Saturday, September 14, 2013
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, SEPTEMBER 14, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME
MOSTLY CLOUDY AND COOL TODAY
It has been a mostly cloudy day on the summit today, with numerous
stratocumulus clouds limiting sunshine, especially early this afternoon.
The air has certainly had a fall-like feel to it today, with a cool morning
low of 54F and temperatures only rising to 65F so far today thanks to the
limited sunshine and a cool WNW breeze, which has averaged about 10mph so far
today. The air has also been much drier today, with dew points only running
in the low-mid 50s, after four days of dew point values mostly in the 60s and
low 70s. Visibility has been good today, averaging about 70 miles. The
barometric pressure has been rising today after it fell below 29.00 inches
at station level yesterday for the first time since July 24.
Showers and thunderstorms Thursday and Friday brought a total of 0.64 inches
of rain, with 0.47 inches falling on Thursday and an additional 0.17 inches
yesterday. The monthly total is now right at 3.50 inches, close to two
inches above normal.
Today’s Observations:
7 A.M.
Weather: Broken stratocumulus, altocumulus castellanus NNE-E, altocumulus
lenticularis NW-NE
Temperature: 56F; Dew Point: 52F; Wind: NW at 9 kts
Sea-level pressure: 29.88 ins. Hg, rising then rising more slowly
Visibility: 70 miles
24-hr precip: 0.05 inch
6-hr min. temp: 54F
BHO SA 1155 E30 70 BKN 70 117/56/52/3109/988/ ACC NNE-E ACSL NW-NE/ 8/580/
51020 MANUAL 70005 ASOS 70006 10057 20054
10 A.M.
Weather: Broken stratocumulus (two levels), few moderate tops E-SE. few
cumulus distant N
Temperature: 63F; Dew Point: 53F; Wind: NW at 6 kts,
Wind: Direction variable WNW-N
Sea-level pressure: 29.91 ins. Hg, rising then rising more rapidly
Visibility: 70 miles, light distant haze
BHO SA 1455 E30 BKN 40 BKN 70 130/63/53/3206/991/ FEW MDT TOPS E-SE
FEW CU DSNT N LGT DSNT HZ WND 29V36/ 8/500 53013
1 P.M.
Weather: Overcast stratocumulus, few breaks in overcast E
Temperature: 63F; Dew Point: 53F; Wind: WNW at 8 kts,
Wind: Direction variable WSW-NNW
Sea-level pressure: 29.93 ins. Hg, rising then rising more slowly
Visibility: 70 miles, light distant haze
6-hr max. temp: 65F
BHO SA 1755 E30 OVC 70 136/63/53/2908/993/ FEW BINOVC E LGT DSNT HZ
WND 25V34/ 8/500 51006 10065 20056
WEATHER SUMMARY FOR FRIDAY, SEPTEMBER 13, 2013
TEMPERATURE (DEGREES F)
MAX…..79 NORMAL…..73
MIN…..58 NORMAL…..56
MEAN….69 NORMAL…..64
DEPARTURE FROM 30-YEAR NORMAL………………….+5
TOTAL DEPARTURE FOR THE MONTH………………….+14 [+0.89 DEGREE/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..4 DEPARTURE………+2
TOTAL COOLING UNITS FOR THE MONTH………….54 DEPARTURE……..+15
TOTAL COOLING UNITS FOR THE SEASON………..694 DEPARTURE…….+118
TOTAL COOLING UNITS LAST SEASON TO DATE……759 DIFFERENCE…….-65
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………24 NNW AT 6:29 P.M.
AERO…………………..25 NNW AT 4:25 P.M.
ASOS…………………..25 NNW AT 6:31 P.M.
DAVIS………………….22 NW AT 4:25 P.M. RMY 23
FASTEST MILE FOR YESTERDAY………………..18 NNW AT 4:27 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..17 NNW AT 6:32 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….15 NNW AT 6:32 P.M.
AVERAGE WIND SPEED AND DIRECTION………….7.5 NNW
ASOS………………….6.9
DAVIS…………………6.3 WNW [295 degrees]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.05 DEPARTURE………….-0.08
ASOS…………..0.06
TOTAL PRECIPITATION FOR THE MONTH……….3.50 DEPARTURE………….+1.88
ASOS…………..3.62
TOTAL PRECIPITATION FOR THE YEAR……….41.51 DEPARTURE………….+4.87
ASOS…………..N/A*
*ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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
9/1 76/67/72/+4/2.32/008/01 33 S AERO 39 MPH S RMY 38 TSTM
9/2 79/67/73/+5/0.43/056/07 30 SSE AERO 33 MPH SSE RMY N/A TSTM
9/3 79/61/70/+3/0.00/219/28 28 S AERO 29 MPH S RMY 30 TSTM
9/4 78/57/68/+1/0.00/733/94 24 W AERO 25 MPH W RMY 25
9/5 66/51/59/-8/0.08/179/23 20 NNE AERO 20 MPH NNE RMY 21
9/6 68/46/57/-10/0.00/751/97 18 WSW AERO 17 MPH WSW RMY N/A
9/7 78/51/65/-1/0.00/594/77 20 WSW AERO 21 MPH WSW RMY 21
9/8 74/50/62/-4/0.00/646/84 31 NW AERO 33 MPH NW RMY 32
9/9 69/47/58/-8/T/529/69 23 SW AERO 23 MPH SSW RMY N/A
9/10 73/56/65/0/0.03/007/01 30 S AERO 32 MPH S RMY 33
9/11 93/68/81/+14/0.00/654/86 25 SW AERO 27 MPH SW RMY N/A
9/12 85/66/76/+11/0.47/…/.. 32 S AERO 33 MPH S RMY 34 TSTM
9/13 79/58/69/+5/0.17/…/.. 24 NNW AERO 25 MPH NNW RMY 23
9/14 morning low temp: 54F; the normal low is now 55F
DAILY RECORDS FOR SEPTEMBER 2013
9/1 – NEW DAILY RECORD MAXIMUM PRECIPITATION OF 2.32 INCHES;
surpasses previous record of 1.60 inches set in 1927
9/11 – TIED DAILY RECORD MAXIMUM HIGH TEMPERATURE OF 93F;
ties record of 93F set in 1983
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR SEPTEMBER 14
HIGH 90F IN 1931
LOW 34F IN 1911
PRECIP 4.38 INCHES IN 1944 (Great Atlantic Hurricane in 1944)
PEAK GUST 96e MPH E IN 1944 (Great Atlantic Hurricane in 1944)
RECORDS FOR SEPTEMBER 15
HIGH 89F IN 1931
LOW 35F IN 1913
PRECIP 3.93 INCHES IN 1904 (Extra-tropical storm making landfall in New
England on 9/15/1904 passing east of BHO and bringing a storm total of
4.11 inches 9/14-15/1904)
PEAK GUST 65e MPH NW, WSW IN 1944 (In the wake of Great Atlantic Hurricane)
TODAY’S REPORT PREPARED BY: Jonathan O’Brien
