Monday, September 16, 2013
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, SEPTEMBER 16, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME
SHOWERS AND COOL WEATHER
This morning at the summit we had cloudy conditions. This eventually
produce some light rain with a total accumulation of .01 inches by late
this morning. Along, with the rain our temperatures have been very cool.
This morning low was 54F and remains below normal similar to the previous
3 days. The clouds and rain have not allowed the temperatures to warm all that
much. Closing in on the noon hour, our temps have only reached about 57 degrees.
At the 10 o’clock hour there was visible clear skies to the distance W-NW.
Those breaks will are moving westward and should reach the observatory later
this afternoon. This will allow our temperatures to warm up a little. Overall,
this day should finish below normal and it will be the third straight day of
cool weather.
Today’s Observations:
7 A.M.
Weather: Scattered altocumulus, broken altocumulus (2 levels),
overcast altostratus
Temperature: 56F; Dew Point: 51F; Wind: WNW at 8 kts
Sea-level pressure: 30.07 ins. Hg, rising slightly
Visibility: 55 miles
6-hr min. temp: 54F
BHO SA 1155 70 SCT E90 BKN 130 BKN 160 OVC 55 182/56/51/2908/007/
FEW DSNT CU ALG ALG HRZN DSNT SE VIRGA DSNT E-S DRK SW SUN DMLY
VSB DSNT HZ/ 8/17/ 51005 100// 20054
10 A.M.
Weather: Overcast nimbostratus, break in overcast line of clearing
WNW-NNW, line of stratocumulus along horizon, light rain
Temperature: 56F; Dew Point: 54F; Wind: WNW at 6 kts,
Wind: Light and variable
Sea-level pressure: 30.09 ins. Hg, rising slowly
Visibility: 20 miles, S-SE 5 miles, W-NW 45 miles, NE 25 miles
3-hourly precip: 0.01 inch
BHO SA 1455 E60 OVC 20R- 189/56/54/2906/009/ BINOVC ALG HRZN DSNT
WNW-NNW LINE OF SC ALG HRZN DSNT WNW-NNW VSBY SE-S 5 WNW 45 NE 20/
8/52/ 50007 MANUAL 6001/ ASOS 60001
1 P.M.
Weather: Scattered altocumulus (2 levels), broken cirrus,
line of stratocumulus/cumulus/moderate cumulus approaching
SW-NW-NNE, line of clearing altocumulus layers SW-overhead-NNE
Temperature: 62F; Dew Point: 56F; Wind: WNW at 7 kts
Sea-level pressure: 30.07 ins. Hg, falling slightly
Visibility: 60 miles, NW 75 miles distant haze, E-S 20 mile, hazy
6-hr max. temp: 64F
6-hr precip: 0.02 inch
BHO SA 1755 75 SCT 95 SCT 250 BKN 60 182/62/56/2907/007/ LINE OF
SC/CU/MDT CU XTDNG SW-NW-NNE APPRCHNG LINE OF CLRG OF AC LYRS XTDNG
NNE-OVHD-SW VSBY NW 75 E-S 20 HAZY/DRK HZY LGT HZ NW/ 8/271 58007
MANUAL 6002/ ASOS 60001 10064 20056
WEATHER SUMMARY FOR SUNDAY, SEPTEMBER 15, 2013
TEMPERATURE (DEGREES F)
MAX…..70 NORMAL…..72
MIN…..48 NORMAL…..55
MEAN….59 NORMAL…..64
DEPARTURE FROM 30-YEAR NORMAL………………….-5
TOTAL DEPARTURE FOR THE MONTH………………….+4 [+0.1 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……..+10
TOTAL COOLING UNITS FOR THE SEASON………..693 DEPARTURE…….+113
TOTAL COOLING UNITS LAST SEASON TO DATE……764 DIFFERENCE…….-71
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………17 WSW AT 10:20 P.M *
AERO…………………..18 WSW AT 07:50 P.M
ASOS…………………..20 WSW AT 07:51 P.M
DAVIS………………….18 WSW AT 07:51 P.M RMY 20
FASTEST MILE FOR YESTERDAY………………..13 WSW AT 11:47 P.M *
MAXIMUM 2-MINUTE ASOS AVERAGE……………..14 WSW AT 11:50 P.M
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….14 WSW AT 10:20 P.M
AVERAGE WIND SPEED AND DIRECTION………….8.4 WSW
ASOS………………….8.5
DAVIS…………………7.8 W [260 degrees]
* last of several occurrences…
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……….3.50 DEPARTURE………….+1.61
ASOS…………..3.62
TOTAL PRECIPITATION FOR THE YEAR……….41.51 DEPARTURE………….+4.60
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/+16/0.00/654/86 * 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 79/58/69/+5/0.17/…/.. ** 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 70/48/59/-5/0.00/…/.. 17 WSW AERO 18 MPH WSW RMY 20
9/16 morning low temp: 54F; the normal low is now 55F
* 9/11 CORRECTED DEPARTURE FROM +14 TO +16
** 9/13 CORRECTED MEAN FROM 68 TO 69 AND DEPARTURE FROM +4 TO +5
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 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: Robert Skilling and Kevin Pecora
