Saturday, November 21, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, NOVEMBER 21, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

SEASONABLE COOLER WEATHER RETURNS TODAY…CLOUDS THIS
MORNING DEPART WITH BRIGHT SUNSHINE THIS AFTERNOON…

Middle and high level clouds moved through this morning
as the temperature dropped from the upper 50’s yesterday
afternoon to the middle 30’s this morning.  The maximum
temperature for the day has only reached the middle 40s
as of the 1 PM EST observation.  Clouds have diminished
this afternoon with a few middle level clouds and higher
cirrus decorating the sky.  At the 1 PM observation, a
few altocumulus clouds were observed to be dropping
some virga within a larger patch of altocumulus to the
northwest. The visibility has been very high all day
near 75 miles due to much drier air with the dew points
falling into the 20s today.

Today’s Observations:

7 A.M.
Weather: Scattered altostratus, overcast cirrus fibratus
and cirrostratus, few altocumulus distant SE-SSE, breaks
in overcast NE and SSE-WNW, thin spots in overcast all
quadrants
Temperature: 35F; Dew Point: 23F; Wind: N at 10 kts
Sea-level pressure: 30.29 ins. Hg, rising
Visibility: 75 miles
6-hr Max temp: 40F
6-hr Min temp: 35F
24-hr precip: 0.00 ins.
BHO SA 1155 200 SCT E250 OVC 75 258/35/23/3510/029/ FEW AC
DSNT SE-SSE BINOVC DSNT NE AND SSE-WNW THN SPTS IOVC ALQDS/
8/076 51023 10040 20035

10 A.M.
Weather: Broken altocumulus, few cumulus distant SE, few
cirrus N
Temperature: 42F; Dew Point 36F; Wind: NNE at 10 kts,
Sea-level pressure: 30.30 ins. Hg, rising slightly
Visibility: 75 miles
BHO SA 1455 E180 BKN 75 260/42/36/0310/030/ FEW CU DSNT SE
FEW CI N/ 8/031 53002

1 P.M.
Weather: Scattered altocumulus (2 layers), thin scattered
cirrus fibratus, few altocumulus with virga NW
Temperature: 45F; Dew Point: 31F; Wind: NE at 9 kts
Sea-level pressure: 30.23 ins. Hg. falling then more quickly
Visibility: 75 miles
6-hr max. temp. 46F
6-hr min. temp. 35F
BHO SA 1755 140 SCT 180 SCT 250 -SCT 75 236/45/31/0509/023/
FEW AC/VIRGA NW/ 8/031 58024 10046 20035

SUMMARY FOR FRIDAY, NOVEMBER 20, 2015

TEMPERATURE (DEGREES F)
MAX…..58   NORMAL…..49
MIN…..41   NORMAL…..32
MEAN….50   NORMAL…..40

DEPARTURE FROM 30-YEAR NORMAL…………………+10
TOTAL DEPARTURE FOR THE MONTH………………..+131  [+6.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..15   DEPARTURE………-10
TOTAL HEATING UNITS FOR THE MONTH………….302   DEPARTURE……..-130
TOTAL HEATING UNITS FOR THE SEASON…………756   DEPARTURE……..-239
TOTAL HEATING UNITS LAST SEASON TO DATE…….889   DIFFERENCE…….-133

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….43 SSE AT  3:05 A.M.
ASOS……………………48 SSE AT  2:41 A.M.
DAVIS…………………..46 SSE AT  2:39 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………33 SSE AT  3:04 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………29 SSE AT  3:05 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..31 SSE AT  3:04 A.M.
AVERAGE WIND SPEED AND DIRECTION……………15.4 NW
ASOS……………………14.4
DAVIS…………………..13.4 WNW [286 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.00  DEPARTURE…..-0.16
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..1.98  DEPARTURE…..-1.17
ASOS……………2.02
TOTAL PRECIPITATION FOR THE YEAR………..38.81  DEPARTURE…..-8.11
ASOS…………….N/A ***
*** ASOS annual total not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 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

11/1  59/45/52/+6/T/006/01                  30 SSW RMY 31
11/2  62/47/55/+9/0.00/476/77               24 W   RMY N/A
11/3  71/44/58/+12/0.00/616/100             25 W   RMY 25
11/4  66/49/58/+13/0.00/601/98              22 SSW RMY N/A
11/5  72/51/62/+17/0.00/281/46              31 SW  RMY 36
11/6  71/60/66/+21/0.00/109/18              35 SSW RMY 38
11/7  64/46/55/+10/0.00/029/04              33 WNW RMY 35
11/8  54/39/47/+3/0.00/591/98               26 NW  RMY 30
11/9  59/38/49/+5/0.00/577/96               20 W   RMY 21
11/10 53/45/49/+5/…./000/00               28 NE  RMY N/A
11/11 48/43/46/+3/…./000/00               41 NE  RMY N/A
11/12 55/42/49/+6/…./000/00               28 S   RMY 30
11/13 57/41/49/+6/…./385/65               40 WSW RMY 47
11/14 45/31/38/-4/0.00/425/72               40 NW  RMY 47
11/15 51/31/41/-1/0.00/…/..               25 W   RMY 27
11/16 59/36/48/+6/0.00/…/..               25 NNW RMY 29
11/17 45/28/37/-4/0.00/…/..               18 NNE RMY N/A
11/18 50/35/43/+2/0.00/…/..               17 SSE RMY N/A
11/19 55/38/47/+6/…./…/..               29 SSE RMY N/A
11/20 58/41/50/+10/…./…/..              43 SSE RMY N/A

11/21 low since midnight is 35F; normal low is now 32F

DAILY RECORDS FOR NOVEMBER 2015

**11/6 DAILY RECORD MAXIMUM TEMPERATURE OF 71F
TIES PREVIOUS RECORD OF 71F SET IN 1959

**11/6 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 60F
BREAKS PREVIOUS RECORD OF 58F SET IN 1938

**11/6 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 60F
TIES PREVIOUS MONTHLY RECORD OF 60F SET ON
11/8/1996

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

RECORDS FOR NOVEMBER 21
HIGH 69 IN 1931
LOW 10 IN 1888
PRECIP 2.60 INCHES IN 1950
SNOWFALL 4.0 INS IN 1929
PEAK GUST 69 NW IN 1989

RECORDS FOR NOVEMBER 22
HIGH 70 IN 1931
LOW 12 IN 1987
PRECIP 1.78 INS IN 2005
SNOWFALL 9.0 INS IN 1971
PEAK GUST 70e SE IN 1945

TODAY’S REPORT PREPARED BY: Mike Iacono