Thursday, April 12, 2018
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, APRIL 12, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME
ABOVE SEASONABLE TEMPERATURES RETURN WITH DRY
AND HAZY CONDITIONS…
Above seasonable temperatures finally returned after
a generally below seasonable start to April. So far
temperatures have been close to 6 degrees below normal
this month. Today we reached a max so far of 59F, which
is already 5 degrees above the daily normal of 54F. The
day began below seasonable with an overnight low of 33F.
This is 3 degrees below the daily normal of 36F.
Wind from the south has remained light this morning but
picked up in the afternoon with a peak gust of 22 kts
(25 MPH) by 1:00 P.M. Clouds increased today as
pressure began dropping. Visibility was limited all day
to 40 miles due to a lingering distant haze.
Today’s Observations:
7 A.M.
Weather: Sky clear
Temperature: 38F; Dew Point: 32F; Wind: WSW at 7 kts
Sea-level pressure: 30.12 ins. Hg, rising, then more rapidly
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 38F
6-hr Min temp: 33F
24-hr precip: Trace
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 CLR 40 201/38/32/2407/012/ SKC DSNT HZ ALQDS/
53016 10038 20033
10 A.M.
Weather: Scattered cirrus, few cumulus N-SSE,
Small fire 5 miles SSW, smoke plume drifting SSE
Temperature: 50F; Dew Point: 28F; Wind: SW at 5 kts,
Wind: Light
Sea-level pressure: 30.12 ins. Hg, falling steadily
Visibility: 40 miles, distant haze in all directions
3-hr precip: 0.00 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 250 SCT 40 201/50/28/2305/012/ FEW CU N-SSE
FIRE SSW 5 MI SML K PLUME DRFTNG SSE WND LGT/ 8/101 58000
1 P.M.
Weather: Scattered cumulus, broken cirrostratus,
sun dimly visible
Temperature: 59F; Dew Point: 26F; Wind: WSW at 7 kts
Sea-level pressure: 30.03 ins. Hg, falling, then more slowly
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 59F
6-hr Min temp: 38F
6-hr precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 50 SCT E250 BKN 171/59/26/2407G16/003/
DSNT HZ ALQDS SUN DMLY VSBL/ 8/106 58030 10059 20038
SUMMARY FOR WEDNESDAY, APRIL 11, 2018
TEMPERATURE (DEGREES F)
MAX…..48 NORMAL…..54
MIN…..29 NORMAL…..36
MEAN….39 NORMAL…..45
DEPARTURE FROM 30-YEAR NORMAL………………………-6
TOTAL DEPARTURE FOR THE MONTH……………………..-59 [-5.6 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….26 DEPARTURE……….+6
TOTAL HEATING UNITS FOR THE MONTH…………301 DEPARTURE………+59
TOTAL HEATING UNITS FOR THE SEASON……….5359 DEPARTURE……..-367
TOTAL HEATING UNITS LAST SEASON TO DATE…..5108 DIFFERENCE…….+251
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….24 SSE AT 6:07 P.M.
AERO……………………23 SSE AT 6:34 P.M.
ASOS……………………24 S AT 6:07 P.M.
DAVIS…………………..24 M AT 6:05 P.M ** RMY 25
FASTEST MILE FOR YESTERDAY…………………19 SSE AT 6:33 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………18 S AT 6:35 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..19 M AT 6:34 P.M.**
AVERAGE WIND SPEED AND DIRECTION…………..7.7 SSE
ASOS…………………..7.8
DAVIS………………….7.7 M**
** Davis direction malfunctioning
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE……-0.17
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.13 DEPARTURE……-0.74
ASOS…………..0.97
TOTAL PRECIPITATION FOR THE YEAR……….19.93 DEPARTURE……+4.24
ASOS………….21.06
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0 DEPARTURE……..-0.2
TOTAL SNOWFALL FOR THE MONTH…………….2.6 DEPARTURE……..+0.8
TOTAL SNOWFALL FOR THE SEASON…………..92.8 DEPARTURE…….+31.2
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
4/11 Low temp since midnight is 29F; normal low is now 36F
*Estimated
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR APRIL 12
HIGH 82 IN 1945
LOW 17 IN 1926
PRECIP 1.51 IN. IN 1993
SNOWFALL 12.0 IN. IN 1894
PEAK GUST 65e MPH W IN 1978
RECORDS FOR APRIL 13
HIGH 85 IN 1945
LOW 22 IN 1939
PRECIP 2.51 IN. IN 2004
SNOWFALL 6.8 IN. IN 1933
PEAK GUST 59 MPH SSW IN 1995
TODAY’S REPORT PREPARED BY: K.A. Geagan
