Friday, May 6, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, MAY 6, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

SUNSHINE RETURNS AND TEMPERATURES INCREASE

Temperatures began to climb after yesterday evening’s
low temperature of 42F, but they are still below normal.
The maximum and minimum temps. by the 1:00PM EST observation
were 54F and 43F, respectively.  These average to a temp.
of 49F for the day, only 5F below average.

Precipitation at the 7:00AM EST observation measured
0.20 in.  Clouds cleared enough in the afternoon for
patches of blue skies to be seen.  Visibility persisted
near 70 miles at each observation.

BHO Snowiest April, inches (1886-2016):

1) 24.2 in 1996
2) 21.5 in 1894
3) 19.0 in 1887
4) 16.2 in 1916
5) 15.4 in 1907
6) 15.1 in 1997
7) 15.0 in 2016
8) 14.0 in 1982
9) 13.5 in 1987
10) 12.2 in 1917

PRELIMINARY STATS FOR APRIL 2016

TEMPERATURE, Deg. F
Avg. Max. 55.4 [-0.3] Avg. Min. 36.3 [-1.4] Mean      45.9 [-0.8] 24-hour corrected mean: 45.5
Max. for month: 80 on 22nd
Min. for month: 19 on 5th

HEATING DEGREE DAYS
Total heating units: 573 [+22] Total for the season: 4992 [-1043] Total for last season: 6271

PRECIPITATION, Inches
Total: 4.36 [-0.19] Greatest in 24 hrs: 1.41 on 7th

SNOWFALL, Inches
Total: 15.0 [+12.0] Greatest in 24 hrs: 7.7 on 3rd

WIND, mph
Avg. uncorrected wind speed: 11.9
Avg. corrected wind speed: 12.4
Prevailing wind direction: S at 17%
Peak gust and direction: 53 SSE on the 7th and 53 S on the 12th

SUNSHINE:
Campbell-Stokes card minutes: 13902 mins. of possible 23250 or 60%
Astronomical total minutes:   14436 mins. of possible 24145 or 60%

Today’s Observations:

7 A.M.
Weather: Broken stratocumulus
Temperature: 47F; Dew Point: 44F; Wind: NE at 10G19 kts
Sea-level pressure: 29.79 ins. Hg, rising, then more slowly
Visibility: 70 miles, except 50 miles WNW-SW, thin fog WNW-SW
6-hr Max temp: 47F
6-hr Min temp: 43F
24-hr precip: 0.20 in.
BHO SA 1155 E9 BKN 70 089/47/44/0410G19/979/ VSBY WNW-SW 50
THN FG WNW-SW/ 8/500 51027 ASOS 70020 MANUAL 70020 10047 20043

10 A.M.
Weather: Overcast stratocumulus
Temperature: 50F; Dew Point: 44F; Wind: NE at 9G16 kts
Sea-level pressure: 29.85 ins. Hg, rising, then more slowly
Visibility: 70 miles
BHO SA 1455 E14 OVC 70 110/50/44/0509G16/985/ 8/5// 51021

1 P.M.
Weather: Few cumulus in all directions, few cirrus WNW-ENE,
broken stratocumulus
Temperature: 52F; Dew Point: 42F; Wind: ENE at 13G22 kts
Sea-level Pressure: 29.88 ins. HG, rising, then more quickly
Visibility: 70 miles
6-hr Max temp: 54F
6-hr Min temp: 47F
6-hr Precip: 0 in.
BHO SA 1755 E17 OVC 70 117/52/42/0713G22/988/ FEW CU ALQDS
FEW CI WNW-ENE/ 8/501 53007 10054 20047

SUMMARY FOR THURSDAY, MAY 5, 2016

TEMPERATURE (DEGREES F)
MAX…..44   NORMAL…..63
MIN…..41   NORMAL…..45
MEAN….43   NORMAL…..54

DEPARTURE FROM 30-YEAR NORMAL…………………….-11
TOTAL DEPARTURE FOR THE MONTH…………………….-41 [-8.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..22   DEPARTURE………+10
TOTAL HEATING UNITS FOR THE MONTH…………..99   DEPARTURE………+39
TOTAL HEATING UNITS FOR THE SEASON………..5091   DEPARTURE…….-1004
TOTAL HEATING UNITS LAST SEASON TO DATE……6313   DIFFERENCE……-1222

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….39 NNE AT  3:14 P.M.
ASOS……………………39 NE  AT  4:42 P.M.
DAVIS…………………..37 NE  AT  3:14 P.M.  RMY 39
FASTEST MILE FOR YESTERDAY…………………25 NNE AT  2:38 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………25 NE  AT  2:38 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..24  N  AT  8:40 A.M.
AVERAGE WIND SPEED AND DIRECTION……………16.9 NE
ASOS……………………16.9
DAVIS…………………..14.7 NNE [020 Deg.] * last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.20  DEPARTURE……+0.07
ASOS…………..0.20
TOTAL PRECIPITATION FOR THE MONTH……….1.32  DEPARTURE……+0.50
ASOS…………..1.31
TOTAL PRECIPITATION FOR THE YEAR……….18.26  DEPARTURE……-1.11
ASOS………….18.31

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..0.0
TOTAL SNOWFALL FOR THE MONTH…………..TRACE  DEPARTURE……..0.0
TOTAL SNOWFALL FOR THE SEASON…………..57.5  DEPARTURE…….-5.7

PRELIMINARY CLIMATE SUMMARY FOR APRIL-MAY 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/+19/0.06/0.0/092/12          39 SSW AERO N/A    RMY 43
4/2  54/40/47/+6/0.47/0.0/023/03           23 SSW AERO N/A    RMY N/A
4/3  40/23/32/-10/0.85/7.7/354/46          46 W   AERO N/A    RMY 55
4/4  28/21/25/-17/0.63/7.3/000/00          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/T/0.0/483/62             44 S   AERO N/A    RMY N/A
4/7  56/41/49/+6/1.41/0.0/000/00           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/-7/0.00/0.0/735/93           30 NW  AERO 32 NW  RMY 31
4/11 58/40/49/+4/0.01/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/+8/0.00/0.0/715/88           28 ENE AERO 29 NE  RMY 28
4/19 55/41/48/0/0.05/0.0/440/54            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/+19/0.03/0.0/313/38          36 S   AERO 37 S   RMY 36
4/23 60/46/53/+3/0.19/0.0/289/35           26 NNW AERO 60 NNW RMY 24
4/24 59/38/49/-1/0.00/0.0/770/93           23 NW  AERO 25 NW  RMY 24
4/25 63/41/52/+2/0.00/0.0/158/19           23 W   AERO 24 W   RMY N/A
4/26 52/35/44/-7/0.36/0.0/000/00           33 E   AERO 35 E   RMY 31
4/27 61/33/47/-4/0.00/0.0/761/91           28 S   AERO 39 S   RMY 29
4/28 60/37/49/-3/0.00/0.0/670/80           26 S   AERO 30 S   RMY 27
4/29 56/40/48/-4/0.00/0.0/563/67           20 ESE AERO 22 SE  RMY 20
4/30 62/38/50/-2/0.00/0/0/835/99           24 S   AERO 24 S   RMY 25

5/1 52/39/46/-7/…/T/000/00               21 S   AERO 22 SE  RMY 20
5/2 50/41/46/-7/…/0.0/000/00             20 NE  AERO 21 NE  RMY 18
5/3 48/43/46/-7/…/0.0/000/00             16 E   AERO 16 E   RMY 17
5/4 48/41/45/-9/…/0.0/…/..             33 NE  AERO 35 NE  RMY 34
5/5 44/41/43/-11/…/0.0/…/..            39 NNE AERO 41 NNE RMY 39

5/6 low temp since midnight is 43F; normal low now 45F

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 RECORDS FOR MAY 2016

5/1/16: DAILY RECORD SNOWFALL OF A TRACE,
TIES PREVIOUS RECORDS SET IN 1905, 1917, 1921, and 1995

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

RECORDS FOR MAY 6
HIGH 90F IN 1930
LOW 29F IN 1891
PRECIP 1.04 INCHES IN 1890
SNOWFALL TRACE IN 1917,1996
PEAK GUST 65 MPH SSE IN 1989

RECORDS FOR MAY 7
HIGH 93F IN 1930
LOW 33F IN 1970
PRECIP 1.19 INCHES IN 2005
SNOWFALL TRACE IN 1967
PEAK GUST 66e MPH WNW IN 1940

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle