BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JULY 6, 2012 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
A PLEASANT DAY OF LOW HUMIDITY AS HAZY, HOT, AND HUMID CONDITIONS RETURN TOMORROW
WINDS NEAR CALM THE ENTIRE DAY
 
Today will mark the 9th straight day of above normal temperatures; a much different
start to the month when compared to June. The headline today is the lack of wind here
on the summit, as the peak wind for today is only 15 mph and the average wind speed is
only 5.7 mph! The last time the average wind speed was this low was actually about a
month from today (June 7th), where the average wind speed for that day was only 5.5 mph
corrected.
 
Aside from the wind, today started out clear, but has since become partly to mostly
cloudy with cumulus clouds passing over the Observatory. Humidity has dropped off a lot
since this morning, currently in the high 40s with dew points in the low 60s. Visibility
has been about average for today, with Grand Monadnock just barely visible out to the NW.
 
Hot and humid conditions return tomorrow as temperatures will reach the low to mid 90s in
most areas. Our daily maximum temperature of 97F (1908,1993) is in slight jeopardy
of being tied or surpassed tomorrow, however chances are that it won't be broken. A cold
front is expected to roll through tomorrow evening, bringing scattered thunderstorms to
most regions, where some have the potential of becoming severe.
 
 
Today's observations:
 
7 A.M.
Weather: Clear, faint altocumulus standing lenticularis band distant SSW-SW and NW-N,
thin smoke layer all quadrants, light distant haze
Temperature: 70F; Dew Point: 64F; Wind: WNW at 6 kts,
Wind: Light and variable
Sea-level pressure: 29.94 in Hg, increasing steadily
Visibility: 50 miles, 65 miles NW, thin smoke layer all quadrants, light distant haze
6-hour min. temp: 64F
BHO SA 1155 CLR 50 138/70/64/3006/994/ FAINT ACSL BAND DSNT SSW-SW AND NW-N THN K LYR
ALQDS LGT DSNT HZ VSBY HIER NW WND L/V 65/ 8/040 52017 10070 20064
 
10 A.M.
Weather: Scattered cumulus, scattered cirrus, few moderate cumulus all quadrants, few
lower dense cirrus SW-NW, light distant haze
Temperature: 80F; Dew Point: 66F; Wind: Calm
Sea-level pressure: 29.92 in Hg, decreasing then increasing 
Visibility: 55 miles, 65 miles NW, light distant haze
BHO SA 1455 35 SCT 200 SCT 55 133/80/66/0000/992/ FEW MDT CU ALQDS FEW LWR DNS CI SW-NW
LGT DSNT HZ VSBY HIER NW 65 WND CALM/ 8/203 55005
 
1 P.M.
Weather: Scattered cumulus, scattered cirrus (2 layers), few moderate cumulus all
quadrants, distant haze
Temperature: 86F; Dew Point 66F; Wind: Calm
Sea-level pressure: 29.90 in Hg, decreasing
Visibility: 50 miles, distant haze
6-hour max temp.: 86F
BHO SA 1755 50 SCT 200 SCT 250 SCT 50 124/86/66/0000/990/ FEW MDT CU ALQDS DSNT HZ WND
CALM/ 8/203 58009 10086 20070
 
WEATHER SUMMARY FOR THURSDAY, JULY 5
 
TEMPERATURE (DEGREES F)
MAX.....81    NORMAL.....80
MIN.....68    NORMAL.....62
MEAN....75    NORMAL.....71
 
DEPARTURE FROM 30-YEAR NORMAL.......................+4
TOTAL DEPARTURE FOR THE MONTH......................+25 [+4.8 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............23 NW  AT   6:03 A.M. *
                   AERO..................23 NW  AT   8:04 A.M. *
                   ASOS..................24 NNW AT   6:03 A.M.
                   DAVIS.................22 NNW AT   4:12 A.M. RMY 22
THE FASTEST MILE FOR YESTERDAY...........17 NW  AT   9:03 A.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE............17 NNW AT   4:16 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........16 NW  AT   4:09 A.M.
AVERAGE WIND SPEED AND DIRECTION........8.8 NW
                   ASOS.................8.3
                   DAVIS................8.1 NW [324 deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00   DEPARTURE...........-0.11
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........0.38   DEPARTURE...........-0.16
                         ASOS..............0.36
TOTAL PRECIPITATION FOR THE YEAR..........18.07   DEPARTURE...........-9.44
                         ASOS.............17.98
 
PRELIMINARY CLIMATE SUMMARY FOR JULY 2012 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
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
 
7/1  89/67/78/+8/0.01/..../..       33 WSW AERO 32 MPH WSW RMY 34
7/2  84/66/75/+5/T/..../..          23 W   AERO 22 MPH W   RMY 23
7/3  85/63/74/+3/0.00/.../..        23 W   AERO 21 MPH W   RMY 20
7/4  85/66/76/+5/0.37/.../..        20 W   AERO 20 MPH W   RMY 23
7/5  81/68/75/+4/0.00/.../..        23 NW  AERO 23 MPH NW  RMY 22
 
7/6 morning low temp: 64F; the normal low is now 62F
 
DAILY RECORDS FOR JULY 2012
None so far.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JULY 6
HIGH 99F IN 2010
LOW 47F IN 1979
PRECIP 1.43 INCHES IN 2005
PEAK GUST 56e MPH NNW IN 1942, 56 MPH WNW IN 1999
 
RECORDS FOR JULY 7
HIGH 97F IN 1908,1993
LOW 48F IN 1902
PRECIP 2.11 INCHES IN 1966
PEAK GUST 55 MPH NW IN 1989
 
TODAY'S REPORT PREPARED BY: George Tabeek
 
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