Sunday, November 20, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, NOVEMBER 20, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

LIGHT RAIN GIVES WAY TO CLOUDY COLD AND WINDY CONDITIONS

Light rain showers before the 7 o’clock observation have given
way to overcast skies this morning. Unseasonably cold temperatures
with strong winds gusting to 40 mph and humidity near 100% have held
for both morning observations.  Temperatures actually fell into the
mid 30s from the mid 40s during the morning hours.

By the time of the 1 o’clock observation, temperatures had climbed
back into the lower 40s as conditions dried out.  Humidity levels
fell to around 62% as windy conditions continued.  The Barometric
pressure fell dramatically yesterday and has remained low but steady
today with the sea level pressure at 29.26 inches of mercury.

7 A.M.
Weather: Overcast Stratus, Few Cumulus Fractus W, Distant Haze
Temperature: 45F; Dew Point: 45F; Wind: SSE at 15 kts gusts to 26
Sea-level pressure: 29.26 ins. Hg, falling then more rapidly
Visibility: 20 miles, distant haze in all directions
6-hr Max temp: 45F
6-hr Min temp: 43F
24-hr precip: 0.06 in.
BHO SA 1155 E13 OVC 20 910/45/45/1515G26/926/ FEW CUFRA W DSNT HZ
ALQDS 8/7// MANUAL 70006 ASOS 70005 ASOS 60003 56038 10045 20043

10 A.M.
Weather: Overcast Stratus, Light Distant Haze
Temperature: 37F; Dew Point: 35F; Wind: WSW at 22 kts gusts to 31,
Sea-level pressure: 29.28 ins. Hg, falling, then rising and higher
Visibility: 50 miles, Light distant haze in all directions
BHO SA 1455 E20 OVC 50 917/37/35/2522G31/928 LGT DSNT HZ 8/6// 53007

1 P.M.
Weather: Overcast stratocumulus, breaks in overcast, light distant
haze all quadrants
Temperature: 52F; Dew Point: 44F; Wind: WSW at 15 kts gust to 28,
Sea-level pressure: 29.29 ins. Hg, falling then increasing
Peak Wind: 33 kts, WSW at 12:26 PM
Visibility: 60 miles, light distant haze in all directions
6-hr Max. temp: 45F
6-hr Min. temp: 37F
BHO SA 1755 E35 OVC 60 921/41/28/2515G28/929/ BINOVC LGT DSNT HZ ALQDS
PEAK WIND 25033/1726/ 8/5// 55004 10045 20037

SUMMARY FOR SATURDAY, NOVEMBER 19, 2016

TEMPERATURE (DEGREES F)
MAX…..53   NORMAL…..49
MIN…..39   NORMAL…..33
MEAN….46   NORMAL…..41

DEPARTURE FROM 30-YEAR NORMAL……………………+5
TOTAL DEPARTURE FOR THE MONTH…………………..+82 [+4.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..19   DEPARTURE……….-6
TOTAL HEATING UNITS FOR THE MONTH………….325   DEPARTURE………-82
TOTAL HEATING UNITS FOR THE SEASON…………746   DEPARTURE……..-224
TOTAL HEATING UNITS LAST SEASON TO DATE…….741   DIFFERENCE………+5

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….18 ENE AT 3:46 P.M.*
ASOS……………………18 NE  AT 9:16 A.M.
DAVIS…………………..17 N   AT 3:38 A.M. RMY 32
FASTEST MILE FOR YESTERDAY…………………13 NNE AT 3:38 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………15 E   AT 3:46 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..13 N   AT 3:40 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..7.0 NNW
ASOS…………………..7.5
DAVIS………………….6.4 NNE   [028 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.06  DEPARTURE……-0.10
ASOS…………..0.05
TOTAL PRECIPITATION FOR THE MONTH……….1.38  DEPARTURE……-1.61
ASOS…………..1.44
TOTAL PRECIPITATION FOR THE YEAR……….35.74  DEPARTURE…..-11.02
ASOS………….36.14

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 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
M:    Missing data

11/1  55/29/42/-4/0.00/600/97           22 SSE AERO 22 S   RMY N/A
11/2  69/45/57/+11/0.00/425/69          24 SSW AERO 24 S   RMY 26
11/3  65/49/57/+11/0.01/025/04          38 W   AERO 41 W   RMY 38
11/4  56/35/46/+1/0.00/587/96           26 NW  AERO 26 NW  RMY 30
11/5  55/32/44/-1/0.00/250/41           24 W   AERO 23 W   RMY 24
11/6  49/39/44/-1/0.04/091/15           23 N   AERO 23 N   RMY 23
11/7  46/33/40/-5/0.00/423/70           21 N   AERO 21 N   RMY 20
11/8  64/36/50/+6/0.00/590/98           17 W   AERO 15 SSW RMY N/A
11/9  60/43/52/+8/T/090/15              22 NNW AERO 22 NW  RMY N/A
11/10 52/34/43/-1/0.00/507/85           28 SSW AERO 30 SSW RMY 31
11/11 59/35/47/+4/0.00/565/95           39 NW  AERO 44 NW  RMY 45
11/12 47/31/39/-4/0.00/…/..           38 NW  AERO 44 NW  RMY 23
11/13 59/37/48/+5/0.00/…/..           23 W   AERO 22 W   RMY N/A
11/14 66/44/55/+13/0.00/…/..          24 WSW AERO 22 WSW RMY 25
11/15 57/46/52/+10/1.23/…/..          32 ENE AERO 33 ENE RMY 35
11/16 57/45/51/+9/0.04/…/..           26 W   AERO 25 W   RMY 28
11/17 55/41/48/+7/0.00/…/..           25 WNW AERO 29 NW  RMY 29
11/18 60/38/48/+8/0.00/…/..           21 NNE AERO 22 N   RMY 23
11/19 53/39/46/+5/…./…/..           18 ENE AERO 18 ENE RMY 32

11/20 Low temp since midnight is 40F; normal low is now 33F

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

RECORDS FOR NOVEMBER 20
HIGH 72 IN 1953
LOW 10 IN 1894
PRECIP 2.78 INS IN 1988
SNOWFALL 3.0 INS IN 1897
PEAK GUST 73e S IN 1950

RECORDS FOR NOVEMBER 21
HIGH 69 IN 1931
LOW 10 IN 1888
PRECIP 2.60 INCHES IN 1950
SNOWFALL 4.0 INS IN 1929
PEAK GUST 69 NW IN 1989

TODAY’S REPORT PREPARED BY: Robert Millette