Friday, September 28, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, SEPTEMBER 28, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

RAINY AND FOGGY WITH WEATHER IMPROVING IN THE AFTERNOON….

Temperatures have reached 56F so far today, 12 degrees below
the daily normal of 67F. The low since midnight is 52F, 2 degrees
above the normal minimum temperature of 50F. Visibility decreased
from 20 miles at 7 A.M. to 2 miles at 10 A.M. due to a building
fog. We measured 0.23 inches of rain this morning, and 0.26 inches
at 1 P.M. Rainfall continued throughout the day, ending at or before
the 1 P.M. observation.

Today’s Observations:

7 A.M.
Weather: Broken stratus fractus, overcast nimbostratus
Temperature: 53F; Dew Point: 53F; Wind: NNE at 11G16 kts
Sea-level pressure: 30.11 ins. Hg, rising then falling
Visibility: 20 miles, except 10 miles NW-NE
6-hr Max temp: 57F
6-hr Min temp: 53F
24-hr Precip: 0.23 ins.
BHO SA 1155 E55 BKN 110 0VC 20L 195/53/53/0311G16/011/ VSBY NW-NE
10 MI R BCMG LUNK/ 8/72/ 70023 50006 10057 20053

10 A.M.
Weather: Overcast stratus, moderate rain
Temperature: 56F; Dew Point: 56F; Wind: NNE at 9G16 kts
Sea-level pressure: 30.09 ins. Hg, falling steadily
Visibility: 3 miles, fog
3-hr Precip: 0.11 ins.
BHO SA 1455 E25 OVC 3RF 189/56/56/0309G16/009/ R CTD/ 8/6// 6011/
57006

1 P.M.
Weather: Overcast stratus, light drizzle ending
Temperature: 66F; Dew Point: 50F; Wind: NNE at 9G17 kts
Sea-level pressure: 30.06 ins. Hg, falling steadily
Visibility: 8 miles, fog
6-hr Max temp: 56F
6-hr Min temp: 52F
6-hr Precip: 0.26 ins.
BHO SA 1755 E25 OVC 8L-F 181/55/54/0309G17/006/ L-EUNK/ 8/6// 6026/
56008 10056 20052

SUMMARY FOR THURSDAY, SEPTEMBER 27, 2018

TEMPERATURE (DEGREES F)
MAX…..66   NORMAL…..67
MIN…..56   NORMAL…..50
MEAN….61   NORMAL…..58

DEPARTURE FROM 30-YEAR NORMAL…………………..+2
TOTAL DEPARTURE FOR THE MONTH………………….+79 [+2.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………4   DEPARTURE………-3
TOTAL HEATING UNITS FOR THE MONTH…………..65   DEPARTURE……..-29
TOTAL HEATING UNITS FOR THE SEASON………….65   DEPARTURE……..-54
TOTAL HEATING UNITS LAST SEASON TO DATE……..68   DIFFERENCE……..-3

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0  DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH………….110  DEPARTURE………+52
TOTAL COOLING UNITS FOR THE SEASON…………863  DEPARTURE……..+268
TOTAL COOLING UNITS LAST SEASON TO DATE…….707  DIFFERENCE…….+156

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY…………………26 NNE AT  9:48 A.M.
AERO……………………..25 NNE AT  9:48 A.M.
ASOS……………………..27 NE  AT  9:49 A.M.
DAVIS…………………….29 NE  AT  9:48 A.M. RMY 28
FASTEST MILE FOR YESTERDAY…………………..17 NNE AT  9:52 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………..20 NE  AT  9:49 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………….19 NE  AT 10:56 A.M.
AVERAGE WIND SPEED AND DIRECTION……………9.9 ENE
ASOS…………………..10.4
DAVIS………………….10.4 NE [46 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.23  DEPARTURE……+0.08
ASOS…………..0.23
TOTAL PRECIPITATION FOR THE MONTH……….8.87  DEPARTURE……+5.25
ASOS…………..9.13
TOTAL PRECIPITATION FOR THE YEAR……….46.82  DEPARTURE……+8.36
ASOS………….48.65

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/…./000/00        30 E   AERO 28 E   RMY 28
9/11 75/61/68/+3/…./000/00        23 E   AERO 21 E   RMY N/A TSTM
9/12 69/63/66/+1/…./000/00        21 ENE AERO 21 ENE RMY 21  TSTM
9/13 68/62/65/+1/…./091/12        21 NE  AERO 21 NE  RMY N/A TSTM
9/14 75/61/68/+4/…./233/31        13 NE  AERO 12 ENE RMY 12
9/15 76/62/69/+5/0.01/218/29        14 SW  AERO 13 SW  RMY 13
9/16 84/61/73/+10/…./695/93       15 S   AERO 14 S   RMY N/A
9/17 82/64/73/+10/…./372/50       22 SSW AERO 22 SSW RMY N/A
9/18 74/67/71/+9/…./000/00        31 SSW AERO 30 SSW RMY N/A TSTM
9/19 66/57/62/0/…./007/01         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
9/25 68/51/60/0/…./…/..         36 SE  AERO 37 SE  RMY 38
9/26 79/66/73/+14/…./…/..       35 SSW AERO 37 SSW RMY 37
9/27 66/56/61/+2/…./…/..        26 NNE AERO 25 NNE RMY 28

9/28 Low temp since midnight is 52F; normal low is now 50F

DAILY RECORDS FOR SEPTEMBER

09/04/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F,
BREAKS PREVIOUS RECORD OF 68F SET IN 1937 AND 1959

09/06/18: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 92F,
TIES PREVIOUS RECORD OF 92F SET IN 1900

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

RECORDS FOR SEPTEMBER 28
HIGH 86F IN 2014
LOW 33F IN 1897,1947
PRECIP 2.46 INCHES IN 2004
PEAK GUST 69 MPH NE IN 1962

RECORDS FOR SEPTEMBER 29
HIGH 85F IN 1952
LOW 28F IN 1914 (SEPTEMBER MINIMUM RECORD)
PRECIP 2.61 INCHES IN 1907
PEAK GUST 62 MPH S IN 2005

TODAY’S REPORT PREPARED BY: Benjamin Turner