Monday, October 12, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, OCTOBER 12, 2015 COLUMBUS DAY
ALL TIMES ARE IN EASTERN STANDARD TIME

INVERSION PRESENT THIS MORNING, TEMPERATURES
CLIMB FROM OVERNIGHT LOW OF 50F INTO THE MID 70S

Temperatures have slowly moderated over the past
couple of days, with temperatures expected to break the
70F degree mark today. Daily normal highs for this part
of October typically run in the lower 60s.

An inversion was present this morning with a completely
clear sky overhead. Thin fog under the inversion limited
visibility to just 20 miles, while mountain tops to the
W and NW were clearly visible above the inversion in the
distance.

By today’s 1:00 PM EST observation skies were almost completely
clear except for a few thin cirrus and cirrocumulus lenticularis
toward the North and West. Temperatures were running much warmer
than normal, with a maximum temperature so far of 75F.
Today’s Observations:

7 A.M.
Weather: Sky clear, inversion present, estimated top 300 feet
over the city (north), thin fog in all directions
Temperature: 53F; Dew Point: 50F; Wind: SSW at 10 kts,
Sea-level pressure: 29.86 ins. Hg, rising, then more slowly
Visibility: 20 miles, except 50 miles WSW-WNW, thin fog and
inversion limiting visibility
6-hr Max temp: 53F
6-hr Min temp: 50F
24-hr precip: 0.00 ins.
BHO SA 1155 CLR 20 111/53/50/2110/986/ SKC VSBY WSW-WNW 50 MI
INVSN PRSNT ESTMD TOP 3 HND OVR CTY N THN FG ALQDS/ 8/000 51007
10053 20050

10 A.M.
Weather: Sky clear
Temperature: 68F; Dew Point 50F; Wind: estimated SW at 5 kts,
Wind Speed: Light
Sea-level pressure: 29.86 ins. Hg, rising, then falling and higher still
Visibility: 70 miles, 65 miles WNW-NE, light distant haze
BHO SA 1455 CLR 70 112/68/50/E2205/986/ SKC VSBY WNW-NE 65 MI
LGT DSNT HZ WNW-NE WND LGT/ 8/000 50001

1 P.M.
Weather: Clear, few cirrocumulus lenticularis distant NW, few
cirrus distant WSW-NE
Temperature: 74F; Dew Point 51F; Wind: SSW at 8 kts,
Sea-level pressure: 29.81 ins. Hg, falling, then more quickly
Visibility: 70 miles, light distant haze
6-hr Max temp: 75F
6-hr Min temp: 53F
BHO SA 1755 CLR 70 095/74/51/2008/981/ FEW CCSL DSNT NW
FEW CI DSNT WSW-NE LGT DSNT HZ ALQDS/ 8/001 58017 10075 20053
SUMMARY FOR SUNDAY, OCTOBER 11, 2015

TEMPERATURE (DEGREES F)
MAX…..67   NORMAL…..62
MIN…..46   NORMAL…..45
MEAN….57   NORMAL…..53

DEPARTURE FROM 30-YEAR NORMAL……………………+4
TOTAL DEPARTURE FOR THE MONTH…………………..-14  [-1.5 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH……………0   DEPARTURE……….-2
TOTAL COOLING UNITS FOR THE SEASON…………810   DEPARTURE……..+211
TOTAL COOLING UNITS LAST SEASON TO DATE…….587   DIFFERENCE…….+223

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………8   DEPARTURE……….-4
TOTAL HEATING UNITS FOR THE MONTH………….121   DEPARTURE……….+9
TOTAL HEATING UNITS FOR THE SEASON…………164   DEPARTURE………-91
TOTAL HEATING UNITS LAST SEASON TO DATE…….212   DIFFERENCE……..-48

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….26 SW   AT 10:32 A.M.
ASOS……………………29 SW   AT 10:02 A.M.
DAVIS…………………..26 SW   AT 10:02 A.M. RMY 28
FASTEST MILE FOR YESTERDAY……………….. 22 SW   AT 10:31 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………21 SSW  AT  3:42 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..20 SW   AT 10:56 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..15.0 SW
ASOS…………………..15.3
DAVIS………………….13.7 SW [232 DEG]

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………..0.79  DEPARTURE…..-0.84
ASOS……………0.78
TOTAL PRECIPITATION FOR THE YEAR………..34.19  DEPARTURE…..-5.78
ASOS…………….N/A ***
*** ASOS annual total not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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

10/1  55/51/53/-4/…./…/..               39 NE  RMY N/A
10/2  51/47/49/-8/…./…/..               40 NE  RMY 43
10/3  51/45/48/-8/…./000/00               38 NE  RMY N/A
10/4  55/49/52/-4/0.00/…/..               35 E   RMY 40
10/5  59/46/53/-3/T/…/..                  21 NE  RMY 20
10/6  68/43/56/+1/0.00/…/..               17 NW  RMY 17
10/7  69/46/58/+3/0.00/…/..               20 W   RMY 20
10/8  63/49/56/+2/0.00/…/..               21 S   RMY N/A
10/9  68/50/59/+5/0.27/…/..               45 S   RMY 49
10/10 59/44/53/-2/0.00/…/..               33 NNW RMY N/A
10/11 67/46/57/+4/0.00/…/..               26 SW  RMY 28

10/12 low since midnight is 50F; normal low is now 44F

DAILY RECORDS FOR OCTOBER 2015

-NONE SO FAR.

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

RECORDS FOR OCTOBER 12
HIGH 87F IN 1954
LOW 31F IN 1906
PRECIP 1.53 INCHES IN 1948
SNOWFALL TRACE IN 1941
PEAK GUST 55 MPH NW IN 1963

RECORDS FOR OCTOBER 13
HIGH 84F IN 1930,1954
LOW 29F IN 2012
PRECIP 5.92 INCHES IN 1895
SNOWFALL 4.2 INCHES IN 1934
PEAK GUST 46e MPH W IN 1950

TODAY’S REPORT PREPARED BY: Brian Fitzgerald