Friday, September 12, 2014
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, SEPTEMBER 12, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME
COOLER AND MUCH DRIER AIR MASS ARRIVES OVERNIGHT
INTO EARLY THIS MORNING WITH NOT A DROP OF RAIN
After a high of 78F yesterday temperature were in the 70’s
with dew points in the upper 60’s early but falling sharply
after the passage of a dry cold front.
Yesterday was mostly cloudy but today is very sunny and
clear with dew points falling into the 40’s on light NW-N
winds by early this afternoon.
During August we had only 38% of normal precipitation and
that percentage continues to drop toward 30% with just 0.03
inch of rain so far in September compared to a normal to this
date of 1.35 inches.
Today’s Observations:
7 A.M.
Weather: Clear, few cumulus fractus forming ENE-ESE, stratocumulus
distant W-NW, altocumulus/altocumulus lenticularis distant all
quadrants, mountain in cloud 70 NW
Temperature: 59F; Dew Point: 50F; Wind: NNW at 13 kts,
Sea-level pressure: 30.05 ins. Hg, rising then more quickly
Visibility: 70 miles, mountain in clouds 70 NW
6-hr max temp: 59F
6-hr min temp: 55F
24-hr precip: 0.00
BHO SA 1155 CLR 70 176/59/50/3313/005/ FEW CUFRA FRMG ENE-ESE
SC DSNT W-NW AC/ACSL DSNT ALQDS MTN INCLD 70 NW/
8/140 53022 10060 20055
10 A.M.
Weather: Clear, altocumulus/altocumulus in patches mostly distant
in all quadrants
Temperature: 65F; Dew Point: 47F; Wind: N at 11 kts,
Wind: Direction variable NNW-NE
Sea-level pressure: 30.09 ins. Hg, rising then more slowly
Visibility: 80 miles
BHO SA 1455 CLR 80 191/65/47/3611/009/ PTCHS MSTLY DSNT AC/ACSL
WND 34V04/ 8/040 51015
1 P.M.
Weather: Clear, few stratocumulus/small cumulus distant NNE-SSE,
few cirrus S-SW and WSW-NNE
Temperature: 68F; Dew Point: 45F; Wind: NE at 4 kts,
Wind: Light
Sea-level pressure: 30.09 ins. Hg, steady
Visibility: 85 miles
6-hr max. temp: 69F
6-hr min. temp: 59F
BHO SA 1755 CLR 85 191/68/45/0404/009/ FEW SC/CU DSNT NNE-SSE
FEW CI S-SW AND WSW-NNE WND LGT/ 8/801 50000 10069 20059
WEATHER SUMMARY FOR THURSDAY, SEPTEMBER 11, 2014
TEMPERATURE (DEGREES F)
MAX…..78 NORMAL…..73
MIN…..60 NORMAL…..56
MEAN….69 NORMAL…..65
DEPARTURE FROM 30-YEAR NORMAL…………………….+4
TOTAL DEPARTURE FOR THE MONTH……………………+69 [+6.1 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..4 DEPARTURE………..+2
TOTAL COOLING UNITS FOR THE MONTH………….86 DEPARTURE……….+51
TOTAL COOLING UNITS FOR THE SEASON………..565 DEPARTURE………..-7
TOTAL COOLING UNITS LAST SEASON TO DATE……679 DIFFERENCE……..-114
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0 DEPARTURE……….-3
TOTAL HEATING UNITS FOR THE MONTH……………0 DEPARTURE………-19
TOTAL HEATING UNITS FOR THE SEASON…………..2 DEPARTURE………-42
TOTAL HEATING UNITS LAST SEASON TO DATE……..36 DIFFERENCE……..-34
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………31 SW AT 2:28 P.M.
ASOS…………………..34 SSW AT 12:22 P.M.
DAVIS………………….34 S AT 12:22 P.M. RMY 35
FASTEST MILE FOR YESTERDAY………………..26 SW AT 2:29 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..26 SW AT 2:29 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….25 SSW AT 2:29 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..13.9 S
ASOS…………………..13.8
DAVIS………………….12.4 SSW [200 deg)
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE……….-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR SEPTEMBER……….0.03 DEPARTURE……….-1.32
ASOS…………..0.02
TOTAL PRECIPITATION FOR THE YEAR……….31.21 DEPARTURE……….-5.16
ASOS………….31.45
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY GUST
RMY: R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
9/1 88/69/79/+11/0.00/710/90 16 W RMY 19
9/2 91/70/81/+13/0.00/495/63 24 S RMY 27 TSTM
9/3 83/67/75/+8/0.00/681/87 24 NW RMY 27
9/4 86/61/74/+7/0.00/758/97 20 SW RMY 22
9/5 89/66/78/+11/0.00/731/94 25 SSW RMY 29
9/6 90/67/79/+12/T/481/62 33 SSW RMY 36 TSTM
9/7 77/62/70/+4/0.03/687/89 26 NW RMY N/A
9/8 74/57/66/+0/0.00/601/78 25 ENE RMY 25
9/9 71/59/65/-1/0.00/384/50 23 ENE RMY 23
9/10 71/58/65/0/0.00/…/.. 20 NE RMY 20
9/11 78/60/69/+4/0.00/…/.. 31 SW RMY 35
9/12 morning low temp: 55F since midnight; normal low now 56F
DAILY RECORDS FOR SEPTEMBER 2014:
None so far.
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR SEPTEMBER 12
HIGH 92F IN 1961
LOW 42F IN 1958,1967,1985
PRECIP 2.79 INCHES IN 1960 (HURRICANE DONNA)
PEAK GUST 140 MPH SSE IN 1960 (HURRICANE DONNA)
RECORDS FOR SEPTEMBER 13
HIGH 91F IN 1957
LOW 40F IN 1985
PRECIP 3.10 INCHES IN 1987
PEAK GUST 44 MPH WNW IN 1986
TODAY’S REPORT PREPARED BY: Robert Skilling
