Friday, November 30, 2018

| November 30, 2018 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, NOVEMBER 30, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

PIVOTAL DAY EXHIBITS CRESTING HIGH PRESSURE…

As the headline indicates, today’s weather is highlighted
by the shift to falling pressure readings and a return to
cloudy skies ahead of the weekend.  This comes in contrast
to the past 36 hours, where clear skies and northwest winds
enabled significant temperature drops, reflected in our minimum
of 27 F this morning.  Today appears to be on course for colder than
average temperatures, but looking ahead, today’s notable reduction in
wind speed coupled with a shift to southwesterly airflow
should enable some warm air advection from here on out. Yesterday,
observed winds were fairly sustained north-westerlies, with significant
gusts coming in over 40 MPH.  Morning visibility was limited by distant
clouds lingering in the west, eventually moving into proximity for the
afternoon hours, where a near overcast ceiling was observed
for the 1 PM observation.

BHO Wettest Novembers, inches (1886-2018):

1) 10.32 in 2018 (through 7 AM on 11/30)
2) 9.78 in 1983
3) 9.29 in 1945
4) 9.17 in 1972
5) 8.95 in 1895
6) 8.93 in 1988
7) 8.79 in 1963

BHO Wettest Falls (Sep-Nov), inches (1886-2018):

1) 25.42 in 2018 (through 7 AM on 11/30)
2) 23.18 in 2005
3) 23.13 in 1996
4) 22.47 in 1888
5) 20.65 in 2011
6) 20.64 in 1932
7) 20.08 in 1962
Today’s Observations:

7 A.M.
Weather: Few Cirrus, few distant stratocumulus in all directions
Temperature: 28F; Dew Point: 24F; Wind: NW at 6 kts,
Sea-level pressure: 30.02 ins. Hg, rising steadily
Visibility: 35 miles
6-hr Max temp: 30F
6-hr Min temp: 27F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 35 CLR 167/28/24/3206/002/
FEW CI ALQDS FEW DSNT SC ALQDS/ 8/402 52016 10030 20027

10 A.M.
Weather: Few cirrus, few distant stratocumulus in all directions,
few distant altocumulus NW-S
Temperature: 36F; Dew Point: 28F; Wind: NW at 3 kts,
Sea-level pressure: 30.04 ins. Hg, rising slowly
Visibility: 45 miles
3-hr Precip: 0.00 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 45 CLR 175/36/28/3103/004/
FEW CI ALQDS FEW DSNT SC ALQDS FEW DSNT AC NW-S/ 8/492 51008

1 P.M.
Weather: Broken altocumulus, few cumulus in all directions
Temperature: 38F; Dew Point: 27F; Wind: WSW at 4 kts,
Sea-level pressure: 30.01 ins. Hg, falling steadily
Visibility: 55 miles
6-hr Max temp: 39F
6-hr Min temp: 27F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 55 BKN 110 162/38/27/2404/001/
FEW CU ALQDS 8/89/ 56013 10039 20027

SUMMARY FOR THURSDAY, NOVEMBER 29, 2018

TEMPERATURE (DEGREES F)
MAX…..43   NORMAL…..45
MIN…..30   NORMAL…..29
MEAN….37   NORMAL…..37

DEPARTURE FROM 30-YEAR NORMAL…………………….0
TOTAL DEPARTURE FOR THE MONTH…………………..-75 [-2.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..28   DEPARTURE……….0
TOTAL HEATING UNITS FOR THE MONTH………….744   DEPARTURE……..+74
TOTAL HEATING UNITS FOR THE SEASON………..1288   DEPARTURE……..+55
TOTAL HEATING UNITS LAST SEASON TO DATE…….939   DIFFERENCE……+349

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..40 NW  AT 12:10 P.M.
AERO…………………….41 NW  AT  1:56 P.M.
ASOS…………………….40 WNW AT 12:12 P.M.
DAVIS……………………42 WNW AT 12:10 P.M. RMY 44
FASTEST MILE FOR YESTERDAY………………….30 NW  AT  3:20 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….28 NW  AT  3:21 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………29 NW  AT  3:22 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..17.4 NW
ASOS…………………..16.1
DAVIS………………….17.2 NW [318 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH………10.32  DEPARTURE…….+5.73
ASOS………….10.76
TOTAL PRECIPITATION FOR THE YEAR……….63.37  DEPARTURE……+15.19
ASOS………….65.63

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.1
TOTAL SNOWFALL FOR THE MONTH…………….7.6  DEPARTURE……..+5.5
TOTAL SNOWFALL FOR THE SEASON……………7.6  DEPARTURE……..+5.2

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

11/01 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 39/20/30/-10/…./…/..         40 WNW AERO 46 WNW RMY 47
11/22 20/09/15/-25/…./…/..         36 NW  AERO 41 NW  RMY 42
11/23 30/09/20/-19/0.00/…/..         25 SW  AERO 25 SW  RMY 27
11/24 43/24/34/-5/…./…/..          27 SW  AERO 27 ESE RMY N/A
11/25 43/40/42/+3/…./…/..          39 ENE AERO 39 ENE RMY 39
11/26 44/39/42/+4/…./…/..          45 E   AERO 44 E   RMY 45
11/27 45/33/39/+1/…./…/..          44 ENE AERO 44 ENE RMY N/A
11/28 39/31/35/-3/…./…/..          37 WNW AERO 41 WNW RMY 42
11/29 43/30/37/0/…./…/..           40 NW  AERO 41 NW  RMY 44

11/30 Low temp since midnight is 27F; normal low is 29F

DAILY RECORDS FOR NOVEMBER 2017

11/22/18: DAILY RECORD LOW MAXIMUM TEMPERATURE OF 20F,
BREAKS PREVIOUS RECORD OF 26F SET IN 1972 AND 2008
11/22/18: DAILY RECORD LOW MINIMUM TEMPERATURE OF 9F,
BREAKS PREVIOUS RECORD OF 12F SET IN 1987
11/23/18: DAILY RECORD LOW MINIMUM TEMPERATURE OF 9F,
TIES PREVIOUS RECORD OF 9F SET IN 1888

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

RECORDS FOR NOVEMBER 30
HIGH 67 IN 2006
LOW 7 IN 1887, 1929
PRECIP 2.42 INCHES IN 1944
SNOWFALL 10.2 INS IN 1945
PEAK GUST 90 SSW IN 1963

RECORDS FOR DECEMBER 1
HIGH 70 IN 2001
LOW 3 IN 1887
PRECIP 1.46 INS. IN 1917
SNOW 2.0 INS. IN 1902
PEAK GUST 72 MPH NW IN 1964

TODAY’S REPORT PREPARED BY: Nate Iannuccillo

 

Category: Daily Discussions

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