Monday, September 7, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, SEPTEMBER 7, 2015 LABOR DAY
ALL TIMES ARE IN EASTERN STANDARD TIME

UNSEASONABLE HEAT RETURNS, LABOR DAY MARKS NEARLY
TWO WEEKS WITHOUT MEASURABLE PRECIPITATION

Yesterday’s maximum temperature of 87F, some 12 degrees
above the daily normal maximum temperature, continued a longer
term trend of above normal temperatures during the transition
from meteorological summer to autumn. A significant dry streak
has continued through this morning, with no measurable precipitation
recorded so far this month, and now two weeks since more than
a trace was measured on August 24th. Annual precipitation is
now 5.47 inches below normal with very little change in
the long term outlook. A small fire was reported in the Blue
Hill Reservation yesterday.

Heat was building throughout the morning today after an overnight
low of 63F. By the 1:00 PM EST observation temperatures had reached
91F, just one degree below today’s daily record maximum temperature
of 92F set back in 2007.

Today’s Observations:

7 A.M.
Weather: Clear, few cumulus distant SSE-SSW
Temperature: 67F; Dew Point: 57F; Wind: SW at 10 kts,
Sea-level pressure: 30.09 ins. Hg, falling, then rising and higher
Visibility: 35 miles, obscured by dark smoke layer distant in
all directions
6-hr Max temp: 67F
6-hr Min temp: 63F
24-hr precip: 0.00
BHO SA 1155 CLR 35 190/67/57/2310/009/ FEW CU DSNT SSE-SSW DRK K
LYR ALQDS/ 8/100 53003 10067 20063

10 A.M.
Weather: Sky clear
Temperature: 82F; Dew Point 62F; Wind: SSW at 8 kts,
Sea-level pressure: 30.08 ins. Hg, rising, then falling and lower
Visibility: 35 miles. light smoke layer in all directions, hazy
BHO SA 1455 CLR 35 185/82/62/2008/008/ SKC LGT K LYR ALQDS HAZY/
8/000 58005

1 P.M.
Weather: Clear, few cumulus and cirrus distant NW
Temperature: 91F; Dew Point: 63F; Wind: SW at 10G18 kts
Sea-level pressure: 30.03 ins. Hg, falling then more quickly
Visibility: 25 miles, light smoke layer in all directions, hazy
6-hr Max: 91F
6-hr Min: 67F
BHO SA 1755 CLR 25 168/91/63/2210G18/003/ FEW CU AND CI DSNT NW
LGT K LYR ALQDS HAZY/ 8/101 58017 10091 20067

SUMMARY FOR SUNDAY, SEPTEMBER 6, 2015

TEMPERATURE (DEGREES F)
MAX…..87   NORMAL…..75
MIN…..57   NORMAL…..58
MEAN….72   NORMAL…..67

DEPARTURE FROM 30-YEAR NORMAL……………………+5
TOTAL DEPARTURE FOR THE MONTH…………………..+25  [+4.0 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………7   DEPARTURE……….+4
TOTAL COOLING UNITS FOR THE MONTH…………..39   DEPARTURE………+18
TOTAL COOLING UNITS FOR THE SEASON…………705   DEPARTURE……..+147
TOTAL COOLING UNITS LAST SEASON TO DATE…….555   DIFFERENCE…….+150

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….21 SSW AT  6:25 P.M.*
ASOS……………………22   S AT  6:24 P.M.
DAVIS…………………..21 SSW AT  7:06 P.M. RMY 22
FASTEST MILE FOR YESTERDAY…………………17   S AT  6:19 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………17   S AT  6:19 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..17   S AT  6:19 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.7 WSW
ASOS…………………..9.8
DAVIS………………….8.9 WSW [240 DEG]

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………..0.00  DEPARTURE…..-0.71
ASOS……………0.00
TOTAL PRECIPITATION FOR THE YEAR………..30.26  DEPARTURE…..-5.47
ASOS…………….N/A ***
*** ASOS annual total not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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

9/1  81/65/73/+5/0.00/…/..               20 SSW RMY 20
9/2  89/64/77/+9/0.00/…/..               20 SW  RMY 21
9/3  85/66/76/+9/T/…/..                  17 E   RMY N/A TSTM
9/4  72/58/65/0/0.00/…/..                31 ENE RMY N/A
9/5  77/55/66/-1/0.00/…/..               14 SW  RMY 18
9/6  87/57/72/+5/0.00/…/..               21 SSW RMY 22

9/7  low since midnight is 63F; normal low is now 58F

DAILY RECORDS FOR SEPTEMBER 2015
None so far.

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

RECORDS FOR SEPTEMBER 7
HIGH 92F IN 2007
LOW 40F IN 1888
PRECIP 2.95 INCHES IN 1891
PEAK GUST 58e MPH W IN 1941

RECORDS FOR SEPTEMBER 8
HIGH 93F IN 2007
LOW 42F IN 1978
PRECIP 1.51 INCHES IN 2011
PEAK GUST 45 MPH S IN 2012

TODAY’S REPORT PREPARED BY: Brian Fitzgerald