Wednesday, August 21, 2013
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, AUGUST 21, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME
TEMPERATURE REACHES MID 80S;
WARMEST DAY SINCE ONE MONTH AGO, 93F ON JULY 20
AND YESTERDAY WAS ONLY 2ND WARMER THAN NORMAL DAY SINCE JULY 24
Temperatures finally warmed up to 85F yesterday and was 6 degrees
above the normal maximum for the date of 79F. This was the
largest departure in the maximum temperature since +12 degrees
on July 20 when the high reading reached 93 degrees at the
end of our six day heat wave.
From July 25 – August 19 (26 days), only 2 days had above normal
temperatures, and the average daily temperature during this time period
was 2.7F below normal.
Temperatures today continue to be in the middle 80’s this afternoon, which
would mark the first time this month that two consecutive days have been
above normal. Throughout the day the humidity has increased, with dew points
becoming slightly uncomfortable in the middle 60’s.
Winds continue to be on the light side, as they have been over the past
several days. The wind direction has slowly shifted from a NW direction
early this morning to a SW direction this afternoon. The sky cover has been
unusually clear, though hazy conditions has kept the visibility to only 15-
20 miles.
Today’s Observations:
7 A.M.
Weather: Clear, perfectly clear, [SKC], hazy aloft
all quadrants
Temperature: 69F; Dew Point: 61F; Wind: WNW at 6 kts.
Sea-level pressure: 30.16 ins. Hg, rising steadily
Visibility: 12 miles, hazy, thn fog below dissipating
inversion all quadrants
6-hr min. temp: 65F
BHO SA 1155 CLR 12 212/69/61/2906/016/ SKC INVSN DSSPTNG
THN F BLO/HAZY ALQDS/ 52009 10069 20065
10 A.M.
Weather: Clear, sky perfectly clear, [SKC] haze aloft
Temperature: 79F; Dew Point: 64F; Wind: SW at 4 kts,
Wind: Light
Sea-level pressure: 30.15 ins. Hg, falling slightly
Visibility: 15 miles, WNW 20 miles, hazy
BHO SA 1455 CLR 15 211/79/64/2304/015/ SKC HZ ALF VSBY WNW 20
HAZY ALQDS WND LGT/ 58001
1 P.M.
Weather: Clear, small cumulus fractus, cumulus all quadrants
Temperature: 85F; Dew Point: 62F; Wind: WSW at 6 kts,
Wind: Light
Sea-level pressure: 30.12 ins. Hg, falling steadily
Visibility: 20 miles, except 25 miles WNW, hazy
6-hr max. temp: 87F
BHO SA 1755 CLR 20 201/85/62/2406/012/ FEW SML CUFRA/CU
VSBY WNW 25 HAZY ALQDS WND LGT/ 8/100 58010 10087 20069
WEATHER SUMMARY FOR TUESDAY, AUGUST 20, 2013
TEMPERATURE (DEGREES F)
MAX…..85 NORMAL…..79
MIN…..64 NORMAL…..62
MEAN….75 NORMAL…..70
DEPARTURE FROM 30-YEAR NORMAL…………………..+5
TOTAL DEPARTURE FOR THE MONTH………………….-40 [-2.2 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………10 DEPARTURE………+4
TOTAL COOLING UNITS FOR THE MONTH…………89 DEPARTURE……..-44
TOTAL COOLING UNITS FOR THE SEASON……….572 DEPARTURE……..+88
TOTAL COOLING UNITS LAST SEASON TO DATE…..637 DIFFERENCE…….-65
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY…………….17 NW AT 5:13 A.M. *
AERO…………………18 NW AT 5:13 A.M.
ASOS…………………18 NW AT 5:11 A.M.
DAVIS………………..17 WNW AT 4:58 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………14 NW AT 4:52 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………14 NW AT 5:15 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………..13 NW AT 5:11 A.M.
AVERAGE WIND SPEED AND DIRECTION………..8.2 W
ASOS………………..8.2
DAVIS……………….7.3 W [280]
* last of several occurrences…
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M… 0.00 DEPARTURE…………-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.55 DEPARTURE…………-0.20
ASOS…………..2.60
TOTAL PRECIPITATION FOR THE YEAR……….37.84 DEPARTURE…………+4.10
ASOS…………..N/A*
*ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals
PRELIMINARY CLIMATE SUMMARY FOR AUGUST 2013 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
RMY: RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
8/1 81/62/72/0/0.01/503/58 25 S AERO 26 MPH S RMY 27
8/2 81/62/72/0/0.23/518/60 26 W AERO 26 MPH W RMY 28
8/3 77/63/70/-2/T/276/32 22 WSW AERO 23 MPH WSW RMY 23
8/4 79/58/69/-3/T/645/75 25 WNW AERO 21 MPH WNW RMY 26
8/5 75/54/65/-7/0.00/858/100 26 WNW AERO 25 MPH WNW RMY 27
8/6 78/56/67/-5/0.00/846/99 17 ESE AERO 15 MPH S RMY 16
8/7 80/59/70/-2/0.00/759/89 21 S AERO 21 MPH S RMY N/A
8/8 79/62/71/-1/0.08/153/18 25 S AERO 25 MPH S RMY N/A
8/9 73/70/72/0/2.21/000/00 37 S AERO 39 MPH S RMY 40
8/10 81/61/71/-1/0.00/795/94 30 WNW AERO 31 MPH WNW RMY 31
8/11 78/58/68/-3/0.00/835/99 18 W AERO 18 MPH W RMY 21
8/12 81/62/72/+1/0.00/656/78 18 W AERO 17 MPH WSW RMY 19
8/13 73/64/69/-2/0.02/193/23 16 SSE AERO 15 MPH SSE RMY N/A
8/14 73/57/65/-6/0.00/819/98 35 W AERO 35 MPH W RMY 35
8/15 75/53/64/-7/0.00/808/97 23 W AERO 23 MPH W RMY 24
8/16 77/57/67/-4/0.00/740/89 20 W AERO 19 MPH W RMY 21
8/17 77/59/68/-3/0.00/770/93 18 W AERO 18 MPH W RMY N/A
8/18 80/62/71/0/T/231/28 16 SSW AERO 17 MPH SSW RMY 18
8/19 82/58/70/0/T/…/.. 17 W AERO 18 MPH W RMY 20
8/20 85/64/75/+5/0.00/…/.. 17 NW AERO 18 MPH NW RMY N/A
8/21 morning low temp: 65F; the normal low is now 61F
DAILY RECORDS FOR AUGUST 2013
None so far.
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR AUGUST 21
HIGH 92F IN 1937, 1995
LOW 47F IN 1982
PRECIP 2.84 INCHES IN 1888
PEAK GUST 54 MPH WSW IN 2004
RECORDS FOR AUGUST 22
HIGH 90F IN 1939
LOW 42F IN 1894
PRECIP 2.28 INCHES IN 1935
PEAK GUST 44 MPH SSW IN 1987
TODAY’S REPORT PREPARED BY: Robert Skilling, Mark Medlinskas, Marc Douglas
