Friday, August 30, 2013

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, AUGUST 30, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME

WIND DIRECTION BACKS TO SW OVERNIGHT: CLOUDS LIFTING, TEMPS. WARMING;
TOMORROW MARKS THE 59TH ANNIVERSARY OF HURRICANE CAROL

Late yesterday evening, the wind direction gradually began backing from a
NE direction, becoming a SW wind by sunrise this morning. The change in
wind direction provided for improving conditions: dissipating fog,
decreasing clouds, and increasing temperatures. The high temperature has
reached the upper 70s today, which is about 15-20 degrees warmer than
yesterday afternoon’s temperatures.

The light drizzle and occasional rain showers that persisted much of
yesterday ended with the change in wind direction. A total of 0.05 inch
of rain was recorded yesterday.

Tomorrow, August 31, will mark the 59th anniversary of Hurricane Carol.
A peak wind gust of 125 mph from the SE was measured on the summit. The
sea level pressure bottomed out at 973.2 mb (28.741 inches), and 2.46 inches
of rain was recorded. The windows and the building itself were noted to
have been “plastered with leaves” after the storm.

Today’s Observations:

7 A.M.
Weather: Broken stratus, broken stratocumulus, lower stratus dissipating,
moderate cumulus top visible distant WNW, sun dimly visible, thin fog/haze
all quadrants
Temperature: 60F; Dew Point: 58F; Wind: SW at 7 kts,
Wind: Direction gradually backing over the past hour
Sea-level pressure: 30.00 ins. Hg, rising then falling
Visibility: 12 miles, thin fog/haze all quadrants
24-hr precip: 0.05 inch
6-hr min. temp: 58F
BHO SA 1155 E5 BKN 20 BKN 12 158/60/58/2307/000/ LWR STRA DSPTNG MDT CU
TOP VSBL DSNT WNW SUN DIMLY VSBL THN FG/HZ ALQDS WND GRDLY BACKING PST HR/
8/8// 50000 MANUAL 70005 ASOS 70005 10060 20058

10 A.M.
Weather: Broken stratocumulus, overcast stratus, hazy
Temperature: 67F; Dew Point: 62F; Wind: WSW at 6 kts,
Wind: Direction variable SW-W
Sea-level pressure: 29.98 ins. Hg, rising
Visibility: 20 miles, hazy
BHO SA 1455 E10 BKN 15 OVC 20 152/67/62/2506/998/ HAZY WND 22V28/ 8/5//
58006

1 P.M.
Weather: Scattered cumulus, scattered altocumulus, scattered cirrostratus,
broken thin cirrus, cumulus all quadrants, few altocumulus SE-W,
cirrostratus distant S-SW, hazy
Temperature: 77F; Dew Point: 65F; Wind: WSW at 7 kts,
Wind: Direction variable SSW-WNW
Sea-level pressure: 29.93 ins. Hg, falling
Visibility: 30 miles, hazy
6-hr max. temp: 78F
BHO SA 1755 20 SCT 120 SCT 200 SCT 250 –BKN 30 137/77/65/2507/993/ CU ALQDS
FEW AC SE-W CS DSNT S-SW HAZY WND 21V29/ 8/148 57021 10078 20060

WEATHER SUMMARY FOR THURSDAY, AUGUST 29, 2013

TEMPERATURE (DEGREES F)
MAX…..64 NORMAL…..77
MIN…..58 NORMAL…..60
MEAN….61 NORMAL…..69

DEPARTURE FROM 30-YEAR NORMAL…………………..-8
TOTAL DEPARTURE FOR THE MONTH………………….-32 [-1.3 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..0 DEPARTURE………-4
TOTAL COOLING UNITS FOR THE MONTH…………142 DEPARTURE……..-36
TOTAL COOLING UNITS FOR THE SEASON………..625 DEPARTURE……..+96
TOTAL COOLING UNITS LAST SEASON TO DATE……699 DIFFERENCE…….-74

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY…………….23 NNE AT 11:56 A.M. *
AERO…………………23 NNE AT 11:56 A.M. *
ASOS…………………24 NNE AT 11:57 A.M.
DAVIS………………..22 NNE AT 11 A.M.-12 P.M. RMY 23
FASTEST MILE FOR YESTERDAY………………15 NNE AT 11:41 A.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE……………16 NE AT 11:43 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………..15 NNE AT 11:43 A.M.
AVERAGE WIND SPEED AND DIRECTION………..8.8 NE
ASOS………………..8.7
DAVIS……………….8.1 NE [040 deg.] * last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.05 DEPARTURE………….-0.06
ASOS…………..0.05
TOTAL PRECIPITATION FOR THE MONTH……….2.67 DEPARTURE………….-1.14
ASOS…………..2.71
TOTAL PRECIPITATION FOR THE YEAR……….37.91 DEPARTURE………….+3.16
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/-7/0.00/858/100 26 WNW AERO 25 MPH WNW RMY 27
8/6 78/56/67/-5/0.00/846/99 17 ESE AERO 15 MPH S RMY 16
8/7 80/59/70/-2/0.00/759/89 21 S AERO 21 MPH S RMY N/A
8/8 79/62/71/-1/0.08/153/18 25 S AERO 25 MPH S RMY N/A
8/9 73/70/72/0/2.21/000/00 37 S AERO 39 MPH S RMY 40
8/10 81/61/71/-1/0.00/795/94 30 WNW AERO 31 MPH WNW RMY 31
8/11 78/58/68/-3/0.00/835/99 18 W AERO 18 MPH W RMY 21
8/12 81/62/72/+1/0.00/656/78 18 W AERO 17 MPH WSW RMY 19
8/13 73/64/69/-2/0.02/193/23 16 SSE AERO 15 MPH SSE RMY N/A
8/14 73/57/65/-6/0.00/819/98 35 W AERO 35 MPH W RMY 35
8/15 75/53/64/-7/0.00/800/96 23 W AERO 23 MPH W RMY 24
8/16 77/57/67/-4/0.00/740/89 20 W AERO 19 MPH W RMY 21
8/17 77/59/68/-3/0.00/770/93 18 W AERO 18 MPH W RMY N/A
8/18 80/62/71/0/T/231/28 16 SSW AERO 17 MPH SSW RMY 18
8/19 82/58/70/0/T/494/60 17 W AERO 18 MPH W RMY 20
8/20 85/64/75/+5/0.00/772/94 17 NW AERO 18 MPH NW RMY N/A
8/21 87/65/76/+6/0.00/802/98 18 WSW AERO 18 MPH WSW RMY 18
8/22 84/67/76/+6/0.00/432/53 22 SW AERO 22 MPH SSW RMY N/A
8/23 78/63/70/0/0.00/610/75 25 NNW AERO 25 MPH NNW RMY 24
8/24 73/55/64/-6/0.00/786/97 23 NNE AERO 22 MPH NNE RMY N/A
8/25 82/57/70/+1/0.00/791/98 20 SW AERO 21 MPH SW RMY 21
8/26 80/64/72/+3/T/145/18 26 WSW AERO 26 MPH SW RMY 28
8/27 78/66/72/+3/0.07/329/41 16 NE AERO 15 MPH NE RMY 16
8/28 81/62/73/+3/T/…/.. 26 NE AERO 24 MPH NE RMY 27
8/29 64/58/61/-8/0.05/000/00 23 NNE AERO 23 MPH NNE RMY 23

8/30 morning low temp: 58F; the normal low is now 60F

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 30
HIGH 94F IN 1953
LOW 39F IN 1965
PRECIP 2.75 INCHES IN 1936
PEAK GUST 43 MPH NW IN 1965

RECORDS FOR AUGUST 31
HIGH 94F IN 1953
LOW 42F IN 1976
PRECIP 2.46 INCHES IN 1954
PEAK GUST 125 MPH SE IN 1954 [CAROL – RECORD FOR MONTH]

TODAY’S REPORT PREPARED BY: Sean Fankhauser