Friday, September 18, 2015
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, SEPTEMBER 18, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME
87F ON THURSDAY SETS NEW DAILY RECORD,
SURPASSING PREVIOUS RECORD OF 86F, SET
AND TIED IN 1915, 1941 AND 1991.
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Yesterday’s maximum temperature of 87F, which lasted for
nearly an hour between 2:00 and 3:00 PM EST set a new daily
record maximum temperature, beating the old record by 1 degree.
Overnight, temperatures dipped to 64F, which if temperatures
stay warmer than that through midnight, will tie today’s
daily record high minimum of 64F, set back in 1992.
Temperatures were quick to warm this morning, as an inversion
set up between the summit and neighboring valleys, limiting
visibility below the summit and in the distance to 40 miles
with hazy conditions. Today’s daily record of 88F, may potentially
be tied or beaten depending on this afternoon’s heat.
By the 1:00 PM EST observation temperatures had reached a
maximum of 86F so far, with only a few small cumulus and
high cirrus distant to SE to SW. Visibility had become
much hazier, and had fallen to just 35 miles under otherwise
clear conditions.
Today’s Observations:
7 A.M.
Weather: Clear, few cirrus distant ESE-SW, inversion present
with top of inversion estimated 400 feet over the city N
Temperature: 69F; Dew Point: 57F; Wind: WNW at 8 kts,
Sea-level pressure: 30.06 ins. Hg, rising, then more quickly
Visibility: 40 miles, hazy
6-hr Max temp: 69F
6-hr Min temp: 64F
24-hr precip: 0.00 in.
BHO SA 1155 CLR 40 180/69/57/2908/006/ FEW CI DSNT ESE-SW
INVSN PRSNT ESTMD TOP 4 HND OVR CTY N HAZY/ 8/001 53010 10069 20064
10 A.M.
Weather: Clear, few cirrus distant ESE-SSW, dark smoke layer
distant WSW-ENE
Temperature: 80F; Dew Point 60F; Wind: estimated W at 3 kts,
Wind Speed: Light
Sea-level pressure: 30.07 ins. Hg, rising, then falling but higher still
Visibility: 40 miles, hazy
BHO SA 1455 CLR 40 183/80/60/E2703/007/ FEW CI DSNT ESE-SSW
DRK K LYR DSNT WSW-ENE HAZY WND LGT/ 8/001 50003
1 P.M.
Weather: Clear, few small cumulus distant SE-S and SW,
few cirrus distant ESE-SE
Temperature: 85F; Dew Point: 57F; Wind: S at 7 kts
Sea-level pressure: 30.03 ins. Hg, falling, then more quickly
Visibility: 35 miles, hazy
6-hr Max: 86F
6-hr Min: 69F
BHO SA 1755 CLR 35 171/85/57/1807/003/ FEW SML CU DSNT SE-S AND SW
FEW CI DSNT ESE-SE HAZY/ 8/101 58012 10086 20069
SUMMARY FOR THURSDAY, SEPTEMBER 17, 2015
TEMPERATURE (DEGREES F)
MAX…..87 NORMAL…..71
MIN…..64 NORMAL…..54
MEAN….76 NORMAL…..63
DEPARTURE FROM 30-YEAR NORMAL…………………..+13
TOTAL DEPARTURE FOR THE MONTH………………….+101 [+5.7 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..11 DEPARTURE……….+9
TOTAL COOLING UNITS FOR THE MONTH………….115 DEPARTURE………+69
TOTAL COOLING UNITS FOR THE SEASON…………781 DEPARTURE……..+198
TOTAL COOLING UNITS LAST SEASON TO DATE…….565 DIFFERENCE…….+216
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….17 SW AT 10:35 P.M.
ASOS……………………18 SW AT 10:35 P.M.
DAVIS…………………..17 SW AT 10:31 P.M. RMY 16
FASTEST MILE FOR YESTERDAY……………….. 13 WSW AT 10:35 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………14 WSW AT 12:10 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..12 W AT 5:41 A.M.
AVERAGE WIND SPEED AND DIRECTION……………9.0 W
ASOS……………………9.4
DAVIS…………………..8.1 W [259 DEG]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.00 DEPARTURE…..-0.14
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..1.35 DEPARTURE…..-0.81
ASOS……………1.33
TOTAL PRECIPITATION FOR THE YEAR………..31.60 DEPARTURE…..-5.57
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/+5/0.00/766/97 20 SSW RMY 20
9/2 89/64/77/+9/0.00/732/93 20 SW RMY 21
9/3 85/66/76/+9/T/612/78 17 E RMY N/A TSTM
9/4 72/58/65/0/0.00/297/38 31 ENE RMY N/A
9/5 77/55/66/-1/0.00/748/96 14 SW RMY 18
9/6 87/57/72/+5/0.00/753/97 21 SSW RMY 22
9/7 92/63/78/+12/0.00/727/94 23 WSW RMY 24
9/8 97/70/84/+18/0.00/693/90 22 WSW RMY 24
9/9 92/70/81/+15/0.00/683/89 30 SSW RMY 33
9/10 73/62/68/+3/…./000/00 29 NE RMY N/A
9/11 70/59/65/0/…./084/11 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 84/62/73/+10/0.00/…/.. 17 NW RMY N/A
9/17 87/64/76/+13/0.00/…/.. 17 SW RMY 16
9/18 low since midnight is 64F; normal low is now 54F
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**
**9/17 DAILY RECORD MAXIMUM TEMPERATURE OF 87F
BREAKS PREVIOUS RECORD OF 86F SET IN 1915, 1941, AND 1991**
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR SEPTEMBER 18
HIGH 88F IN 1906
LOW 36F IN 1919
PRECIP 4.25 INCHES IN 1996
PEAK GUST 77e MPH WNW IN 1948
RECORDS FOR SEPTEMBER 19
HIGH 87F IN 1906,1983
LOW 37F IN 1929
PRECIP 3.69 INCHES IN 1936
PEAK GUST 55 MPH S IN 2012
TODAY’S REPORT PREPARED BY: Brian Fitzgerald
