Sunday, May 18, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MAY 18, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

ANOTHER VERY NICE DAY TODAY

It has been another pleasant day today, with seasonable
temperatures and dry air.  There was been plenty of sunshine
this morning, but numerous cumulus and stratocumulus clouds have
bubbled up during the late morning and afternoon.  No showers
have been produced so far, however.  The wind has been light
and variable for most of the day, alternating between a light NW
breeze and an easterly sea breeze.  It was a cool start, with
the temperature dropping to a low of 47F, and the combination of
cloudiness and an occasional sea breeze has only allowed the
temperature to rise to 66F for a high so far, which is very close
to average.  Visibility has been in the 65-70 mile range today.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, few cumulus fractus all quadrants, cumulus
distant SW-NNW, few moderate cumulus W-NW, altostratus distant offshore NE-E,
few altocumulus lenticularis NE-E, altocumulus castellanus ENE-E
Temperature: 52F; Dew Point: 41F; Wind: NW at 7 kts
Sea-level pressure: 30.11 ins. Hg, rising then rising more slowly
Visibility: 65 miles, except 40 miles NE-ENE, light distant haze
6-hr max temp: 51F
6-hr min temp: 47F
24-hr precip: Trace
BHO SA 1155 100 SCT 65 198/52/41/3207/011/ FEW CUFRA ALQDS CU DSNT SW-NNW
FEW MDT CU W-NW AS DSNT OFFSHR NE-E FEW ACSL NE ACC ENE-E LGT DSNT HZ
VSBY NE-ENE 40/ 8/280 51013 MANUAL 7000/ 10051 20047

10 A.M.
Weather: Scattered stratocumulus cumulogenitus, few altocumulus and
altostratus distant offshore NE-E
Temperature: 62F; Dew Point: 44F; Wind: NW at 5 kts,
Wind: Light and variable
Sea-level pressure: 30.11 ins. Hg, rising then falling
Visibility: 65 miles, light distant haze
BHO SA 1455 35 SCT 65 195/62/44/3105/011/ FEW AC AND AS DSNT OFFSHR NE-E
LGT DSNT HZ WND LGT AND VRB/ 8/470 58003

1 P.M.
Weather: Broken cumulus and moderate cumulus, few altocumulus cumulogenitus
Temperature: 64F; Dew Point: 43F; Wind: NE at 2 kts,
Wind: Light and variable
Sea-level pressure: 30.06 ins. Hg, falling then falling more rapidly
Visibility: 70 miles, light distant haze
6-hr max temp: 66F
6-hr min temp: 52F
BHO SA 1755 E55 BKN 70 180/64/43/0402/006/ FEW ACCG LGT DSNT HZ
WND LGT AND VRB/ 8/260 58015 10066 20052

WEATHER SUMMARY FOR SATURDAY, MAY 17, 2014

TEMPERATURE (DEGREES F)
MAX…..74    NORMAL…..67
MIN…..52    NORMAL…..48
MEAN….63    NORMAL…..57

DEPARTURE FROM 30-YEAR NORMAL…………………….+6
TOTAL DEPARTURE FOR THE MONTH…………………….+71 [+4.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………2  DEPARTURE……….-6
TOTAL HEATING UNITS FOR THE MONTH………….110  DEPARTURE………-67
TOTAL HEATING UNITS FOR THE SEASON………..6281  DEPARTURE………+69
TOTAL HEATING UNITS LAST SEASON TO DATE……5663  DIFFERENCE…….+618

COOLING DEGREE DAYS (SEASON JUN-OCT)
TOTAL COOLING UNITS FOR YESTERDAY…………..0   DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH………….13   DEPARTURE……….+7
TOTAL COOLING UNITS FOR THE SEASON…………13   DEPARTURE……….+5
TOTAL COOLING UNITS LAST SEASON TO DATE……..3   DIFFERENCE……..+10

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………36  SSE  AT  4:02 A.M. *
ASOS…………………..40  S    AT  2:45 A.M.
DAVIS………………….40  S    AT  2:45 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………..30  S    AT  5:50 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..28  S    AT  5:48 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….28  SSE  AT  4:03 A.M.
AVERAGE WIND SPEED AND DIRECTION………….14.4 WSW
ASOS………………….13.2
DAVIS…………………13.2 SSW [211 deg] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…Trace  DEPARTURE………….-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.96  DEPARTURE………….-0.12
ASOS…………..1.99
TOTAL PRECIPITATION FOR THE YEAR……….21.08  DEPARTURE………….+0.45
ASOS………….21.52

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…………..85.6  DEPARTURE………….+22.9

PRELIMINARY CLIMATE SUMMARY FOR MAY 2014 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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  64/43/54/+1/0.49/0.0/093/11          32 SSE RMY 36
5/2  68/51/60/+7/T/0.0/457/54             28 W   RMY 29
5/3  66/48/57/+4/0.00/0.0/332/39          21 SW  RMY N/A
5/4  60/47/54/0/0.01/0.0/400/47           51 WNW RMY 54
5/5  64/46/55/+1/T/0.0/592/70             30 NW  RMY 32
5/6  63/42/53/-1/T/0.0/506/59             30 NW  RMY 30
5/7  64/42/55/0/0.00/0.0/850/99           21 WNW RMY 23
5/8  69/48/59/+4/0.00/0.0/612/71          17 SSW RMY 19
5/9  57/51/54/-1/0.05/0.0/000/00          21 S   RMY N/A
5/10 78/57/68/+13/0.10/0.0/043/05         33 S   RMY 37
5/11 79/58/69/+13/0.01/0.0/746/86         30 W   RMY N/A
5/12 85/49/67/+11/0.00/0.0/792/91         39 NE  RMY 42
5/13 54/42/48/-8/0.00/0.0/113/13          32 NE  RMY N/A
5/14 73/42/58/+1/T/ 0.0/613/70            22 S   RMY 24
5/15 77/57/67/+10/T/0.0/140/16            27 S   RMY 33
5/16 73/60/67/+10/…./0.0/…/..         36 S   RMY 41
5/17 74/52/63/+6/…./0.0/…/..          36 SSE RMY N/A

5/18 morning low temp: 47F; the normal low is now 48F

DAILY RECORDS FOR MAY 2014
None so far.

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

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

RECORDS FOR MAY 19
HIGH 91F IN 1962
LOW 34F IN 2002
PRECIP 1.54 INCHES IN 1900
PEAK GUST 58 MPH NW IN 1964

TODAY’S REPORT PREPARED BY: Jonathan O’Brien