BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, SEPTEMBER 15, 2007    
ALL TIMES ARE IN EASTERN STANDARD TIME

COLD FRONTAL PASSAGE JUST BEFORE NOON EDT TODAY...
Rain began shortly after 2:30 AM this morning and accumulated
to 0.24 inch through 8 AM EDT.  An additional 0.09 inch was
measured for the 6 hours ending at 2 PM EDT.  A cold front
passed at 11:50 AM EDT bringing a brief moderate rain shower
and a pair of sudden wind gusts to 35 mph WNW at 11:50 AM
and 11:52 AM EDT.  The temperature dropped down to 55 degrees
after the frontal passage, and the dew point has dropped into
the upper 40s.  

Today's observations:

7 A.M.   
Weather: Light rain, scattered stratus, broken stratocumulus and 
overcast nimbostratus; some stratus and patches of dense ground fog 
below summit
Temperature: 61F, Dew point: 60F, Wind: E at 6 kts 
Sea-level pressure: 29.83 inches Hg, falling
Visibility: 8 miles    
6-hour min temp: 60F
24-hour rainfall: 0.24 in. 
BHO SA 1155 3 SCT E20 BKN 35 BKN 50 OVC 8R- 101/61/60/0906/983/ 
STRA BLO SMT W-NE PTCHS DNS GF ALQDS VSBY N 2 SE 20 VSBY OCNL LWR 
WND LGT/ 8/62/ 56020 6024/ 70024 10061 20060

10 A.M.   
Weather: Sky obscured in light rain and dense fog 
Temperature: 61F, Dew point: 60F, Wind: W at 7 kts 
Sea-level pressure: 29.82 inches Hg, falling
Visibility: 1/16 miles
3-hour rainfall: 0.04 inch  
BHO SA 1455 W1 X 1/16R-F 098/61/60/2607/982/ RB35 WND LGT/ 8//// 
55003 6004/ 

1 P.M.   
Weather: Scattered stratus, overcast stratocumulus, breaks in overcast
distant W-NW, rain shower N moving NE
Temperature: 56F, Dew point: 54F, Wind: W at 10 kts
Sea-level pressure: 29.85 inches Hg, rising
Visibility: 50 miles
6-hour max. temp: 61F
6-hour min. temp: 55F 
BHO SA 1755 5 SCT E30 BKN 50 OVC 50 111/56/54/2810/985/ HAZY FEW CUFRA 
ALQDS BINOVC DSNT W-NW RW N MVNG NE WND 25V31/ 8/5// 51013 6009/ 10061 
20055 


WEATHER SUMMARY FOR FRIDAY, SEPTEMBER 14
 
TEMPERATURE (DEGREES F)
MAX.....76    NORMAL.....72 
MIN.....56    NORMAL.....54
MEAN....66    NORMAL.....63
DEPARTURE FROM 30-YEAR NORMAL.........+3 
TOTAL DEPARTURE FOR THE MONTH........+37  [+2.4 DEGREES/DAY] 

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............26 SSE AT 1:55 P.M.
                   AEROVANE...............24 SSE AT 1:55 P.M.
                   ASOS...................N/A  #
                   DAVIS..................29 SSE AT 5:24 P.M.
FASTEST MILE FOR YESTERDAY................20 S   AT 4:14 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE............20 S   AT 3:11 P.M.
AVERAGE WIND SPEED AND DIRECTION..........12.4 SSE 
                   ASOS...................N/A  #
                   DAVIS..................11.4 SSE [156 deg]

# ASOS WINDS SWITCHED OFF BY NWS 6/6, IT IS NOT KNOWN WHEN 
  THAT DATA WILL RESUME
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.24  DEPARTURE.....+0.10
                         ASOS..............0.24 
TOTAL PRECIPITATION FOR THE MONTH..........1.77  DEPARTURE.....-0.12  
                         ASOS..............1.80    
TOTAL PRECIPITATION FOR THE YEAR..........32.76  DEPARTURE.....-2.60
                         ASOS.............32.03     

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2007...CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
 
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available

9/1  79/57/68/+1/0/790/100    25 WNW   
9/2  78/51/65/-1/0/787/100    22 S   
9/3  85/57/71/+5/0/760/97     31 SSW AERO 28 MPH SSW 
9/4  76/61/69/+3/0/641/82     28 NW  AERO 26 MPH NW
9/5  74/53/64/-1/0/732/94     21 ESE 
9/6  76/55/66/+1/0/380/49     31 S
9/7  92/62/77/+12/0/680/88    30 SSW
9/8  93/67/80/+15/0/686/89    31 S    TSTM 
9/9  72/57/65/+1/0.16/000/00  28 NNE  TSTM 
9/10 66/57/62/-2/0.03/000/00  18 NNE
9/11 68/58/63/-1/1.34/000/00  30 WNW  
9/12 73/55/64/+1/0/752/99     35 W   Aero 33 MPH W
9/13 73/52/63/0/0/741/98      23 ESE Aero 18 MPH ESE
9/14 76/56/66/+3/0/587/78     26 SSE

9/15 morning low temp. of 60F; normal low now 54F
 

NEW DAILY RECORDS FOR SEPTEMBER 2007:  

9/7 - RECORD HIGH TEMPERATURE 92; PREVIOUS 91 IN 1945.
9/8 - RECORD HIGH TEMPERATURE 93; PREVIOUS 91 IN 1945.

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
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)

RECORDS FOR SEPTEMBER 16
HIGH 91F IN 1939,1941
LOW 39F IN 1984
PRECIP 5.12 INCHES IN 1933 (Hurricane)
PEAK GUST 59 MPH SSE IN 1999

TODAY'S REPORT PREPARED By: Mike Iacono

If you do not wish to receive this Daily Discussion and 
Climate Summary from the Blue Hill Observatory, please 
send an email to sitemaster@bluehill.org.