Friday, August 9, 2013

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, AUGUST 9, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME

HEAVY RAINFALL TODAY WHILE TEMPS HOVER AROUND 70F

After a relatively calm day yesterday weather-wise, a low pressure
system moved into the Metro Boston area this morning bringing significant
precipitation. As of 12PM this afternoon, approximately 0.53 inches of
rain has been measured, which more than doubles the current monthly total for
August. Rainfall became especially heavy starting around 11:30 AM EDT, although
no thunder was heard near the summit.

Meanwhile, after briefly dipping into the 60s overnight, the air temperature
has hovered at 71F for most of the day today. Winds have been moderate out of
the S-SSE, averaging 14 MPH since 8:00 AM EDT and gusting to as high as 30 MPH.
Skies should clear in time for this weekend, with temperatures expected to be
in the low to mid-80s.

Today’s Observations:

7 A.M.
Weather: Overcast stratocumulus, few lower stratocumulus, very light rain and thin fog
Temperature: 71F; Dew Point: 70F; Wind: S at 13 kts
Sea-level pressure: 30.00 ins. Hg, decreasing then decreasing more slowly
Visibility: 15 miles, except 30 miles ENE-SE
6-hr min. temp: 70F
24-hr precip: Trace
BHO SA 1155 E9 OVC 15L- 160/71/70/1713/000/ FEW LWR SC THN FOG VSBY ENE-SE 30 8/6//
MANUAL 7000/ 56002 10071 20070

10 A.M.
Weather: Full obscurement with heavy fog and light rain
Temperature: 71F; Dew Point: 71F; Wind: SSE at 14G18 kts
Sea-level pressure: 29.95 ins. Hg, decreasing then decreasing more rapidly
Visibility: 1/8 miles, light rain and fog
3-hr precip: 0.15 inch
BHO SA 1455 W3 X 1/8R-F 143/71/71/1514G18/995/ STRA DRFTNG OVR SMT 8//// 58017
ASOS 60014 MANUAL 60015

WEATHER SUMMARY FOR THURSDAY, AUGUST 8, 2013

TEMPERATURE (DEGREES F)
MAX…..79     NORMAL…..80
MIN…..62     NORMAL…..63
MEAN….71     NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL……………….-1
TOTAL DEPARTURE FOR THE MONTH………………-20 [-2.7 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY………….6    DEPARTURE………-1
TOTAL COOLING UNITS FOR THE MONTH…………36    DEPARTURE……..-21
TOTAL COOLING UNITS FOR THE SEASON……….519    DEPARTURE…….+111
TOTAL COOLING UNITS LAST SEASON TO DATE…..538    DIFFERENCE…….-19

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY…………….25 S   AT   7:22 A.M.
AERO…………………25 S   AT   7:22 A.M.
ASOS…………………26 S   AT   7:00 A.M.
DAVIS………………..26 S   AT   2:18 P.M. RMY 30
FASTEST MILE FOR YESTERDAY………………21 S   AT   7:00 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………21 S   AT   7:01 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………..19 S   AT   7:01 A.M.
AVERAGE WIND SPEED AND DIRECTION………. 13.9 S
ASOS………………..13.5
DAVIS……………….12.6 S [187 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…Trace   DEPARTURE…………-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.32   DEPARTURE…………-0.86
ASOS…………..0.32
TOTAL PRECIPITATION FOR THE YEAR……….35.61   DEPARTURE…………+3.44
ASOS…………..N/A*
*ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals

PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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

8/1  81/62/72/0/0.01/503/58          25 S   AERO 26 MPH S   RMY 27
8/2  81/62/72/0/0.23/518/60          26 W   AERO 26 MPH W   RMY 28
8/3  77/63/70/-2/T/276/32            22 WSW AERO 23 MPH WSW RMY 23
8/4  79/58/69/-3/T/645/75            25 WNW AERO 21 MPH WNW RMY 26
8/5  75/54/65/-7/0.00/…/..         26 WNW AERO 25 MPH WNW RMY 27
8/6  78/56/67/-5/0.00/…/..         17 ESE AERO 15 MPH S   RMY 16
8/7  80/59/70/-2/0.00/…/..         21 S   AERO 21 MPH S   RMY 26
8/8  79/62/71/-1/0.08/…/..         25 S   AERO 25 MPH S   RMY 30

8/9  morning low 69F, normal low: 63F

DAILY RECORDS FOR AUGUST 2013
None so far.

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

RECORDS FOR AUGUST 9
HIGH 100F IN 1949
LOW 49F IN 1899
PRE 2.65 INS IN 1976
PEAK GUST 90 MPH SW IN 1968

RECORDS FOR AUGUST 10
HIGH 101F IN 1949 [STATION RECORD MAXIMUM – Tied with 8/2/1975] LOW 49F IN 1964
PRE 2.27 INS IN 1952
PEAK GUST 88e MPH S IN 1976

TODAY’S REPORT PREPARED BY: Eli Melaas