Saturday, February 27, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, FEBRUARY 27, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

A BRIEF RETURN TO WINTER! ALBEIT SHORT-LIVED
ARCTIC AIR MASS ARRIVES LATE YESTERDAY AND OVERNIGHT
LOW TEMPERATURE DROPS TO 16F; 6 DEG. BELOW NORMAL
FOR FIRST TIME SINCE FEBRUARY 19TH
PATCHES OF THIN ICE FORM ON NEARBY PONDS

The arrival of an Arctic air mass dropped the temperature
down from a high of 38 degrees at mid-day yesterday to 22
degrees at midnight and then to 16 degrees by 6:30 A.M.
Yesterday was the first day since February 19, which also
had a minimum temperature of 16 degrees, that the
temperature went below normal. The dew point dropped to near
zero overnight and the ski area began making new snow.
A bit of thin ice formed on the completely thawed Houghton’s
and Ponkapoag Ponds. Both ponds were considered to be
completely thawed on February 25th. Both ponds had frozen
late this year on January 5th.

Today’s Observations:

7 A.M.
Weather: Clear, stratocumulus offshore distant ENE-ESE,
cirrus ESE-SW
Temperature: 18F; Dew Point: 6F; Wind: WNW at 6 kts,
Sea-level pressure: 30.07 ins. Hg, rising then more slowly
Visibility: 75 miles, distant light haze
6-hr Max temp: 21F
6-hr Min temp: 16F
BHO SA 1155 CLR 75 182/18/6/2906/007/ SC OFFSHR DSNT ENE-ESE
CI ESE-SW LGT DSNT HZ/ 8/501 51013 10021 20016

10 A.M.
Weather: Thin broken cirrus, two levels, clear sky W-NE
Temperature: 25F; Dew Point: 4F; Wind: W at 5 kts,
Wind: Light
Sea-level pressure: 30.07 ins. Hg, rising then more slowly
Visibility: 75 miles
BHO SA 1455 250 -BKN 300 -BKN 75 184/25/4/2505/007/
CLR SKY W-NE WND LGT/ 8/001 50002

1 P.M.
Weather: Clear, cirrus distant ESE-SSW AND distant W-NW
Temperature: 35F; Dew Point: 4F; Wind: SSW at 9 kts
Wind: Direction variable w
Sea-level pressure: 30.00 ins. Hg, rising then more slowly
Visibility: 75 miles, light distant haze
6-hr Max temp: 35F
6-hr Min temp: 18F
BHO SA 1755 CLR 75 158/34/4/2109/000/ CI LYRS DSNT ESE-SSW/W-NW
LGT DSNT HZ WND 17V24/ 8/001 58026 10035 20018

SUMMARY FOR FRIDAY, FEBRUARY 26, 2016

TEMPERATURE (DEGREES F)
MAX…..38   NORMAL…..39
MIN…..22   NORMAL…..21
MEAN….30   NORMAL…..30

DEPARTURE FROM 30-YEAR NORMAL……………………..0
TOTAL DEPARTURE FOR THE MONTH……………………+97 [+3.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..35   DEPARTURE………..0
TOTAL HEATING UNITS FOR THE MONTH………….870   DEPARTURE………-98
TOTAL HEATING UNITS FOR THE SEASON………..3612   DEPARTURE……..-887
TOTAL HEATING UNITS LAST SEASON TO DATE……4499   DIFFERENCE……-1001

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….42 WNW AT 1:55 A.M.
ASOS……………………41 W   AT 12:20 P.M.
DAVIS…………………..41 WNW AT 12:20 P.M. RMY 41
FASTEST MILE FOR YESTERDAY…………………30 W   AT 9:37 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………29 W   AT 9:37 A,M,
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..26 W   AT 1:12 A.M.
AVERAGE WIND SPEED AND DIRECTION……………19.3 W
ASOS……………………19.3
DAVIS…………………..16.4 WNW [300 Deg.]

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……….5.60 DEPARTURE……+1.86
ASOS…………..6.02
TOTAL PRECIPITATION FOR THE YEAR………..9.37 DEPARTURE…….+1.28
ASOS…………..9.96

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0 DEPARTURE…….-0.5
TOTAL SNOWFALL FOR THE MONTH……………22.5 DEPARTURE…….+9.5
TOTAL SNOWFALL FOR THE SEASON…………..38.1 DEPARTURE…….-8.0

PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/ AERO/RMY GUST
AERO: Aerovane wind recording system 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

2/1   64/40/52/+26/0.00/0.0/305/51          36 WNW AERO 37 W   RMY 34
2/2   48/31/40/+14/0.00/0.0/602/100         23 NW AERO 23 WNW RMY N/A
2/3   55/34/45/+19/0.80/0.0/000/00          55 SSE AERO 58 SSE RMY 53
2/4   55/39/47/+21/…./0.0/000/00          37 W   AERO 36 W   RMY 35
2/5   39/19/29/+3/…./12.5/000/00          37 NNW AERO 39 NNW RMY 35
2/6   35/17/26/0/0.00/0.0/532/87            25 SSW AERO 24 SSW RMY 23
2/7   43/26/35/+8/0.00/0.0/…/..           35 ENE AERO 35 ENE RMY N/A
2/8   36/16/26/-1/…./…/000/00           53 NE AERO 55 NE RMY 53
2/9   26/17/22/-5/…./…/000/00           21 N   AERO 22 N   RMY N/A
2/10 33/21/27/+0/0.01/0.0/…/..           23 W   AERO 23 W   RMY 21
2/11 26/7/17/-10/T/T/…/..                39 W   AERO 47 W   RMY 42
2/12 23/4/13/-14/0.00/0.0/…/..           31 WNW AERO 38 WNW RMY 21
2/13 21/-7/7/-21/0.00/0.0/…/..           41 W   AERO 46 WNW RMY 43
2/14 10/-14/-2/-30/0.00/0.0/632/100        33 WNW AERO 46 WNW RMY N/A
2/15 32/-2/15/-13/…./1.2/…/..          24 E   AERO 28 E   RMY N/A
2/16 55/32/44/+16/…./0.0/…/..          65 SSE AERO 69 SSE RMY 64
2/17 43/30/37/+9/0.00/0.0/…/..           33 W   AERO 35 W   RMY N/A
2/18 32/20/26/+3/0.00/0.0/…/..           25 NNW AERO 29 NW RMY 25
2/19 39/16/28/-1/0.01/T/…/..             24 SSW AERO 26 SSW RMY N/A
2/20 58/31/45/+16/…./…/…/..          44 SSW AERO 44 SSW RMY 41
2/21 53/39/46/+17/0.00/0.0/…/..          39 WNW AERO 43 WNW RMY 39
2/22 45/29/37/+8/0.00/0.0/…/..           18 NW AERO 20 NW RMY 17
2/23 37/25/31/+1/…./T/…/..             26 E   AERO 26 E   RMY N/A
2/24 60/33/47/+17/…./0.0/000/00          60 S   AERO 66 S   RMY N/A
2/25 63/37/50/+15/…./0.0/…/..          76 S   AERO 84 S   RMY N/A
2/26 38/22/30/0/…./0.0/…/..            42 WNW AERO 44 WNW RMY 41