Tuesday, September 25, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, SEPTEMBER 25, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

STEADY RAIN ARRIVING AS A WARM FRONT APPROACHES THE REGION….

High Pressure lingering offshore is contributing
to increased wind speed and ESE winds ushering in greater moisture
from the ocean. Combined with a low pressure system pressing in
to our north, we observe steady rain as the storm’s warm sector
enters the region. Rainfall began this morning around 8 A.M.,
amounting to 0.12 inches by 1 P.M. Winds have shifted from NE to SE
overnight with speeds at or exceeding 20 mph past noontime. The
high so far today is 59F, 9 degrees below the normal maximum of 68F.
The low since midnight is 51, the same as the daily normal.

Today’s Observations:

7 A.M.
Weather: Overcast altostratus, few cumulus NW-E
Temperature: 54F; Dew Point: 50F; Wind: ESE at 12G18 kts
Sea-level pressure: 30.52 ins. Hg, falling, then more rapidly
Visibility: 20 miles, distant fog in all directions
6-hr Max temp: 54F
6-hr Min temp: 51F
24-hr Precip: 0.00 ins.
BHO SA 1155 E140 OVC 20 335/54/50/1012G18/052/
FEW CU NW-E DSNT FG ALQDS/ 8/110 58005 10054 20051

10 A.M.
Weather: Overcast nimbostratus, few cumulus in all
directions, light rain becoming light drizzle
Temperature: 58F; Dew Point: 56F; Wind: E at 13G18 kts
Sea-level pressure: 30.48 ins. Hg, falling, then more rapidly
Visibility: 20 miles, distant fog in all directions
3-hr Precip: 0.01 ins.
BHO SA 1455 E140 OVC 20L- 322/58/56/0913G18/048/
DSNT FG ALQDS FEW CU ALQDS R-BCMG L-UNK/ 8/120 6001/ 58013

1 P.M.
Weather: Overcast nimbostratus, few stratus fractus in all
directions, moderate rain
Temperature: 59F; Dew Point: 58F; Wind: ESE at 16G26 kts,
Peak wind: 26 kts (30 mph) ESE at 12:47 P.M.
Sea-level pressure: 30.37 ins. Hg, falling, then more rapidly
Visibility: 10 miles, distant fog in all directions
6-hr Max temp: 59F
6-hr Min temp: 54F
6-hr Precip: 0.12 ins.
BHO SA 1755 E85 OVC 10R 286/59/58/1116G26/037/ DSNT FG ALQDS
FEW STFA ALQDS R CTD PK WND 1126/47/ 8/72/ 6012/ 58036 10059 20054

SUMMARY FOR MONDAY, SEPTEMBER 24, 2018

TEMPERATURE (DEGREES F)
MAX…..55 NORMAL…..69
MIN…..50 NORMAL…..52
MEAN….53 NORMAL…..60

DEPARTURE FROM 30-YEAR NORMAL…………………..-7
TOTAL DEPARTURE FOR THE MONTH………………….+63 [+2.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..12 DEPARTURE………+6
TOTAL HEATING UNITS FOR THE MONTH…………..56 DEPARTURE……..-18
TOTAL HEATING UNITS FOR THE SEASON………….56 DEPARTURE……..-43
TOTAL HEATING UNITS LAST SEASON TO DATE……..68 DIFFERENCE…….-12

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0 DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH………….102 DEPARTURE………+47
TOTAL COOLING UNITS FOR THE SEASON…………855 DEPARTURE……..+263
TOTAL COOLING UNITS LAST SEASON TO DATE…….676 DIFFERENCE…….+179

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY…………………37 ENE AT 6:21 A.M.
AERO……………………..35 ENE AT 6:20 A.M.
ASOS……………………..38 ENE AT 6:21 A.M.
DAVIS…………………….37 ENE AT 6:21 A.M. RMY 35
FASTEST MILE FOR YESTERDAY…………………..26 ENE AT 6:22 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………..25 ENE AT 6:22 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………….27 ENE AT 6:22 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..13.6 ENE
ASOS…………………..13.8
DAVIS………………….14.0 ENE [72 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE……-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….6.46 DEPARTURE……+3.29
ASOS…………..6.53
TOTAL PRECIPITATION FOR THE YEAR……….44.41 DEPARTURE……+6.40
ASOS………….46.05

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 75/58/67/-1/0.00/521/66 17 NE AERO 15 NE RMY 16
9/02 83/61/72/+4/0.00/684/87 20 SSW AERO 18 SSW RMY N/A
9/03 92/68/80/+13/0.00/650/83 24 WSW AERO 22 WSW RMY 25
9/04 88/70/79/+12/0.00/695/89 17 W AERO 16 W RMY 17
9/05 89/67/78/+11/0.00/638/82 23 SSW AERO 23 SSW RMY 25
9/06 92/70/81/+14/0.56/488/63 29 NNW AERO 29 NNW RMY N/A TSTM
9/07 70/63/67/+1/0.01/000/00 24 NE AERO 22 NE RMY N/A
9/08 68/54/61/-5/0.00/031/04 22 NE AERO 18 NE RMY 21
9/09 61/53/57/-9/0.00/000/00 23 NE AERO 21 NE RMY N/A
9/10 62/56/59/-6/…./…/.. 30 E AERO 28 E RMY 28
9/11 75/61/68/+3/…./…/.. 23 E AERO 21 E RMY N/A TSTM
9/12 69/63/66/+1/…./…/.. 21 ENE AERO 21 ENE RMY 21 TSTM
9/13 68/62/65/+1/…./…/.. 21 NE AERO 21 NE RMY N/A TSTM
9/14 75/61/68/+4/…./…/.. 13 NE AERO 12 ENE RMY 12
9/15 76/62/69/+5/0.01/…/.. 14 SW AERO 13 SW RMY 13
9/16 84/61/73/+10/…./…/.. 15 S AERO 14 S RMY N/A
9/17 82/64/73/+10/…./…/.. 22 SSW AERO 22 SSW RMY N/A
9/18 74/67/71/+9/…./…/.. 31 SSW AERO 30 SSW RMY N/A TSTM
9/19 66/57/62/0/…./…/.. 28 NE AERO 25 NE RMY 26
9/20 63/55/59/-3/…./…/.. 22 NE AERO 21 NE RMY 19
9/21 70/55/63/+2/…./…/.. 37 SSW AERO 37 SSW RMY 41
9/22 70/51/61/0/…./…/.. 37 SW AERO 36 SW RMY 30
9/23 60/47/54/-6/…./…/.. 14 N AERO 13 N RMY N/A
9/24 55/50/53/-7/…./…/.. 37 ENE AERO 35 ENE RMY 35