Monday, January 16, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JANUARY 16, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

SEASONABLE DAY WITH S-SW WINDS AND DRY CONDITIONS

High pressure over the region is bringing us mostly sunny skies
and dry, seasonable conditions.  Thin fog was trapped under a
temperature inversion at the 7:00AM ob this morning.  Visibility
decreased slightly at the 10:00AM ob due to distant haze but
increased back to 70 miles by early afternoon.  Winds shifted
out of the SW around 7:00AM this morning and have remained from
that direction all day.

Today’s Observations:

7 A.M.
Weather: Few distant cumulus ESE, thin fog below temperature inversion
Temperature: 25F; Dew Point: 12F; Wind: S at 6 kts,
Wind Speed: Light
Sea-level pressure: 30.42 ins. Hg, steady then increasing
Visibility: 70 miles
6-hr Max temp: 25F
6-hr Min temp: 22F
24-hr precip: 0.00 in.
24-hr snowfall: 0.0 in.
BHO SA 1155 CLR 70 303/25/12/1906/042/ FEW CU DSNT ESE
THN FG BLO INVSN WND LGT/ 8/100 53002 10025 20022

10 A.M.
Weather: Few distant cirrus SSE-W
Temperature: 31F; Dew Point: 17F; Wind: SSW at 8 kts
Sea-level pressure: 30.43 ins. Hg, falling then rising
Visibility: 60 miles, distant haze in all directions
BHO SA 1455 CLR 60 304/31/17/2008/043/ FEW CI DSNT SSE-W
DSNT HZ ALQDS/ 8/001 53001

1 P.M.
Weather: Scattered cirrus
Temperature: 38F; Dew Point: 19F; Wind: SW at 13G20 kts
Sea-level pressure: 30.32 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 39F
6-hr Min temp: 25F
BHO SA 1755 250 SCT 70 269/38/19/2313G20/032/ 8/001 58035 10039 20025

SUMMARY FOR SUNDAY, JANUARY 15, 2017

TEMPERATURE (DEGREES F)
MAX…..35   NORMAL…..33
MIN…..23   NORMAL…..17
MEAN….29   NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL……………………+4
TOTAL DEPARTURE FOR THE MONTH…………………..+70 [+4.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..36   DEPARTURE……….-4
TOTAL HEATING UNITS FOR THE MONTH………….519   DEPARTURE………-68
TOTAL HEATING UNITS FOR THE SEASON………..2551   DEPARTURE……..-341
TOTAL HEATING UNITS LAST SEASON TO DATE……2173   DIFFERENCE…….+378

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….28  NW AT 10:01 A.M.
ASOS……………………28 NNW AT 10:02 A.M.
DAVIS…………………..26   N AT 11:58 A.M.  RMY 28
FASTEST MILE FOR YESTERDAY…………………18  NW AT 10:01 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………10  NW AT 10:24 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..19  NW AT 10:24 A.M.
AVERAGE WIND SPEED AND DIRECTION………….10.1 NW
ASOS………………….10.2
DAVIS………………….9.2 NNW [335 deg.]

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……+0.46
ASOS…………..2.85
TOTAL PRECIPITATION FOR THE YEAR………..2.60  DEPARTURE……+0.46
ASOS…………..2.85

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.6
TOTAL SNOWFALL FOR THE MONTH……………11.2  DEPARTURE…….+2.7
TOTAL SNOWFALL FOR THE SEASON…………..19.0  DEPARTURE…….-5.5

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/+8/0.09/0.0/533/97           35 W   AERO 36 W   RMY 34
1/2   38/29/34/+7/0.00/0.0/011/02           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/000/00            41 WNW AERO 46 WNW RMY 45
1/5   30/23/27/+1/0.00/0.0/343/62           37 W   AERO 39 W   RMY 38
1/6   30/20/25/-1/0.05/1.7/072/13           20 W   AERO 20 W   RMY N/A
1/7   22/14/18/-8/0.74/9.5/000/00           32 NNW AERO 39 NNW RMY 38
1/8   20/06/13/-13/0.01/T/512/92            26 NNW AERO 29 NNW RMY N/A
1/9   17/4/11/-15/0.00/0.0/335/60           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  30/14/22/-3/0.00/0.0/…/..           20 SSW AERO 20 SSW RMY 22
1/15  35/23/29/+4/0.00/0.0/…/..           28 NW  AERO 28 NW  RMY 28

1/16 Low temp since midnight is 22F; 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 16
HIGH 63F IN 1995
LOW -12F IN 2004
PRECIP 1.32 INS. IN 1936
SNOWFALL 14.0 INS. IN 1965
PEAK GUST 79 MPH WNW IN 1960

RECORDS FOR JANUARY 17
HIGH 55F IN 1973,1995
LOW -8F IN 1907,1982
PRECIP 1.43 INS. IN 1956
SNOWFALL 13.4 INS. IN 1956
PEAK GUST 62 MPH S IN 1994

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle and Kaitlin Geagan