BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JUNE 7, 2010 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
SEVERE THUNDERSTORMS PASSED TO NORTH OVER THE
WEEKEND AND INCLUDED REPORTS OF HIGH WINDS,
WIND DAMAGE, DOWNPOURS, AND HAIL...
TEMPERATURES FELL RAPIDLY LATE YESTERDAY
AFTER A COLD FRONTAL PASSAGE DROPPING FROM
80F SUNDAY AFTERNOON TO 54F BY MIDNIGHT
EST AND ON DOWN TO 51F EARLY THIS MORNING... 
 
Tornado watches were issued for both days over
the weekend but none were reported in southern
New England. However, severe thunderstorms brought
damaging wind gusts. Sunday afternoon a peak gust
to 68 MPH WSW was recorded at Logan Airport, Boston,
at 4:09 PM. What was confirmed as a macroburst
associated with a severe thunderstorm moved along an 
east-northeast track from northern Connecticut all 
the way to Boston causing widespread wind damage. 
 
Here at Blue Hill a thunderstorm early Saturday
morning left only about a tenth of an inch of rain
but contained considerable lightning. A few distant
rumbles of thunder may have occurred Saturday after-
noon but all of the important storm activity remained
well to our west through north.  The total rainfall
for the day was just 0.16 inch.
 
On Sunday morning a weak back-door cold front crept
in from the northeast with a very light easterly
wind flow holding temperatures in the very humid upper
60's until a warm front quickly passed north of here
between noon and 1 PM EDT with temperatures jumping into
the upper 70's along with increasingly gusty south
winds peaking at speeds of 43 to 48 MPH.  The center
of a stronger than usual low pressure system for this
time of year passed to our north with the lowest
pressure of 29.31 inches MSL recorded at 3:46 PM EDT. 
This was shortly before a severe thunderstorm passed
over Boston with a peak gust of 68 MPH WSW at 4:09 PM EDT.
 
A few light showers accompanied the late afternoon
thunderstorms here with only a total of 0.05 inch.
Peak wind gusts reached 40 to 45 MPH W after the passage
of the cold front at around 6:30 PM EDT.  Temperatures 
dropped rapidly from 75F at 5:30 PM to 55F by midnight EDT. 
 
Today's observations:
 
7 A.M.
Weather: Clear, (SKC), perfectly clear
Temperature: 57F, Dew point: 48F, Wind: WNW at 12G19 kts.
Wind: Direction variable from W to NNW
Sea-level pressure: 29.70 inches Hg, rising
Visibility: 70 miles
6-hour minimum temp: 51F 
24-hour rainfall: 0.07 in.
BHO SA 1155 CLR 70 059/57/48/3012G19/970/ WND 27V34/ 53025
MANUAL 70007 ASOS 70007 10057 20051
 
10 A.M. 
Weather: Clear, cumulus forming all quadrants,
few moderate cumulus west-northwest to northwest,
cirrus distant northwest to north  
Temperature: 66F, Dew point: 46F, Wind: WNW at 11 kts,
Wind: Direction variable WSW to NNW
Sea-level pressure: 29.74 inches Hg, steady 
Visibility: 80 miles 
BHO SA 1455 CLR 80 070/66/46/2911/974/ CUFRA/CU FRMG ALQDS
FEW MDT CU WNW-NW CI DSNT WNW-N WND 25V33/
8/201 50011
 
1 P.M.  
Weather: Scattered cumulus and moderate cumulus,
broken altocumulus generated by cumulus
Temperature: 68F, Dew point: 43F, Wind: W at 9G19 kts,
Wind: Direction variable WSW to NW
Sea-level pressure: 29.74 inches Hg, rising
Visibility: 80 miles
6-hour max. temp: 72F
BHO SA 1755 65 SCT E90 BKN 80 071/68/43/2809G19/974/
MDT CU/ACCU ALQDS WND 24V32/ 8/260 53001 10072 20057
 
WEATHER SUMMARY FOR SUNDAY, JUNE 6
 
TEMPERATURE (DEGREES F)
MAX.....80     NORMAL.....73
MIN.....54     NORMAL.....53
MEAN....67     NORMAL.....63
 
DEPARTURE FROM 30-YEAR AVERAGE................+4
TOTAL DEPARTURE FOR THE MONTH................+47 [+7.6 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............0   DEPARTURE........-4
TOTAL HEATING UNITS FOR THE MONTH.............0   DEPARTURE.......-26
TOTAL HEATING UNITS FOR THE SEASON.........5641   DEPARTURE......-682
TOTAL HEATING UNITS LAST SEASON TO DATE....6146   DIFFERENCE.....-505
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............43 S AT  1:16 P.M.
                   AEROVANE..............48 S AT  1:16 P.M.
                   ASOS..................46 S AT  1:16 P.M.
                   DAVIS.................48 S AT  1:29 P.M.
THE FASTEST MILE FOR YESTERDAY...........33 W AT  5:29 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE............32 W AT  5:30 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE...........33 W AT  5:30 P.M. 
AVERAGE WIND SPEED AND DIRECTION........13.7 W  
                   ASOS.................12.7
                   DAVIS................12.4 SW [230 DEG]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.07  DEPARTURE......-0.06
                         ASOS..............0.07
TOTAL PRECIPITATION FOR THE MONTH..........1.09  DEPARTURE......+0.31
                         ASOS..............1.09
TOTAL PRECIPITATION FOR THE YEAR..........34.50  DEPARTURE.....+11.98
                         ASOS.............34.57
 
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/+8/0.86/0/199/22  33 WNW AERO 38 MPH WNW TSTM
6/2  80/59/70/+8/0.00/752/83    22 S
6/3  80/59/70/+8/T/263/29       28 S   AERO 31 MPH S TSTM *
6/4  84/59/72/+9/0/.../..       23 SSW
6/5  83/63/73/+10/0.16/.../..   32 W   AERO 36 MPH W TSTM
6/6  80/54/67/+4/0.07/.../..    43 S   AERO 48 MPH S TSTM
 
* TSTM day not included in previous email reports; 
  added with today's report....
 
6/7  our overnight low temp: 51F; the normal low is now 54F
 
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 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