Friday, May 15, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, MAY 15, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

DRY CONDITIONS CONTINUE, TEMPS INTO THE 70S BY AFTERNOON

High cirrus at this morning’s 7:00 AM EST observation were
quick to thicken to a thin layer of cirrostratus, with
otherwise dry conditions found once again today. Precipitation
for the month is now down to 1.44 inches below normal,
and 1.94 inches below normal for the year.

By the 1:00 PM EST observation, overcast conditions had
continued, with a maximum reading of 71F. Relative humidity
had fallen to 20 percent with dew points in the upper 20s.

Today’s Observations:

7 A.M.
Weather: Thin broken cirrus
Temperature: 58F; Dew Point: 34F; Wind: estimated NW at 6 kts
Wind Speed: Light
Sea-level pressure: 30.32 ins. Hg, rising then more slowly
Visibility: 60 miles, distant haze
6-hr Max temp: 58F
6-hr Min temp: 51F
24-hr precip: none
BHO SA 1155 E250 -BKN 60 267/58/34/E3106/032/ LGT DSNT HZ ALQDS
WND LGT/ 8/001 51010 10058 20051

10 A.M.
Weather: Overcast cirrostratus
Temperature: 68F; Dew Point: 35F; Wind: estimated WSW at 4 kts
Wind Speed and Direction: Light and Variable
Sea-level pressure: 30.31 ins. Hg, about steady
Visibility: 60 miles, distant haze
BHO SA 1455 E220 OVC 60 264/68/35/E2504/031/ LGT DSNT HZ ALQDS
WND LGT AND VRB/ 8/007 55003

1 P.M.
Weather: Overcast cirrostratus
Temperature: 70F; Dew Point: 28F; Wind: estimated WSW at 6 kts,
Wind: Light and variable
Sea-level pressure: 30.26 ins. Hg, falling steadily
Visibility:  60 miles, light distant haze
6-Hr Max temp: 71F
6-Hr Min temp: 57F
BHO SA 1755 E200 OVC 60 247/70/28/E2506/026/ LGT DSNT HZ ALQDS
WND LGT AND VRB/ 8/007 57017 10071 20057
SUMMARY FOR THURSDAY, MAY 14, 2015

TEMPERATURE (DEGREES F)
MAX…..70   NORMAL…..66
MIN…..44   NORMAL…..47
MEAN….57   NORMAL…..57

DEPARTURE FROM 30-YEAR NORMAL…………………..+0
TOTAL DEPARTURE FOR THE MONTH………………….+91 [+6.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………8  DEPARTURE………..-1
TOTAL HEATING UNITS FOR THE MONTH…………..69  DEPARTURE……….-82
TOTAL HEATING UNITS FOR THE SEASON………..6340  DEPARTURE………+154
TOTAL HEATING UNITS LAST SEASON TO DATE……6279  DIFFERENCE………+61

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..0   DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH………….16   DEPARTURE………+12
TOTAL COOLING UNITS FOR THE SEASON…………16   DEPARTURE………+10
TOTAL COOLING UNITS LAST SEASON TO DATE……..9   DIFFERENCE………+7

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………22 NW    AT  12:22 P.M.
ASOS…………………..21 NW    AT   1:12 P.M.
DAVIS………………….22 WNW   AT  12:21 P.M. RMY 22
FASTEST MILE FOR YESTERDAY………………..15 WNW   AT  11:59 A.M.
WNWIMUM 2-MINUTE ASOS AVERAGE……………..16 NW    AT  12:01 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….14 WNW   AT  12:01 P.M.
AVERAGE WIND SPEED AND DIRECTION………….8.8 NW
ASOS………………….8.2
DAVIS…………………7.7 WNW [299 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…..-1.44
ASOS……………0.26
TOTAL PRECIPITATION FOR THE YEAR………..18.19  DEPARTURE…..-1.94
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/…/..               31 WNW RMY N/A
5/14 70/44/57/+0/0.00/0.0/…/..               22 NW  RMY 22

5/15 low since midnight is 51F; 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 15
HIGH 93F IN 1900
LOW 36F IN 1947,1985
PRECIP 1.63 INCHES IN 1978
PEAK GUST 53e MPH NE IN 1978, W 2002

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

TODAY’S REPORT PREPARED BY: Brian Fitzgerald