Saturday, September 28, 2013
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, SEPTEMBER 28, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME
CLEAR COOL MORNING WARMS TO 70F
FAIR WEATHER CUMULUS DEVELOP THROUGHOUT THE DAY
A crystal clear morning granted visibility estimated around 90 miles, with
the tree line on Grand Monadnock crisply visible! A light haze developed as
the morning progressed and light mixing produced some scattered cumulus
to our south and west. Temperatures climbed steadily, leveling off near 70
degrees at the afternoon observation.
Today’s Observations:
7 A.M.
Weather: Clear with few cirrus in the vicinity of the observatory
and N-E-S
Temperature: 54F; Dew Point: 50F; Wind: N at 10 kts.
Sea-level pressure: 30.32 ins. Hg, decreasing then increasing
Visibility: 90 miles
6-hr min. temp: 52F
BHO SA 1155 CLR 90 269/54/50/0110/032/ FEW CI IN VCY AND N-E-S/
8/001 53013 10054 20052
10 A.M.
Weather: Clear with few cirrus ESE-SSE and few cumulus fractus distant
SW-NNW
Temperature: 65F; Dew Point: 54F; Wind: NNE at 5 kts,
Wind: Light and direction variable NW-ENE
Sea-level pressure: 30.35 ins. Hg, increasing
Visibility: 80 miles
BHO SA 1455 CLR 80 276/65/54/0204/035/ FEW CI ESE-SSW
FEW CUFRA DSNT SW-NNW WND LGT AND VBL/ 8/001 51007
1 P.M.
Weather: Scattered cumulus/cumulus fractus SE-W-N and distant offshore E-SE
Temperature: 70F; Dew Point: 54F; Wind: ESE at 8 kts,
Wind: Direction variable NNW-SE
Sea-level pressure: 30.32 ins. Hg, rising then falling
Visibility: 70 miles, light distant haze
6-hr max. temp: 70F
BHO SA 1755 50 SCT 70 267/70/54/0608/032/ SCT CU/CUFRA SE-W-N AND
DSNT OFSHR E-SE LT DSNT HZ/ 8/2// 58009 10070 20054
WEATHER SUMMARY FOR FRIDAY, SEPTEMBER 27, 2013
TEMPERATURE (DEGREES F)
MAX…..64 NORMAL…..67
MIN…..52 NORMAL…..50
MEAN….58 NORMAL…..59
DEPARTURE FROM 30-YEAR NORMAL…………………-1
TOTAL DEPARTURE FOR THE MONTH………………..-27 [-1.0 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..0 DEPARTURE………-1
TOTAL COOLING UNITS FOR THE MONTH………….56 DEPARTURE………-2
TOTAL COOLING UNITS FOR THE SEASON………..696 DEPARTURE…….+101
TOTAL COOLING UNITS LAST SEASON TO DATE……765 DIFFERENCE…….-69
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..7 DEPARTURE……….0
TOTAL HEATING UNITS FOR THE MONTH…………117 DEPARTURE……..+23
TOTAL HEATING UNITS FOR THE SEASON………..129 DEPARTURE……..+10
TOTAL HEATING UNITS LAST SEASON TO DATE…….67 DIFFERENCE…….+62
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………21 NE AT 12:39 P.M.
AERO…………………..20 NE AT 12:40 P.M.
ASOS…………………..22 NE AT 12:40 P.M.
DAVIS………………….20 NNE AT 12:39 P.M. RMY 20
FASTEST MILE FOR YESTERDAY………………..13 ENE AT 2:11 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..15 ENE AT 1:21 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….14 ENE AT 1:02 P.M.
AVERAGE WIND SPEED AND DIRECTION………….7.4 NE
ASOS………………….6.9
DAVIS…………………6.5 NE [22 degrees]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE………….-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.91 DEPARTURE………….+0.28
ASOS…………..4.04
TOTAL PRECIPITATION FOR THE YEAR……….41.92 DEPARTURE………….+3.27
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/+16/0.00/654/86 25 SW AERO 27 MPH SW RMY N/A
9/12 85/66/76/+11/0.47/455/60 32 S AERO 33 MPH S RMY 34 TSTM
9/13 79/58/69/+5/0.17/242/32 24 NNW AERO 25 MPH NNW RMY 23
9/14 67/52/60/-4/0.00/361/48 21 NW AERO 21 MPH NW RMY 21
9/15 70/48/59/-5/0.00/547/73 17 WSW AERO 18 MPH WSW RMY 20
9/16 66/46/56/-7/0.02/179/24 29 NNW AERO 31 MPH NNW RMY 30
9/17 60/40/50/-13/0.00/722/97 27 NNE AERO 27 MPH NNE RMY 26
9/18 73/47/60/-2/0.00/726/98 18 W AERO 18 MPH WSW RMY 20
9/19 78/51/65/+3/0.00/731/99 17 WSW AERO 16 MPH WSW RMY 18
9/20 78/54/66/+4/0.00/706/96 18 SSW AERO 18 MPH SSW RMY 23
9/21 74/57/66/+4/T/512/70 35 S AERO 40 MPH S RMY N/A
9/22 70/49/60/-1/0.39/365/50 38 S AERO 39 MPH S RMY 42
9/23 63/43/53/-7/0.00/711/98 25 NW AERO 26 MPH NW RMY 28
9/24 65/40/53/-7/0.00/702/97 22 ENE AERO 22 MPH ENE RMY 23
9/25 64/45/55/-5/0.00/512/71 18 N AERO 18 MPH N RMY 19
9/26 63/52/58/-1/0.00/…/.. 16 ENE AERO 14 MPH ENE RMY 16
9/27 64/52/58/-1/0.00/…/.. 21 NE AERO 20 MPH NE RMY 20
9/28 our morning low temp: 52F; the normal low is now 50F
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 28
HIGH 82F IN 1959
LOW 33F IN 1897,1947
PRECIP 2.46 INCHES IN 2004
PEAK GUST 69 MPH NE IN 1962
RECORDS FOR SEPTEMBER 29
HIGH 85F IN 1952
LOW 28F IN 1914 (SEPTEMBER MINIMUM RECORD)
PRECIP 2.61 INCHES IN 1907
PEAK GUST 62 MPH S IN 2005
TODAY’S REPORT PREPARED BY: Forrest Iwanik
