BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, SEPTEMBER 25, 2007    
ALL TIMES ARE IN EASTERN STANDARD TIME
 
NEAR RECORD OR RECORD HEAT TODAY AND TOMORROW
TEMPERATURES UP TO 86F BY 2 PM TODAY
 
Record or near record late September heat is expected both 
today and tomorrow.  Our record high temperature  
for 25 September is 87 degrees in 1970 and for 26 September 
it is also 87 degrees recorded in 1958.  Boston's record 
for 26 September is 95 degrees in 1881 so that is  before 
the Blue Hill record began. Our temperature was only one 
degree from the record as of 2 p.m.
 
Today's observations:
 
7 A.M.   
Weather: Clear, few cirrus distant NNW-NE, smoke layer along horizon
to the S-SW and NNE-NE   
Temperature: 60F, Dew point: 49F, Wind: WSW at 12 kts 
Sea-level pressure: 30.12 inches Hg, falling
Visibility: 60 miles  
6-hour min temp: 58F
24-hour rainfall: 0.00 inches
BHO SA 1155 CLR 60 199/60/49/2412/012/ FEW CI DSNT NNW-NE 
K LYR ALG HRZN S-SW AND NNE-NE/ 8/001 50009 10060 20057 
 
10 A.M.   
Weather: Clear, few cirrus northwest through northeast 
Temperature: 76F, Dew point: 52F, Wind: SW at 8 kts
Wind: Variability S-WSW
Sea-level pressure: 30.08 inches Hg, falling
Visibility: 45 miles, increasing light haze 
BHO SA 1455 CLR 45 187/76/52/2208/008/ CI/DENSE CI DSNT NW-NE 
THN K ALG HRZN SW-NW-NE LGT HZ INCRSNG WND 19V25/ 8/002 58012 
 
1 P.M.   
Weather: Clear, cirrus distant NW-ENE 
Temperature: 85F, Dew point: 53F, Wind: SSW at 16G22 kts
Wind: Variability S-WSW
Sea-level pressure: 30.03 inches Hg, falling
Visibility: 35 miles, light haze   
6-hour max. temp. 86F
BHO SA 1755 CLR 35 168/85/53/2016G22/003/ CI/DENSE CI DSNT NW-ENE 
LGT HZ ALQDS WND 18V24/ 8/002 58019 10086 20060
 
WEATHER SUMMARY FOR MONDAY, SEPTEMBER 24
 
TEMPERATURE (DEGREES F)
MAX.....80    NORMAL.....68 
MIN.....55    NORMAL.....50
MEAN....68    NORMAL.....59
DEPARTURE FROM 30-YEAR NORMAL........+ 9 
TOTAL DEPARTURE FOR THE MONTH........+51  [+1.9 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............24 WNW AT 1:04 A.M.   
                   AEROVANE...............21 WNW AT 1:04 A.M.     
                   ASOS...................24 WNW AT 1:04 A.M.  
                   DAVIS..................25 SSW AT 7:25 P.M. 
FASTEST MILE FOR YESTERDAY................19 WNW AT 1:06 A.M.        
MAXIMUM 2-MINUTE ASOS AVERAGE.............18 WNW AT 1:07 A.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE............20 WNW AT 1:05 A.M.     
AVERAGE WIND SPEED AND DIRECTION..........11.9 NW 
                   ASOS...................11.7  
                   DAVIS..................12.3 W [270 deg]

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..........1.86  DEPARTURE.....-1.43  
                         ASOS..............1.88    
TOTAL PRECIPITATION FOR THE YEAR..........32.85  DEPARTURE.....-3.91
                         ASOS.............32.11    
 
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  
9/14 76/56/66/+3/0/587/78     26 SSE
9/15 63/49/56/-6/0.33/225/30  36 WNW  
9/16 65/45/55/-7/0/606/81     20 WNW  
9/17 63/46/55/-7/0/738/99     20 NE  
9/18 64/46/55/-6/0/720/97     22 NE    
9/19 69/48/59/-2/0/414/56     18 S 
9/20 81/53/67/+6/0/597/81     18 SSW
9/21 77/60/69/+9/0/653/89     20 N
9/22 79/60/70/+10/0/417/57    27 S
9/23 77/59/68/+8/0/713/98     25 WNW
9/24 80/55/68/+9/0/703/97     24 WNW
 
9/25 morning low temp. 57F; normal low is now 50F 
 
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 25
HIGH 87F IN 1970
LOW 31F IN 1950
PRECIP 2.68 INCHES IN 1961
PEAK GUST 63 MPH SSW IN 1991
 
RECORDS FOR SEPTEMBER 26
HIGH 87F IN 1958
LOW 36F IN 1905,1922,1978
PRECIP 3.84 INCHES IN 1888
PEAK GUST 54e MPH S IN 1977
 
TODAY'S REPORT PREPARED By: Robert Skilling