Thursday, May 11, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MAY 11, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
TEMPERATURES RISE SLIGHTLY, SKIES TURN
PARTLY CLOUDY FOR SOME AFTERNOON SUNSHINE
Morning skies turned mostly cloudy shortly after the
7:00AM EST observation but had returned to partly cloudy
with scattered cumulus and cirrus in time for the 1:00PM
ob. The extra sunshine helped temperatures reach 57F by
then, which is the warmest temperature recorded since
Sunday afternoon. Winds remain on the lower side with
gusts up to 18-20 MPH. Visibility also remained excellent
at 70 miles.
Today’s Observations:
7 A.M.
Weather: Scattered cumulus, scattered altocumulus
Temperature: 49F; Dew Point: 39F; Wind: NNE at 6G15 kts
Sea-level pressure: 30.01 ins. Hg, rising then steady
Visibility: 70 miles
6-hr Max temp: 49F
6-hr Min temp: 45F
24-hr precip: 0.00 in.
BHO SA 1155 44 SCT 74 SCT 70 163/49/39/0306G15/001/ 8/130 51009
10049 20045
10 A.M.
Weather: Two layers of broken stratocumulus
Temperature: 51F; Dew Point: 39F; Wind: NE at 8 kts
Sea-level pressure: 30.02 ins. Hg, steady then falling
Visibility: 70 miles
BHO SA 1455 E22 BKN 27 BKN 70 165/51/39/0408/002/ 8/500 51002
1 P.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 56F; Dew Point: 37F; Wind: NE at 9G15 kts
Sea-level pressure: 30.00 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 57F
6-hr Min temp: 49F
BHO SA 1755 49 SCT 240 SCT 70 159/56/37/0509G15/000/ 8/101 58006
10057 20049
SUMMARY FOR WEDNESDAY, MAY 10, 2017
TEMPERATURE (DEGREES F)
MAX…..57 NORMAL…..65
MIN…..42 NORMAL…..46
MEAN….50 NORMAL…..55
DEPARTURE FROM 30-YEAR NORMAL…………………….-5
TOTAL DEPARTURE FOR THE MONTH……………………-32 [-3.4 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..15 DEPARTURE……….+5
TOTAL HEATING UNITS FOR THE MONTH………….141 DEPARTURE………+28
TOTAL HEATING UNITS FOR THE SEASON………..5474 DEPARTURE……..-674
TOTAL HEATING UNITS LAST SEASON TO DATE……5158 DIFFERENCE…….+316
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….17 NNE AT 10:51 P.M.
AERO……………………16 NW AT 7:15 A.M.
ASOS……………………17 NE AT 10:45 P.M.
DAVIS…………………..14 NW AT 7:14 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………10 NNE AT 10:45 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………12 NNE AT 10:51 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..10 WNW AT 6:49 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..5.9 WNW
ASOS…………………..6.2
DAVIS………………….4.7 NW [310 deg.]
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……….1.22 DEPARTURE…….0.00
ASOS…………..1.27
TOTAL PRECIPITATION FOR THE YEAR……….22.03 DEPARTURE……+2.26
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings
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
M: Missing data
5/1 50/43/47/-6/T/…/.. 21 N AERO 18 N RMY 22
5/2 65/42/54/+1/0.26/…/.. 41 W AERO 44 W RMY 43
5/3 52/42/53/0/0.00/…/.. 37 WNW*AERO 39 WNW RMY 40
5/4 65/40/53/-1/0.00/…/.. 23 S AERO 23 S RMY 24
5/5 51/44/48/-6/0.73/…/.. 28 E AERO 28 E RMY N/A
5/6 65/50/58/+4/0.23/…/.. 46 SSE AERO 48 SSE RMY 49
5/7 63/47/55/0/T/…/.. 35 S AERO 38 S RMY 39
5/8 54/38/46/-9/T/…/.. 29 WSW AERO 29 WSW RMY 32
5/9 53/36/45/-10/T/…/.. 20 ESE AERO 17 ESE RMY 19
5/10 57/42/50/-5/0.00/…/.. 17 NNE AERO 16 MW RMY N/A
5/11 Low temp since midnight is 45F; normal low is now 46F
DAILY RECORDS FOR MAY
None so far.
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR MAY 11
HIGH 90F IN 1993
LOW 28F IN 1900
PRE 1.28 INS IN 1957
SNOW 1.0 INS IN 1907 (LATEST MEASURABLE SNOW ON RECORD)
PEAK GUST 75e MPH NW IN 1945
RECORDS FOR MAY 12
HIGH 88F IN 2001
LOW 29F IN 1907
PRECIP 1.49 INCHES IN 1968
PEAK GUST 76 MPH S IN 1974
TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle and Nicholas Rousseau
