Saturday, October 22, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, OCTOBER 22, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

INTENSE LOW PRESSURE BRINGS HEAVY RAINFALL
AND THUNDER FRIDAY EVENING THAT CONTINUES AS
PERIODS OF RAIN AND DRIZZLE TODAY…WINDS
INCREASE AND TEMPERATURES DROP THIS AFTERNOON…
NEARLY TWO INCHES MEASURED SINCE YESTERDAY…

Rainfall that began on Friday afternoon became
very heavy later in the evening during a period
of thunder and lightning. Nearly an inch and a
half of rain was measured in about 90 minutes
between 8:30 PM and 10:00 PM EST on Friday.
ASOS reports a 5-minute total of 0.24 inches
ending at 9:32 PM EST and an inch in about 45
minutes ending at 9:35 PM EST. The 24-hour total
ending at 7 AM this morning was 1.61 inches.
Drizzle continued with periods of moderate and
heavy rain this morning. An additional 0.22 inches
was measured in the six hours ending at 1 PM EST
giving a storm total of 1.83 inches. Winds were
generally light overnight as the temperature
remained in the 60s. A minimum sea-level pressure
of about 29.18 inches occurred shortly after
1 PM EST. Additional showers are moving through
the area this afternoon and wind speeds are
increasing as the storm lifts away to the north.
A peak wind gust of 33 mph from the WSW was
observed at 3:58 PM EST. With the increasing winds
the temperature has dropped into the middle 40s
as of mid-afternoon.
The monthly rainfall for October has now surpassed
5.70 inches, making this the wettest month of
the year to date.

7 A.M.
Weather: Dense fog, sun occasionally dimly visible
Temperature: 61F; Dew Point: 61F; Wind: WNW at 6 kts
Wind: Light
Sea-level pressure: 29.27 ins. Hg, falling, then more quickly
Visibility: 1/8 mile
6-hr Max temp: 64F
6-hr Min temp: 61F
24-hr precip: 1.61 in.
BHO SA 1155 W3 X 1/8F 913/61/61/3006/927/ SUN OCNLY
DMLY VSBL WND LGT/ 8//// 58010 60/// 70161 10064 20061

10 A.M.
Weather: Sky partly obscured in fog, light drizzle, fog
below summit all quadrants, stratus drifting below summit,
sun occasionally dimly visible
Temperature: 63F; Dew Point: 62F; Wind: WNW at 5 kts
Wind: Light
Sea-level pressure: 29.24 ins. Hg, falling, then more quickly
Visibility: 8 miles, except 6 miles SW, 15 miles E-SE
3-hour precip.: Trace
BHO SA 1455 -X E5 OVC 8L- 901/63/62/3005/924/ F1 FOG
BLO SMT ALQDS STRA DRFTG BLO SMT VSBY SW 6 E-SE 15
SUN OCNLY DMLY VSBL WND LGT/ 8/6// 58012 6000/

1 P.M.
Weather: Scattered stratus fractus, broken nimbostratus,
broken stratocumulus, overcast altocumulus, few lower
stratocumulus distant SW-WSW, stratus drifting below summit
all quadrants, few breaks in overcast S-SSW, sun occasionally
dimly visible, visibility increasing, pressure falling rapidly
Temperature: 53F; Dew Point: 53F; Wind: W at 16G23 kts
Sea-level pressure: 29.18 ins. Hg, falling rapidly
Visibility: 3 miles, variable 1 to 6 miles
6-hr Max. temp: 63F
6-hr Min. temp: 53F
6-hour precip.: 0.22 inches
BHO SA 1755 -X 4 SCT E15 BKN 55 BKN 100 OVC 3VR-F
881/53/53/2816G23/918/ F1 FEW SC DSNT SW-WSW STRA
DRFTG BLO SMT ALQDS FEW BINOVC S-SSW SUN DMLY VSBL
VSBY 1V6 VSBY INCR PRESFR/ 8/67/ 58020 6022/ 10063
20053

SUMMARY FOR FRIDAY, OCTOBER 21, 2016

TEMPERATURE (DEGREES F)
MAX…..75   NORMAL…..59
MIN…..57   NORMAL…..41
MEAN….66   NORMAL…..50

DEPARTURE FROM 30-YEAR NORMAL…………………..+16
TOTAL DEPARTURE FOR THE MONTH…………………..+98 [+4.5 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………1   DEPARTURE……….+1
TOTAL COOLING UNITS FOR THE MONTH……………7   DEPARTURE……….+2
TOTAL COOLING UNITS FOR THE SEASON…………901   DEPARTURE……..+299
TOTAL COOLING UNITS LAST SEASON TO DATE…….810   DIFFERENCE……..+91

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE………-15
TOTAL HEATING UNITS FOR THE MONTH………….154   DEPARTURE………-97
TOTAL HEATING UNITS FOR THE SEASON…………229   DEPARTURE……..-164
TOTAL HEATING UNITS LAST SEASON TO DATE…….302   DIFFERENCE……..-73

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….30 ESE AT 6:30 P.M.
ASOS……………………32 ESE AT 6:31 P.M.
DAVIS…………………..31 ESE AT 6:04 P.M. RMY 31
FASTEST MILE FOR YESTERDAY…………………23 ESE AT 6:30 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………21 ESE AT 6:36 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..21 SE AT 11:43 A.M.
AVERAGE WIND SPEED AND DIRECTION………….12.1 SSE
ASOS………………….11.5
DAVIS…………………10.6 SE [145 Deg.] *last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….1.61 DEPARTURE……+1.46
ASOS…………..1.63
TOTAL PRECIPITATION FOR THE MONTH……….5.50 DEPARTURE……+2.37
ASOS…………..5.54
TOTAL PRECIPITATION FOR THE YEAR……….32.82 DEPARTURE……-9.39
ASOS………….33.18

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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

10/1 57/52/55/-2/1.22/000/00                 33 NNE AERO M RMY 34
10/2 55/52/54/-3/0.19/000/00                 23 N   AERO M RMY N/A
10/3 69/53/61/+5/0.00/404/58                 21 ENE AERO M RMY 20
10/4 61/47/54/-2/T/493/71                    26 NE AERO M RMY 27
10/5 61/44/53/-3/0.00/630/91                 22 NE AERO M RMY 21
10/6 71/46/59/+4/0.00/682/99                 16 SW* AERO M RMY 15
10/7 75/54/65/+10/0.00/679/99                16 S   AERO M RMY 16
10/8 69/53/61/+7/0.00/130/19                 23 SSW AERO M RMY 23
10/9 63/44/54/0/1.89/000/00                  28 N   AERO M RMY 34
10/10 57/40/49/-5/0.00/658/97                 32 NW AERO M RMY 32
10/11 62/39/51/-2/0.00/655/97                 17 N   AERO M RMY N/A
10/12 68/49/59/+6/0.00/645/96                 17 S   AERO M RMY 17
10/13 71/52/62/+9/T/348/52                    24 SSW AERO M RMY 28
10/14 58/41/50/-2/0.00/667/100                26 NNW AERO M RMY 25
10/15 58/38/48/-4/0.00/578/87                 23 S   AERO M RMY 26
10/16 68/46/57/+6/0.00/562/85                 28 SSW AERO M RMY 30
10/17 76/58/67/+16/0.00/494/75                23 WSW AERO M RMY N/A
10/18 74/56/65/+14/0.54/210/32                35 SSW AERO M RMY 37
10/19 79/58/69/+19/0.00/549/84                29 SSW AERO M RMY N/A
10/20 64/54/59/+9/…./429/66                 23 ENE AERO M RMY 22
10/21 75/57/66/+16/…./142/22                30 ESE AERO M RMY 31