Wednesday, September 16, 2015
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, SEPTEMBER 16, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME
DRY, WARM, SUNNY STRETCH CONTINUES
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Yesterday’s maximum temperature of 82F, which came after the
1:00 PM EST observation, marks a return to above normal temperatures
that have become common this September. Today’s daily normal
maximum temperature of 72F was surpassed well before this morning’s
10:00 AM EST observation.
Clear conditions have been in place all day once again, with light
distant haze reducing visibility somewhat to 70 miles in all directions.
By the 1:00 PM EST observation skies had become more hazy with a very
light SSW wind. A maximum temperature of 83F had been recorded as well,
already 11 degrees above normal for this date. Today’s daily record
maximum of 91F, set back in 1939, 1941, appears to be safe to today;
however, tomorrow’s record of 86F, set in 1915, 1941 and 1991 may
be more vulnerable.
Today’s Observations:
7 A.M.
Weather: Clear, few thin cirrus distant SE-W
Temperature: 67F; Dew Point: 58F; Wind: N at 7 kts,
Sea-level pressure: 30.32 ins. Hg, rising, then more slowly
Visibility: 70 miles, light distant haze, dark smoke layer
distant N-ENE
6-hr Max temp: 67F
6-hr Min temp: 62F
24-hr precip: 0.00 in.
BHO SA 1155 CLR 70 268/67/58/3607/032/ FEW THN CI DSNT SE-W DRK K
LYR ALNG HRZN N-ENE LGT DSNT HZ ALQDS/ 8/001 51009 10067 20062
10 A.M.
Weather: Thin scattered cirrus
Temperature: 78F; Dew Point 59F; Wind: estimated S at 2 kts,
Wind Speed and Direction: Light and Variable
Sea-level pressure: 30.34 ins. Hg, rising, then falling but higher still
Visibility: 70 miles, light distant haze
BHO SA 1455 250 -SCT 70 274/78/59/E1902/034/ LGT DSNT HZ ALQDS
WND LGT AND VRB/ 8/001 50006
1 P.M.
Weather: Thin scattered cirrus
Temperature: 83F; Dew Point: 58F; Wind: estimated SSW at 4 kts
Wind Speed: Light
Sea-level pressure: 30.29 ins. Hg, falling, then more quickly
Visibility: 50 miles, light distant haze
6-hr Max: 83F
6-hr Min: 67F
BHO SA 1755 250 -SCT 50 259/83/58/E2104/029/ LGT DSNT HZ ALQDS
WND LGT/ 8/001 58015 10083 20067
SUMMARY FOR TUESDAY, SEPTEMBER 15, 2015
TEMPERATURE (DEGREES F)
MAX…..82 NORMAL…..72
MIN…..56 NORMAL…..55
MEAN….69 NORMAL…..64
DEPARTURE FROM 30-YEAR NORMAL……………………+5
TOTAL DEPARTURE FOR THE MONTH…………………..+78 [+5.0 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………4 DEPARTURE……….+2
TOTAL COOLING UNITS FOR THE MONTH…………..96 DEPARTURE………+53
TOTAL COOLING UNITS FOR THE SEASON…………762 DEPARTURE……..+182
TOTAL COOLING UNITS LAST SEASON TO DATE…….565 DIFFERENCE…….+197
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23 W AT 12:29 A.M.*
ASOS……………………24 W AT 12:16 A.M.
DAVIS…………………..21 W AT N/A RMY N/A
FASTEST MILE FOR YESTERDAY……………….. 17 W AT 12:16 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………18 W AT 12:30 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..16 W AT 12:31 A.M.
AVERAGE WIND SPEED AND DIRECTION……………11.4 WNW
ASOS……………………11.6
DAVIS…………………..9.9 WNW [298 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………..1.35 DEPARTURE…..-0.53
ASOS……………1.33
TOTAL PRECIPITATION FOR THE YEAR………..31.60 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
9/13 66/60/63/-1/…./000/00 25 E RMY N/A
9/14 70/53/62/-2/0.00/…/.. 33 W RMY 35
9/15 82/56/69/+5/0.00/…/.. 23 W RMY N/A
9/16 low since midnight is 62F; normal low is now 55F
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 16
HIGH 91F IN 1939,1941
LOW 39F IN 1984
PRECIP 5.12 INCHES IN 1933 (Hurricane)
PEAK GUST 59 MPH SSE IN 1999
RECORDS FOR SEPTEMBER 17
HIGH 86F IN 1915,1941,1991
LOW 38F IN 1959
PRECIP 2.73 INCHES IN 1933
PEAK GUST 60 MPH WNW IN 1999
TODAY’S REPORT PREPARED BY: Brian Fitzgerald
