Saturday, September 14, 2019

| September 15, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, SEPTEMBER 14, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDY AND BREEZY TODAY WITH INCREASING HUMIDITY…

A mostly middle level cloud deck dropped to lower stratocumulus
during the day as a cool front approached from the west. After
two days with low temperatures in the upper 40s, the dew point
began rising today to the middle 50s as of mid-day. The wind
has been increasing largely from the south, and the peak gust
has reached 31 kts, 36 mph, from the south exactly at 12:00 PM.

The high so far today is 68F, 4 degrees below the daily normal
of 72F.
The low since midnight is 49F, 6 degrees below the average
minimum of 55F.

FROM THE HISTORY BOOKS…
Today and tomorrow mark the 75th anniversary of the impacts of the
Great Atlantic Hurricane in New England on September 14-15, 1944.
At Blue Hill, a total of 3.67 inches of rain fell over those two
dates. A maximum 5-minute average wind speed of 77 mph was observed
from the northeast late on the 14th (with an estimated gust to 96 mph)
as the storm made landfall in southern New England as a Category 2
Hurricane. The center passed just east of Blue Hill and Boston as a
Category 1 Hurricane during the night. At its peak, this storm had
maximum sustained winds of 145 mph (Category 4) and a minimum central
pressure of 940 mb as it passed Cape Hatteras.

PRELIMINARY STATS FOR AUGUST 2019

TEMPERATURE, Deg. F
Avg. Max. 80.4 [+1.2]
Avg. Min. 62.1 [+0.3]
Mean      71.3 [+0.8]
24-hour corrected mean: 70.5
Max. for month: 92F on the 19th
Min. for month: 51F on the 26th

COOLING DEGREE DAYS
Total cooling units:   211 [+22]
Total for the season:  619 [+82]
Total for last season: 753

PRECIPITATION, Inches
Total: 1.83 [-2.21]
Greatest in 24 hrs: 0.81 ins. on the 28th-29th

WIND, mph
Avg. uncorrected wind speed: 9.1 mph
Avg. corrected wind speed:   9.8 mph
Prevailing wind direction: N/A
Peak gust and direction: N/A

SUNSHINE:
Campbell-Stokes card minutes: 16404 minutes of possible 24780 or 66%
Astronomical total minutes: 17074 minutes of possible 25768 or 66%

Today’s Observations:

7 A.M.
Weather: Broken altocumulus, overcast cirrus, breaks in
overcast E-SE, hazy
Temperature: 54F; Dew Point: 49F; Wind: SSE at 11 kts
Sea-level pressure: 30.39 ins. Hg, falling then more slowly
Visibility: 40 miles, visibility WSW-N 30, E-SE 50
6-hr Max temp: 54F
6-hr Min temp: 49F
24-hr Precip: 0.00 ins.
BHO SA 1155 E70 BKN 250 OVC 40 292/54/49/1611/039/
BINOVC E-SE VSBY WSW-N 30 E-SE 50 HAZY/ 8/071 56007
10054 20049

10 A.M.
Weather: Broken stratocumulus, broken altocumulus, overcast
cirrus, few lower stratocumulus all quadrants, few breaks
in overcast E-SE, hazy
Temperature: 65F; Dew Point: 56F; Wind: S at 15G24 kts,
Sea-level pressure: 30.34 ins. Hg, falling steadily
Visibility: 35 miles, visibility W-N 25, E-SE 45
3-hr Precip: 0.00 ins.
BHO SA 1455 E65 BKN 100 BKN 250 OVC 35 276/65/56/1715G24/034/
FEW LWR SC ALQDS FEW BINOVC E-SE VSBY W-N 25 E-SE 45 HAZY/
8/578 57016

1 P.M.
Weather: Scattered cumulus, broken stratocumulus, overcast
stratocumulus, rain showers SW-NE moving E
Temperature: 67F; Dew Point: 56F; Wind: S at 16G25 kts,
Wind: Peak gust 31 kts, south at 12:01 PM
Sea-level pressure: 30.28 ins. Hg, falling then more slowly
Visibility: 20 miles, visibility WNW-NNE 10, E-SE 40
6-hr Max temp: 68F
6-hr Min temp: 54F
6-hr Precip: 0.00 ins.
BHO SA 1755 35 SCT E40 BKN 55 OVC 20 253/67/56/1916G25/028/
VSBY WNW-NNE 10 E-SE 40 RW SW-NE MVNG E PK WND 1931/01/
8/5// 56023 10068 20054

SUMMARY FOR FRIDAY, SEPTEMBER 13, 2019

TEMPERATURE (DEGREES F)
MAX…..65   NORMAL…..73
MIN…..49   NORMAL…..56
MEAN….57   NORMAL…..64

DEPARTURE FROM 30-YEAR NORMAL………………….-7
TOTAL DEPARTURE FOR THE MONTH…………………-24 [-2.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON AUG TO JUL)
TOTAL HEATING UNITS FOR YESTERDAY……………8   DEPARTURE………+5
TOTAL HEATING UNITS FOR THE MONTH…………..28   DEPARTURE………+3
TOTAL HEATING UNITS FOR THE SEASON………….40   DEPARTURE……..-10
TOTAL HEATING UNITS LAST SEASON TO DATE……..22   DEPARTURE……..+18

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………-2
TOTAL COOLING UNITS FOR THE MONTH…………..20   DEPARTURE……..-19
TOTAL COOLING UNITS FOR THE SEASON…………639   DEPARTURE……..+63
TOTAL COOLING UNITS LAST SEASON TO DATE…….826   DEPARTURE…….-187

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..29 ENE AT  9:24 A.M.
AERO…………………….27 ENE AT  9:24 A.M.
ASOS…………………….29 E   AT  9:25 A.M.
DAVIS……………………29 E   AT  8:51 A.M. RMY 27
FASTEST MILE FOR YESTERDAY………………….19 ENE AT  9:52 A.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 E   AT  9:26 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………21 E   AT  9:25 A.M.
AVERAGE WIND SPEED AND DIRECTION……………11.5 ENE
ASOS……………………11.6
DAVIS…………………..11.8 ENE [78 deg.]
* Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.78  DEPARTURE……-0.83
ASOS…………..0.77
TOTAL PRECIPITATION FOR THE YEAR……….37.93  DEPARTURE……+1.29
ASOS………….37.93

PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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

8/01  84/66/75/+3/0.00/755/87               18 NNW AERO 20 NW  RMY 17
8/02  83/61/72/0/0.00/804/93                18 WSW AERO 18 WSW RMY 18
8/03  84/66/75/+3/0.00/302/35               25 SW  AERO 26 SW  RMY 25
8/04  83/66/75/+3/0.00/732/85               21 NE  AERO 23 SW  RMY 25
8/05  81/58/70/-2/0.00/842/98               20 S   AERO 18 S   RMY 19
8/06  79/63/71/-1/0.00/282/33               15 S   AERO 14 S   RMY 17
8/07  82/66/74/+2/0.34/367/43               32 SSW AERO 35 SSW RMY 35
8/08  84/67/76/+4/0.44/588/69               30 SW  AERO 24 WNW RMY 29
8/09  82/63/73/+1/0.00/815/96               28 NW  AERO 25 NW  RMY 26
8/10  78/59/69/-2/0.00/720/85               32 NW  AERO 28 NW  RMY 28
8/11  78/55/67/-4/0.00/734/87               28 W   AERO 25 W   RMY 28
8/12  82/60/71/0/0.00/749/89                25 W   AERO 23 W   RMY 26
8/13  77/66/72/+1/0.02/059/07               25 W   AERO 24 WSW RMY 24
8/14  75/62/69/-2/T/452/54                  24 ENE AERO 22 ENE RMY 22
8/15  77/59/68/-3/0.02/568/68               17 ESE AERO 15 SSE RMY 16
8/16  78/61/70/-1/0.00/740/89               20 E   AERO 17 ESE RMY 18
8/17  78/67/73/+2/0.01/099/12               14 SE  AERO 15 SE  RMY 15
8/18  88/70/79/+8/0.00/529/64               18 SSW AERO 18 SSW RMY 21
8/19  92/69/81/+11/0.03/536/65              25 WSW AERO 23 WSW RMY 25
8/20  87/66/77/+7/0.00/797/97               18 W   AERO 14 WSW RMY N/A
8/21  85/68/77/+7/0.12/287/35               33 SW  AERO 32 SW  RMY 33
8/22  88/68/78/+8/0.00/522/64               25 W   AERO 21 W   RMY 26
8/23  78/60/69/-1/0.04/016/02               23 N   AERO 18 N   RMY 24
8/24  72/55/64/-6/0.00/803/99               25 ENE AERO 21 ENE RMY 22
8/25  66/56/61/-8/0.00/590/73               31 ENE AERO 25 ENE RMY 29
8/26  71/51/61/-8/0.00/717/89               25 NE  AERO 21 NE  RMY 25
8/27  77/54/66/-3/0.00/530/66               18 SSW AERO 18 SSW RMY 17
8/28  78/59/69/0/0.66/184/23                21 SSE AERO 18 SSE RMY 20
8/29  83/63/73/+4/0.15/614/77               25 WNW AERO 21 WNW RMY 26
8/30  84/59/72/+4/0.00/739/93               30 SW  AERO 30 SW  RMY 28
8/31  79/61/70/+2/0.00/602/76               21 W   AERO 18 W   RMY 20

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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

9/01  73/56/65/-3/0.00/…/..                21 ENE AERO 14 ENE RMY 18
9/02  75/57/66/-2/0.37/…/..                39 W   AERO 41 W   RMY 41
9/03  77/61/69/+2/0.00/…/..                18 S   AERO 16 S   RMY N/A
9/04  83/61/72/+5/0.00/…/..                30 SW  AERO 28 SW  RMY 30
9/05  68/54/61/-6/0.00/…/..                23 NW  AERO 17 NW  RMY N/A
9/06  65/56/61/-6/…./…/..                37 ENE AERO 36 ENE RMY 36
9/07  70/51/61/-5/0.00/…/..                37 N   AERO 37 N   RMY N/A
9/08  73/53/63/-3/0.00/…/..                25 W   AERO 21 W   RMY N/A
9/09  71/54/63/-3/0.00/…/..                17 SE  AERO 16 SE  RMY 16
9/10  73/57/65/0/0.00/…/..                 25 S   AERO 25 S   RMY N/A
9/11  83/63/73/+8/0.00/…/..                31 SW  AERO 32 SW  RMY N/A
9/12  70/52/61/-4/0.11/…/..                29 ENE AERO 28 ENE RMY 28
9/13  65/49/57/-7/0.00/…/..                29 ENE AERO 27 ENE RMY 27

9/14 Low temp since midnight is 49F; normal low is 55F

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

RECORDS FOR SEPTEMBER 14
HIGH 90F IN 1931
LOW 34F IN 1911
PRECIP 4.38 INCHES IN 1944 (Great Atlantic Hurricane in 1944)
PEAK GUST 96e MPH E IN 1944 (Great Atlantic Hurricane in 1944)

RECORDS FOR SEPTEMBER 15
HIGH 89F IN 1931
LOW 35F IN 1913
PRECIP 3.93 INCHES IN 1904 (Extra-tropical storm making landfall in New England on 9/15/1904 passing east of BHO and bringing a storm total of 4.11 inches 9/14-15/1904)
PEAK GUST 65e MPH NW, WSW IN 1944 (In the wake of Great Atlantic Hurricane)

TODAY’S REPORT PREPARED BY: Mike Iacono / Matt Douglas

Category: Daily Discussions

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