BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, SEPTEMBER 5, 2012 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
OPPRESSIVE HUMIDITY CONTINUES OVERNIGHT INTO TODAY
DEW POINTS RISE OVERNIGHT INTO LOW 70'S TO 73F
OVERNIGHT LOW TEMP. VERY WARM AT 71F
RAINFALL TOTAL REACHES HALF INCH PAST 24 HOURS
 
Occasional rain showers which began early yesterday morning have
continued off and on over the past 24 hours. The total rainfall
since rain began was 0.60 inch as of 8 A.M. EDT this morning.
An additional 0.11 inch fell later in the morning in mostly
light showers with a couple of thunderstorms.  Conditions
continued very humid with dew points of 72F to 73F recorded. 
 
Today's observations:
 
7 A.M.
Weather: Overcast stratus fractus, ceiling ragged, stratus drifting
over and below summit, light rain shower occurring, ended 0600E began
0605E ended 0615E, began 0650E continued
Temperature: 73F; Dew Point: 73F; Wind: SSW at 17 kts.
Wind: Peak wind from SSW @ 29 kts at 0603E
Sea-level pressure: 30.12 ins. Hg, falling
Visibility: 2 miles, variable 1.5 to 2.5 miles, occasionally lower,
light rain shower and fog
24-hour precip: 0.51 inch
6-hour precip: 0.20 inch (ASOS)
6-hour min. temp: 72F
BHO SA 1155 E4 OVC 2VRW-F 083/73/73/2117/978/ CIG RGD STRA DRFTG OVR 
AND BLO SMT VSBY 11/2V21/2 OCNL LWR PK WND 2029/03/ RE00B05E15B50/
8/7// 55001 10073 20072 ASOS 60020 MANUAL 6020/ ASOS 70051 MANUAL 70051 
10073 20072
 
10 A.M.
Weather: Thunderstorm, light rain shower, thunderstorm SE-S moving
east, occasional lightning cloud to cloud, in cloud and cloud to ground,
precipitation very light, break in overcast NW-N  
Temperature: 74F; Dew Point: 73F; Wind: SW @ 15G23 kts,
Wind: Peak wind from SW @ 29 kts, 0903E
Sea-level pressure: 29.75 ins. Hg, falling then more slowly
Visibility: 2.5 miles light rain and fog, miles, 3 miles E
3-hour precip: 0.09 in.
BHO SA 1455 7 SCT 22 SCT 100 SCT E200 OVC 21/2TRW-F 076/74/2215G23/975/
TS SE-S MOVG E OCNL LTGICCCCG SSE-SSW TCU N BRGHT SPTS IOVC BINOVC NW-N AC 
CHAOTIC DNS CI OVC CB ASSOC VSBY E 3 FEW STRA DRFTG BLO SMT PK 2129/03/
RB20 TSB25 PCPN VRY LGT/ 8/293 56007 ASOS 60008 MANUAL 6009/  
 
1 P.M. 
Weather: Scattered stratus, scattered stratocumulus, scattered altocumulus,
scattered dense cirrus, cumulonimbus associated, few altocumulus N-NE,
few altocumulus castellanus distant SW, cumulonimbi and dark ESE-SSE, line 
of clearing west through north
Temperature: 75F; Dew Point: 72F; Wind: W at 8 kts,
Sea-level pressure: 29.77 ins. Hg, rising then falling slightly
Visibility: 50 miles, except 20 miles NE, hazy, 15 miles SE-SSW,
In rain, 70 miles NW, light distant haze,
6-hour precip: 0.11 inch
6-hour max. temp: 76F
6-hour min. temp. 72F  
BHO SA 1755 7 SCT 60 SCT 85 SCT 200 SCT 200 SCT 250 BKN 50 081/75/72/2608/977/
CBS/DRK DSNT ESE-SSW LINE CLRG W-N FEW ACSL N-NE ACC DSNT SW AC CHAOTIC SKY
DNS CI CB ASSOC E-SW VSBY NE 20 ESE-SSW 15 NW 70 DSNT HZ/ 8/693 50005 MANUAL 
6011/ ASOS 60010 10076 20072
 
WEATHER SUMMARY FOR TUESDAY, SEPTEMBER 4
 
TEMPERATURE (DEGREES F)
MAX.....72    NORMAL.....76
MIN.....62    NORMAL.....59
MEAN....67    NORMAL.....67
 
DEPARTURE FROM 30-YEAR NORMAL......................0
TOTAL DEPARTURE FOR THE MONTH.....................+2 [+0.3 deg/day]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............25 S   AT 11:44 P.M.
                   AERO..................23 S   AT 11:44 P.M. *
                   ASOS..................25 S   AT 11:44 P.M.
                   DAVIS.................N/A                  RMY N/A
THE FASTEST MILE FOR YESTERDAY...........13 SSE AT 10:52 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE............17 S   AT 11:47 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........N/A
AVERAGE WIND SPEED AND DIRECTION.......11.2 S
                   ASOS................10.6
                   DAVIS...............10.1 SSE [105 deg]
* last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.51   DEPARTURE...........+0.39
                         ASOS..............0.51
TOTAL PRECIPITATION FOR THE MONTH..........0.60   DEPARTURE...........+0.14
                         ASOS..............0.59
TOTAL PRECIPITATION FOR THE YEAR..........25.95   DEPARTURE...........-9.53
                         ASOS.............25.85
 
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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
 
9/1  75/60/68/0/0.00/.../..          27 ENE AERO 25 MPH ENE RMY 23
9/2  80/60/70/+2/0.00/.../..         21 ENE AERO 20 MPH ENE RMY 20
9/3  76/57/67/0/0.00/.../..          20 SE  AERO 20 MPH S   RMY 21
9/4  72/62/67/0/..../000/00          25 S   AERO 23 MPH S   RMY N/A
 
9/5 morning low temp: 72F; the normal low is now 58F
 
DAILY RECORDS FOR SEPTEMBER 2012
None so far.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 5
HIGH 90F IN 1971
LOW 45F IN 1906
PRECIP 1.37 INCHES IN 1907
PEAK GUST 46 MPH NW IN 1994
 
RECORDS FOR SEPTEMBER 6
HIGH 92F IN 1900
LOW 39F IN 1888
PRECIP 3.19 INCHES IN 1890
PEAK GUST 78e MPH SE IN 1979 (TROPICAL STORM DAVID)
 
TODAY'S REPORT PREPARED BY: Robert Skilling/Peter Volpe