BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JULY 19, 2008     
ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED  

HOT AND HUMID WEATHER CONTINUES...THUNDERSTORMS
POSSIBLE LATER TODAY...
The temperature has reached 91 for the second consecutive
day as of early afternoon. The dew point, which had started
the day in the upper 60s with light winds, has dropped to
the low 60s by afternoon as the wind has picked up. 
Thunderstorms in the area on Friday evening brought only 
0.03 inch to Blue Hill, and a severe thunderstorm watch
has been posted by the NWS for this afternoon and evening.   

Today's observations:

8 A.M. EDT
Weather: Scattered altocumulus, scattered cirrocumlus and
thin broken cirrus
Temperature: 71F, Dew point: 68F,  Wind: SW at 8 kts 
Sea-level pressure: 29.97 inches Hg, rising
Visibility: 7 miles, hazy
6-hourly minimum temperature: 66F     
24-hourly rainfall: 0.03 in.
BHO SA 1155 150 SCT 220 SCT 250 –BKN 7 150/71/68/2308/997/ 
HAZY WND LGT/ 8/031 51003 70003 10071 20066

11 A.M. EDT
Weather: Scattered cirrostratus, thin overcast cirrus, 
Temperature: 84F, Dew point: 68F,  Wind: W at 8 kts, 
Sea-level pressure: 29.98 inches Hg, rising
Visibility: 10 miles, hazy   
BHO SA 1455 220 SCT 250 –OVC 10 153/84/68/2608/998/ HAZY 
WND LGT/ 8/001 51003

2 P.M. EDT
Weather: Scattered cumulus, scattered cirrus
Temperature: 90F, Dew point: 62F,  Wind: SW at 14G21 kts, 
Sea-level pressure: 29.96 inches Hg, falling
Visibility: 12 miles, hazy
6-hourly max. temp. 91F  
BHO SA 1755 55 SCT 250 SCT 12 146/90/62/2414G21/996/ 
FEW CUFRA HAZY/ 8/101 56007 10091 20071

WEATHER SUMMARY FOR FRIDAY, JULY 18

TEMPERATURE (DEGREES F)
MAX.....91    NORMAL.....82
MIN.....66    NORMAL.....62
MEAN....79    NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL.............+7 
TOTAL DEPARTURE FOR THE MONTH............+56 [+2.9 DEGREES/DAY]

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............23 SE  AT 11:42 P.M.*  
                   AEROVANE.............22 SE  AT 11:32 P.M.  
                   ASOS.................22 NNE AT  8:16 P.M. 
                   DAVIS................N/A  
FASTEST MILE FOR YESTERDAY..............17 SE  AT 11:33 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...........16 SE  AT 11:34 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..........N/A  
                   AVERAGE............ 9.5 SW 
                   ASOS................9.3 
                   DAVIS...............8.7 SW [214 deg]  
* Last of several occurrences. 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.03   DEPARTURE......-0.09  
                         ASOS..............0.03
TOTAL PRECIPITATION FOR THE MONTH..........1.79   DEPARTURE......-0.39  
                         ASOS..............1.82   
TOTAL PRECIPITATION FOR THE YEAR..........26.79   DEPARTURE......-1.06    
                         ASOS.............29.20 #
# Includes erroneous ASOS precipitation data on 2/13/08.

PRELIMINARY CLIMATE SUMMARY FOR JULY 2008 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane recording wind system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized

7/1  83/66/75/+5/0.15/411/45     28 SSW   TSTM
7/2  84/61/73/+3/1.02/593/65     44 W     TSTM Small hail
7/3  85/63/74/+4/T/793/87        45 SW    Aero 44 MPH SW
7/4  69/59/64/-6/0.22/018/02     25 NE
7/5  70/62/66/-5/0.01/000/00     17 E
7/6  81/65/73/+2/0/245/27        20 S
7/7  86/67/77/+6/0/563/62        21 S
7/8  89/69/79/+8/0/753/83        30 SSE  
7/9  88/70/79/+8/T/734/81        36 SSW  TSTM Aero 35 MPH SSW
7/10 82/65/74/+3/T/887/98        28 W    Aero 29 MPH W
7/11 83/61/72/0/0/759/84         17 NW   
7/12 82/65/74/+2/0/631/70        28 S  
7/13 81/66/74/+2/0/784/87        38 S    Aero 40 MPH S  
7/14 80/67/74/+2/0.36/468/52     23 W    TSTM 
7/15 87/67/77/+5/0/799/89        22 SSW
7/16 88/66/77/+5/0/.../..        22 SSE
7/17 86/68/77/+5/0/.../..        20 SW   
7/18 91/66/79/+7/0.03/.../..     23 SE   TSTM

7/19 morning low temp. 66F; our normal low now 62F

NEW DAILY RECORDS FOR JULY 
None to date...       
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR JULY 19
HIGH 96F IN 1977, 1991
LOW 50F IN 1890
PRE 1.10 INS IN 1951
WIND 63 MPH SSW IN 1982

RECORDS FOR JULY 20
HIGH 99F IN 1991
LOW 47F IN 1890
PRE 1.64 INS IN 1938
WIND 56e MPH SSW IN 1943

TODAY'S REPORT PREPARED By: Mike Iacono