Monday, November 21, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, NOVEMBER 21, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

FIRST OBSERVED SNOW OF THE SEASON FALLS THIS MORNING,
WIND ADVISORY REMAINS IN EFFECT THROUGH 10PM TONIGHT

Scattered stratus clouds brought us the first observed snow fall
during the 7:00AM observation this morning.  Warming temperatures
had melted the trace accumulation by 1:00PM.  Low pressure moved
northward, helping our station pressures to increase through the
early afternoon.

Cold conditions continue today.  Temperatures dropped to an overnight
low of 28F and had only rebounded to a max. of 36F by 1:00PM. A wind
advisory also continues for Southern New England through 10:00PM this
evening.  Winds were gusting up to 40 MPH out of the WSW-W.

7 A.M.
Weather: Light snow, few cumulus NE-SSE, scattered stratus,
broken cirrocumulus
Temperature: 29F; Dew Point: 24F; Wind: WSW at 13G20 kts,
Peak Wind: 27 kts (31 MPH) W at 5:56AM EST
Sea-level pressure: 29.42 ins. Hg, rising, then more quickly
Visibility: 30 miles, except 20 miles ENE-SSE and WSW-WNW
6-hr Max temp: 30F
6-hr Min temp: 28F
24-hr precip: Trace
BHO SA 1155 64 SCT E250 BKN 30S- 964/29/24/2413G20/942/ FEW CU NE-SSE
VSBY ENE-SSE AND WSW-WNW 20 PK WND 2727/56/ 8/609 51017 6000/ 10030 20028

10 A.M.
Weather: Broken stratocumulus, broken altocumulus
Temperature: 33F; Dew Point: 17F; Wind: W at 21G32 kts,
Peak Wind: 32 kts (37 MPH) W at 9:49AM EST
Sea-level pressure: 29.46 ins. Hg, rising, then less quickly
Visibility: 70 miles
3-hr precip: Trace
BHO SA 1455 E35 BKN 79 BKN 70 976/33/17/2621G32/946/ PK WND 2632/49/
8/530 51012 MANUAL 600//

1 P.M.
Weather: Scattered stratocumulus, broken altocumulus
Temperature: 35F; Dew Point: 17F; Wind: W at 22G32 kts,
Peak Wind: 35 kts (40 MPH) W at 12:11PM EST
Sea-level pressure: 29.47 ins. Hg, falling then rising
Visibility: 70 miles
6-hr Max. temp: 36F
6-hr Min. temp: 29F
6-hr precip: Trace
BHO SA 1755 44 SCT E84 BKN 70 978/35/17/2622G32/947/ PK WND 2735/11/
8/550 53002 MANUAL 600// 10036 20029

SUMMARY FOR SUNDAY, NOVEMBER 20, 2016

TEMPERATURE (DEGREES F)
MAX…..46   NORMAL…..49
MIN…..29   NORMAL…..32
MEAN….38   NORMAL…..40

DEPARTURE FROM 30-YEAR NORMAL……………………-2
TOTAL DEPARTURE FOR THE MONTH…………………..+80 [+3.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..27   DEPARTURE……….+2
TOTAL HEATING UNITS FOR THE MONTH………….352   DEPARTURE………-80
TOTAL HEATING UNITS FOR THE SEASON…………773   DEPARTURE……..-222
TOTAL HEATING UNITS LAST SEASON TO DATE…….756   DIFFERENCE……..+17

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….37 SW  AT  2:18 P.M.*
ASOS……………………40 WSW AT 11:15 A.M.
DAVIS…………………..39 S   AT  7:38 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………30 SW  AT  2:18 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………29 WSW AT  6:57 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..27 S   AT  7:39 A.M.
AVERAGE WIND SPEED AND DIRECTION………….18.1 WSW
ASOS………………….18.1
DAVIS…………………15.8 SW [230 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…TRACE  DEPARTURE……-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.38  DEPARTURE……-1.77
ASOS…………..1.44
TOTAL PRECIPITATION FOR THE YEAR……….35.74  DEPARTURE…..-11.18
ASOS………….36.14

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……..Trace  DEPARTURE…….-0.1
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE…….-0.9
TOTAL SNOWFALL FOR THE SEASON……………0.0  DEPARTURE…….-1.2

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 N/A
11/20 46/29/38/-2/…./…/..           37 SW* AERO 40 SW  RMY N/A

11/21 Low temp since midnight is 28F; normal low is now 32F

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

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

RECORDS FOR NOVEMBER 22
HIGH 70 IN 1931
LOW 12 IN 1987
PRECIP 1.78 INS IN 2005
SNOWFALL 9.0 INS IN 1971
PEAK GUST 70e SE IN 1945

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle