Friday, April 28, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, APRIL 28, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
MORNING FOG RETURNS AND LIFTS AS PRESSURE RISES
Dense fog covered Great Blue Hill again this morning but began clearing
by 10:00 AM. Pressure has been slowly increasing throughout the day making
for a drier afternoon. Precip. measured at 7:00 AM this morning was .02
inches. There was light drizzle at 7:00 AM which stopped shortly after
the observation with no additional precip. measured later in the day.
Winds continue to be light and from the south to southwest today. Temperatures
have warmed to 73F by 1:00PM. This is above the normal for the day of 60F.
Today’s Observations:
7 A.M.
Weather: Light drizzle, sky obscurement due to fog
Temperature: 57F; Dew Point: 57F; Wind: SSW at 10 kts
Sea-level pressure: 29.97 ins. Hg, rising unsteadily
Visibility: 1/4 mile
6-hr Max temp: 57F
6-hr Min temp: 56F
24-hr precip: 0.02 in.
24-hr snowfall: 0.0 in.
BHO SA 1155 W2 X 1/4L-F 150/57/57/2110/997/ 8////
53009 MANUAL 70002 ASOS 70001 10057 20056
10 A.M.
Weather: Broken stratus and broken altocumulus
Temperature: 63F; Dew Point: 58F; Wind: W at 8 kts,
Sea-level pressure: 29.98 ins. Hg, falling, then rising
Visibility: 40 miles except W-NNW 20 miles
3-hr precip: Trace
3-hr snowfall: 0.0 in.
BHO SA 1455 E11 BKN E70 BKN 40 154/63/58/2608/998/ VSBY 20 W-NNW/
8/63/ 53004 6000/
1 P.M.
Weather: Broken cirrostratus few cumulus SSW-NNW
Temperature: 73F; Dew Point: 60F; Wind: SW 6 kts,
Wind: Light
Sea-level pressure: 29.99 ins. Hg, rising then falling
Visibility: 50 miles except W-NNW 20 miles
6-hr Max temp: 73F
6-hr Min temp: 57F
6-hr precip: 0.00 in.
6-hr snowfall: 0.0 in.
BHO SA 1755 E220 BKN 50 155/73/60/2306/999/ FEW CU SSW-NNW VSBY 20 W-NNW
DSNT HZ ALQDS WND LGT/ 8/208 53001 10073 20057
SUMMARY FOR THURSDAY, APRIL 27, 2017
TEMPERATURE (DEGREES F)
MAX…..66 NORMAL…..60
MIN…..50 NORMAL…..42
MEAN….58 NORMAL…..51
DEPARTURE FROM 30-YEAR NORMAL…………………….+7
TOTAL DEPARTURE FOR THE MONTH…………………..+100 [+3.7 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………7 DEPARTURE……….-7
TOTAL HEATING UNITS FOR THE MONTH………….411 DEPARTURE………-93
TOTAL HEATING UNITS FOR THE SEASON………..5320 DEPARTURE……..-675
TOTAL HEATING UNITS LAST SEASON TO DATE……4944 DIFFERENCE…….+376
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….20 S AT 11:03 P.M.
AERO……………………20 S AT 8:40 P.M.
ASOS……………………20 S AT 11:07 P.M.
DAVIS…………………..19 SW AT 11:08 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………15 S AT 11:09 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………15 S AT 11:07 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..15 SSW AT 11:09 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..5.6 S
ASOS…………………..5.8
DAVIS………………….4.1 S [175 deg.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.02 DEPARTURE……-0.07
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….6.65 DEPARTURE……+2.50
ASOS…………..6.76
TOTAL PRECIPITATION FOR THE YEAR……….20.77 DEPARTURE……+2.62
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0 DEPARTURE……..0.0
TOTAL SNOWFALL FOR THE MONTH…………….2.7 DEPARTURE…….-0.2
TOTAL SNOWFALL FOR THE SEASON…………..66.4 DEPARTURE…….+3.8
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
4/1 35/31/33/-8/2.21/2.7/000/00 40 ENE AERO 41 ENE RMY 41
4/2 53/30/42/+1/0.00/0.0/552/72 32 NW AERO 33 NW RMY 34
4/3 60/35/48/+6/0.00/0.0/685/89 21 W* AERO 20 NW RMY N/A
4/4 42/35/39/-3/0.78/0.0/000/00 41 ESE AERO 43 ESE RMY 42
4/5 41/35/38/-5/0.00/0.0/000/00 21 NNW AERO 20 NNW RMY N/A
4/6 55/35/45/+2/1.27/0.0/000/00 35 SSE AERO 37 S RMY 37 TSTM
4/7 53/38/46/+3/0.00/0.0/226/29 43 SSW AERO 47 SSW RMY 48
4/8 50/34/42/-2/0.00/0.0/666/85 37 WNW AERO 40 WNW RMY 39
4/9 65/34/50/+6/0.00/0.0/716/91 23 W AERO 23 W RMY N/A
4/10 77/45/61/+16/0.00/0.0/560/71 37 S AERO 37 S RMY 39
4/11 85/50/68/+23/0.00/0.0/642/81 28 S AERO 28 S RMY 30
4/12 68/47/58/+13/0.01/0.0/382/48 26 WNW AERO 28 WNW RMY N/A
4/13 58/39/49/+3/0.00/0.0/567/71 28 WNW AERO 31 NW RMY 30
4/14 62/40/51/+5/0.00/0.0/801/100 22 NNW AERO 22 NNW RMY 24
4/15 68/40/54/+7/0.01/0.0/675/84 40 SSW AERO 45 SSW RMY 45
4/16 86/55/71/+24/T/0.0/758/94 38 W* AERO 39 SW RMY 42
4/17 75/48/62/+15/0.00/0.0/405/50 37 W AERO 37 W RMY 43
4/18 52/35/44/-4/0.00/0.0/779/96 25 ENE AERO 23 ENE RMY 25
4/19 54/34/44/-4/0.06/0.0/431/53 31 S AERO 33 S RMY 34
4/20 58/42/50/+1/0.05/0.0/270/33 25 SSW AERO 24 SSW RMY 23
4/21 45/42/44/-5/0.50/0.0/000/00 26 ESE AERO 29 ESE RMY 28
4/22 44/40/42/-7/0.14/0.0/…/.. 22 NE AERO 22 NNE RMY 20
4/23 65/37/51/+1/0.00/0.0/…/.. 28 S AERO 26 S RMY 28
4/24 69/42/56/+6/0.00/0.0/…/.. 23 SSW*AERO 22 SSW*RMY N/A
4/25 49/42/46/-4/…./0.0/…/.. 35 NE AERO 36 NE RMY 35
4/26 60/47/54/+3/…./0.0/…/.. 29 ENE AERO 28 ENE RMY N/A
4/27 66/50/58/+7/0.00/0.0/…/.. 20 S AERO 20 S RMY N/A
4/28 Low temp since midnight is 56F; normal low is now 42F
DAILY RECORDS FOR APRIL 2017
4/11/17: DAILY RECORD MAXIMUM TEMPERATURE OF 85F,
BREAKS PREVIOUS RECORD OF 78F SET IN 1945
4/11/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 50F,
TIES WITH PREVIOUS RECORD SET IN 1955
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: Kaitlin Geagan
