Monday, April 25, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, APRIL 25, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

LIGHT WINDS, TEMPERATURES AT AVERAGE VALUES

Skies remained mostly cloudy today but started clearing in the
afternoon.  Visibility remained near 65 miles despite
thin distant fog in the morning.  Wind speeds were also
light with a peak gust of only 14 MPH by the 1:00PM EST
observation.

Temperatures were at their normal values for April 25.
The low temperature recorded just after midnight this morning
was 41F.  By the 1:00PM EST observation, the maximum
temperature was 60F.

Today’s Observations:

7 A.M.
Weather: Overcast altostratus
Temperature: 44F; Dew Point: 41F; Wind: estimated S at 5 kts,
Wind: Light
Sea-level pressure: 30.06 ins. Hg, rising, then more quickly
Visibility: 70 miles, thin fog in all directions
6-hr Max temp: 44F
6-hr Min temp: 42F
24-hr precip: 0.00 in.
BHO SA 1155 E70 OVC 70 181/44/41/E1905/006/
THN FG ALQDS WND LGT/ 8/02/ 53007 10044 20042

10 A.M.
Weather: Broken altostratus, few cumulus E-SW
Temperature: 49F; Dew Point: 36F; Wind: estimated E at 3 kts,
Wind: Light
Sea-level pressure: 30.04 ins. Hg, falling, then more slowly
Visibility: 65 miles
BHO SA 1455 E70 BKN 65 173/49/36/E1003/004/
FEW CU E-SW WND LGT/ 8/120 56008

1 P.M.
Weather: Broken altocumulus, few cumulus E-S
Temperature: 60F; Dew Point: 27F; Wind: estimated WNW at 5 kts,
Wind: Light
Sea-level Pressure: 29.97 ins. HG, falling, then more slowly
Visibility: 65 miles
6-hr Max temp: 60F
6-hr Min temp: 43F
BHO SA 1755 E75 BKN 65 150/60/27/E2905/997/
FEW CU E-S WND LGT/ 8/130 56023 10060 20043

SUMMARY FOR SUNDAY, APRIL 24, 2016

TEMPERATURE (DEGREES F)
MAX…..59   NORMAL…..59
MIN…..38   NORMAL…..41
MEAN….49   NORMAL…..50

DEPARTURE FROM 30-YEAR NORMAL…………………….-1
TOTAL DEPARTURE FOR THE MONTH…………………….-4 [-0.4] DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..16   DEPARTURE……….+1
TOTAL HEATING UNITS FOR THE MONTH………….473   DEPARTURE……….+5
TOTAL HEATING UNITS FOR THE SEASON………..4892   DEPARTURE…….-1060
TOTAL HEATING UNITS LAST SEASON TO DATE……6174   DIFFERENCE……-1282

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23  NW  AT   1:37 P.M.*
ASOS……………………25  NW  AT   1:36 P.M.
DAVIS…………………..23 WNW  AT  11:16 A.M. RMY 24
FASTEST MILE FOR YESTERDAY…………………17 WNW  AT  12:12 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………17  NW  AT   2:32 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..16 WNW  AT   1:14 P.M.
AVERAGE WIND SPEED AND DIRECTION……………9.0 N
ASOS……………………8.9
DAVIS…………………..7.9 NNW [330 Deg.] * Last of several occurrences.

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.10
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.81  DEPARTURE……+0.07
ASOS…………..4.01
TOTAL PRECIPITATION FOR THE YEAR……….16.39  DEPARTURE……-1.35
ASOS………….17.02

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.1
TOTAL SNOWFALL FOR THE MONTH……………15.0  DEPARTURE……+12.1
TOTAL SNOWFALL FOR THE SEASON…………..57.5  DEPARTURE…….-5.6

PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

4/1  66/54/60/+19/…./0.0/092/12          39 SSW AERO N/A    RMY 43
4/2  54/40/47/+6/…./0.0/023/03           23 SSW AERO N/A    RMY N/A
4/3  40/23/32/-10/…./7.7/354/46          46 W   AERO N/A    RMY 55
4/4  28/21/25/-17/0.68/7.3/000/00          29 NNE AERO N/A    RMY 25
4/5  35/19/27/-16/0.00/0.0/660/85          25 NW  AERO N/A    RMY 27
4/6  41/21/31/-12/…./0.0/483/62          44 S   AERO N/A    RMY N/A
4/7  56/41/49/+6/…./0.0/000/00           53 SSE AERO 59 SSE RMY 55
4/8  52/32/42/-2/T/0.0/353/45              41 WSW AERO 45 WSW RMY 42
4/9  47/29/38/-6/0.00/0.0/417/53           33 NW  AERO 39 NW  RMY 32
4/10 49/26/38/-7/0.01/0.0/735/93           30 NW  AERO 32 NW  RMY 31
4/11 58/40/49/+4/0.00/T/182/23             47 S   AERO 52 S   RMY N/A
4/12 59/37/48/+3/0.30/0.0/040/05           53 S   AERO 60 S   RMY 54
4/13 53/33/43/-3/0.00/0.0/798/100          21 NNW AERO 25 NNW RMY 21
4/14 48/33/41/-5/0.00/0.0/793/99           28 ENE AERO 28 NNE RMY 26
4/15 54/35/45/-2/0.00/0.0/804/100          26 NNE AERO 28 NNE RMY N/A
4/16 52/39/46/-1/0.00/0.0/783/97           36 NNE AERO 31 NNE RMY 34
4/17 62/36/49/+2/0.00/0.0/809/100          20 NNE AERO 20 NNE RMY 19
4/18 67/45/56/+8/…/0.0/715/88            28 ENE AERO 29 NE  RMY 28
4/19 55/41/48/0/…/0.0/440/54             25 NW  AERO 30 NW  RMY N/A
4/20 57/41/49/0/0.00/0.0/801/98            29 NNW AERO 30 NNW RMY 29
4/21 76/38/57/+8/0.00/0.0/795/97           28 W   AERO 29 WSW RMY 28
4/22 80/56/68/+19/…./…/..              36 S   AERO 37 S   RMY 36
4/23 60/46/53/+3/…./…/…/..           26 NNW AERO 60 NNW RMY 24
4/24 59/38/49/-1/0.00/0.0/…/..           23 NW AERO 25 NW RMY 24

4/25 low temp since midnight is 41F; normal now 41F

DAILY RECORDS FOR APRIL 2016

4/1/16: NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 54F,
BREAKS PREVIOUS RECORD OF 51F SET IN 1948

4/4/16: NEW DAILY RECORD SNOWFALL OF 7.3 INS,
BREAKS PREVIOUS RECORD OF 3.7 INS SET IN 1975

4/4/16: NEW DAILY RECORD LOW MAXIMUM TEMPERATURE OF 28F,
BREAKS PREVIOUS RECORD OF 32F SET AND TIED IN 1896, 1908, 1975

4/22/16: NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 56F,
BREAKS PREVIOUS RECORD OF 55F IN 1977 AND 1992

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

RECORDS FOR APRIL 25
HIGH 83 IN 2009
LOW 24 IN 1892
PRECIP 1.38 IN. IN 1901
SNOWFALL 0.7 IN. IN 2002.
PEAK GUST 66 MPH SE IN 1968

RECORDS FOR APRIL 26
HIGH 88 IN 2009
LOW 23 IN 1919
PRECIP 1.64 IN. IN 1931
SNOWFALL 1.0 IN. IN 2000
PEAK GUST 53 MPH SSW IN 1996

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle