Monday, November 30, 2020

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

MONDAY, NOVEMBER 30, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

QUIET START QUICKLY BECOMES STORMY THIS AFTERNOON….

We had an overcast but tranquil morning as we awaited the
arrival of a storm system. Rain began falling shortly
after 11 AM with just a moderate ESE to SE wind. By mid
afternoon the wind quickly ramped up with frequent gusts
to and over 50 MPH. Within the 4 PM hour winds were
really blowing hard up here on the summit with a peak
gust officially of 81 MPH from the SSE occuring at
4:38!

This gust represents the highest gust officially recorded
since 85 MPH on January 18, 2006. Today’s high wind event
also represents the 4th time this year we’ve had a peak
gust of 70 MPH or higher. The last time this happened
was back in 2002!

Should the 81 MPH gust hold (if we don’t see one higher
before midnight), this will be the 8th highest wind
gust recorded for the month of November dating back to
1940. Here is a list of current rankings…

BHO Highest November Wind Gusts, mph (1940-2020)

1) 96 mph, SSE on 3 Nov 1951
2) 94 mph, E on 25 Nov 1950
3) 90 mph, SSW on 28 Nov 1958
90 mph, SSW on 30 Nov 1963
5) 86 mph, SSE on 29 Nov 1963
6) 83 mph, S on 10 Nov 1942
83 mph, SW on 29 Nov 1960
8) 81 mph, SSE on 30 Nov 2020

Statistics above provided by our Chief Scientist, Mike Iacono.

The high so far today is 58F, 13 degrees above the daily
normal high of 45F. The low since midnight is 40F, 11
degrees above the normal low of 29F.

Today’s Observations:

7 A.M.
Weather: Overcast cirrostratus
Temperature: 43F; Dew Point: 40F; Relative Humidity: 89%
Wind: SE at 13 kts
Sea-level pressure: 30.07 in Hg; steady, then falling
Visibility: 40 miles, thin smoke layer, hazy
6-hr Max temp: 43F
6-hr Min temp: 40F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 E170 OVC 40 183/43/40/1313/007/ THN K LYR ALNG
HRZN ALQDS HAZY/ 8/007 58010 10043 20040

10 A.M.
Weather: Broken stratocumulus, broken altostratus, overcast altostratus/nimbostratus
Temperature: 49F; Dew Point: 45F; Relative Humidity: 85%
Wind: ESE at 14G20 kts
Sea-level pressure: 30.01 in Hg; falling, then more rapidly
Visibility: 25 miles, thin smoke layer, hazy
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 E45 BKN 70 BKN 130 OVC 25 163/49/45/1214G20/001/
VIRGA OVHD-N-NE THN K LYR ALNG HRZN ALQDS HAZY/ 8/52/ 58020

1 P.M.
Weather: Broken stratus fractus, broken stratocumulus,
overcast nimbostratus, light rain
Temperature: 54F; Dew Point: 53F; Relative Humidity: 96%
Wind: ESE at 19G26 kts, peak wind 37 MPH ESE at 11:57 A.M.
Sea-level pressure: 29.81 in Hg; falling rapidly
Visibility: 10 miles, thin fog
6-hr Max temp: 54F
6-hr Min temp: 43F
6-hr Precip: 0.06 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 E10 BKN 50 BKN 70 OVC 10R- 094/54/53/1219G26/981/
THN F ALQDS PCPN VRY LGT PRESFR PK WND 1232/1657/ 8/62/
58069 6006/ 10054 20043

SUMMARY FOR SUNDAY, NOVEMBER 29, 2020

TEMPERATURE (DEGREES F)
MAX…….52   NORMAL…..45
MIN…….33   NORMAL…..29
MEAN……43   NORMAL…..37

DEPARTURE FROM 30-YEAR NORMAL……………….  +6
TOTAL DEPARTURE FOR THE MONTH……………….+154 [+5.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………22  DEPARTURE…… -6
TOTAL HEATING UNITS FOR THE MONTH…………..507  DEPARTURE…..-163
TOTAL HEATING UNITS FOR THE SEASON………….959  DEPARTURE…..-274
TOTAL HEATING UNITS LAST SEASON TO DATE…….1201  DEPARTURE…..-242

PEAK WIND GUST FOR YESTERDAY (MPH):
420C/Official…………..21 SSW  AT   6:54 P.M.
AEROVANE (south tower)…..21 SSW  AT   6:54 P.M.
ASOS…………………..22 SSW  AT   6:56 P.M.
DAVIS #1……………….22 SW   AT   6:55 P.M.
DAVIS #2 (south tower)…..21 WSW  AT   1:56 P.M.
RMY……………………22
VECTOR…………………22
MERLIN…………………N/A

FASTEST MILE FOR YESTERDAY:
CONTACTING/OFFICIAL………………………..16 W    AT   2:17 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….15 S    AT  10:59 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 W    AT   2:16 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 WNW  AT  12:54 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……10.6 SSW  [255 total miles] ASOS…………………10.8      [259 total miles] DAVIS #1……………..10.8 WSW  [259 total miles] DAVIS #2……………..10.9 SW   [262 total miles] RMY………………….10.3 WSW  [247 total miles] VECTOR……………….10.7      [257 total miles]

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………….3.88  DEPARTURE….-0.72
ASOS………….3.97
TOTAL PRECIPITATION FOR THE YEAR………….45.05  DEPARTURE….-3.32
ASOS………..45.92

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0  DEPARTURE…..-0.2
TOTAL SNOWFALL FOR THE MONTH……………..Trace  DEPARTURE…..-2.3
TOTAL SNOWFALL FOR THE SEASON………………6.5  DEPARTURE…..+3.9

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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   49/36/43/-3/0.69/0.0/006/01      38 W     AERO 40 W    RMY 39
11/02   40/31/36/-10/T/T/425/69          61 WNW   AERO 62 WNW  RMY 62
11/03   43/29/36/-10/0.00/0.0/473/77     48 WNW   AERO 53 WNW  RMY 48
11/04   54/30/42/-3/0.00/0.0/550/90      30 SSW   AERO 30 SSW  RMY 30
11/05   69/49/59/+14/0.00/0.0/548/90     37 SSW   AERO 40 SSW  RMY 38
11/06   72/55/64/+19/0.00/0.0/394/65     28 SW    AERO 28 SW   RMY M
11/07   75/54/65/+20/0.00/0.0/562/93     21 WSW   AERO 21 WSW  RMY 21
11/08   73/54/64/+20/0.00/0.0/584/97     18 W     AERO 18 W    RMY 19
11/09   74/52/63/+19/0.00/0.0/593/99     20 WSW   AERO 18 WSW  RMY 21
11/10   74/53/64/+20/0.00/0.0/597/100    30 SW    AERO 28 SW   RMY 31
11/11   73/58/66/+23/0.04/0.0/…/..     40 SW    AERO 44 SW   RMY 45
11/12   64/46/55/+12/0.04/0.0/…/..     32 NNW   AERO 31 NNW  RMY 33
11/13   48/38/43/0/0.30/0.0/…/..       22 NW    AERO 21 NW   RMY 25
11/14   49/32/41/-1/0.00/0.0/…/..      26 NW    AERO 28 NW   RMY 29
11/15   58/30/44/+2/0.62/0.0/…/..      60 S     AERO 67 S    RMY 65
11/16   53/39/46/+4/0.00/0.0/…/..      40 WNW   AERO 41 WNW  RMY 43
11/17   47/32/40/-1/0.00/0.0/…/..      28 NW    AERO 28 NW   RMY 30
11/18   32/19/26/-15/0.00/0.0/…/..     40 NW    AERO 46 NW   RMY 43
11/19   44/18/31/-10/0.00/0.0/…/..     37 SW    AERO 39 SW   RMY 43
11/20   63/44/54/+14/0.00/0.0/…/..     33 SSW   AERO 35 SSW  RMY 37
11/21   62/40/51/+11/0.00/0.0/…/..     24 W     AERO 23 W    RMY 27
11/22   45/33/39/-1/T/0.0/…/..         28 SE    AERO 28 SE   RMY 31
11/23   58/32/45/+6/1.77/0.0/…/..      42 WNW   AERO 48 WNW  RMY 46 TSTM
11/24   42/27/35/-4/0.00/0.0/…/..      31 WNW   AERO 32 WNW  RMY 33
11/25   50/26/38/-1/…./0.0/…/..      23 SSE   AERO 23 SSE  RMY 26
11/26   58/45/52/+14/…./0.0/…/..     36 S     AERO 37 S    RMY 41
11/27   53/46/50/+12/…./0.0/…/..     23 WNW   AERO 23 WNW  RMY 23
11/28   52/36/44/+6/T/0.0/…/..         28 WNW   AERO 30 WNW  RMY 27
11/29   52/33/43/+6/0.00/0.0/…/..      21 SSW   AERO 21 SSW  RMY 22

11/30 The low since midnight is 40F, the daily normal low is 29F

DAILY RECORDS FOR NOVEMBER 2020

11/06/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 72F,
BREAKS PREVIOUS RECORD OF 71F SET IN 1959 AND 2015

11/07/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 75F,
TIES PREVIOUS RECORD OF 75F SET IN 1938

11/08/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 73F,
BREAKS PREVIOUS RECORD OF 72F SET IN 1938

11/09/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 74F,
BREAKS PREVIOUS RECORD OF 72F SET IN 1975

11/11/20: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 58F,
BREAKS PREVIOUS RECORD OF 56F IN 2002
DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 73F,
BREAKS PREVIOUS RECORD OF 68F IN 1984

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 5.7 INS. IN 2019
PEAK GUST 72 MPH NW IN 1964

TODAY’S REPORT PREPARED BY: Matt Douglas