Tuesday, September 23, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, SEPTEMBER 23, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

CRISP AND CRYSTAL CLEAR MORNING TO START THE FIRST DAY OF FALL

After recording a daytime maximum of 72F yesterday mid
day, the mercury began to fall through the night to an
overnight low of 44F. Dew points in the upper 30s along
with clear skies allowed for impressive visibilities of
nearly 90 miles, the station maximum, at the 7:00 AM EST
observation.

Another day without rain yesterday has increased the precipitation
deficit to -2.62 inches below the norm for the month of September,
and -6.46 inches for the year. The month of September is likely
to fall well below normal for rainfall.

Today’s Observations:

7 A.M.
Weather: Clear, few cirrostratus distant E-SW
Temperature: 49F; Dew Point: 38F; Wind: estimated W at 3 kts,
Sea-level pressure: 30.26 ins. Hg, rising, then more slowly
Visibility: 85 miles
6-hr max temp: 49F
6-hr min temp: 44F
24-hr precip: 0.00
BHO SA 1155 CLR 85 246/49/38/E2803/026/ FEW CS DSNT E-SW/ 8/005
51023 10049 20044

10 A.M.
Weather: Clear, few cirrostratus distant E-SW
Temperature: 59F; Dew Point: 37F; Wind: estimated WNW at 5 kts,
Wind Speed and Direction: Light and Variable
Sea-level pressure: 30.30 ins. Hg, rising, then more slowly
Visibility: 80 miles
BHO SA 1455 CLR 80 260/59/37/E2905/030/ FEW CS DSNT E-SW WND LGT
AND VRB/ 8/005 51014

1 P.M.
Weather: Clear, few cumulus distant WNW-NNE, few altocumulus
lenticularis distant WNW-NW, few cirrostratus distant E-SW,
few cirrus fibratus W-NNW
Temperature: 66F; Dew Point: 39F; Wind: WNW at 7 kts,
Sea-level pressure: 30.29 ins. Hg, rising, then falling and lower
Visibility: 75 miles, 80 miles NE, light distant haze ENE-NNE
6-hr max temp: 69F
6-hr min temp: 49F
BHO SA 1755 CLR 75 256/66/39/3007/029/ FEW CU DSNT WNW-NNE
FEW ACSL DSNT WNW-NW FEW CS DSNT E-SW FEW CI W-NNW VSBY NE 80 MI
LGT DSNT HZ ENE-NNE/ 8/146 58004 10069 20049

WEATHER SUMMARY FOR MONDAY, SEPTEMBER 22, 2014

TEMPERATURE (DEGREES F)
MAX…..72 NORMAL…..69
MIN…..48 NORMAL…..52
MEAN….60 NORMAL…..61

DEPARTURE FROM 30-YEAR NORMAL…………………….-1
TOTAL DEPARTURE FOR THE MONTH……………………+33 [+1.3 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..0 DEPARTURE………..-1
TOTAL COOLING UNITS FOR THE MONTH………….92 DEPARTURE……….+39
TOTAL COOLING UNITS FOR THE SEASON………..571 DEPARTURE……….-19
TOTAL COOLING UNITS LAST SEASON TO DATE……696 DIFFERENCE……..-125

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………5 DEPARTURE………..0
TOTAL HEATING UNITS FOR THE MONTH…………..66 DEPARTURE……….+4
TOTAL HEATING UNITS FOR THE SEASON………….68 DEPARTURE………-19
TOTAL HEATING UNITS LAST SEASON TO DATE……..81 DIFFERENCE……..-13

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………33 W AT 11:45 A.M.
ASOS…………………..37 W AT 11:46 A.M.
DAVIS………………….33 W AT 10:49 A.M. RMY 35
FASTEST MILE FOR YESTERDAY………………..27 W AT 1:43 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE……………..26 W AT 1:43 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….24 W AT 10:49 A.M.
AVERAGE WIND SPEED AND DIRECTION………….15.6 W
ASOS………………….14.8
DAVIS…………………13.6 W (273 degrees)
* last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE……….-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.26 DEPARTURE……….-2.62
ASOS…………..0.23
TOTAL PRECIPITATION FOR THE YEAR……….31.44 DEPARTURE……….-6.46
ASOS………….31.66

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 88/69/79/+11/0.00/710/90 16 W RMY 19
9/2 91/70/81/+13/0.00/495/63 24 S RMY 27 TSTM
9/3 83/67/75/+8/0.00/681/87 24 NW RMY 27
9/4 86/61/74/+7/0.00/758/97 20 SW RMY 22
9/5 89/66/78/+11/0.00/731/94 25 SSW RMY 29
9/6 90/67/79/+12/T/481/62 33 SSW RMY 36 TSTM
9/7 77/62/70/+4/0.03/687/89 26 NW RMY N/A
9/8 74/57/66/+0/0.00/601/78 25 ENE RMY 25
9/9 71/59/65/-1/0.00/384/50 23 ENE RMY 23
9/10 71/58/65/0/0.00/329/43 20 NE RMY 20
9/11 78/60/69/+4/0.00/099/13 31 SW RMY 35
9/12 72/51/62/-3/0.00/735/97 25 NNW RMY 22
9/13 67/50/59/-5/0.17/159/21 23 E RMY 24
9/14 66/47/57/-7/0.00/685/91 25 NW RMY 24
9/15 67/43/55/-9/0.00/698/93 17 W RMY 18
9/16 66/52/59/-4/T/…/.. 16 SW RMY 16
9/17 72/50/61/-2/0.00/…/.. 16 NW RMY 17
9/18 74/52/63/+1/0.00/…/.. 21 N RMY 23
9/19 56/43/50/-12/0.00/…/.. 21 NE RMY 23
9/20 71/45/58/-4/…./…/.. 29 S RMY 30
9/21 80/61/71/+10/0.06/…/.. 26 SSE RMY 27
9/22 72/48/60/-1/0.00/…/.. 33 W RMY 35