BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, AUGUST 20, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
VERY COOL AND DRY CONDITIONS FOR LATE AUGUST 
RECORD HIGH PEAK WIND GUST FOR AUGUST 18TH
 
Considerable high cloudiness is dimming the sunshine
early this afternoon,  This combined with a northeast 
wind off the cool Atlantic Ocean, will cause today's 
temperatures to average out at least a half dozen degrees 
cooler than normal.  Today will be the third consecutive 
day with temperatures averaging well below normal.  The 
above normal temperatures for the month are quickly 
falling to near normal now.
 
Rainfall continues to be very light for the month 
with only a little more than a half inch.  The 
showers and thunderstorms late Friday and very 
early Saturday morning left on 0.15 inch.  The 
month of August is now close to being 2 inches drier
than average to date.
 
A new record high wind gust for August 18th of 46 MPH 
from the WNW occurred on Saturday at 10:46 a.m. EDT. 
The previous record was 39 MPH from the SW in 1991. 
 
Today's observations:
 
7 A.M.   
Weather: Scattered thin altocumulus, cirrus
Temperature: 60F, Dew point: 50F, Wind: NE at 8 kts 
Wind: Veering gradually past hour 
Sea-level pressure: 30.20 inches Hg, steady
Visibility: 50 miles, NW 70 miles 
6-hour min temp: 56F
BHO SA 1155 180 –SCT 220 –SCT 250 –SCT 300 –BKN 50 226/60/50/0408/020/ 
OCNL SML CU FRMG N-NNE VSBY NW 70 LGT DSNT HZ THN K ALG HRZN SW-NW 
WND GRDLY VEERING WND 36V07/ 8/131 50005 10060 20056  
 
10 A.M.   
Weather: Scattered cumulus forming, thin broken cirrus 
Temperature: 68F, Dew point: 53F, Wind: NE at 10 kts
Wind: Variability NNW-ENE
Sea-level pressure: 30.22 inches Hg, rising
Visibility: 60 miles, NW 70   
BHO SA 1455 45 SCT 130 SCT 220 SCT 250 –BKN 300 –BKN 60 236/68/53/0410/
022/ CU/FEW MDT CU FRMG E-S-WSW FEW ACSL DSNT W PTCHS DENSE CI/CC/VIRGA  
SNW TRLS FEW CCSL VSBY NW 70 WND 34V07/ 8/242 53010
 
1 P.M.  
Weather: Scattered cumulus, stratocumuls SE-SW-N dense high overcast 
of cirrus with few thin spots 
Temperature: 69F, Dew point: 52F, Wind: NE at 10 kts
Wind: Variability N-E 
Sea-level pressure: 30.20 inches Hg, falling
Visibility: 55 miles    
6-hour max. temp. 70 F 
BHO SA 1755 50 SCT E220 OVC 55 228/69/52/0410/020/ CU/SC FEW MDT TOPS 
SE-SW-N DNS CI ALQDS FEW THN SPTS IOVC OVHD AND DSNT NE-E WND 35V09/ 
8/402 58008 10070 20060 
 
WEATHER SUMMARY FOR SUNDAY, AUGUST 19
 
TEMPERATURE (DEGREES F)
MAX.....74    NORMAL.....79 
MIN.....51    NORMAL.....61
MEAN....63    NORMAL.....70
DEPARTURE FROM 30-YEAR NORMAL.........-7
TOTAL DEPARTURE FOR THE MONTH........+16  (+0.6 DEGREES/DAY)
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............25 WNW AT  1:43 P.M. 
                   AEROVANE...............23 WNW AT  1:43 P.M. 
                   ASOS...................N/A  #
                   DAVIS..................24  W   AT 12:08 P.M. 
FASTEST MILE FOR YESTERDAY................16  WNW AT  1:48 P.M. **
MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE............18  W   AT 12:04 P.M.
AVERAGE WIND SPEED AND DIRECTION..........7.4 WNW  
                   ASOS...................N/A  #
                   DAVIS..................N/A 
 
# ASOS WINDS SWITCHED OFF BY NWS 6/6, IT IS NOT KNOWN WHEN 
  THAT DATA WILL RESUME
** last of several occurrences.... 
** the corrected fastest mile for 8/18 is 34 MPH WNW @ 9:54 A.M. 
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE.....-0.13
                         ASOS..............0.00 
TOTAL PRECIPITATION FOR THE MONTH..........0.62  DEPARTURE.....-1.82  
                         ASOS..............0.55    
TOTAL PRECIPITATION FOR THE YEAR..........30.98  DEPARTURE.....-0.87 
                         ASOS.............30.22    
 
PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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
 
8/1  84/67/76/+4/0/851/98     20 NNE    
8/2  92/68/80/+8/0/823/95     21 S     
8/3  92/70/81/+9/0/760/88     28 SSW
8/4  89/71/80/+8/0/827/96     29 WSW  
8/5  80/62/71/-1/0/842/98     23 SSE 
8/6  77/61/69/-3/0.05/129/15  36 SSE  Aero 34 MPH SSE TSTM  
8/7  82/67/75/+4/0.12/410/48  15 SSE 
8/8  88/70/79/+8/0.10/349/41  36 S
8/9  75/60/68/-3/0/722/85     32 NW
8/10 63/53/58/-13/0.19/017/02 16 SSW
8/11 83/52/68/-3/0/743/88     21 WNW
8/12 86/64/75/+4/0/665/79     21 SSW
8/13 83/64/74/+3/0.01/260/31  30 NW   TSTM 
8/14 78/58/68/-2/0/812/97     23 NW
8/15 83/59/71/+1/0/651/78     36 SSW  Aero 34 MPH SSW
8/16 87/67/77/+7/0/641/77     33 SSW
8/17 78/62/70/0/0.07/.../..   43 S    Aero 39 MPH S TSTM  
8/18 71/52/62/-8/0.08/.../..  46 WNW  Aero 42 MPH WNW, Davis 46 MPH WNW TSTM  
8/19 74/51/63/-7/0/.../..     25 WNW 
 
8/20 morning low temp. 56 deg; our normal low now 60 deg.
 
NEW DAILY RECORDS FOR AUGUST 2007: 
 
8/18 - NEW RECORD PEAK GUST FOR OF 46 MPH WNW; 
the previous record was 39 MPH SW in 1991.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR AUGUST 20
HIGH 93F IN 1937
LOW 48F IN 1896, 1905, 1949
PRECIP 2.71 INCHES IN 1970
PEAK GUST 47 MPH W 1983
 
RECORDS FOR AUGUST 21
HIGH 92F IN 1937, 1995
LOW 47F IN 1982
PRECIP 2.84 INCHES IN 1888
PEAK GUST 54 MPH WSW 2004
 
TODAY'S REPORT PREPARED By: Robert Skilling