BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, SEPTEMBER 26, 2012 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
VERY LITTLE SUNSHINE TODAY THROUGH BREAKS IN
A SKY FILLED WITH STRATOCUMULUS CLOUDS
AS THE AIR MASS HAS BECOME INCREASINGLY MOIST DEW
POINTS HAVE RISEN INTO THE LOWER 60'S. 
ONLY A TRACE OF RAIN IN A COUPLE OF SHOWERS
 
A little sunshine was appearing through some breaks in an
overcast sky this morning.  A south to south-southwest
wind which has been gusty since yesterday and has imported
humid air with dew points rising to the lower 60's after
being in the dry 40's yesterday. A couple of light showers
have been brief and left only a trace of rain.
Yesterday's average temperature was 60F and was the 8th
day this month to have a mean temperature which came right
out on the normal for their respective dates.  September
is now only fractionally warmer than normal at +0.3 degree.
 
Today's observations:
 
7 A.M.
Weather: Broken altocumulus, 2 levels, overcast cirrostratus,
overcast partly thin overhead, light rain shower ended at
6:10 A.M. EST
Temperature: 60F; Dew Point: 58F; Wind: S at 14 kts,
Wind: Direction variable SSE-SSW
Sea-level pressure: 30.12 ins. Hg, falling then more slowly
Visibility: 20 miles, thin fog all quadrants
6-hour min. temp: 57F
BHO SA 1155 E90 BKN 150 BKN 250 OVC 20 199/60/58/1814/012/ OVC PTLY THN
OVHD THN F ALQDS WND 15V21 RE10/ 8/077 56004 MANUAL 6000/ 10060 20057
 
10 A.M. 
Weather: Broken cumulus, overcast stratocumulus, higher cloud
visible, bright spots in overcast, sun occasionally visible 
Temperature: 68F; Dew Point: 60F; Wind: SSW at 14G24 kts,
Wind: Peak wind of 27 kts. from the S at 9:08 AM EST
Sea-level pressure: 30.10 ins. Hg, falling then more rapidly  
Visibility: 30 miles, except NE 35 miles, hazy all quadrants
BHO SA 1455 E27 BKN 33 OVC 30 192/68/60/2114G24/010/ BRGHT SPTS IOVC
HIER CLD VSB SUN OCNL VSBY NE 35 HAZY ALQDS VSB PK WND 1827/08/
8/8// 58007
 
1 P.M. 
Weather: Broken stratocumulus, overcast stratocumulus, few lower
cumulus fractus/cumulus, occasional small break in overcast,
bright spots in overcast, light rain shower began 12:00 PM ended
12:10 P.M. EST   
Temperature: 70F; Dew Point: 62F; Wind: SSW at 15 kts,
Wind: Gust to 23 kts past hour
Sea-level pressure: 30.06 ins. Hg, falling, then more slowly
Visibility: 25 miles, hazy, haze increasing   
6-hour max. temp: 70F
6-hour precip: trace 
BHO SA 1755 E27 BKN 32 OVC 25 178/70/62/2015/006/ OCNL SML BINOVC
BRGHT SPTS IOVC FEW LWR CUFRA/CU  HAZY HZ INCRSNG GST 23 KTS PST HR
RB00E10/ 8/8// 56014 6000/ 10070 20060 
 
WEATHER SUMMARY FOR TUESDAY, SEPTEMBER 25
 
TEMPERATURE (DEGREES F)
MAX.....72    NORMAL.....69
MIN.....48    NORMAL.....52
MEAN....60    NORMAL.....60
 
DEPARTURE FROM 30-YEAR NORMAL......................0
TOTAL DEPARTURE FOR THE MONTH....................+12 [+0.3 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............5    DEPARTURE........-1
TOTAL HEATING UNITS FOR THE MONTH............63    DEPARTURE.......-17
TOTAL HEATING UNITS FOR THE SEASON...........63    DEPARTURE.......-42
TOTAL HEATING UNITS LAST SEASON TO DATE......75    DIFFERENCE......-12
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............35 SSW AT  4:26 P.M. *
                   AERO..................35 SW  AT  1:27 P.M. *
                   ASOS..................35 SSW AT  4:26 P.M.
                   DAVIS.................34 SSW AT  2:52 P.M. RMY 36
THE FASTEST MILE FOR YESTERDAY...........28 SSW AT  4:47 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............26 SSW AT  4:27 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........27 SSW AT  4:28 P.M.
AVERAGE WIND SPEED AND DIRECTION.......17.2 SW
                   ASOS................16.8
                   DAVIS...............15.2 SW [220 deg]
* Last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....trace  DEPARTURE...........-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........2.28   DEPARTURE...........-1.04
                         ASOS..............2.30
TOTAL PRECIPITATION FOR THE YEAR..........27.63   DEPARTURE..........-10.71
                         ASOS.............27.56
 
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  75/60/68/0/0.00/637/81          27 ENE AERO 25 MPH ENE RMY 23
9/2  80/60/70/+2/0.00/455/58         21 ENE AERO 20 MPH ENE RMY 20
9/3  76/57/67/0/0.00/485/62          20 SE  AERO 20 MPH S   RMY 21
9/4  72/62/67/0/0.40/000/00          25 S   AERO 23 MPH S   RMY N/A
9/5  79/64/72/+5/0.31/171/22         33 SSW AERO 35 MPH SSW RMY 33
9/6  77/62/70/+3/0.00/279/36         20 SSW AERO 20 MPH SSW RMY 19
9/7  85/66/76/+10/0.00/463/60        22 SSW AERO 20 MPH SSW RMY N/A TSTM
9/8  81/62/72/+6/0.38/453/59         45 S   AERO 45 MPH S   RMY 45   
9/9  72/58/65/-1/0.02/283/37         25 WNW AERO 23 MPH WNW RMY N/A
9/10 66/50/58/-7/0.00/313/41         33 NW  AERO 32 MPH NW  RMY 34
9/11 71/47/59/-6/0.00/714/94         23 NW  AERO 21 MPH WNW RMY N/A
9/12 77/53/65/0/0.00/719/95          20 S   AERO 18 MPH S   RMY 18
9/13 81/59/70/+6/0.00/731/97         21 S   AERO 18 MPH S   RMY 19
9/14 81/59/70/+6/0.00/706/94         25 S   AERO 23 MPH S   RMY 23
9/15 72/54/63/-1/0.07/441/59         28 NW  AERO 27 MPH WNW RMY 27
9/16 70/49/60/-3/0.00/731/98         23 W   AERO 20 MPH W   RMY 21
9/17 74/51/63/0/0.00/698/94          20 S   AERO 17 MPH S   RMY N/A
9/18 74/58/66/+4/0.13/044/06         60 S   AERO 62 MPH S   RMY 63
9/19 70/53/62/0/0.90/472/64          55 S   AERO 56 MPH S   RMY N/A
9/20 63/50/57/-5/0.00/539/87         24 NE  AERO 21 MPH NE  RMY 21
9/21 63/48/56/-5/0.01/241/33         18 E   AERO 16 MPH E   RMY 16
9/22 70/55/63/+2/0.04/306/42         28 S   AERO 25 MPH S   RMY 27
9/23 69/50/60/0/0.02/.../..          27 WNW AERO 24 MPH WNW RMY 27
9/24 66/45/56/-4/0.00/.../..         23 WSW AERO 21 MPH WSW RMY 22
9/25 72/48/60/0/0.00/.../..          35 SSW AERP 35 MPH SW  RMY 36
 
9/26 morning low temp: 57F; the normal low is now 51F
 
DAILY RECORDS FOR SEPTEMBER 2012
9/19 - NEW RECORD PEAK WIND GUST OF 55 MPH S;
       surpasses previous record of 49 MPH NE IN 1972
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 26
HIGH 91F IN 2007
LOW 36F IN 1905,1922,1978
PRECIP 3.84 INCHES IN 1888
PEAK GUST 54e MPH S IN 1977
 
RECORDS FOR SEPTEMBER 27
HIGH 84F IN 1998
LOW 32F IN 1947
PRECIP 2.26 INCHES IN 1962
PEAK GUST 100 MPH SSE IN 1985 (HURRICANE GLORIA)
 
TODAY'S REPORT PREPARED BY: Robert Skilling