Wednesday, September 14, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, SEPTEMBER 14, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

WARM DAY WITH HIGHER DEW POINTS

Southwest winds continued to bring warm and  humid air into the region
yesterday evening and today.  Dew points rose to the low-60s, while
temperatures had risen to 86F, 14F above normal, by 1:00PM EST.  The higher
dew points made for some hazier conditions, and visibility was only 40 miles
during each observation.

Wind speeds began increasing in the afternoon ahead of an approaching cold
front.  A peak gust of 25 kts (29 MPH) was measured shortly after the 1:00PM
EST observation.

7 A.M.
Weather: Scattered cirrus
Temperature: 66F; Dew Point: 61F; Wind: SW at 10 kts
Sea-level pressure: 30.05 ins. Hg, falling slightly then steady
Visibility: 40 miles, distant fog
6-hr Max temp: 66F
6-hr Min temp: 61F
24-hr precip: 0.00 in.
BHO SA 1155 250 SCT 40 175/66/61/2210/005/ DSNT FG/ 8/001 58000 10066 20061

10 A.M.
Weather: Few cirrocumulus NE-SE, scattered cumulus
Temperature: 79F; Dew Point: 63F; Wind: SW at 8 kts
Sea-level pressure: 30.03 ins. Hg, steady then falling
Visibility: 40 miles
BHO SA 1455 250 SCT 40 170/79/63/2308/003/ FEW CC NE-SE/ 8/001 58005

1 P.M.
Weather: Scattered cumulus, few cirrostratus SW-ENE
Temperature: 85F; Dew Point: 60F; Wind: WSW at 10G18 kts
Sea-level pressure: 29.96 ins. Hg, falling, then less quickly
Visibility: 40 miles
6-hr Max. temp: 86F
6-hr Min. temp: 66F
BHO SA 1755 50 SCT 40 147/85/60/2410G18/996/ FEW CS SW-ENE/
8/108 56023 10086 20066

SUMMARY FOR TUESDAY, SEPTEMBER 13, 2016

TEMPERATURE (DEGREES F)
MAX…..81   NORMAL…..73
MIN…..57   NORMAL…..56
MEAN….69   NORMAL…..64

DEPARTURE FROM 30-YEAR NORMAL……………………+5
TOTAL DEPARTURE FOR THE MONTH…………………..+38 [+2.7 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………4   DEPARTURE……….+2
TOTAL COOLING UNITS FOR THE MONTH…………..55   DEPARTURE………+16
TOTAL COOLING UNITS FOR THE SEASON…………847   DEPARTURE……..+271
TOTAL COOLING UNITS LAST SEASON TO DATE…….758   DIFFERENCE……..+89

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE……….-3
TOTAL HEATING UNITS FOR THE MONTH……………0   DEPARTURE………-25
TOTAL HEATING UNITS FOR THE SEASON………….10   DEPARTURE………-40
TOTAL HEATING UNITS LAST SEASON TO DATE………3   DIFFERENCE………+7

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….25 SSW AT 12:01 P.M.
ASOS……………………26 SW  AT 12:00 P.M.
DAVIS…………………..25 SSW AT 12:00 P.M. RMY 26
FASTEST MILE FOR YESTERDAY…………………20 SSW AT 12:00 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………21 SW  AT 12:03 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..21 SSW AT 12:02 P.M.
AVERAGE WIND SPEED AND DIRECTION………….11.9 SW
ASOS………………….12.0
DAVIS…………………10.8 SSW [210 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M… 0.00  DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.31  DEPARTURE……-0.30
ASOS…………..1.30
TOTAL PRECIPITATION FOR THE YEAR……….26.28  DEPARTURE…..-10.35
ASOS………….26.57

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

9/1  72/64/68/0/0.09/000/00                  21 NNW AERO 16 NNW RMY 20
9/2  76/58/67/-1/0.00/738/94                 23 ENE AERO 17 NE  RMY 23
9/3  71/56/64/-3/0.00/368/47                 16 E   AERO 12 E   RMY N/A
9/4  71/58/65/-2/0.00/740/95                 28 NE  AERO 21 NE  RMY 27
9/5  73/57/65/-2/0.52/241/31                 42 NNE AER0 33 NNE RMY 43
9/6  70/61/66/-1/0.54/046/06                 32 N   AERO 23 NNE RMY N/A
9/7  78/66/72/+6/0.05/339/44                 21 NE* AERO 15 NE* RMY 21
9/8  79/65/72/+6/T/276/36                    22 S   AERO 15 S   RMY 23
9/9  90/69/80/+14/T/421/55                   23 W   AERO 24 W   RMY 25
9/10 82/71/77/+12/T/…/..                   25 S   AERO 18 S   RMY 32
9/11 79/59/69/+4/0.10/…/..                 39 WNW AERO 30 WNW RMY 43
9/12 76/53/65/0/0.00/…/..                  18 SW* AERO 13 WNW RMY 19
9/13 81/57/69/0.00/…/..                    25 SSW AERO  M     RMY 26

9/14 Low temp since midnight is 61F; normal low is now 55F

DAILY RECORDS FOR SEPTEMBER 2016

9/10/16: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F,
BREAKS PREVIOUS RECORD OF 69F SET IN 1915, 1931, AND 1989

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

RECORDS FOR SEPTEMBER 14
HIGH 90F IN 1931
LOW 34F IN 1911
PRECIP 4.38 INCHES IN 1944 (Great Atlantic Hurricane in 1944)
PEAK GUST 96e MPH E IN 1944 (Great Atlantic Hurricane in 1944)

RECORDS FOR SEPTEMBER 15
HIGH 89F IN 1931
LOW 35F IN 1913
PRECIP 3.93 INCHES IN 1904 (Extra-tropical storm making landfall in
New England on 9/15/1904 passing east of BHO and bringing a storm
total of 4.11 inches 9/14-15/1904)
PEAK GUST 65e MPH NW, WSW IN 1944 (In the wake of Great Atlantic Hurricane)

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle