BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, OCTOBER 7, 2012 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
EARLY EVENING COLD FRONTAL PASSAGE LEAVES BEHIND 0.20 INCH RAIN
COOL, DRY, AND OVERCAST BY AFTERNOON
 
A cold front passed through just after 6:00 PM EDT yesterday and left
behind 0.20 inch of rainfall. Temperatures dropped 10 degrees in only
one hour! The wind also shifted from SSW to WNW. A peak gust of 36 mph
was recorded during the frontal passage. Some nearby towns even observed
rumbles of thunder and some in cloud lightning.
 
Today, temperatures have been in the mid 50's with a low of 44F this
morning, the coldest since May 11th. Altostratus clouds are advancing
ahead of some expected showers later this afternoon and into tonight.
Some light raindrops were felt here shortly before 2:30 PM EDT.
 
 
Today's observations:
 
7 A.M.
Weather: Scattered cirrus, broken thin cirrus, few altocumulus standing
lenticularis distant E-SW, contrails all quadrants, distant haze
Temperature: 45F; Dew Point: 40F; Wind: WNW at 10 kts
Sea-level pressure: 30.06 ins. Hg, increasing
Visibility: 40 miles, distant haze
24-hour precip: 0.20 inch
6-hour min. temp: 44F
BHO SA 1155 200 SCT E250 –BKN 40 181/45/40/2910/006/ FEW ACSL DSNT E-SW
CONTRAILS ALQDS DSNT HZ/ 8/041 52020 ASOS 70019 MANUAL 70020 10047 20044
 
10 A.M. 
Weather: Broken altocumulus, broken cirrostratus, few lower altocumulus
and altocumulus standing lenticularis all quadrants, distant haze
Temperature: 54F; Dew Point: 40F; Wind: W at 3 kts,
Wind: Direction variable SW-NW
Sea-level pressure: 30.06 ins. Hg, decreasing slightly
Visibility: 60 miles, distant haze
BHO SA 1455 E140 BKN 200 BKN 60 179/54/40/2703/006/ FEW LWR AC/ACSL ALQDS
DSNT HZ WND 23V31/ 8/047 58002
 
1 P.M. 
Weather: Overcast altostratus, few cumulus distant W-NNW, few lower
altocumulus undulatus SE-SW, sun dimly visible, light distant haze, light
virga all quadrants
Temperature: 54F; Dew Point: 40F; Wind: WNW at 7 kts
Sea-level pressure: 30.05 ins. Hg, decreasing slightly
Visibility: 60 miles, light distant haze 
6-hour max. temp: 57F 
BHO SA 1755 E100 OVC 60 176/54/40/3007/005/ FEW CU DSNT W-NNW FEW LWR AC
UNDULATUS SE-SW SUN DMLY VSBL LGT DSNT HZ LGT VIRGA ALQDS VSBY LWR SSE-WSW
50/ 8/15/ 58003 10057 20045
 
 
WEATHER SUMMARY FOR SATURDAY, OCTOBER 6
 
TEMPERATURE (DEGREES F)
MAX.....77    NORMAL.....64
MIN.....48    NORMAL.....47
MEAN....63    NORMAL.....55
 
DEPARTURE FROM 30-YEAR NORMAL.....................+8
TOTAL DEPARTURE FOR THE MONTH....................+30 [+4.8 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............2    DEPARTURE........-8
TOTAL HEATING UNITS FOR THE MONTH............24    DEPARTURE.......-32
TOTAL HEATING UNITS FOR THE SEASON..........123    DEPARTURE.......-75
TOTAL HEATING UNITS LAST SEASON TO DATE.....121    DIFFERENCE.......+2
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............36 SSW AT  1:38 P.M. *
                   AERO..................37 SSW AT  1:09 P.M.
                   ASOS..................37 SSW AT  1:36 P.M.
                   DAVIS.................38 SSW AT 11:44 A.M. RMY 36
THE FASTEST MILE FOR YESTERDAY...........29 SSW AT 11:37 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............28 SSW AT  1:11 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........28 SSW AT 11:38 A.M.
AVERAGE WIND SPEED AND DIRECTION.......15.0 SSW
                   ASOS................14.2
                   DAVIS...............14.1 SW [219 deg]
* Last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.20   DEPARTURE...........+0.05
                         ASOS..............0.19
TOTAL PRECIPITATION FOR THE MONTH......... 0.42   DEPARTURE...........-0.47
                         ASOS..............0.37
TOTAL PRECIPITATION FOR THE YEAR..........29.04   DEPARTURE..........-10.93
                         ASOS.............28.92
 
PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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
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
 
10/1  66/47/57/0/T/.../..             36 W   AERO 35 MPH WSW RMY 36
10/2  69/53/61/+4/0.12/105/15         18 W   AERO 16 MPH W   RNT 16
10/3  62/58/60/+4/0.02/000/00         20 NE  AERO 18 MPH NE  RMY 18
10/4  61/58/60/+4/0.08/000/00         17 NNE AERO 14 MPH NE  RMY 14
10/5  75/57/66/+10/0.00/.../..        20 SW  AERO 19 MPH SW  RMY 21
10/6  77/48/63/+8/0.20/.../..         36 SSW AERO 37 MPH SSW RMY 36  TSTM
 
10/7 morning low temp: 44F; the normal low is now 46F
 
DAILY RECORDS FOR OCTOBER 2012
None so far.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR OCTOBER 7
HIGH 88F IN 1963 (RECORD FOR MONTH)
LOW 30F IN 1904,1986
PRECIP 1.75 INCHES IN 1972
PEAK GUST 54 W IN 2009
 
RECORDS FOR OCTOBER 8
HIGH 81F IN 1916,1990
LOW 28F IN 1919
PRECIP 2.31 INCHES IN 1891
SNOWFALL TRACE IN 1988, 2001 (EARLIEST DATE)
PEAK GUST 60 MPH NE IN 1996
 
TODAY'S REPORT PREPARED BY: George Tabeek/Peter Volpe
 
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