Wednesday, September 26, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, SEPTEMBER 26, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

A WARM, BLUSTERY FALL DAY AFTER YESTERDAY’S RAIN….

Temperatures have reached 80F so far today, 12 degrees above
the daily normal of 68F. The low since midnight is 59F, 8 degrees
above the normal minimum temperature of 51F. Winds have remained
southerly and significant throughout the day. The highest gust so
far is 35 mph, occurring at 12:05 P.M. We measured 1.75 inches of
rain this morning, all of it falling yesterday afternoon.

Today’s Observations:

7 A.M.
Weather: Overcast stratus, few stratus fractus in all
directions
Temperature: 71F; Dew Point: 71F; Wind: S at 13G21 kts
Sea-level pressure: 30.04 ins. Hg, rising then falling
Visibility: 3 miles, fog
6-hr Max temp: 71F
6-hr Min temp: 68F
24-hr Precip: 1.75 ins.
BHO SA 1155 E20 OVC 3F 174/71/71/1813G21/004/ FEW STFA ALQDS/
8/6// 70175 50002 10071 20068

10 A.M.
Weather: Broken cumulus, broken altocumulus
Temperature: 76F; Dew Point: 71F; Wind: SSW at 16G24 kts
Sea-level pressure: 30.01 ins. Hg, falling, then more rapidly
Visibility: 45 miles
3-hr Precip: 0.01 ins.
BHO SA 1455 E25 BKN 100 BKN 45 164/76/71/2016G24/001/ 8/460 6001/
58010

1 P.M.
Weather: Overcast cumulus
Temperature: 80F; Dew Point: 71F; Wind: SSW at 17G28 kts,
Peak wind: 30 kts (35 mph) SSW at 12:05 P.M.
Sea-level pressure: 29.95 ins. Hg, falling, then more rapidly
Visibility: 30 miles
6-hr Max temp: 78F
6-hr Min temp: 70F
6-hr Precip: 0.01 ins.
BHO SA 1755 E25 OVC 30 141/80/71/2017G28/995/ 8/2// PK WND 2030/02/
6001/ 58023 10078 20070

SUMMARY FOR TUESDAY, SEPTEMBER 25, 2018

TEMPERATURE (DEGREES F)
MAX…..68   NORMAL…..68
MIN…..51   NORMAL…..51
MEAN….60   NORMAL…..60

DEPARTURE FROM 30-YEAR NORMAL……………………0
TOTAL DEPARTURE FOR THE MONTH………………….+63 [+2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………5   DEPARTURE………-1
TOTAL HEATING UNITS FOR THE MONTH…………..61   DEPARTURE……..-19
TOTAL HEATING UNITS FOR THE SEASON………….61   DEPARTURE……..-44
TOTAL HEATING UNITS LAST SEASON TO DATE……..68   DIFFERENCE……..-7

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0  DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH………….102  DEPARTURE………+46
TOTAL COOLING UNITS FOR THE SEASON…………855  DEPARTURE……..+262
TOTAL COOLING UNITS LAST SEASON TO DATE…….687  DIFFERENCE…….+168

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY…………………36 SE  AT 5:56 P.M.
AERO……………………..37 SE  AT 5:56 P.M.
ASOS……………………..37 SSE AT 5:56 P.M.
DAVIS…………………….42 SSE AT 5:58 P.M. RMY 38
FASTEST MILE FOR YESTERDAY…………………..25 SE  AT 5:56 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………..24 SSE AT 8:44 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………….28 SSE AT 5:56 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..16.9 ESE
ASOS…………………..16.1
DAVIS………………….16.7 SE [137 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….1.75  DEPARTURE……+1.47
ASOS…………..1.81
TOTAL PRECIPITATION FOR THE MONTH……….8.08  DEPARTURE……+4.76
ASOS…………..8.34
TOTAL PRECIPITATION FOR THE YEAR……….46.03  DEPARTURE……+7.87
ASOS………….47.86

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
9/25 68/51/60/0/…./…/..         36 SE  AERO 37 SE  RMY 38

9/26 Low temp since midnight is 58F; normal low is now 51F

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 26
HIGH 91F IN 2007
LOW 36F IN 1905,1922,1978
PRECIP 3.84 INCHES IN 1888
PEAK GUST 54e MPH S IN 1977

RECORDS FOR SEPTEMBER 27
HIGH 86F IN 2017
LOW 32F IN 1947
PRECIP 2.26 INCHES IN 1962
PEAK GUST 100 MPH SSE IN 1985 (HURRICANE GLORIA)

TODAY’S REPORT PREPARED BY: Benjamin Turner