Thursday, November 28, 2013

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THANKSGIVING DAY, THURSDAY, NOVEMBER 28, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME

STORM TOTAL RAINFALL REACHES 2.36 INCHES;
~30 DEGREES COLDER TODAY AND MUCH DRIER WITH BRISK WINDS

Rain fell nearly continuously from Tuesday evening to late last night, and
it came down heavy at times during this period. The rainfall total reached
2.36 inches of rain. A new daily rainfall record of 2.23 inches was set
for November 27, surpassing the previous record of 1.92 inches set in
1898.

A very sharp cold front moved through the area yesterday afternoon, passing
the summit at approximately 3:45 P.M. EST. There was a very sharp change
in wind direction from SSW to WNW that occurred with the frontal passage,
and this shift in wind direction occurred over a period of only a couple
of minutes.

Cold air immediately came in behind the front, and temperatures dropped
steadily from near 60F just before the front came through to a low this
morning of 27F shortly after 7 A.M. EST. The air is also drying behind the
front, with dew point temperatures falling into the low teens this
afternoon.

Winds began picking up again late yesterday evening and brisk winds
continue today, with occasional gusts in the 35-45 mph range. This is
dropping wind chill values into the teens.

Today’s Observations:

7 A.M.
Weather: Scattered cumulus/stratocumulus, scattered altocumulus, cumulus/
stratocumulus distant all quadrants, altocumulus lenticularis distant E-S,
light distant haze
Temperature: 27F; Dew Point: 18F; Wind: W at 17G26 kts,
Wind: Peak wind 32 kts from W at 6:56 A.M. EST
Wind: Direction variable WSW-NW
Sea-level pressure: 29.87 ins. Hg, rising rapidly, rising then rising
more quickly
Visibility: 65 miles, light distant haze
24-hr precip: 1.52 inches
6-hr min temp: 27F
BHO SA 1155 35 SCT 80 SCT 65 114/27/18/2817G26/987/ CU/SC DSNT ALQDS ACSL
DSNT E-S LGT DSNT HZ PK WND 2832/1056 WND 25V31 PRESRR/ 8/540 53071
MANUAL 70152 ASOS 70155 10035 20027

10 A.M.
Weather: Scattered cumulus, cumulus distant all quadrants but mostly
WSW-N-E, light distant haze
Temperature: 30F; Dew Point: 17F; Wind: W at 20G35 kts,
Wind: Peak wind 35 kts from W at 9:46 A.M. EST
Wind: Direction variable WSW-NW
Sea-level pressure: 30.01 ins. Hg, rising then rising more slowly
Visibility: 70 miles, light distant haze
BHO SA 1455 35 SCT 70 163/30/17/2820G35/001/ CU DSNT ALQDS MSTLY WSW-N-E
LGT DSNT HZ PK WND 2835/46 WND 25V32/ 8/100 51049

1 P.M.
Weather: Clear, few cumulus distant all quadrants except ESE-SSE and SW-W
Temperature: 30F; Dew Point: 11F; Wind: WNW at 22G32 kts,
Wind: Peak wind 37 kts from WNW at 12:05 P.M. EST
Wind: Direction variable W-NW
Sea-level pressure: 30.08 ins. Hg, rising then rising more slowly
Visibility: 75 miles
6-hr max temp: 32F
BHO SA 1755 CLR 75 186/30/11/3022G32/008/ FEW CU DSNT ALQDS XCPT
ESE-SSE AND SW-W PK WND 2937/05 WND 26V32/ 8/100 51023 10032 20027

WEATHER SUMMARY FOR WEDNESDAY, NOVEMBER 27, 2013

TEMPERATURE (DEGREES F)
MAX…..61 NORMAL…..46
MIN…..34 NORMAL…..30
MEAN….48 NORMAL…..38

DEPARTURE FROM 30-YEAR NORMAL…………………+10
TOTAL DEPARTURE FOR THE MONTH…………………-16 [-0.8 DEGREE/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..17 DEPARTURE……..-10
TOTAL HEATING UNITS FOR THE MONTH………….630 DEPARTURE……..+15
TOTAL HEATING UNITS FOR THE SEASON………..1107 DEPARTURE……..-71
TOTAL HEATING UNITS LAST SEASON TO DATE……1052 DIFFERENCE…….+55

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………63 SSE AT 7:29 A.M.
AERO…………………..68 SSE AT 7:42 A.M.
ASOS…………………..63 SSE AT 7:30 A.M.
DAVIS………………….63 S AT 7:42 A.M. RMY 67
FASTEST MILE FOR YESTERDAY………………..49 SSE AT 7:46 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..44 S AT 9:43 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….44 SSE AT 7:32 A.M.
AVERAGE WIND SPEED AND DIRECTION…………22.8 WNW
ASOS…………………21.4
DAVIS………………..20.0 S [178 degrees]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M… 1.52 DEPARTURE…………+1.36
ASOS…………..1.55
TOTAL PRECIPITATION FOR THE MONTH……….3.59 DEPARTURE…………-0.68
ASOS…………..3.60
TOTAL PRECIPITATION FOR THE YEAR……….46.60 DEPARTURE…………-1.44
ASOS…………..N/A**
** ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…….0.0 DEPARTURE………….-0.1
TOTAL SNOWFALL FOR THE MONTH………….0.2 DEPARTURE………….-1.6
TOTAL SNOWFALL FOR THE SEASON…………0.2 DEPARTURE………….-1.9

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 2013 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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

11/1 68/56/62/+16/0.10/0.0/012/02 60 SSW AERO N/A N/A RMY 66
11/2 65/49/57/+11/0.00/0.0/296/48 22 WSW AERO N/A N/A RMY 23
11/3 49/30/40/-6/0.06/T/135/22 23 N AERO N/A N/A RMY N/A
11/4 42/27/35/-10/0.00/0.0/588/96 24 NNE AERO N/A N/A RMY 25
11/5 50/29/40/-5/0.00/0.0/487/80 16 SSW AERO N/A N/A RMY 17
11/6 59/40/50/+5/0.00/0.0/419/69 30 SSW AERO 31 MPH SSW RMY 33
11/7 65/37/51/+6/0.31/0.0/079/13 33 SW AERO 37 MPH SW RMY 37
11/8 48/31/40/-4/T/T/0.0/421/70 37 WNW AERO 37 MPH WNW RMY 39
11/9 44/29/37/-7/0.00/0.0/366/61 25 WNW AERO 25 MPH WNW RMY 29
11/10 52/40/46/+2/0.08/0.0/108/18 31 WNW AERO 33 MPH WNW RMY N/A
11/11 51/36/44/+1/0.00/0.0/500/84 36 WNW AERO 37 MPH WNW RMY 37
11/12 48/24/36/-7/0.11/0.2/000/00 42 SW AERO 43 MPH SW RMY 43
11/13 35/21/28/-15/0.00/0.0/591/100 29 NW AERO 30 MPH NW RMY 30
11/14 49/26/38/-4/0.00/0.0/536/91 25 SW AERO 25 MPH SW RMY 28
11/15 59/38/49/+7/0.00/0.0/393/67 24 S AERO 25 MPH S RMY 26
11/16 59/40/50/+8/0.00/0.0/363/62 20 WSW AERO 20 MPH WSW RMY N/A
11/17 59/42/51/+10/0.07/0.0/000/00 23 SSE AERO 25 MPH SSE RMY N/A
11/18 65/46/56/+15/0.28/0.0/400/69 40 SSW AERO 40 MPH S RMY N/A
11/19 46/28/37/-4/0.00/0.0/428/74 46 WNW AERO 46 MPH WNW RMY 46
11/20 40/25/33/-7/0.00/0.0/…/.. 23 NW AERO 22 MPH NW RMY 22
11/21 46/26/36/-4/0.00/0.0/…/.. 16 SW AERO 16 MPH SW RMY N/A
11/22 46/39/43/+3/0.22/0.0/…/.. 17 WSW AERO 18 MPH SW RMY 19
11/23 46/27/37/-2/0.00/0.0/…/.. 40 WNW AERO 44 MPH WNW RMY 48
11/24 27/17/22/-17/0.00/0.0/…/.. 53 NW AERO 59 MPH NW RMY 57
11/25 32/14/23/-16/0.00/0.0/…/.. 29 W AERO 29 MPH WNW RMY N/A
11/26 42/29/36/-2/…./T/000/00 25 SW AERO 27 MPH SW RMY 28
11/27 61/34/48/+10/…./0.0/000/00 63 SSE AERO 68 MPH SSE RMY 67