Wednesday, October 21, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, OCTOBER 21, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

RAIN SHOWERS MOVE THROUGH THIS MORNING WITH
STAGNATING, BUT WARM TEMPERATURES

Temperatures have barely fluctuated in the past 24 hours,
though they have remained warmer than normal. Yesterday’s
maximum of 65F was met just after the 1:00 PM EST observation
with temperatures cooling slowly to a very warm 56F for
an overnight minimum temperature. Today’s daily ‘normal’
minimum temperature is 41F.

Light, scattered and intermittent rain showers have brought
just 0.01 inches of new rain by the 10:00 AM EST observation
under mostly cloudy to overcast skies. By the 1:00 PM EST
observation winds had shift to the ENE with mostly cloudy
and cool conditions. Thin fog and a light smoke layer
had reduced visibility to just 15 miles in some directions.
A maximum of 59F had been reached by that time as well.

Today’s Observations:

7 A.M.
Weather: Light rain shower, broken altostratus,
overcast nimbostratus, virga distant SSE,
thin smoke layer distant NNE-ENE
Temperature: 57F; Dew Point: 44F; Wind: WNW at 7 kts,
Sea-level pressure: 30.29 ins. Hg, rising, then more slowly
Visibility: 20 miles, obscured by light rain showers,
thin fog in all directions
6-hr Max temp: 57F
6-hr Min temp: 56F
24-hr precip: Trace
BHO SA 1155 E80 BKN 110 OVC 20RW- 258/57/44/3007/029/
VIRGA DSNT SSE THN K LYR DSNT NNE-ENE THN FG ALQDS/
8/02/ 51018 MANUAL 6000/ 10057 20056

10 A.M.
Weather: Showers in all directions, overcast nimbo/altostratus,
breaks in the overcast W, light rain shower ending 9:45 AM EST
Temperature: 58F; Dew Point 52F; Wind: estimated NNW at 5 kts,
Sea-level pressure: 30.34 ins. Hg, rising, then steady
Visibility: 15 miles, obscured by thin fog and rain showers
in all directions
3-hr precip: 0.01 ins.
BHO SA 1455 E80 OVC 15 273/58/52/E3405/034/
RW-E45 SHWRS ALQDS BINOVC W THN FG ALQDS WND LGT/
8/02/ 51015 ASOS 60001 MANUAL 60001

1 P.M.
Weather: Two layers of broken altocumulus, few cumulus/
stratocumulus NW-SE
Temperature: 57F; Dew Point 52F; Wind: ENE at 7 kts,
Sea-level pressure: 30.32 ins. Hg, steady then falling
Visibility: 15 miles, thin fog and light smoke layer
in all directions
6-hr Max temp: 59F
6-hr Min temp: 56F
6-hr precip: 0.01
BHO SA 1755 E100 BKN 140 BKN 15 266/57/52/0707/032/
VSBY SE-WSW 30 MI FEW CU/SC NW-SE THN FG ALQDS
LGT K LYR ALQDS/ 8/850 58007 ASOS 60001 MANUAL 60001 10059 20056
SUMMARY FOR TUESDAY, OCTOBER 20, 2015

TEMPERATURE (DEGREES F)
MAX…..65 NORMAL…..59
MIN…..43 NORMAL…..41
MEAN….54 NORMAL…..50

DEPARTURE FROM 30-YEAR NORMAL…………………..+4
TOTAL DEPARTURE FOR THE MONTH………………….-19 [-1.1 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……….-5
TOTAL COOLING UNITS FOR THE SEASON…………810 DEPARTURE……..+208
TOTAL COOLING UNITS LAST SEASON TO DATE…….595 DIFFERENCE…….+215

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..11 DEPARTURE……….-4
TOTAL HEATING UNITS FOR THE MONTH………….249 DEPARTURE………+13
TOTAL HEATING UNITS FOR THE SEASON…………292 DEPARTURE………-86
TOTAL HEATING UNITS LAST SEASON TO DATE…….281 DIFFERENCE……..+11

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….28 SW AT 8:29 A.M.*
ASOS……………………27 SW AT 8:19 A.M.
DAVIS…………………..27 SSW AT 8:XX A.M. RMY 28
FASTEST MILE FOR YESTERDAY…………………N/A
MAXIMUM 2-MINUTE ASOS AVERAGE………………21 SW AT 8:19 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..19 WSW AT 8:47 A.M.
AVERAGE WIND SPEED AND DIRECTION………….13.1 WSW
ASOS………………….13.1
DAVIS…………………12.3 WSW [242 Deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….TRACE DEPARTURE…..-0.15
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..1.06 DEPARTURE…..-1.92
ASOS……………1.04
TOTAL PRECIPITATION FOR THE YEAR………..35.20 DEPARTURE…..-6.86
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/…./000/00 39 NE RMY N/A
10/2 51/47/49/-8/…./000/00 40 NE RMY 43
10/3 51/45/48/-8/…./000/00 38 NE RMY N/A
10/4 55/49/52/-4/0.00/474/68 35 E RMY 40
10/5 59/46/53/-3/T/125/18 21 NE RMY 20
10/6 68/43/56/+1/0.00/663/96 17 NW RMY 17
10/7 69/46/58/+3/0.00/640/93 20 W RMY 20
10/8 63/49/56/+2/0.00/678/99 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 76/50/63/+10/0.00/…/.. 22 SSW RMY 24
10/13 70/55/63/+10/0.27/…/.. 23 S RMY 24
10/14 66/46/56/+4/0.00/…/.. 26 W RMY 29
10/15 60/41/51/-1/0.00/…/.. 20 SW RMY 27
10/16 60/44/52/+1/T/…/.. 31 W RMY 34
10/17 54/35/45/-6/T/…/.. 30 WNW RMY 33
10/18 45/28/37/-14/0.00/…/.. 24 NNW RMY 25
10/19 47/26/37/-13/0.00/…/.. 25 SSW RMY 30
10/20 65/43/54/+4/0.00/…/.. 28 SW RMY 28