Saturday, May 10, 2014
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, MAY 10, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME
WARM, MOSTLY CLOUDY DAY ON THE SUMMIT
Today has been a bit of a summer preview day. The temperature rose
throughout last night as a surge of warm air has been moving into the region.
By the 7:00 A.M. observation, the temperature had risen to 63F from 57F at
midnight. After leveling out for a couple hours, the rise in temperature
began again, and we had reached 76F by 1:00 P.M. Some rainfall has preceded
this surge of warm air, adding up to only 0.08 inches between yesterday and
today. While this morning’s showers tapered off fairly early, low and mid
level clouds stuck around for the whole morning. By early afternoon, clouds
did begin to break a little, and our first sunshine since Thursday was
observed, which has helped propel temperatures into the 70s. The humidity
has been noticeable as well, with dew points in the low 60s today. Winds
have been light to moderate, mostly out of the SW, which is helping to bring
in this warm and more humid air. A few gusts over 30mph occurred last night.
While we are enjoying warmth typical of June today, that wasn’t the case
37 years ago today. Yesterday and today mark the 37th anniversary of the
remarkable May 9-10 snowstorm of 1977. A total of 7.8 inches of snow fell
on the summit during that storm, with much more recorded in parts of western
New England.
Today’s Observations:
7 A.M.
Weather: Light rain shower, sky obscured by fog, stratus fractus drifting
below the summit
Temperature: 63F; Dew Point: 62F; Wind: S at 13G25 kts
Sea-level pressure: 29.90 ins. Hg, falling then rising slightly
Visibility: 1/4 miles, dense fog
6-hr max temp: 63F
6-hr min temp: 58F
24-hr precip: 0.07 inches
BHO SA 1155 W3 X 1/4RW-F 125/63/62/1813G25/990/ STFRA DRFTNG BLO SMT/ 8////
55011 MANUAL 70007 ASOS 70006 60001 10063 20058
10 A.M.
Weather: Broken stratus, overcast altocumulus, thin fog all quadrants,
Sun dimly visible
Temperature: 64F; Dew Point: 61F; Wind: SSW at 8 kts
Sea-level pressure: 29.88 ins. Hg, falling slightly
Visibility: 8 miles, thin fog
3-hour precip: 0.01 inch
BHO SA 1455 E10 BKN 95 OVC 8 118/64/61/2108/988/ THN F ALQDS SUN DMLY VSBL/
8/65/ 55007 MANUAL 60001 ASOS 60001
1 P.M.
Weather: Scattered altocumulus, broken cirrostratus, overcast cirrus,
few cumulus distant SW-N, few lower altocumulus mostly E-SE, few
cirrocumulus SW-W
Temperature: 75F; Dew Point: 59F; Wind: W at 9 kts
Sea-level pressure: 29.84 ins. Hg, falling
Visibility: 40 miles, distant haze
6-hr max temp: 76F
6-hr precip: 0.01 inch
BHO SA 1755 100 SCT E200 BKN 250 OVC 40 106/75/59/2609/984/ FEW CU DSNT SW-N
FEW LWR AC MSTLY E-SE FEW CC SW-W DSNT HZ/ 8/156 57012 MANUAL 60001
ASOS 60001 10076 20061
WEATHER SUMMARY FOR FRIDAY, MAY 9, 2014
TEMPERATURE (DEGREES F)
MAX…..57 NORMAL…..64
MIN…..51 NORMAL…..46
MEAN….54 NORMAL…..55
DEPARTURE FROM 30-YEAR NORMAL……………………..-1
TOTAL DEPARTURE FOR THE MONTH…………………….+15 [+1.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..11 DEPARTURE……….+1
TOTAL HEATING UNITS FOR THE MONTH…………..84 DEPARTURE………-19
TOTAL HEATING UNITS FOR THE SEASON………..6255 DEPARTURE……..+117
TOTAL HEATING UNITS LAST SEASON TO DATE……5607 DIFFERENCE…….+648
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………21 S AT 10:56 P.M.
ASOS…………………..22 S AT 10:56 P.M.
DAVIS………………….21 S AT 10:27 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………. 17 S AT 11:34 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..17 S AT 11:34 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….16 SSE AT 9:16 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..6.4 SSE
ASOS…………………..6.9
DAVIS………………….5.7 SSE [152 deg]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.07 DEPARTURE………….-0.04
ASOS…………..0.06
TOTAL PRECIPITATION FOR THE MONTH……….0.57 DEPARTURE………….-0.53
ASOS…………..0.57
TOTAL PRECIPITATION FOR THE YEAR……….19.69 DEPARTURE………….+0.04
ASOS………….20.10
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/…./0.0/332/39 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/…/.. 21 WNW RMY 23
5/8 69/48/59/+4/0.00/0.0/…/.. 17 SSW RMY 19
5/9 57/51/54/-1/…./0.0/000/00 21 S RMY N/A
5/10 morning low temp: 57F; the normal low is now 46F
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 10
HIGH 93F IN 1896
LOW 29F IN 1900
PRE 1.85 INS IN 1998
SNOW 2.8 INS 1977 (7.8 INS TOTAL 5/9-5/10 1977)
PEAK GUST 64 MPH S IN 1990
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
TODAY’S REPORT PREPARED BY: Jonathan O’Brien
