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Saturday, October 10, 2015

October 11, 2015

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, OCTOBER…

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, OCTOBER 10, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

COLD FRONT PASSES OVERNIGHT, BRINGING 45 MPH GUST
AND 0.27 INCHES OF NEW RAIN

Yesterday’s gusty conditions produced a peak wind
gust of 45 MPH at 12:37 PM EST from the South along
with a midnight to midnight average wind speed of
17.5 MPH. From 1:00 PM to 2:00 PM EST yesterday afternoon
wind’s averaged 28 MPH.

Rain showers began at approximately 3:00 PM EST in the
afternoon with occasional waves of moderate to heavy
rainfall totaling 0.27 inches. By midnight temperatures
dropped sharply from near 60F to an overnight low
of 44F.

Clear conditions this morning along with an intrusion
of drier, cooler air produced excellent visibility of
80 miles in all directions at the 7:00 AM EST observation.
By the 10:00 AM EST observation mostly clear skies were
still present with some cirrostratus slowly advancing toward
the station from the NW.

Today’s Observations:

7 A.M.
Weather: Clear, few cumulus NE-ESE, few cirrus distant
E-SW, few stratocumlus distant NW-N
Temperature: 45F; Dew Point: 40F; Wind: NW at 7 kts,
Sea-level pressure: 30.06 ins. Hg, rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 50F
6-hr Min temp: 44F
24-hr precip: 0.27 ins.
BHO SA 1155 CLR 80 178/45/40/3207/006/
FEW CU NE-ESE FEW CI DSNT E-SW FEW SC DSNT NW-N/
8/801 51028 ASOS 70028 MANUAL 70027 10050 20044

10 A.M.
Weather: Clear, few small cumulus in all directions,
few cirrostratus distant W-NNE, few cirrus distant E-SSW
Temperature: 53F; Dew Point 38F; Wind: N at 9G16 kts,
Sea-level pressure: 30.10 ins. Hg, rising, then more slowly
Visibility: 75 miles
BHO SA 1455 CLR 75 194/53/38/3609G16/010/
FEW SML CU ALQDS FEW CS DSNT W-NNE FEW CI DSNT E-SSW/ 8/105 51016

SUMMARY FOR FRIDAY, OCTOBER 9, 2015

TEMPERATURE (DEGREES F)
MAX…..68   NORMAL…..63
MIN…..50   NORMAL…..45
MEAN….59   NORMAL…..54

DEPARTURE FROM 30-YEAR NORMAL……………………+5
TOTAL DEPARTURE FOR THE MONTH…………………..-16  [-2.0 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH……………0   DEPARTURE……….-2
TOTAL COOLING UNITS FOR THE SEASON…………810   DEPARTURE……..+211
TOTAL COOLING UNITS LAST SEASON TO DATE…….587   DIFFERENCE…….+223

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………6   DEPARTURE……….-5
TOTAL HEATING UNITS FOR THE MONTH………….101   DEPARTURE………+12
TOTAL HEATING UNITS FOR THE SEASON…………144   DEPARTURE………-87
TOTAL HEATING UNITS LAST SEASON TO DATE…….182   DIFFERENCE……..-38

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….45  S   AT 12:37 P.M.
ASOS……………………47  S   AT 12:37 P.M.
DAVIS…………………..47  S   AT 12:36 P.M. RMY 49
FASTEST MILE FOR YESTERDAY……………….. 35  S   AT  1:21 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………33  S   AT  1:12 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..33  S   AT  1:12 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..17.5 s
ASOS…………………..16.8
DAVIS………………… 15.6 SSW [211 DEG]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.27  DEPARTURE…..+0.13
ASOS……………0.28
TOTAL PRECIPITATION FOR THE MONTH………..0.79  DEPARTURE…..-0.54
ASOS……………0.78
TOTAL PRECIPITATION FOR THE YEAR………..34.19  DEPARTURE…..-5.48
ASOS…………….N/A ***
*** ASOS annual total not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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

10/1 55/51/53/-4/…./…/..               39 NE  RMY N/A
10/2 51/47/49/-8/…./…/..               40 NE  RMY 43
10/3 51/45/48/-8/…./000/00               38 NE  RMY N/A
10/4 55/49/52/-4/0.00/…/..               35 E   RMY 40
10/5 59/46/53/-3/T/…/..                  21 NE  RMY 20
10/6 68/43/56/+1/0.00/…/..               17 NW  RMY 17
10/7 69/46/58/+3/0.00/…/..               20 W   RMY 20
10/8 63/49/56/+2/0.00/…/..               21 S   RMY N/A
10/9 68/50/59/+5/0.27/…/..               45 S   RMY 49

10/10 low since midnight is 44F; normal low is now 45F

DAILY RECORDS FOR OCTOBER 2015

-NONE SO FAR.

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR OCTOBER 10
HIGH 85F IN 1949
LOW 27F IN 1929
PRECIP 2.02 INCHES IN 1998
SNOWFALL 6.8 INCHES IN 1979 (RECORD FOR MONTH)
PEAK GUST 59 MPH WNW IN 1958

RECORDS FOR OCTOBER 11
HIGH 80F IN 1919,1949
LOW 28F IN 1993
PRECIP 0.96 INCHES IN 1903
SNOWFALL (NONE)
PEAK GUST 66e MPH WNW IN 1941

TODAY’S REPORT PREPARED BY: Brian Fitzgerald

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