Wednesday, November 21, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, NOVEMBER 21, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

FAIR WEATHER WITH A MODERATE SOUTHWESTERLY WIND….

Visibility was 40 miles this morning, increasing to 70
miles by the 1 P.M observation. The snowfall overnight
left .1 inches in the gauge at 7 A.M. We measured
.38 inches from the yesterday’s rainfall. Wind has
increased since this morning, with frequent gusts
at or above 20 mph. The maximum temperature reached
so far today is 37F, 11 degrees below the daily normal
of 48F. The low since midnight is 26F, 6 degrees below
the daily normal minimum of 32F.

Today’s Observations:

7 A.M.
Weather: Broken altostratus and cirrostratus, few cumulus
NE-SW
Temperature: 28F; Dew Point: 24F; Wind: WSW at 10G14 kts
Sea-level pressure: 30.01 ins. Hg, rising steadily
Visibility: 40 miles, thin smoke layer W-NE
6-hr Max temp: 31F
6-hr Min temp: 26F
24-hr Precip: 0.38 ins.
24-hr snowfall: 0.1 ins.
Snow depth: 0 ins.
BHO SA 1155 E100 BKN 250 BKN 40 164/28/24/2510G14/001/
FEW CU NE-SW THN K LYR W-NE/ 8/119 70038 51012 10031 20026

10 A.M.
Weather: Overcast altostratus, few cumulus in all directions
Temperature: 35F; Dew Point: 24F; Wind: SSW at 12G21 kts
Sea-level pressure: 29.99 ins. Hg, falling steadily
Visibility: 40 miles
3-hr Precip: 0.00 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 E100 OVC 40 157/35/24/2012G21/999/ FEW CU ALQDS/
8/11/ 58007

1 P.M.
Weather: Overcast altostratus, few cumulus in all directions
Temperature: 37F; Dew Point: 25F; Wind: SSW at 12G23 kts
Sea-level pressure: 29.91 ins. Hg, falling rapidly
Visibility: 70 miles
6-hr Max temp: 37F
6-hr Min temp: 28F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 E100 OVC 70 129/37/25/2012G23/991/ FEW CU ALQDS/
8/11/ 56036 10037 20028

SUMMARY FOR TUESDAY, NOVEMBER 20, 2018

TEMPERATURE (DEGREES F)
MAX…..38   NORMAL…..48
MIN…..33   NORMAL…..32
MEAN….36   NORMAL…..40

DEPARTURE FROM 30-YEAR NORMAL……………………-4
TOTAL DEPARTURE FOR THE MONTH…………………..-20 [-1.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..29   DEPARTURE………+4
TOTAL HEATING UNITS FOR THE MONTH………….452   DEPARTURE……..+20
TOTAL HEATING UNITS FOR THE SEASON…………996   DEPARTURE………+1
TOTAL HEATING UNITS LAST SEASON TO DATE…….686   DIFFERENCE……+280

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..30 NE  AT 12:42 P.M.
AERO…………………….30 NE  AT 11:24 A.M.
ASOS…………………….30 NE  AT 12:14 P.M.
DAVIS……………………30 NE  AT 11:26 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….23 NE  AT 12:08 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….21 NE  AT 12:15 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………21 NE  AT 12:09 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..10.3 NE
ASOS…………………..10.8
DAVIS………………….10.1 N [12 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.38  DEPARTURE…….+0.22
ASOS…………..0.41
TOTAL PRECIPITATION FOR THE MONTH……….7.87  DEPARTURE…….+4.73
ASOS…………..8.18
TOTAL PRECIPITATION FOR THE YEAR……….60.91  DEPARTURE……+14.18
ASOS………….63.04

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.1  DEPARTURE……..+0.1
TOTAL SNOWFALL FOR THE MONTH…………….7.6  DEPARTURE……..+6.7
TOTAL SNOWFALL FOR THE SEASON……………7.6  DEPARTURE……..+6.4

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

11/01 65/49/57/+11/…./006/01         25 SSW AERO 24 SSW RMY N/A
11/02 65/52/59/+13/…./000/00         37 SSW AERO 41 SSW RMY N/A
11/03 64/42/53/+7/…./144/24          59 W   AERO 60 W   RMY 58
11/04 52/37/45/0/…./570/96           31 W   AERO 30 W   RMY N/A
11/05 49/40/45/0/…./000/00           30 ENE AERO 29 ENE RMY 28
11/06 58/45/52/+7/…./000/00          29 SSW AERO 29 SSW RMY 31
11/07 60/50/55/+10/…./456/98         30 WSW AERO 30 WSW RMY 32
11/08 52/37/45/+1/…./234/78          29 WNW AERO 26 WNW RMY 23
11/09 48/34/41/-3/…./000/00          43 E   AERO 40 E   RMY 42
11/10 45/32/39/-5/…./576/100         45 W   AERO 47 WNW RMY 46
11/11 43/30/37/-6/0.00/462/80          32 WNW AERO 30 W   RMY 32
11/12 48/27/38/-5/0.00/000/00          18 SW  AERO 18 SW  RMY N/A
11/13 52/37/45/+2/…./458/80          44 WNW AERO 44 WNW RMY 48
11/14 37/20/29/-13/…./000/00         45 WNW AERO 50 WNW RMY 50
11/15 30/19/25/-17/…./…/..         33 E   AERO 36 E   RMY N/A
11/16 41/30/36/-6/…./…/..          43 E   AERO 44 ENE RMY N/A
11/17 45/34/40/-1/0.00/…/..          28 W   AERO 27 W   RMY 28
11/18 40/30/35/-6/0.00/…/..          21 W   AERO 21 W   RMY M
11/19 38/33/36/-5/…./…/..          16 E   AERO 14 E   RMY N/A
11/20 38/31/35/-5/…./…/..          30 NE  AERO 30 NE  RMY N/A

11/21 Low temp since midnight is 26F; normal low is 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: Benjamin Turner