Friday, September 19, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, SEPTEMBER 19, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

VERY SUNNY, BUT UNSEASONABLY COOL DAY
MORNING LOW OF 43F EQUALS LOW FOR SEASON TO DATE
DEW POINTS DOWN TO LOWS FOR SEASON IN LOW 30’S
NNW-N WINDS OVERNIGHT VEER TO N-NNE THIS MORNING
DRY WEATHER PATTERN EXPECTED TO PERSIST….

There’s a mostly sunny sky today, but visibility is limited by some
distant haze to 50 miles. Temperatures are the coolest of the
season to date running in the mid-50’s early this afternoon
along with a light to gentle NE wind. The dew point is down to
32 degrees and the barometer continues to rise past 30.40 inches.

With no rainfall for days now the deficit continues to
increase to over 2 inches below normal for September and
to about 6 inches for the year to date.

Today’s Observations:

7 A.M.
Weather: Clear, line few cumulus NE-ESE, few stratocumulus distant
to the E-ESE, few cirrus N to distant NE, lone patch cirrus W
Temperature: 47F; Dew Point: 33F; Wind: N at 9 kts,
Wind: Direction variable N-NE
Sea-level pressure: 30.33 ins. Hg, rising, then more quickly
Visibility: 35 miles, except 45 miles WNW, hazy
6-hr max temp: 50F
6-hr min temp: 43F
24-hr precip: 0.00
BHO SA 1155 CLR 35 272/47/33/0109/033/ LINE FEW CU NE-ESE
FEW SC DSNT E-SE FEW CI N-DSNT NE AND LONE CI W VSBY WNW 45 HAZY ALQDS
WND 35V05/ 8/801 53028 10050 20043

10 A.M.
Weather: Scattered cumulus/stratocumulus
Temperature: 54F; Dew Point: 34F; Wind: NNE at 12 kts,
Sea-level pressure: 30.38 ins. Hg, rising then more slowly
Visibility: 45 miles
BHO SA 1455 38 SCT 45 288/54/34/0312/038/ CU/SC FRMG DSNT HZ/
8/800 51016

1 P.M.
Weather: Clear, few cumulus and stratocumulus
Temperature: 54F; Dew Point: 32F; Wind: NE at 8 kts,
Wind: Direction variable N-ENE
Sea-level pressure: 30.40 ins. Hg,  rising slightly falling slightly
Visibility: 50 miles, distant haze
6-hr max temp: 56F
6-hr min temp: 47F
BHO SA 1755 CLR 50 295/54/32/0408/040/ FEW CU/SC DSNT HZ/
WND 0VV07/ 8/800 53007 10056 20047

WEATHER SUMMARY FOR THURSDAY, SEPTEMBER 18, 2014

TEMPERATURE (DEGREES F)
MAX…..74    NORMAL…..71
MIN…..52    NORMAL…..54
MEAN….63    NORMAL…..62

DEPARTURE FROM 30-YEAR NORMAL…………………….+1
TOTAL DEPARTURE FOR THE MONTH……………………+40 [+2.0 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..0   DEPARTURE………..-2
TOTAL COOLING UNITS FOR THE MONTH………….86   DEPARTURE……….+38
TOTAL COOLING UNITS FOR THE SEASON………..565   DEPARTURE……….-20
TOTAL COOLING UNITS LAST SEASON TO DATE……694   DIFFERENCE……..-129

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………2  DEPARTURE……….-2
TOTAL HEATING UNITS FOR THE MONTH…………..39  DEPARTURE……….-4
TOTAL HEATING UNITS FOR THE SEASON………….41  DEPARTURE………-27
TOTAL HEATING UNITS LAST SEASON TO DATE……..76  DIFFERENCE……..-35

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………21 N   AT 10:48 P.M. *
ASOS…………………..23 N   AT 10:48 P.M.
DAVIS………………….21 N   AT 10:48 P.M. RMY 23
FASTEST MILE FOR YESTERDAY………………..16 N   AT 10:40 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..16 N   AT 10:38 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….14 N   AT 10:39 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..N/A
ASOS…………………..8.8
DAVIS………………….7.7 NW (310 degrees)
* last of several occurrences

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……….0.20  DEPARTURE……….-2.10
ASOS…………..0.18
TOTAL PRECIPITATION FOR THE YEAR……….31.38  DEPARTURE……….-5.94
ASOS………….31.61

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/-5/0.17/166/22              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 morning low temp: 43F since midnight; normal low now 54F

DAILY RECORDS FOR SEPTEMBER 2014:
None so far.

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

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

RECORDS FOR SEPTEMBER 20
HIGH 90 IN 1983
LOW 34 IN 1979
PRECIP 4.57 INS IN 1899
PEAK GUST 44 MPH NE IN 1972

TODAY’S REPORT PREPARED BY: Robert Skilling