Sunday, September 14, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, SEPTEMBER 14, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

THE MOST RAIN TO FALL DURING THE PAST MONTH YESTERDAY…
RAIN LASTED FOR 3 HOURS FROM ABOUT 5 TO 8PM PRODUCING JUST 0.17 INCH…
INCLUDING THIS RAIN THERE HAS BEEN ONLY 12% OF NORMAL SINCE AUGUST 14TH!
TODAY IS THE 70TH ANNIVERSARY OF THE GREAT ATLANTIC HURRICANE OF 1944

The rain which began late yesterday afternoon was briefly moderate
in the hour from 6 to 7 PM EDT but in the end only 0.17 inch
was measured in the gage this morning.

Only 0.47 inch of rainfall had been measured at BHO since
August 14th, which is 12 percent of the normal precipitation
over this 31 day period.

On this date in 1944, one of the strongest hurricanes to impact New England
in the 20th century brought in excess of four inches of rainfall and wind
gusts over 90 mph to the Observatory. The center of the hurricane passed
slightly east of Great Blue Hill.  A total of more than seven inches
of rain fell from the 13-15th September 1944. There was little damage on
the hill except for broken tree branches and washouts on the summit road.

Today’s Observations:

7 A.M.
Weather: Clear, few cumulus fractus forming vicinity NNE-SE, few stratocumulus
along horizon distant WNW-NW, few cumulus stratocumulus distant offshore NE-ESE,
cirrostratus layer distant ESE-S
Temperature: 49F; Dew Point: 47F; Wind: NW at 10 kts
Sea-level pressure: 30.22 ins. Hg, rising then falling
Visibility: 80 miles, mountain in cloud 70 NW
6-hr max temp: 55F
6-hr min temp: 47F
24-hr precip: 0.17 in.
BHO SA 1155 CLR 80 234/49/47/3210/022/ FEW CUFRA FRMG VC NNE-SE
SC DSNT WNW-NW ALG HRZN FEW CU/SC ALG HRZN DSNT OFFSHR NE-SE
CS LYR DSNT ESE-S MTN INCLD 70 NW/ 8/808 51020 MANUAL 70017
ASOS 70016 10055 20047

10 A.M.
Weather: Clear, few distant cumulus/stratocumulus
Temperature: 57F; Dew Point: 44F; Wind: NW at 11 kts
Sea-level pressure: 30.23 ins. Hg, falling
Visibility: 80 miles
BHO SA 1455 CLR 80 236/57/44/3111/023/ FEW DSNT SC/SC/
8/800 50002

WEATHER SUMMARY FOR SATURDAY, SEPTEMBER 13, 2014

TEMPERATURE (DEGREES F)
MAX…..67    NORMAL…..73
MIN…..50    NORMAL…..56
MEAN….59    NORMAL…..64

DEPARTURE FROM 30-YEAR NORMAL…………………….-5
TOTAL DEPARTURE FOR THE MONTH……………………+61 [+4.5 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..0   DEPARTURE………..-2
TOTAL COOLING UNITS FOR THE MONTH………….86   DEPARTURE……….+47
TOTAL COOLING UNITS FOR THE SEASON………..565   DEPARTURE……….-11
TOTAL COOLING UNITS LAST SEASON TO DATE……694   DIFFERENCE……..-129

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………6  DEPARTURE……….+3
TOTAL HEATING UNITS FOR THE MONTH……………9  DEPARTURE………-16
TOTAL HEATING UNITS FOR THE SEASON………….11  DEPARTURE………-39
TOTAL HEATING UNITS LAST SEASON TO DATE……..36  DIFFERENCE……..-25

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………23 E   AT 10:24 A.M. *
ASOS…………………..24 E   AT 10:24 A.M.
DAVIS………………….22 ENE AT 10:18 A.M. RMY 24
FASTEST MILE FOR YESTERDAY………………..18 E  AT 10.23 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..18 E  AT 10:24 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….17 E  AT 10:23 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.8 E
ASOS…………………..9.7
DAVIS………………….8.9 ENE [060] * last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.17  DEPARTURE……….+0.04
ASOS…………..0.16
TOTAL PRECIPITATION FOR THE MONTH……….0.20  DEPARTURE……….-1.41
ASOS…………..0.18
TOTAL PRECIPITATION FOR THE YEAR……….31.38  DEPARTURE……….-5.25
ASOS………….31.61

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 72/51/62/-3/0.00/…/..              25 NNW RMY 22
9/13 67/50/59/-5/0.17…/..               23 E   RMY 24

9/14  morning low temp: 47F since midnight; normal low now 55F

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 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: Robert Skilling