Sunday, April 15, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, APRIL 15, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

A WINDY, BELOW SEASONABLE DAY WITH LIGHT SNOW
ON GREAT BLUE HILL….

It has remained overcast and windy for most of the day,
with frequent gusts at or above 30 miles per hour. Light
snow has continued for most of the day, only leaving a
trace. A snow squall was observed at 1:30 P.M., and
lasted until 1:40 P.M. A distant fog has increased since
this morning, bringing visibility from 40 miles to six
miles on average. The maximum temperature since 7:00 A.M.
is only 35F, 21 degrees below the daily normal of 56F. The
low since midnight is 33F, 5 degrees below the daily normal
minimum of 38F.

Today’s Observations:

7 A.M.
Weather: Overcast stratus
Temperature: 34F; Dew Point: 23F; Wind: ENE at 17G30 kts,
Peak Wind: 30 ENE at 6:32 A.M.
Sea-level pressure: 30.44 ins. Hg, rising, then more slowly
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 35F
6-hr Min temp: 33F
24-hr precip: 0.0 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 E37 OVC 40 307/34/23/0717G30/044/ DSNT HZ ALQDS
PK WND 0730/32/ 8/6// 51024 10035 20033

10 A.M.
Weather: Overcast nimbostratus, very light snow
Temperature: 32F; Dew Point: 32F; Wind: ENE at 16G28 kts,
Peak Wind: 30 ENE at 9:34 A.M.
Sea-level pressure: 30.49 ins. Hg, rising steadily
Visibility: 30 miles, distant fog in all directions
3-hr precip: 0.00 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 E31 OVC 30S- 325/32/32/0716G28/049/ DSNT FG ALQDS
PCPN VRY LGT PK WND 0730/34/ 8/6// 53018

1 P.M.
Weather: Overcast nimbostratus, light snow
Temperature: 32F; Dew Point: 32F; Wind: ENE at 14G27 kts,
Peak Wind: 30 ENE at 12:08 P.M.
Sea-level pressure: 30.47 ins. Hg, falling, then more rapidly
Visibility: 2 miles, except E-W 10 miles, distant fog
in all directions
6-hr Max temp: 34F
6-hr Min temp: 30F
6-hr precip: 0.01 ins.
6-hr snowfall: Trace
Snow depth: 0 ins.
BHO SA 1755 E10 OVC 6S-F 319/32/32/0714G27/047/ DSNT FG ALQDS
VSBY E-W 10 WNW-ENE 2 NEW SNW PST 6 HRS TRACE PK WND 0730/08/
8/6// 58006 MANUAL 60001 ASOS 60002 10034 20030

SUMMARY FOR SATURDAY, APRIL 14, 2018

TEMPERATURE (DEGREES F)
MAX…..51   NORMAL…..55
MIN…..36   NORMAL…..37
MEAN….44   NORMAL…..46

DEPARTURE FROM 30-YEAR NORMAL………………………-2
TOTAL DEPARTURE FOR THE MONTH……………………..-49 [-3.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….21   DEPARTURE……….+2
TOTAL HEATING UNITS FOR THE MONTH…………349   DEPARTURE………+47
TOTAL HEATING UNITS FOR THE SEASON……….5407   DEPARTURE……..-377
TOTAL HEATING UNITS LAST SEASON TO DATE…..5145   DIFFERENCE…….+262

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….33 ENE AT  3:38 P.M.
AERO……………………31 ENE AT 11:23 P.M.
ASOS……………………35 NE  AT 11:27 P.M.
DAVIS…………………..32 M   AT  3:38 P.M ** RMY N/A
FASTEST MILE FOR YESTERDAY…………………25 ENE AT  3:39 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………24 ENE AT  3:41 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..23 M   AT  3:38 P.M.**
AVERAGE WIND SPEED AND DIRECTION………….13.6 ENE
ASOS………………….13.7
DAVIS…………………12.7 M**
** Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.16  DEPARTURE……-1.20
ASOS…………..1.15
TOTAL PRECIPITATION FOR THE YEAR……….19.96  DEPARTURE……+3.78
ASOS………….21.39

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.1
TOTAL SNOWFALL FOR THE MONTH…………….2.6  DEPARTURE……..+0.5
TOTAL SNOWFALL FOR THE SEASON…………..92.8  DEPARTURE…….+30.9

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 58/33/46/+5/…./0.0/336/44   45 SSW AERO 43 SSW RMY N/A
4/02 38/30/34/-7/…./1.6/077/10   20 SSW AERO 15 SSW RMY 17
4/03 48/30/39/-3/…./0.0/…/..   28 SSE AERO 25 SSE RMY 25
4/04 54/36/45/+3/…./0.0/…/..   56 WNW AERO 56 WNW RMY 54
4/05 40/27/34/-9/0.00/0.0/…/..   53 WNW AERO 53 WNW RMY 52
4/06 41/25/33/-10/0.25/1.0/…/..  37 S   AERO 36 S   RMY 38
4/07 46/32/35/-4/0.00/0.0/…/..   32 WNW AERO 35 WNW RMY 34
4/08 41/29/35/-9/0.00/0.0/…/..   35 WNW*AERO 31 WNW RMY 34
4/09 45/24/35/-9/0.00/0.0/…/..   28 WNW*AERO 25 WNW RMY 29
4/10 39/31/35/-10/T/T/…/..       14 SSW AERO 13 SSW RMY N/A
4/11 48/29/39/-6/T/0.0/…/..      24 SSE AERO 23 SSE RMY 25
4/12 61/33/47/+2/…./0.0/…/..   39 SSW AERO 38 SSW RMY 41
4/13 65/47/56/+10/T/0.0/…/..     37 SSW AERO 37 SSW RMY N/A
4/14 51/36/44/-2/…./0.0/…/..   33 ENE AERO 31 ENE RMY N/A

4/15 Low temp since midnight is 33F; normal low is now 38F

*Estimated

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

RECORDS FOR APRIL 15
HIGH 81 IN 1896
LOW 23 IN 1943
PRECIP 1.75 IN. IN 2007
SNOWFALL 1.0 IN. IN 1916, 1962
PEAK GUST 66 MPH E IN 2007

RECORDS FOR APRIL 16
HIGH 89 IN 2012
LOW 23 IN 1943
PRECIP 2.45 IN. IN 1929
SNOWFALL 2.0 IN. IN 1904, 1962
PEAK GUST 73 MPH E IN 2007

TODAY’S REPORT PREPARED BY: Benjamin Turner