BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JULY 8, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME
 
4-DAY HEAT WAVE ENDS WITH A 91F ON SUNDAY
OPPRESSIVE HUMIDITY WITH DEW POINTS IN 70'S
THIS MORNING'S LOW TEMP WAS. 73F; NORMAL LOW 63F 
WEAK BACK DOOR FRONT ARRIVES AT SUMMIT AT 11:40 A.M.
 
Yesterday's high of 91 degrees marked the end of our
4-day heat wave which began on July 4. A very warm and
humid first week of July has averaged almost 8 degrees
warmer than normal.
 
The overnight low temperature recorded this morning
of 73F was 10 degrees above the normal for this date.
 
A back-door cold front passed over the summit at close
to 11:40 A.M. late this morning with a sudden wind shift
from WSW to ENE but with no gusts.  The cooler air mass
from off the ocean is checking the high temperature
in the low 80's but with continued humid conditions
The dew points have remained in the lower 70's into
early this afternoon and visibility has dropped to
only 10 miles in haze in the wake of the frontal passage.
 
Today's Observations:
 
7 A.M.
Weather: Scattered dense cirrus, scattered cirrus, line of
altocumulus castellanus WNW-N, few altocumulus lenticularis,
dense cirrus W-N-E, mostly clear sky ESE-SW  
Temperature: 76F; Dew Point: 72F; Wind: WSW at 8 kts.
Sea-level pressure: 29.96 ins. Hg, rising slowly
Visibility: 20 miles, hazy, dark smoke layer along and
above horizon SW-NE
6-hour min. temp: 73F
24-hour precip: 0.21 in.
BHO SA 1155 220 SCT 250 SCT 20 145/76/72/2508/996/ LINE ACC XTDNG 
DSNT WNW-N FEW ACSL DSNT NE-ESE PTCHS DNS CI W-N-E MSTLY CLR SKY 
ESE-SW DRK K LYR ALG/ABV HRZN SW-NW THN F HAZY ALQDS/ 8/082 52008 
ASOS 70021 MANUAL 70021 10076 20073
 
10 A.M.
Weather: Scattered stratocumulus, cumulus, moderate cumulus,
towering cumulus distant NNW-N S, moderate cumulus all quadrants,
scattered dense cirrus, overcast cirrus thin spots in overcast 
Temperature: 81F; Dew Point: 74F; Wind: WNW at 4 kts,
Sea-level pressure: 29.97 ins. Hg, rising
Visibility: 15 miles, hazy
BHO SA 1455 20 SCT 30 SCT E220 BKN 250 OVC 15 150/81/74/2904/997/
FEW TCU DSNT NNW-N MDT CU ALQDS THN SPTS IOVC VSBY N-E 12
VSBY WNW 20 WND LGT/ 8/202 51005 
 
1 P.M.
Weather: Scattered cumulus, moderate cumulus, towering cumulus
all quadrants, shower(s) rain vicinity of station NE-SE 
Temperature: 80F; Dew Point: 73F; Wind: ENE at 9 kts,
Wind: Direction variable NNE-E
Sea-level pressure: 29.98 ins. Hg, rising then falling slightly
Visibility: 10 miles, hazy, shower(s) of rain vicinity NE-SE
6-hour max. temp: 82F 
BHO SA 1755 38 SCT 200 SCT 250 BKN 10 153/80/73/0609/998/ TCU/MDT ALQDS
VCSH NE-SE HAZY ALQDS WND 03V09/ 8/202 50003 10082 20076
 
WEATHER SUMMARY FOR SUNDAY, JULY 7, 2013
 
TEMPERATURE (DEGREES F)
MAX.....91     NORMAL.....80
MIN.....72     NORMAL.....62
MEAN....82     NORMAL.....71
 
DEPARTURE FROM 30-YEAR NORMAL....................+11
TOTAL DEPARTURE FOR THE MONTH....................+55 [+7.7 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY................38 SSW AT  4:32 P.M. * 
                   AERO.....................43 SSW AT  4:32 P.M. 
                   ASOS.....................41 SSW AT  4:31 P.M.
                   DAVIS....................41 S   AT  4:30 P.M. RMY 44
FASTEST MILE FOR YESTERDAY..................31 SSW AT  4:32 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...............31 SSW AT  4:31 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..............30 SSW AT  4:33 P.M.
AVERAGE WIND SPEED AND DIRECTION...........8.4 W
                   ASOS....................8.2 
                   DAVIS...................7.7 W  [260 deg]
* last of several occurrences...
  all gusts were thunderstorm gusts
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.21   DEPARTURE...........+0.10
                         ASOS..............0.21
TOTAL PRECIPITATION FOR THE MONTH..........0.26   DEPARTURE...........-0.50
                         ASOS..............0.26
TOTAL PRECIPITATION FOR THE YEAR..........32.46   DEPARTURE...........+4.73
                         ASOS..............N/A*
*ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals 
     
PRELIMINARY CLIMATE SUMMARY FOR JULY 2013 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  82/69/76/+6/0.05/.../..         29 S   AERO 31 MPH SSW RMY 32
7/2  82/61/72/+2/T/.../..            23 SSW AERO 23 MPH SSW RMY 25
7/3  87/62/75/+4/T/.../..            28 SW  AERO 30 MPH SW  RMY 30
7/4  90/71/81/+10/0.00/.../..        25 WSW AERO 26 MPH SW  RMY 28
7/5  92/73/83/+12/0.00/.../..        24 W   AERO 25 MPH WSW RMY 25
7/6  90/72/81/+10/0.00/.../..        25 WNW AERO 25 MPH WNW RMY 26
7/7  91/72/82/+11/0.21/.../..        38 SSW AERO 43 MPH SSW RMY 44 TSTM
 
7/8  morning low temp: 73F; the normal low is now 63F
 
DAILY RECORDS FOR JULY 2013
None so far.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JULY 8
HIGH 95F IN 1981
LOW 50F IN 1919
PRECIP 1.74 INCHES IN 1916
PEAK GUST 46e SSW IN 1941
 
RECORDS FOR JULY 9
HIGH 98F IN 1912
LOW 47F IN 1909
PRECIP 3.74 INS IN 1921
WIND 46 MPH NW IN 1992
 
TODAY'S REPORT PREPARED BY: Robert Skilling/Marc Douglas