BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, SEPTEMBER 15, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME
 
ANOTHER BEAUTIFUL SEPTEMBER DAY
 
Today has been another very nice, fall-like day.  The temperature has been
quite cool once again, and this morning's low temperature of 48F was the
third coolest of the month so far.  The temperature has risen to 70F so far,
which is just slightly below average, and it will likely rise a bit further.
Winds have shifted from NW to SW today, which has helped to bring in the
slightly warmer air.  The wind was very light at times this morning but has
picked up a little as the day has gone on.  There has been plenty of
sunshine today, along with some cirrus and cumulus clouds, with the cirrus
increasing in coverage throughout the day.  Visibility has once again been
excellent today, up to 80 miles at times.
 
Today's Observations:
 
7 A.M.  
Weather: Scattered cirrus, cumulus distant offshore NNE-E, heavy dew/
condensation all surfaces
Temperature: 51F; Dew Point: 49F; Wind: NW at 6 kts
Sea-level pressure: 30.16 ins. Hg, rising then rising more slowly
Visibility: 70 miles, light distant haze
6-hr min. temp: 48F
BHO SA 1155 240 SCT 70 215/51/49/3206/016/ CU DSNT OFFSHR NNE-E
HVY DEW/CONDENSATION ALL SFCS LGT DSNT HZ/ 8/101 51017 10052 20048
 
10 A.M. 
Weather: Scattered cirrus, thin scattered cirrus, few cumulus and cumulus
fractus all quadrants, few dense cirrus SW-N, thin smoke layer along
horizon NE-ENE
Temperature: 63F; Dew Point: 50F; Wind: Estimated WSW at 4 kts,
Wind: Light and variable
Sea-level pressure: 30.19 ins. Hg, rising slowly then steady
Visibility: 80 miles
BHO SA 1455 220 SCT 250 –SCT 80 223/63/50/E2504/019/ FEW CU AND CUFRA ALQDS
FEW DNS CI SW-N THN K LYR ALG HRZN NE-ENE WND LGT AND VRB/ 8/102 51008
 
1 P.M. 
Weather: Scattered dense cirrus, scattered cirrus, thin scattered cirrus,
few cumulus mostly distant E-SSW
Temperature: 69F; Dew Point: 51F; Wind: SSW at 8 kts,
Wind: Direction variable S-WSW
Sea-level pressure: 30.14 ins. Hg, steady then falling
Visibility: 80 miles
6-hr max. temp: 70F
BHO SA 1755 200 SCT 250 SCT 280 –SCT 80 207/69/51/2108/014/
FEW CU MSTLY DSNT E-SSW WND 19V25/ 8/102 58016 10070 20051
 
WEATHER SUMMARY FOR SATURDAY, SEPTEMBER 14, 2013
 
TEMPERATURE (DEGREES F)
MAX.....67     NORMAL.....72
MIN.....52     NORMAL.....55
MEAN....60     NORMAL.....64
 
DEPARTURE FROM 30-YEAR NORMAL......................-4
TOTAL DEPARTURE FOR THE MONTH......................+9 [+0.4 DEGREE/DAY]
 
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............0   DEPARTURE.........-2
TOTAL COOLING UNITS FOR THE MONTH.............53   DEPARTURE........+12
TOTAL COOLING UNITS FOR THE SEASON...........693   DEPARTURE.......+115
TOTAL COOLING UNITS LAST SEASON TO DATE......764   DIFFERENCE.......-71
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..................21 NW  AT  2:33 A.M.
                   AERO.......................21 NW  AT  2:33 A.M.
                   ASOS.......................22 NW  AT  2:24 A.M.
                   DAVIS......................21 NW  AT  2:34 A.M. RMY 21
FASTEST MILE FOR YESTERDAY....................16 NW  AT  2:25 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE.................16 NW  AT  7:51 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE................15 NW  AT  2:27 A.M.
AVERAGE WIND SPEED AND DIRECTION.............9.9 NW
                   ASOS......................9.5
                   DAVIS.....................8.6 NW [286 degrees]
 
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..........3.50   DEPARTURE.............+1.74
                         ASOS..............3.62
TOTAL PRECIPITATION FOR THE YEAR..........41.51   DEPARTURE.............+4.73
                         ASOS..............N/A*
*ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals 
     
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2013 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
9/1  76/67/72/+4/2.32/008/01         33 S   AERO 39 MPH S   RMY 38   TSTM
9/2  79/67/73/+5/0.43/056/07         30 SSE AERO 33 MPH SSE RMY N/A  TSTM
9/3  79/61/70/+3/0.00/219/28         28 S   AERO 29 MPH S   RMY 30   TSTM
9/4  78/57/68/+1/0.00/733/94         24 W   AERO 25 MPH W   RMY 25
9/5  66/51/59/-8/0.08/179/23         20 NNE AERO 20 MPH NNE RMY 21
9/6  68/46/57/-10/0.00/751/97        18 WSW AERO 17 MPH WSW RMY N/A
9/7  78/51/65/-1/0.00/594/77         20 WSW AERO 21 MPH WSW RMY 21
9/8  74/50/62/-4/0.00/646/84         31 NW  AERO 33 MPH NW  RMY 32
9/9  69/47/58/-8/T/529/69            23 SW  AERO 23 MPH SSW RMY N/A
9/10 73/56/65/0/0.03/007/01          30 S   AERO 32 MPH S   RMY 33
9/11 93/68/81/+14/0.00/654/86        25 SW  AERO 27 MPH SW  RMY N/A
9/12 85/66/76/+11/0.47/.../..        32 S   AERO 33 MPH S   RMY 34   TSTM
9/13 79/58/68/+4/0.17/.../..         24 NNW AERO 25 MPH NNW RMY 23
9/14 67/52/60/-4/0.00/.../..         21 NW  AERO 21 MPH NW  RMY 21
 
9/15 morning low temp: 48F; the normal low is now 55F
 
DAILY RECORDS FOR SEPTEMBER 2013
9/1  - NEW DAILY RECORD MAXIMUM PRECIPITATION OF 2.32 INCHES;
       surpasses previous record of 1.60 inches set in 1927
9/11 - TIED DAILY RECORD MAXIMUM HIGH TEMPERATURE OF 93F;
       ties record of 93F set in 1983
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 15
HIGH 89F IN 1931
LOW 35F IN 1913
PRECIP 3.93 INCHES IN 1904 (Extra-tropical storm making landfall in New
England on 9/15/1904 passing east of BHO and bringing a storm total of
4.11 inches 9/14-15/1904)
PEAK GUST 65e MPH NW, WSW IN 1944 (In the wake of Great Atlantic Hurricane)
 
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
 
TODAY'S REPORT PREPARED BY: Jonathan O'Brien