Saturday, January 14, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JANUARY 14, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

COLDER TEMPERATURES TODAY WITH PARTLY SUNNY SKIES…

After the record high temperatures on Thursday, the temperatures
on Friday dropped from a high of 55F at midnight at the start of
the day to a low of 23F at midnight at the end of the day. The
temperature continued to plunge to a low of 14F this morning.
Much drier air has moved in as well with the dew point falling to
near zero. The visibility was high all day near 70 miles.

Today’s Observations:

7 A.M.
Weather:Scattered cirrus, few stratocumulus distant offshore NE-SE
Temperature: 15F; Dew Point: -4F; Wind: NNW at 6 kts/
Wind: Light
Sea-level pressure: 30.68 ins. Hg steady then increasing
Visibility: 70 miles
6-hr Max temp: 22F
6-hr Min temp: 14F
24-hr precip: 0.00 in.
24-hr snowfall: 0.0 in.
BHO SA 1155 220 SCT 70 391/15/-4/3406/068/
FEW SC DSNT OFFSHR NE-SE WND LGT/ 8/501 53002 10022 20014

10 A.M.
Weather: Broken altocumulus, broken cirrus,few stratocumulus
distant offshore NE-ESE
Temperature: 20F; Dew Point: 7F; Wind: NW at 3 kts
Wind: Light
Sea-level pressure: 30.68 ins. Hg, falling, then more quickly
Visibility: 75 miles
BHO SA 1455 E150 BKN 220 BKN 75 388/20/7/3103/068/
FEW SC DSNT OFFSHR NE-ESE FEW LWR AC SW WND LGT/ 8/531 58003

1 P.M.
Weather: Scattered Cirrus,few stratocumulus,
distant offshore NE-ESE, Few altocumulus all quadrants
Temperature: 28F; Dew Point: 3F; Wind: SSW at 7 kts
Sea-level pressure: 30.54 ins. Hg, falling, then more slowly
Visibility: 70 miles
6-hr Max temp: 29F
6-hr Min temp: 15F
BHO SA 1755 220 SCT 70 343/28/3/2007/054/
FEW SC DSNT OFFSHR NE-ESE FEW AC ALQDS/ 8/531 56045 10029 20015

SUMMARY FOR FRIDAY, JANUARY 13, 2017

TEMPERATURE (DEGREES F)
MAX…..55   NORMAL…..34
MIN…..23   NORMAL…..17
MEAN….39   NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL…………………..+14
TOTAL DEPARTURE FOR THE MONTH…………………..+69 [+5.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..26   DEPARTURE………-14
TOTAL HEATING UNITS FOR THE MONTH………….440   DEPARTURE………-68
TOTAL HEATING UNITS FOR THE SEASON………..2472   DEPARTURE……..-340
TOTAL HEATING UNITS LAST SEASON TO DATE……2098   DIFFERENCE…….+374

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….39 WNW AT 12:32 P.M.
ASOS……………………43 WNW AT 12:32 P.M.
DAVIS…………………..40 NW  AT 12:32 P.M.  RMY 40
FASTEST MILE FOR YESTERDAY…………………32 WNW AT 12:33 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………30 WNW AT 12:34 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..30 NW  AT 12:33 P.M.
AVERAGE WIND SPEED AND DIRECTION………….16.7 WNW
ASOS………………….15.3
DAVIS…………………15.1 NW [318]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.60  DEPARTURE……+0.75
ASOS…………..2.85
TOTAL PRECIPITATION FOR THE YEAR………..2.60  DEPARTURE……+0.75
ASOS…………..2.85

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.5
TOTAL SNOWFALL FOR THE MONTH……………11.2  DEPARTURE…….+3.9
TOTAL SNOWFALL FOR THE SEASON…………..19.0  DEPARTURE…….-4.3

PRELIMINARY CLIMATE SUMMARY FOR JANUARY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system 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
M:    Missing data

1/1   41/29/35/+8/0.09/0.0/…/..           35 W   AERO 36 W   RMY 34
1/2   38/29/34/+7/0.00/0.0/…/..           21 E   AERO 20 E   RMY N/A
1/3   42/37/40/+14/1.14/0.0/000/00          39 ENE AERO 41 ENE RMY 34
1/4   44/30/37/+11/0.11/T/…/..            41 WNW AERO 46 WNW RMY 45
1/5   30/23/27/+1/0.00/0.0/…/..           37 W   AERO 39 W   RMY 38
1/6   30/20/25/-1/0.05/1.7/…/..           20 W   AERO 20 W   RMY N/A
1/7   22/14/18/-8/0.74/9.5/…/..           32 NNW AERO 39 NNW RMY 38
1/8   20/06/13/-13/0.01/T/…/..            26 NNW AERO 29 NNW RMY N/A
1/9   17/4/11/-15/0.00/0.0/…/..           23 SSW AERO 23 SSW RMY 25
1/10  41/14/28/+3/0.18/0.0/…/..           35 SE  AERO 37 SE  RMY N/A
1/11  53/40/47/+22/0.13/0.0/…/..          51 SSW AERO 48 SSW RMY 57
1/12  59/42/51/+26/0.15/0.0/…/..          37 SSW AERO 40 S   RMY 40
1/13  55/23/39/+14/0.00/0.0/…/..          39 WNW AERO 43 WNW RMY 42

1/14 Low temp since midnight is 14F; normal low is now 17F

DAILY RECORDS FOR JANUARY 2017

1/12/17: NEW DAILY RECORD HIGH MAXIMUM TEMP. OF 59F,
PREVIOUS RECORD WAS 57F SET 1913 AND TIED IN 1975
1/12/17: NEW DAILY RECORD HIGH MINIMUM TEMP. OF 42F,
PREVIOUS RECORD WAS 40F SET 2006

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

RECORDS FOR JANUARY 14
HIGH 65F IN 1995
LOW -12F IN 1914
PRECIP 1.45 INS. IN 2008
SNOWFALL 10.3 INS. IN 2008
PEAK GUST 68 MPH WNW IN 1976, S IN 2005

RECORDS FOR JANUARY 15
HIGH 64F IN 1995
LOW -16F IN 1957 [RECORD FOR MONTH] PRECIP 2.63 INS. IN 1958
SNOWFALL 8.8 INS. IN 1983
PEAK GUST 69e MPH SE IN 1940

TODAY’S REPORT PREPARED BY: Mike Iacono / Kaitlin Geagan