Saturday, November 23, 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
SATURDAY, NOVEMBER 23, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME

DRIER AIR MOVED IN EARLY MORNING ON BLUSTERY WINDS –
A SIGN OF THINGS TO COME AS WE BRACE FOR LOW TEMPS AND HIGH WINDS SUNDAY

The air mass began drying out shortly after 2:00 A.M. and continued to do so
throughout the day, with dew points reaching into the teens. Stiff northwest
winds have been omnipresent today, averaging over 15 MPH through 2:00 P.M.
and mustering gusts of up to 37 MPH.

Clear morning skies gradually became littered with incoming cirrus and
cirrocumulus, and without direct sunlight temperatures began to fall from
their high of 44F.

After yesterday’s total of 0.22 inch of rain we are still 2.24 inches short
of our monthly average for November, and exactly 3.00 inches short of our
annual average.

In anticipation of the expected cold over the next few days, below are a
few current cold temperature records that could be challenged:

Nov 24
Record low maximum: 26F in 1936
Record low minimum: 7F in 1897

Nov 25
Record low maximum: 23F in 1938
Record low minimum: 13F in 1938

Today’s Observations:

7 A.M.
Weather: Clear with a few thin cirrus overhead, scattered stratocumulus
distant ENE-S and few cumulus fractus distant W-NNW
Temperature: 38F; Dew Point: 29F; Wind: NW at 13 kts.
Sea-level pressure: 29.86 ins. Hg, increasing then increasing more rapidly
Visibility: 70 miles
24-hr precip: 0.20 inch
6-hr max temp: 46F
6-hr min temp: 38F
BHO SA 1155 CLR 70 111/38/29/3013/986/ FEW THN CI INVCY SCT CU/SC DSNT ENE-S
FEW CU/CUFRA DSNT W-NNW/ 8/001 53016 70020 10046 20038

10 A.M.
Weather: Clear with few cirrus in all quadrants, scattered cumulus fractus
distant WSW-N
Temperature: 41F; Dew Point: 27F; Wind: NW at 14 kts.
Sea-level pressure: 29.90 ins. Hg, increasing then increasing more slowly
Visibility: 70 miles
BHO SA 1455 CLR 70 125/41/27/3014/990/ FEW CI ALQDS SCT CU/CURA DSNT WSW-N/
8/001 51014

1 P.M.
Weather: Scattered cirrus/cirrocumulus, cumulus fractus distant W-NNW
Temperature: 44F; Dew Point: 21F; Wind: WNW at 16G24 kts,
Wind: Peak Gust: 24 kts WNW @ 12:47 P.M.
Sea-level pressure: 29.84 ins. Hg, increasing then decreasing
Visibility: 70 miles
BHO SA 1755 200 SCT 70 105/44/21/2916G24/984/ CU/CUFRA DSNT W-NNW
PK WND 2924/47/ 8/002 58020 10044 20038

WEATHER SUMMARY FOR FRIDAY, NOVEMBER 22, 2013

TEMPERATURE (DEGREES F)
MAX…..46    NORMAL…..48
MIN…..38    NORMAL…..32
MEAN….42    NORMAL…..40

DEPARTURE FROM 30-YEAR NORMAL………………….+2
TOTAL DEPARTURE FOR THE MONTH………………….+10 [+0.5 DEGREE/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..23 DEPARTURE………-2
TOTAL HEATING UNITS FOR THE MONTH………….472 DEPARTURE………-10
TOTAL HEATING UNITS FOR THE SEASON…………949 DEPARTURE……..-96
TOTAL HEATING UNITS LAST SEASON TO DATE…….912 DIFFERENCE…….+37

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………17 WSW AT 2:20 A.M.
AERO…………………..18 SW AT 12:34 A.M.
ASOS…………………..19 SW AT 12:34 A.M.
DAVIS………………….19 SW AT 1:33 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………..14 SW AT 1:26 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..15 SW AT 1:36 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….14 SW AT 1:28 A.M.
AVERAGE WIND SPEED AND DIRECTION………….8.7 WSW
ASOS………………….9.2
DAVIS…………………8.1 SW [228 degrees]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.20   DEPARTURE…………+0.04
ASOS…………..0.20
TOTAL PRECIPITATION FOR THE MONTH……….1.23   DEPARTURE…………-2.24
ASOS…………..1.22
TOTAL PRECIPITATION FOR THE YEAR……….44.24   DEPARTURE…………-3.00
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………….-0.9
TOTAL SNOWFALL FOR THE SEASON…………0.2     DEPARTURE………….-1.2

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 46/38/42/+2/0.22/0.0/…/..         17 WSW AERO 18 MPH SW RMY N/A