Sunday, September 13, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, SEPTEMBER 13, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

MEASURABLE RAINFALL TOTALS 0.04 FOR THE DAY AS LOTS OF MOISTURE
BRING LIGHT DRIZZLE AND HEAVY FOG FOR THE DAY

BLUE HILL OBSERVATORY ASKS FOR YOUR SUPPORT
FOR OUR KICKSTARTER FUNDRAISER FOR A NEW
AEROVANE ANEMOMETER- PLEASE SUPPORT BY VISITING:

Fog and Drizzle have been present all day here at the top of the hill and rain
continues to fall with an additional .01 inches since the 7 AM observation.
The fog is beginning to lift just before the 1 PM observation but visibility
will remain low.

Today’s Observations:

7 A.M.
Weather: Obscurement dense fog and light drizzle
Temperature: 60F; Dew Point: 60F; Wind: E at 8 kts,
Sea-level pressure: 29.77 ins. Hg, falling, then rising and higher
Visibility: 1/8 of a mile, dense fog and drizzle
6-hr Max temp: 61F
6-hr Min temp: 60F
24-hr precip: 0.04 in.
BHO SA 1155 W3 X 1/8L-F 081/60/60/0908/977/ 8//// 53010
ASOS 70003 MANUAL 70004 10061 20060

10 A.M.
Weather: Obscurement dense fog and light drizzle
Temperature: 62F; Dew Point 62F; Wind: E at 5 kts, estimated,
Wind: Light
Sea-level pressure: 29.79 ins. Hg, rising, then falling slightly
Visibility: 1/16 miles, dense fog and drizzle
BHO SA 1455 W2 X 1/16L-F 088/62/62/E0905/979/ WND LGT/
8//// 53007 MANUAL 60001

1 P.M.
Weather: Obscurement dense fog and light drizzle
Temperature: 65F; Dew Point: 65F; Wind: ESE at 7 kts
Sea-level pressure: 29.77 ins. Hg, falling, then steady
Visibility: 6 mi, dense fog
6-hr Max: 65F
6-hr Min: 60F
6-hr precip: 0.02 inch
BHO SA 1755 W4 X 6L-F 081/65/65/1107/977/ 8//// 56007 MANUAL 60002
10065 20060

SUMMARY FOR SATURDAY, SEPTEMBER 12, 2015

TEMPERATURE (DEGREES F)
MAX…..75   NORMAL…..73
MIN…..58   NORMAL…..56
MEAN….67   NORMAL…..64

DEPARTURE FROM 30-YEAR NORMAL…………………….+3
TOTAL DEPARTURE FOR THE MONTH…………………..+76  [+6.5 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………2   DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH…………..92   DEPARTURE………+54
TOTAL COOLING UNITS FOR THE SEASON…………758   DEPARTURE……..+183
TOTAL COOLING UNITS LAST SEASON TO DATE…….565   DIFFERENCE…….+193

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….18  SSE AT  4:34 P.M.
ASOS……………………20  S   AT  4:08 P.M.
DAVIS…………………..19  SSE AT  4:37 P.M. RMY 25
FASTEST MILE FOR YESTERDAY……………….. 15  SE  AT  4:33 P.M
MAXIMUM 2-MINUTE ASOS AVERAGE………………15  ESE AT  4:09 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..13  SE  AT  4:09 P.M.
AVERAGE WIND SPEED AND DIRECTION………….. 6.3 ESE
ASOS……………………6.5
DAVIS…………………..5.7 SSE  [147 DEG]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.04  DEPARTURE…..-0.09
ASOS……………0.03
TOTAL PRECIPITATION FOR THE MONTH………..0.95  DEPARTURE…..-0.53
ASOS……………0.94
TOTAL PRECIPITATION FOR THE YEAR………..31.20  DEPARTURE…..-5.29
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  92/63/78/+12/0.00/…/..              23 WSW RMY 24
9/8  97/70/84/+18/0.00/…/..              22 WSW RMY 24
9/9  92/70/81/+15/0.00/…/..              30 SSW RMY 33
9/10 73/62/68/+3/…./…/..               29 NE  RMY N/A
9/11 70/59/65/0/…./…/..                33 NE  RMY N/A
9/12 75/58/67/2/…./…/..                18 SSE RMY 25 FOG

9/13 low since midnight is 60F; normal low is now 56F

DAILY RECORDS FOR SEPTEMBER 2015

**9/7 DAILY RECORD MAXIMUM TEMPERATURE OF 92F
TIES PREVIOUS RECORD SET IN 2007**

**9/8 DAILY RECORD MAXIMUM TEMPERATURE OF 97F
BREAKS PREVIOUS RECORD OF 93F SET IN 2007**

**9/8 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F
BREAKS PREVIOUS RECORD OF 69F SET IN 1999**

**9/9 DAILY RECORD MAXIMUM TEMPERATURE OF 92F
BREAKS PREVIOUS RECORD OF 91F SET IN 2002**

**9/9 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F
BREAKS PREVIOUS RECORD OF 69F SET IN 1999**

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

RECORDS FOR SEPTEMBER 13
HIGH 91F IN 1957
LOW 40F IN 1985
PRECIP 3.10 INCHES IN 1987
PEAK GUST 44 MPH WNW IN 1986

RECORDS FOR SEPTEMBER 14
HIGH 90F IN 1931
LOW 34F IN 1911
PRECIP 4.38 INCHES IN 1944 (Great Atlantic Hurricane in 1944)
PEAK GUST 96e MPH E IN 1944 (Great Atlantic Hurricane in 1944)

TODAY’S REPORT PREPARED BY: Robert Millette