BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, SEPTEMBER 14, 2011
ALL TIMES ARE IN EASTERN STANDARD TIME
 
VERY WARM AND HUMID WEATHER FOR MID-SEPTEMBER
CONTINUING FOR A THIRD CONSECUTIVE DAY AND FOR
A SIXTH DAY THIS MONTH--DEW POINTS AROUND 65-68F
EARLY MORNING FOG GIVES WAY TO HAZY CONDITIONS
MUCH, MUCH COOLER WEATHER EXPECTED LATE WEEK  
 
The feel of summer for a third day at mid-month
and for a sixth day this month likely to be
replaced by much cooler and drier air late this
week. A cold front is expected to cross the region
tomorrow ushering in a fall-like air mass. In the
meantime, Tropical Storm Maria will be passing just
to the west of Bermuda with its sights possibly set
on Newfoundland.
Earlier this week--
the remnants of Hurricane Katia, which had moved
all the way eastward across the Atlantic, after
passing between the East Coast and Bermuda last week,
brought gale to storm force winds to the British Isles
on Monday with sustained winds of 62 MPH winds gusting
to over 80 MPH in the Scottish Highlands.
 
For reference, below are the current record low temperatures
for later this week when we'll likely be experiencing the coolest
morning temperatures.
 
CURRENT BLUE HILL RECORD LOW TEMPERATURES:
Sept. 16  39F in 1984
Sept. 17  38F in 1959
 
 
Today's observations:
 
7 A.M.  
Weather: Sky partially obscured by fog,
fog obscuring 2/10 of the sky 
Temperature: 68F, Dew point: 66F; Wind: SSW at 10 kts
Sea-level pressure: 29.93 inches Hg, rising  
Visibility: 6 miles in thin fog, SW 8 miles, visibility
increasing past hour
6-hour min. temp: 65F
BHO SA 1155 –X 6F 135/68/66/2010/993/ F2 VSBY SW 8 VSBY
INCR PST HR/ 53014 10068 20065  
 
10 A.M.
Weather: Clear, few cumulus fractus forming NW-NNW
Temperature: 78F, Dew Point: 66F; Wind: SW at 8 kts,
Wind: Direction variable S-WSW
Sea-level pressure: 29.94 inches Hg, rising slightly
Visibility: 12 miles, hazy  
BHO SA 1455 CLR 12 139/78/66/2308/994/ FEW CUFRA FRMG NW-NNW
WND 18V26/ 8/100 53004
 
1 P.M.
Weather: Broken cumulus, moderate cumulus/dark bases  
Temperature: 80F, Dew Point: 67F; Wind: S at 10 kts,
Wind: Direction variable SSE-SW
Sea-level pressure: 29.92 inches Hg, steady
Visibility: 15 miles, WNW 20 miles, hazy 
6-hour max: 83F  
BHO SA 1755 E// BKN 15 132/80/67/1910/992/ MDT CU VSBY
WNW 20 WND 16V22 HAZY/ 8/200 5//// 10083 200//

 
WEATHER SUMMARY FOR TUESDAY, SEPTEMBER 13
 
TEMPERATURE (DEGREES F)
MAX.....81    NORMAL.....72
MIN.....63    NORMAL.....54
MEAN....72    NORMAL.....63
 
DEPARTURE FROM 30-YEAR NORMAL.....................+9
TOTAL DEPARTURE FOR THE MONTH....................+20 [+1.3 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............27 S    AT  4:02 P.M. * 
                   AEROVANE...............32 S    AT  4:02 P.M. 
                   ASOS...................26 S    AT  6:20 P.M.
                   DAVIS..................N/A                  RMY 26
THE FASTEST MILE FOR YESTERDAY............ 21 S   AT  4:38 P.M. *  
MAXIMUM 2-MINUTE ASOS AVERAGE............. 21 S   AT  4:58 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE............N/A    
AVERAGE WIND SPEED AND DIRECTION........12.8 S  
                   ASOS.................12.8
                   DAVIS.................N/A
*...last of several occurrences
N/A - power outage
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE.........-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........3.23  DEPARTURE.........+1.48
                         ASOS..............3.18
TOTAL PRECIPITATION FOR THE YEAR..........41.27  DEPARTURE.........+6.05
                        ASOS..............41.74**
**ASOS data is in error due to system failure on 1/12-13
 
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2011 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:  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  76/58/67/0/0.00/441/56     17 NE  AERO 22 MPH RMY 17 MPH
9/2  71/57/64/-2/0.00/708/90    15 NE  AERO 20 MPH RMY N/A
9/3  83/57/70/+4/0.00/619/79    21 SSW AERO 27 MPH RMY 22 MPH
9/4  81/65/73/+7/0.00/266/34    34 S   AERO 35 MPH RMY 31 MPH
9/5  83/65/74/+9/0.00/467/60    37 S   AERO 44 MPH RMY 40 MPH
9/6  70/56/63/-2/1.10/000/00    36 NNW AERO 45 MPH NNW RMY 40 MPH
9/7  60/56/58/-7/0.62/000/00    29 NE  AERO 32 MPH NE  RMY 28 MPH
9/8  60/56/58/-7/1.51/000/00    29 ENE AERO 31 MPH ENE RMY 27 MPH
9/9  76/58/67/+3/0.00/506/66    18 NNW AERO 26 MPH NNW RMY 21 MPH
9/10 72/56/64/0/0.00/718/94     18 NNE AERO 25 MPH N   RMY 22 MPH
9/11 74/54/64/0/0.00/632/83     18 S   AERO 25 MPH S   RMY 21 MPH
9/12 80/57/69/+6/0.00/668/88    20 SW  AERO 27 MPH SSW RMY 22 MPH
9/13 81/63/72/+9/0.00/627/83    27 S   AERO 32 MPH S   RMY 26 MPH
 
9/14 our morning low temp: 65F; the normal low is now 54F
 
DAILY RECORDS FOR SEPTEMBER 2011
9/8 - RECORD DAILY PRECIPITATION OF 1.51 inches;
surpasses the previous record of 0.79 inch set in 2004 
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 14
HIGH 90F IN 1931
LOW 34F IN 1911
PRECIP 4.38 INCHES IN 1944 (Great Atlantic Hurricane in 1944)
PEAK GUST 96e MPH E IN 1944 (Great Atlantic Hurricane in 1944)
 
RECORDS FOR SEPTEMBER 15
HIGH 89F IN 1931
LOW 35F IN 1913
PRECIP 3.93 INCHES IN 1904 (Extra-tropical storm making landfall in New England on 9/15/1904 passing east of BHO and bringing a storm total of 4.11 inches 9/14-15/1904)
PEAK GUST 65e MPH NW, WSW IN 1944 (In the wake of Great Atlantic Hurricane)
 
TODAY'S REPORT PREPARED BY: Robert Skilling