BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JUNE 5, 2010  
ALL TIMES ARE IN EASTERN STANDARD TIME 

WARM AND HUMID WEATHER TODAY...THUNDERSTORMS 
BRING HEAVY RAIN AND VIVID LIGHTNING TO THE 
AREA EARLY THIS MORNING...MUCH OF NEW ENGLAND 
UNDER A TORNADO WATCH THROUGH THIS EVENING...
A strong thunderstorm brought a vivid lightning
display from 3-4 AM EDT to Boston and much of 
the surrounding area early this morning.  Blue
Hill received a total of 0.16 inch in heavy
rain showers, much of it falling in a ten minute
period from 3:25-3:35 AM EDT. A sudden peak wind
gust to 32 mph W was measured at 3:24 AM EDT as
the storm approached from the west, then passed
mostly to the north of the Observatory.  Partial
sunshine has raised the temperature into the
low 80s today and a southerly wind has helped
to push the dew point into the low 70s as of
early afternoon. The unstable conditions may
generate strong or severe thunderstorms across
the area, and the NWS has raised a tornado watch 
for much of New England through 10 PM EDT today. 
 

Today's observations:

7 A.M. 
Weather: Sky obscured with heavy fog  
Temperature: 65F, Dew point: 65F, Wind: S at 11 kts
Sea-level pressure: 29.69 inches Hg, falling
Visibility: 1/8 mile , variable 1/16-1/4 mile 
6-hour minimum temp: 63F  
24-hour rainfall: 0.16 inch 
BHO SA 1155 W2 X 1/8VF 053/65/65/1711/969/ VSBY 1/16V1/4 
VSBY INCR RE20/ 8//// 58017 6016/ 70016 10066 20063

10 A.M.  
Weather: Scattered cumulus, scattered stratocumulus,
broken altocumulus, few cirrus, few altocumulus
lenticularis SSE-S, few moderate cumulus W, hazy
Temperature: 74F, Dew point: 69F, Wind: SSW at 10 kts
Sea-level pressure: 29.69 inches Hg, steady
Visibility: 10 miles, SE-S 15, hazy
BHO SA 1455 12 SCT 20 SCT E110 BKN 180 BKN 10 053/74/69/
2010/969/ FEW CI FEW ACSL SSE-S FEW MDT CU W VSBY SE-S 15 
HAZY/ 8/571 58000

1 P.M.   
Weather: Scattered cumulus, scattered moderate cumulus, 
broken altocumulus, broken cirrus, few towering cumulus
overhead-N, hazy   
Temperature: 78F, Dew point: 71F, Wind: S at 10 kts
Sea-level pressure: 29.65 inches Hg, falling
Visibility: 10 miles, hazy 
6-hour max. temp: 82F  
BHO SA 1755 30 SCT 45 SCT E160 BKN 230 BKN 10 041/78/71/
1810/965/ FEW TCU OVHD-N MDT CU ALQDS FEW CUFRA HAZY/ 8/271 
56012 10082 20065

 
WEATHER SUMMARY FOR FRIDAY, JUNE 4
 
TEMPERATURE (DEGREES F)
MAX.....84     NORMAL.....73
MIN.....59     NORMAL.....53
MEAN....72     NORMAL.....63 
 
DEPARTURE FROM 30-YEAR AVERAGE................+9
TOTAL DEPARTURE FOR THE MONTH................+33 [+8.1 DEGREES/DAY] 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............0   DEPARTURE........-4
TOTAL HEATING UNITS FOR THE MONTH.............0   DEPARTURE.......-18 *
TOTAL HEATING UNITS FOR THE SEASON.........5641   DEPARTURE......-674
TOTAL HEATING UNITS LAST SEASON TO DATE....6136   DIFFERENCE.....-495
* Monthly heating units corrected from yesterday's report
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............23 SSW AT  5:43 P.M.
                   AEROVANE..............26 SSW AT  5:43 P.M.
                   ASOS..................24 SSW AT  5:44 P.M.
                   DAVIS.................24 S   AT  5:43 P.M.
THE FASTEST MILE FOR YESTERDAY...........16 SSW AT  5:44 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............18 SSW AT  5:44 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE...........18 S   AT  5:43 P.M. 
AVERAGE WIND SPEED AND DIRECTION........7.6 S  
                   ASOS.................6.6 
                   DAVIS................5.9 SE [137 DEG] 
* last of several occurrences.
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.16  DEPARTURE......+0.03
                         ASOS..............0.17
TOTAL PRECIPITATION FOR THE MONTH..........1.02  DEPARTURE......+0.50
                         ASOS..............1.02
TOTAL PRECIPITATION FOR THE YEAR..........34.43  DEPARTURE.....+12.17
                         ASOS.............34.50

PRELIMINARY CLIMATE SUMMARY FOR JUNE 2010 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
6/1  82/57/70/+8/0.86/0/.../..  33 WNW AERO 38 MPH WNW TSTM
6/2  80/59/70/+8/0.00/.../..    22 S
6/3  80/59/70/+8/T/.../..       28 S   AERO 31 MPH S 
6/4  84/59/72/+9/0/.../..       23 SSW

6/5  morning low temp: 63F; the normal low is now 53F; TSTM this morning 

NEW DAILY RECORDS FOR JUNE 2010
None to date

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR JUNE 5
HIGH 95F IN 1930
LOW 41F IN 1891
PRECIP 2.83 INS IN 1982
PEAK GUST 57 MPH NNW IN 1988

RECORDS FOR JUNE 6
HIGH 95F IN 1925
LOW 42F IN 1885, 1894, 1920, 1945
PRECIP 3.61 INS IN 2000
PEAK GUST 58 MPH NE IN 2000

TODAY'S REPORT PREPARED BY: Mike Iacono