BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JULY 19, 2012 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
THUNDERSTORMS WEDNESDAY WERE SEVERE IN SOME
PARTS OF EASTERN MASSACHUSETTS BUT MORE BIG 
RAIN PRODUCERS HERE AT BLUE HILL
 
The total rainfall was 1.44 inches in two separate
thunderstorms during the mid to late afternoon. 
A half inch of rain fell in just 20 minutes ending
about 3:40 P.M. EDT and almost an inch fell in the
hour ending at just before 6 P.M. 
 
The peak wind gust of 40 MPH NE came from an intense
thunderstorm passing well to our north and northeast
well before the rain began from more storms coming
from our west. 
 
Today's observations:
 
7 A.M.
Weather: Overcast altostratus, bright spots in overcast distant
N-ENE, virga and dark distant E-SW    
Temperature: 65F; Dew Point: 59F 
Wind: ENE at 6 kts   
Sea-level pressure: 30.00 ins. Hg rising then rising more rapidly    
Visibility: 40 miles except 50 miles WNW, 30 miles E-SW, distant haze,
and precipitation (virga) E-SW 
6-hour precip: trace
24-hour precip: 1.44
6-hour min. temp: 63F
BHO SA 1155 E60 OVC 40 159/65/59/0706/000/ CIG/VSBY LWR E-SW BRGT SKY
DSNT N-ENE DRK DSNT E-SW PTCHS VIRGA DSNT E-SW VSBY WNW 50 E-SW 30
DSNT HZ/PCPN 8/02/ 53017 MANUAL 6000/ MANUAL 70144 ASOS 70147 10068 20063
 
10 A.M.
Weather: Broken altocumulus, broken cirrus (3 layers), few cirrocumulus
NNW, cirrus layers partly thin
Temperature: 71F; Dew Point: 54F 
Wind: ENE @ 4 kts 
Sea-level pressure: 30.00 ins. Hg rising slightly
Visibility: 35 miles except 45 miles WNW, distant haze 
BHO SA 1455 E110 BKN 220 -BKN 250 -BKN 300 -BKN 35
160/71/54/0704/000/ CUFRA/CU FRMG DSNT W-N AND ESE-SSE
FEW CC VC NNW VSBY WNW 5 DSNT HZ/ 8/171 53001
 
1 P.M.
Weather: Scattered cumulus, few moderate, few stratocumulus
cumulogenitus, thin broken cirrus, few lower cirrus distant
WSW-W, cumulus except distant NE-E
Temperature: 77F; Dew Point: 54F
Wind: Light and variable
Wind: Direction variable 
Sea-level pressure: 29.98 ins., falling then falling more rapidly  
Visibility: 35 miles except 45 miles WNW, distant haze  
6-hour max temp: 77F
BHO SA 1755 55 SCT 250 –BKN 35 151/77/54/2304/998/
CU/FEW MDT CU XCPT DSNT NE-E LWR CI DSNT WSW-W
VSBY WNW 45 DSNT HZ ALQDS WND L/V/ 8/101 58009 10077 20065
 
WEATHER SUMMARY FOR WEDNESDAY, JULY 18
 
TEMPERATURE (DEGREES F)
MAX.....91    NORMAL.....81
MIN.....69    NORMAL.....63
MEAN....80    NORMAL.....72
 
DEPARTURE FROM 30-YEAR NORMAL.......................+8
TOTAL DEPARTURE FOR THE MONTH......................+95 [+5.1 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............40 NE  AT 1:34  P.M.
                   AERO..................39 NE  AT 1:33  P.M.
                   ASOS..................39 NE  AT 1:34  P.M.
                   DAVIS.................39 NE  AT 1:34  P.M. RMY 41
THE FASTEST MILE FOR YESTERDAY...........31 ENE AT 1:33  P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............30 ENE AT 1:35  P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........28 NE  AT 1:35  P.M.
AVERAGE WIND SPEED AND DIRECTION........9.0 WSW
                   ASOS.................8.1
                   DAVIS................8.3 WSW [246 deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 1.44   DEPARTURE...........+1.31
                         ASOS..............1.48
TOTAL PRECIPITATION FOR THE MONTH..........1.83   DEPARTURE...........-0.37
                         ASOS..............1.84
TOTAL PRECIPITATION FOR THE YEAR..........19.52   DEPARTURE..........-9.65
                         ASOS.............19.46
 
PRELIMINARY CLIMATE SUMMARY FOR JULY 2012 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
RMY:  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
 
7/1  89/67/78/+8/0.01/676/74        33 WSW AERO 32 MPH WSW RMY 34 TSTM*
7/2  84/66/75/+5/T/644/71           23 W   AERO 22 MPH W   RMY 23
7/3  85/63/74/+3/0.00/787/86        23 W   AERO 21 MPH W   RMY 20
7/4  85/66/76/+5/0.37/480/53        20 W   AERO 20 MPH W   RMY 23 TSTM*
7/5  81/68/75/+4/0.00/729/80        23 NW  AERO 23 MPH NW  RMY 22
7/6  86/64/75/+4/0.00/753/83        18 SSW AERO 18 MPH SSW RMY 19
7/7  81/69/75/+4/T/224/25           23 W   AERO 23 MPH W   RMY 24
7/8  87/66/77/+5/0.00/814/90        23 W   AERO 23 MPH W   RMY 25
7/9  82/61/72/0/0.00/738/85         22 W   AERO 21 MPH W   RMY 23
7/10 83/61/72/0/0.00/852/98         18 W   AERO 18 MPH W   RMY 18
7/11 84/64/74/+2/0.00/768/88        21 W   AERO 21 MPH W   RMY 23
7/12 89/64/77/+5/0.00/875/97        25 SSW AERO 25 MPH SSW RMY 26
7/13 89/66/78/+6/0.00/604/67        28 S   AERO 27 MPH S   RMY 29
7/14 90/69/80/+8/0.00/521/58        24 W   AERO 22 MPH W   RMY 23
7/15 91/68/80/+8/T/539/60           18 SW  AERO 18 MPH SSW RMY 20
7/16 91/70/81/+9/T/771/86           23 NW  AERO 23 MPH NW  RMY 24
7/17 95/71/83/+11/0.00/831/93       33 SSW AERO 33 MPH SSW RMY 35
7/18 91/69/80/+8/1.45/.../..        40 NE  AERO 39 MPH NE  RMY 41 TSTM
 
7/19 morning low temp: 63F; the normal low is now 63F
 
* Thunderstorm days added
 
DAILY RECORDS FOR JULY 2012
None so far.
 
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: Robert Skilling, Jonathan O'Brien,
William Wilson, Joey McNamara