Tuesday, May 17, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, MAY 17, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDY SKIES, TEMPERATURES BACK TO NORMAL

Today started off with overcast cirrostratus and gradually shifted
to cirrus and cumulus clouds with a few altocumulus lenticularis
in the afternoon.  Temperatures were back to normal values after
a chilly couple days.  By the 1:00PM observation, the minimum
temperature was 47F, and the maximum temperature was 68F.

Today’s Observations:

7 A.M.
Weather: Overcast cirrostratus
Temperature: 54F; Dew Point: 33F; Wind: W at 13 kts
Sea-level pressure: 30.14 ins. Hg, rising, then more slowly
Visibility: 65 miles
6-hr Max temp: 54F
6-hr Min temp: 47F
24-hr precip: 0.00 in.
BHO SA 1155 E200 OVC 65 205/54/33/2713/014/ 8/007 51015 10054 20047

10 A.M.
Weather: Few cumulus W-NNE, overcast cirrostratus
Temperature: 61F; Dew Point: 37F; Wind: W at 12G23 kts
Sea-level pressure: 30.14 ins. Hg, rising, then falling
Visibility: 65 miles
BHO SA 1455 E200 OVC 65 206/61/37/2712G23/014/ FEW CU W-NNE/
8/107 50001

1 P.M.
Weather: Few altocumulus lenticularis, scattered cumulus,
broken cirrus
Temperature: 67F; Dew Point: 38F; Wind: WSW at 13G22 kts
Sea-level pressure: 30.10 ins. Hg, falling, then more quickly
Visibility: 65 miles
6-hr Max temp: 68F
6-hr Min temp: 54F
BHO SA 1755 69 SCT E250 BKN 65 192/67/38/2513G22/010/
FEW ACSL E/ 8/142 58014 10068 20054

SUMMARY FOR MONDAY, MAY 16, 2016

TEMPERATURE (DEGREES F)
MAX…..58   NORMAL…..66
MIN…..38   NORMAL…..48
MEAN….48   NORMAL…..57

DEPARTURE FROM 30-YEAR NORMAL……………………..-9
TOTAL DEPARTURE FOR THE MONTH…………………….-40 [-2.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..17   DEPARTURE……….+8
TOTAL HEATING UNITS FOR THE MONTH………….201   DEPARTURE………+32
TOTAL HEATING UNITS FOR THE SEASON………..5193   DEPARTURE…….-1010
TOTAL HEATING UNITS LAST SEASON TO DATE……6347   DIFFERENCE……-1154

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….45  W  AT  1:27 P.M.*
ASOS……………………48  W  AT 11:38 A.M.
DAVIS…………………..44  W  AT 10:10 A.M. RMY 49
FASTEST MILE FOR YESTERDAY…………………35  W  AT 11:37 A.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE………………36  W  AT 10:11 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..32 WNW AT 10:11 A.M.
AVERAGE WIND SPEED AND DIRECTION……………21.0 W
ASOS……………………20.3
DAVIS…………………..17.6 W [280 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.12
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.88  DEPARTURE……-0.07
ASOS…………..1.76
TOTAL PRECIPITATION FOR THE YEAR……….18.82  DEPARTURE……-1.65
ASOS………….18.76

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 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

5/1 52/39/46/-7/0.08/T/000/00               21 S   AERO 22 SE  RMY 20
5/2 50/41/46/-7/0.31/0.0/000/00             20 NE  AERO 21 NE  RMY 18
5/3 48/43/46/-7/0.16/0.0/000/00             16 E   AERO 16 E   RMY 17
5/4 48/41/45/-9/0.53/0.0/000/00             33 NE  AERO 35 NE  RMY 34
5/5 44/41/43/-11/0.30/0.0/000/00            39 NNE AERO 41 NNE RMY 39
5/6 54/43/49/-5/0.13/0.0/348/42             28 ENE AERO 29 N   RMY 26
5/7 51/43/47/-8/…/0.0/000/00              25 NE  AERO 25 NE  RMY 23
5/8 60/46/53/-2/…/0.0/276/33              47 W   AERO 53 W   RMY 49
5/9 65/43/54/-1/0.00/0.0/720/86             40 W   AERO 44 W   RMY 40
5/10 69/40/55/0/0.00/0.0/774/93             22 W   AERO 25 WNW RMY 22
5/11 76/50/63/0.00/0.0/790/93               22 WNW AERO 23 WNW*RMY 22
5/12 75/54/65/0.00/0.0/792/94               23 NNE AERO 25 S   RMY 23
5/13 74/52/63/+7/0.21/0.0/078/09            27 S   AERO 27 S   RMY 26
5/14 78/54/66/+9/0.00/0.0/…/..            35 SSW*AERO 40 SSW RMY 37
5/15 60/40/51/-6/0.00/0.0/…/..            50 W   AERO 54 W   RMY 49
5/16 58/38/48/-9/0.00/0.0/…/..            45 W*  AERO 51 WNW RMY 49

5/16 low temp since midnight is 47F; normal low now 48F

* Last of several occurrences

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 17
HIGH 88F IN 1974, 1977
LOW 34F IN 1956, 1957
PRECIP 2.07 INS IN 1916
PEAK GUST 52 MPH SW IN 1967, W IN 1974

RECORDS FOR MAY 18
HIGH 88F IN 1906, 1936, 1986
LOW 35F IN 2002
PRECIP 1.93 INS IN 2007
SNOW TRACE IN 2002 (Ice pellets)
PEAK GUST 64 MPH SSW IN 2000

TODAY’S REPORT PREPARED BY: Cece Borries-Strigle