019):

1) 10.37 in 1987
2)  9.38 in 2004
3)  8.71 in 1929
4)  8.68 in 2007
5)  8.53 in 1904
6)  7.89 in 2019  (through 7 AM on 4/28)
7)  7.57 in 1935
7.57 in 1983
9)  7.31 in 1901

The calendar day rainfall on Monday, 4/22, was more than
two and a half inches, which made it one of the wettest
calendar days ever observed in April. The finalized
amount for the day will be reported when available.

BHO Greatest April Calendar Day Precipitation, inches (1885-2019):

1) 3.47 on April 1,  2004
2) 3.18 on April 21, 1991
3) 2.63 on April 16, 2018
4) 2.51 on April 24, 1898
2.51 on April 13, 2004
6) 2.45 on April 16, 1929
7) 2.41 on April 28, 1904
8) 2.40 on April 10, 1935

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus
Temperature: 44F; Dew Point: 32F; Wind: W at 8G16 kts
Sea-level pressure: 29.96 ins. Hg, rising then more rapidly
Visibility: 90 miles
6-hr Max temp: 44F
6-hr Min temp: 38F
24-hr Precip: Trace
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 90 SCT 90 144/44/32/2708G16/996/ 8/050 53024 70000/ 10044
20038

10 A.M.
Weather: Broken stratus, broken cirrostratus
Temperature: 46F; Dew Point: 32F; Wind: W at 6 kts
Sea-level pressure: 29.98 ins. Hg, rising then more rapidly
Visibility: 80 miles
3-hr Precip: 0.00
BHO SA 1455 E40 BKN E210 BKN 80 154/46/32/2506/998/ 8/056 53010

1 P.M.
Weather: Overcast stratus, distant haze in all directions
Temperature: 47F; Dew Point: 35F; Wind: WSW at 7 kts
Sea-level pressure: 30.00 ins. Hg, rising steadily
Visibility: 70 miles
6-hr Max temp: 50F
6-hr Min temp: 44F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
BHO SA 1755 E40 OVC 70 159/47/35/2707/000/ DSNT HZ ALQDS/ 8/6//
52005 10050 20044

SUMMARY FOR SATURDAY, APRIL 27, 2019

TEMPERATURE (DEGREES F)
MAX…..54   NORMAL…..60
MIN…..39   NORMAL…..42
MEAN….47   NORMAL…..51

DEPARTURE FROM 30-YEAR NORMAL……………………-4
TOTAL DEPARTURE FOR THE MONTH…………………..+73 [+2.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..18   DEPARTURE………+4
TOTAL HEATING UNITS FOR THE MONTH………….437   DEPARTURE……..-74
TOTAL HEATING UNITS FOR THE SEASON………..5842   DEPARTURE…….-153
TOTAL HEATING UNITS LAST SEASON TO DATE……5648   DIFFERENCE……+194

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..41 W   AT 12:27 P.M.
AERO…………………….44 W   AT  1:32 P.M.
ASOS…………………….46 W   AT 12:28 P.M.
DAVIS……………………46 WSW AT 12:09 P.M.  RMY 47
FASTEST MILE FOR YESTERDAY………………….34 W   AT  4:31 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….32 W   AT  4:32 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………33 WSW AT 12:09 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..18.4 W
ASOS…………………..17.3
DAVIS………………….18.4 WSW [244 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…TRACE  DEPARTURE…….-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….7.89  DEPARTURE…….+3.74
ASOS…………..7.83
TOTAL PRECIPITATION FOR THE YEAR……….20.93  DEPARTURE…….+2.78
ASOS………….20.98

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………0.0  DEPARTURE……..-0.1
TOTAL SNOWFALL FOR THE MONTH………….TRACE  DEPARTURE……..-2.9
TOTAL SNOWFALL FOR THE SEASON………….47.6  DEPARTURE…….-15.0

PRELIMINARY CLIMATE SUMMARY FOR MARCH 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 45/29/37/-4/0.00/0.0/748/98           40 WNW AERO 37 W   RMY 42
04/02 50/27/39/-2/…./0.0/605/79           29 S   AERO 25 S   RMY 31
04/03 62/35/49/+7/…./0.0/484/63           54 W   AERO 58 W   RMY 56
04/04 50/34/42/0/…./0.0/717/93            46 W   AERO 41 W   RMY N/A
04/05 47/27/37/-6/…./0.0/341/44           23 SSW AERO 17 SSW RMY 23
04/06 64/32/48/+5/…./0.0/536/69           24 NW  AERO 18 W   RMY 26
04/07 66/41/54/+11/0.00/0.0/320/41          24 S   AERO 18 S   RMY 25
04/08 48/34/41/-3/0.49/0.0/000/00           25 NE  AERO 20 NE  RMY 26
04/09 40/32/36/-8/0.08/0.0/000/00           23 NE  AERO 16 N   RMY 25
04/10 43/30/37/-8/T/T/000/00                32 NW  AERO 26 NW  RMY 36
04/11 51/29/40/-5/0.00/0.0/403/51           23 NW  AERO 18 NW  RMY N/A
04/12 53/38/46/+1/…./0.0/000/00           35 SSW AERO 29 SSW RMY 39
04/13 71/54/63/+17/…./0.0/167/21          38 SSW AERO 32 SSW RMY N/A
04/14 71/51/61/+15/…./0.0/224/28          25 S   AERO 18 S   RMY N/A
04/15 67/40/54/+7/…./0.0/168/21           46 W   AERO 52 W   RMY 50
04/16 58/37/48/+1/0.00/0.0/…/..           46 W   AERO 44 W   RMY 44
04/17 62/36/49/+2/0.00/0.0/…/..           26 ESE AERO 25 S   RMY 28
04/18 63/39/51/+3/0.00/0.0/…/..           44 S   AERO 44 S   RMY 50
04/19 71/58/65/+17/…./0.0/…/..          47 SSW AERO 51 SSW RMY 52
04/20 68/60/64/+15/…./0.0/…/..          50 SSW AERO 54 SSW RMY 52
04/21 68/51/60/+11/…./0.0/…/..          35 S   AERO 35 S   RMY N/A
04/22 53/45/49/0/…./0.0/…/..            35 NNE AERO 32 NNE RMY 35
04/23 52/44/48/-2/…./0.0/…/..           30 NNE AERO 26 NNE RMY N/A
04/24 65/44/55/+5/…./0.0/…/..           29 WNW AERO 29 WNW RMY 30
04/25 61/39/50/0/0.00/0.0/…/..            22 S   AERO 22 S   RMY 21
04/26 53/42/48/-3/…./0.0/…/..           35 ESE AERO 30 W   RMY 33
04/27 54/39/47/-4/…./…/…/..           41 W   AERO 44 W   RMY 47

04/28 Low temp since midnight is 38F; normal low is 42F

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

RECORDS FOR APRIL 28
HIGH 92 IN 1990, 2009
LOW 26 IN 1947
PRECIP 2.41 IN 1904
SNOWFALL 10.0 IN. IN 1987
PEAK GUST 69 MPH NE 1967

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

TODAY’S REPORT PREPARED BY: Samantha Richard