Wednesday, April 17, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, APRIL 17, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

PERFECT VISIBILITY THIS MORNING WITH RELATIVELY
LIGHT WINDS IN COMPARISON TO YESTERDAY….

We observed a perfect visibility of 90 miles at the
10 A.M. observation, with the average visibility today
being over 85 miles. Wind has been much lighter compared
to yesterday, with an average speed at or below 10 mph.
Skies have remained almost cloudless throughout the day,
with very distant cumulus or cirrostratus being seen
at each observation. The high temperature so far today
is 58F, 2 degrees above our normal maximum temperature
of 56F. The low since midnight is 36F, 2 degrees below
our normal minimum temperature of 38F.

Today’s Observations:

7 A.M.
Weather: Clear, few distant cumulus in all directions
Temperature: 43F; Dew Point: 29F; Wind: WNW at 7G12 kts
Sea-level pressure: 30.13 ins. Hg, rising steadily
Visibility: 85 miles
6-hr Max temp: 48F
6-hr Min temp: 36F
24-hr Precip:  0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 CLR 85 204/43/29/3007G12/013/ FEW DSNT CU
ALQDS/ 8/100 53020 10048 20036

10 A.M.
Weather: Clear, few distant cirrostratus S-SW
Temperature: 51F; Dew Point: 25F; Wind: N at 9G16 kts
Sea-level pressure: 30.15 ins. Hg, falling then rising
Visibility: 90 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 90 210/51/25/3509G16/015/ FEW DSNT CS S-SW/
8/005 50006

1 P.M.
Weather: Clear, few distant cirrostratus SE-WSW
Temperature: 59F; Dew Point: 24F; Wind: NW at 7G12 kts
Sea-level pressure: 30.15 ins. Hg, rising steadily
Visibility: 85 miles
6-hr Max temp: 59F
6-hr Min temp: 43F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
BHO SA 1755 CLR 85 211/59/24/3307G12/015/ FEW DSNT CS SE-WSW/
8/002 53001 10059 20043

SUMMARY FOR TUESDAY, APRIL 16, 2019

TEMPERATURE (DEGREES F)
MAX…..58   NORMAL…..56
MIN…..37   NORMAL…..38
MEAN….48   NORMAL…..47

DEPARTURE FROM 30-YEAR NORMAL……………………+1
TOTAL DEPARTURE FOR THE MONTH…………………..+29 [+1.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..17   DEPARTURE………-1
TOTAL HEATING UNITS FOR THE MONTH………….308   DEPARTURE……..-29
TOTAL HEATING UNITS FOR THE SEASON………..5713   DEPARTURE…….-107
TOTAL HEATING UNITS LAST SEASON TO DATE……5460   DIFFERENCE……+253

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..46 W   AT  1:18 A.M.
AERO…………………….44 W   AT  1:51 A.M.
ASOS…………………….49 W   AT  1:20 A.M.
DAVIS……………………49 W   AT  1:20 A.M.  RMY N/A
FASTEST MILE FOR YESTERDAY………………….38 W   AT  1:58 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….33 WNW AT  1:59 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………38 WSW AT  1:58 A.M.
AVERAGE WIND SPEED AND DIRECTION………….18.9 WNW
ASOS………………….17.3
DAVIS…………………18.7 W [263 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.84  DEPARTURE…….+0.18
ASOS…………..2.74
TOTAL PRECIPITATION FOR THE YEAR……….15.88  DEPARTURE…….-0.78
ASOS………….15.89

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……..-2.3
TOTAL SNOWFALL FOR THE SEASON………….47.6  DEPARTURE…….-14.4

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/-4/0.00/0.0/726/98           40 WNW AERO 37 W   RMY 42
04/02 50/27/39/-2/…./0.0/582/79           29 S   AERO 25 S   RMY 31
04/03 62/35/49/+7/…./0.0/468/63           54 W   AERO 58 W   RMY 56
04/04 50/34/42/0/…./0.0/690/93            46 W   AERO 41 W   RMY N/A
04/05 47/27/37/-6/…./0.0/324/44           23 SSW AERO 17 SSW RMY 23
04/06 64/32/48/+5/…./0.0/516/69           24 NW  AERO 18 W   RMY 26
04/07 66/41/54/+11/0.00/0.0/306/41          24 S   AERO 18 S   RMY 25
04/08 48/34/41/-3/0.49/0.0/…/..           25 NE  AERO 20 NE  RMY 26
04/09 40/32/36/-8/0.08/0.0/…/..           23 NE  AERO 16 N   RMY 25
04/10 43/30/37/-8/T/T/T/..                  32 NW  AERO 26 NW  RMY 36
04/11 51/29/40/-5/0.00/0.0/…/..           23 NW  AERO 18 NW  RMY N/A
04/12 53/38/46/+1/…./0.0/…/..           35 SSW AERO 29 SSW RMY 39
04/13 71/54/63/+17/…./0.0/…/..          38 SSW AERO 32 SSW RMY N/A
04/14 71/51/61/+15/…./0.0/…/..          25 S   AERO 18 S   RMY N/A
04/15 67/40/54/+7/…./0.0/…/..           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 Low temp since midnight is 36F; normal low is 38F

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

RECORDS FOR APRIL 17
HIGH 93 IN 2002
LOW 21 IN 1908
PRECIP 1.68 IN 1954
SNOWFALL 1.0 IN. IN 1899
PEAK GUST 63 MPH ESE IN 2011

RECORDS FOR APRIL 18
HIGH 92 IN 1976
LOW 23 1887
PRECIP 1.48 IN 1954
SNOWFALL 3.7 IN. IN 1965
PEAK GUST 59 MPH S IN 1982

TODAY’S REPORT PREPARED BY: Benjamin Turner