BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JUNE 7, 2012
ALL TIMES ARE IN EASTERN STANDARD TIME
 
THUNDERSTORM WITH SMALL HAIL EARLY AFTERNOON
 
The cumulus clouds built up to cumulonimbus early
this afternoon and a thunderstorm began at 2:30 P.M.
EDT followed by rain showers at 2:40 P.M. EDT. 
A period of about 5 minutes of small hail (1/8 in)
began at 3:00 p.m. Just under a quarter of an inch
of rain fell with the thunderstorm. Hail began just
after the thunderstorm ended at 2:55 P.M.
 
Today's observations:
 
7 A.M.
Weather: Scattered stratus, scattered altocumulus, scattered cirrus,
thin overcast cirrus, breaks in overcast, thin fog 
Temperature: 56F, Dew Point: 54F; Wind: SW @ 2 kts (estimated)
Wind: Light
Sea-level pressure: 29.99 inches Hg, rising then more rapidly
Visibility: 3 miles, 5 miles N-NE, thin fog
24-hour precip: 0.01 inch
6-hour min. temp: 50F
BHO SA 1155 N/A
 
10 A.M.
Weather: Scattered moderate cumulus, overcast altocumulus,
few castellanus NNE-NE
Temperature: 65F, Dew Point: 51F; Wind: SW 5 kts,
Wind: Light 
Sea-level pressure: 29.97 inches Hg, falling 
Visibility: 40 miles, NNE-NE 20, hazy
west-northwest 55 miles
BHO SA 1455 30 SCT E100 BKN 40 149/65/51/2305/997/ MDT CU ALQDS
FEW ACC NNE-NE FEW ACSL VSBY NNE-NE 20 HAZY WNW-NW 55 WND LGT/
8/280 56004
 
1 P.M.
Weather: Scattered cumulonimbi, scattered altocumulus
cumulogenitus and few lenticularis, cumulonimbus N-E-S
moving SE, towering cumulus overhead, dark bases, broken
cirrus, showers of rain and virga distant NW-NNW and N-E-S
moving southeast
Temperature: 69F, Dew Point: 52F; Wind: SSW at 5 kts,
Wind: Light
Sea-level pressure: 29.93 inches Hg, falling then more rapidly 
Visibility: 35 miles, except 20 miles N-E, 25 miles SE-S
visibility WNW 50 miles, light distant haze, shallow fog
layer estimated top 5 hundred NNE-E moving west into city 
6-hour precip: trace
6-hour max. temp: 69F
BHO SA 1755 40 SCT 60 SCT 90 SCT 150 SCT 250 BKN 35
134/69/52/2105/993/ CBS N-E-S MOVG SE SHRA/VIRGA DSNT NW AND
SHRA/VIRGA N-E-S SHLW FG LYR ESTMTD TOP 5 HND NNE-NE
OVR HARBOR MOVG W TCU OVHD DRK BASES VC STN VSBY N-E 15
WNW 5W WND LGT RB1657E15/ 8/961 58015 MANUAL 6000/
10069 20056  
 
WEATHER SUMMARY FOR WEDNESDAY, JUNE 6
 
TEMPERATURE (DEGREES F)
MAX.....63    NORMAL.....72
MIN.....48    NORMAL.....54
MEAN....56    NORMAL.....63
 
DEPARTURE FROM 30-YEAR NORMAL.......................-7
TOTAL DEPARTURE FOR THE MONTH......................-45 [-7.7 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY...............9   DEPARTURE..........+5
TOTAL HEATING UNITS FOR THE MONTH..............60   DEPARTURE.........+34
TOTAL HEATING UNITS FOR THE SEASON...........4948   DEPARTURE.......-1375
TOTAL HEATING UNITS LAST SEASON TO DATE......6179   DIFFERENCE......-1231
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............16 ENE AT  1:35 P.M. * 
                   AERO..................15 E   AT 12:13 P.M. * 
                   ASOS..................15 ENE AT  2:04 P.M.  
                   DAVIS.................14 E   AT 12:14 P.M. RMY 15
THE FASTEST MILE FOR YESTERDAY...........10 S   AT  6:43 P.M. * 
MAXIMUM 2-MINUTE ASOS AVERAGE............14 NE  AT  2:24 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE...........10 ENE AT  1:39 P.M. 
AVERAGE WIND SPEED AND DIRECTION........7.0 ENE
                   ASOS.................6.7
                   DAVIS................6.4 ENE [070 deg.]
 
* last of several occurrences...
 .
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01  DEPARTURE...........-0.16
                         ASOS..............0.01
TOTAL PRECIPITATION FOR THE MONTH..........1.63  DEPARTURE...........+0.46
                         ASOS..............1.60
TOTAL PRECIPITATION FOR THE YEAR..........14.87  DEPARTURE...........-8.963
                         ASOS.............14.85
 
PRELIMINARY CLIMATE SUMMARY FOR JUNE 2012 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
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
 
6/1  67/53/60/-2/0.00/.../..        28 ENE AERO 28 MPH ENE RMY 29
6/2  63/52/58/-4/0.80/.../..        39 SE  AERO 39 MPH SE  RMY 40
6/3  62/50/56/-6/0.01/.../..        31 N   AERO 28 MPH N   RMY 29
6/4  50/47/49/-14/..../000/00       44 NNE AERO 43 MPH NNE RMY 43
6/5  54/47/51/-12/..../.../..       23 NNE AERO 18 MPH NNE RMY N/A
6/6  63/48/56/-7/0.01/.../..        16 ENE AERO 14 MPH ENE RMY 15 
 
6/7  our morning low temp: 50F; the normal low is now 55F
 
DAILY RECORDS FOR JUNE 2012
6/4 - NEW DAILY RECORD LOW MAXIMUM TEMP OF 50F;
surpasses the previous record of 51F in 1891.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JUNE 7
HIGH 93F IN 1999
LOW 40F IN 1932
PRECIP 4.01 INS IN 2006
PEAK GUST 58 MPH NE IN 1982
 
RECORDS FOR JUNE 8
HIGH 94F IN 1984
LOW 37F IN 1932
PRECIP 1.53 INS IN 1947
PEAK GUST 86e MPH WNW IN 1946 [Record for month]
 
TODAY'S REPORT PREPARED BY: Robert Skilling/William Wilson