Saturday, May 16, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, MAY 16, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

QUICK RAIN SHOWER THIS MORNING BEFORE OVERCAST SKIES SET IN

Some very light rain began just after the 7:00 AM EST observation.
Since then, clouds have become fully overcast with some breaks for
sunshine seen. Precipitation continues to fall behind for the
month as dry conditions prevail leaving us just over 2 inches less
rainfall than usual.

By the 1:00 PM EST observation, overcast conditions had
continued, with a maximum reading of 72F and dew points near 50.

Another brief shower occurred at 2:25 PM EST, bringing just a
trace of rain.

Today’s Observations:

7 A.M.
Weather: Scattered Cumulus and Nimbostratus,
Overcast Altocumulus
Temperature: 57F; Dew Point: 49F; Wind: S at 8 kts
Sea-level pressure: 30.23 ins. Hg, rising then more slowly
Visibility: 35 miles, Hazy
6-hr Max temp: 57F
6-hr Min temp: 53F
24-hr precip: none
BHO SA 1155 50 SCT E90 OVC 35 238/57/49/1908/023/ BINOVC
ALQDS HAZY RW NW-N MVNG ESE/ 8/87/ 51008  10057 20053

10 A.M.
Weather: Overcast Cumulus and Stratocumulus
Temperature: 67F; Dew Point: 50F; Wind: S at 9 kts
Sea-level pressure: 30.23 ins. Hg, about steady
Visibility: 45 miles, distant haze
BHO SA 1455 E55 OVC 45 238/67/50/1909/023/ LGT DSNT HZ ALQDS/
8/8// 58000

1 P.M.
Weather: Overcast Stratus
Temperature: 72F; Dew Point: 49F; Wind: S at 12 kts,
Sea-level pressure: 30.19 ins. Hg, falling steadily
Visibility: 30 miles, hazy
6-Hr Max temp: 72F
6-Hr Min temp: 57F
BHO SA 1755 E45 OVC 30 226/72/49/1912/019/ HAZY ALQDS/
8/6// 57012 10072 20057

SUMMARY FOR FRIDAY, MAY 15, 2015

TEMPERATURE (DEGREES F)
MAX…..73   NORMAL…..66
MIN…..51   NORMAL…..48
MEAN….62   NORMAL…..57

DEPARTURE FROM 30-YEAR NORMAL…………………..+5
TOTAL DEPARTURE FOR THE MONTH………………….+96 [+6.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………3  DEPARTURE………..-6
TOTAL HEATING UNITS FOR THE MONTH…………..72  DEPARTURE……….-88
TOTAL HEATING UNITS FOR THE SEASON………..6343  DEPARTURE………+148
TOTAL HEATING UNITS LAST SEASON TO DATE……6279  DIFFERENCE………+66

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..0   DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH………….16   DEPARTURE………+11
TOTAL COOLING UNITS FOR THE SEASON…………16   DEPARTURE………+19
TOTAL COOLING UNITS LAST SEASON TO DATE……..9   DIFFERENCE………+7

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………20 WSW   AT  11:58 P.M.
ASOS…………………..20 SW    AT  11:29 P.M.
DAVIS………………….19 WNW   AT  12:52 P.M. RMY 21
FASTEST MILE FOR YESTERDAY………………..15 SSW   AT  11:38 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..16 SSW   AT  11:53 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….14 SSW   AT  11:36 P.M.
AVERAGE WIND SPEED AND DIRECTION………….7.1 WSW
ASOS………………….8.0
DAVIS…………………6.0 WSW [246 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………..0.27  DEPARTURE…..-1.56
ASOS……………0.23
TOTAL PRECIPITATION FOR THE YEAR………..18.19  DEPARTURE…..-2.06
ASOS…………….N/A ***
*** ASOS annual totals 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……………..0.0  DEPARTURE……0.0
TOTAL SNOWFALL FOR THE SEASON…………..150.8  DEPARTURE….+88.1

PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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  52/37/45/-8/0.00/0.0/354/42               21 NE  RMY 20
5/2  63/35/49/-4/0.00/0.0/668/79               20 S   RMY 20
5/3  74/44/59/+6/0.00/0.0/509/60               22 S   RMY 22
5/4  83/47/65/+11/0.00/0.0/783/92              39 SSW RMY 45
5/5  77/56/67/+13/0.03/0.0/222/26              29 SW  RMY N/A
5/6  74/54/64/+10/0.00/0.0/574/67              24 SSW RMY 25
5/7  84/52/68/+13/0.00/0.0/824/96              29 S   RMY 32
5/8  74/44/59/+4/0.00/0.0/809/94               27 NNE RMY 26
5/9  77/44/61/+6/0.00/0.0/509/59               30 S   RMY 32
5/10 88/60/74/+19/0.00/0.0/692/80              28 SSW RMY 30
5/11 84/48/66/+10/0.00/0.0/529/61              30 NE  RMY 31
5/12 84/47/66/+10/0.24/0.0/287/33              33 WNW RMY 37
5/13 67/47/57/+1/0.00/0.0/820/94               31 WNW RMY N/A
5/14 70/44/57/+0/0.00/0.0/…/..               22 NW  RMY 22
5/15 73/51/62/+5/0.00/0.0/…/..               20 WSW RMY 21

5/16 low since midnight is 53F; normal low now 48F

DAILY RECORDS FOR MAY 2015

NONE SO FAR

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

RECORDS FOR MAY 16
HIGH 90F IN 1951
LOW 30F IN 1936
PRECIP 2.63 INCHES IN 1954
PEAK GUST 56e MPH NW IN 1952

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

TODAY’S REPORT PREPARED BY: Robert Millette/Mike Iacono