Thursday, April 9, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, APRIL 9, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

LIGHT SNOW, ICE PELLETS, FREEZING RAIN/DRIZZLE
AND CONTINUED COLD LINGER INTO THURSDAY

Light snow began briefly at 12:20 EST yesterday, quickly
transitioning to ice pellets which fell for at least a couple
of hours before mixing with and changing to all rain.

Overnight rain turned to freezing rain as temperatures dipped
just below the freezing mark by 1:00 AM EST this morning. Heavier
rain transitioned to freezing drizzle at this time, accumulating
0.25 inches of glaze ice on most surfaces, including our
wind instruments, slowing some of the peak gusts this morning
before they could be de-iced. Temperatures rose above the freezing
mark soon after the 7:00 AM EST observation, but have struggled to
reach a maximum of 35F by the 1:00 PM EST observation. Since the
7:00 AM EST observation 0.07 inches of continuous drizzle
have fallen.

Both ponds remain partially frozen, with Houghton’s pond now at 30%
and Ponkapoag Pond at now 60%. Both ponds have not
completely thawed yet, meaning as of today, April 9th,
both ponds are in the top ten latest thaws on record and climbing
(see list below).

The month of March averaged 4.3 degrees colder than normal,
and also finished 2.33 inches of total liquid precipitation
drier than normal. Snowfall however, was just about normal,
with 13.3 inches falling, just 0.6 inches above the norm.
Seasonal snowfall was a new record at 150.8 inches.

A cold March along with an even colder January through
February have resulted in the coldest start to any
year since 1934, and the third coldest average minimum
temperature on record:

BHO Coldest Jan-Mar Mean Temperature, deg F (1885-2015)

1) 21.4 in 1885
2) 22.1 in 1923
3) 22.8 in 1904
4) 23.2 in 1888
5) 23.5 in 1920
23.5 in 1934
7) 23.6 in 1893
23.6 in 1912
9) 23.8 in 2015
10) 24.2 in 1916

BHO Coldest Jan-Mar Average Minimum Temperature, deg F (1885-2015)

1) 13.4 in 1885
2) 14.9 in 1923
3) 15.0 in 2015
4) 15.2 in 1888
15.2 in 1934
6) 15.3 in 1904
7) 16.6 in 1920
8) 16.7 in 1912
9) 16.8 in 1887
16.8 in 1893

BHO Greatest Seasonal Snowfall, inches (1885-2015):

1) 150.8 in 2014-2015 (through 1 PM April 9th)
2) 144.4 in 1995-1996
3) 136.0 in 1947-1948
4) 119.4 in 2004-2005
5) 113.1 in 2002-2003
6) 111.5 in 1915-1916
7) 109.6 in 1966-1967
8) 106.8 in 1955-1956
9) 103.4 in 1903-1904
10)102.5 in 1922-1923

Latest Houghton’s Pond Thaw Date, (1886-2014)

1) April 14, 1926
2) April 10, 1887
April 10, 1888
4) April 9, 1923
5) April 8, 1993
6) April 7, 1899
April 7, 1956
8) April 6, 1916
April 6, 1917
April 6, 1924
April 6, 1940

Latest Ponkapoag Pond Thaw Date, (1886-2014)

1) April 10, 1926
2) April 9, 1923
3) April 6, 1940
4) April 5, 1916
April 5, 1924
6) April 4, 1967
April 4, 1994

——————————————————-

PRELIMINARY STATS FOR MARCH 2015

TEMPERATURE, Deg. F
Avg. Max. 39.6 [-4.8] Avg. Min. 22.8 [-3.8] Mean      31.2 [-4.3] Corrected mean: 31.0
Max. for month: 55 on 3/11
Min. for month:  5 on 3/6

HEATING DEGREE DAYS
Total heating units: 1035 [+119] Total for the season: 5743 [+259] Total for last season: 5627

PRECIPITATION, Inches
Total: 3.25 [-2.33] Greatest in 24 hrs: N/A

SNOWFALL, Inches
Total: 13.3 [+0.6] Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 13.0
Avg. corrected wind speed: 13.4
Prevailing wind direction: NW @ 16%
Peak gust and direction: 53 NW on the 17th

SUNSHINE:
Astronomical total minutes:   11107/22218 or 50%
Campbell-Stokes card minutes: 10758/21516 or 50%

For more information about this historic winter, visit our
web site at bluehill.org.

——————————————————-

Today’s Observations:

7 A.M.
Weather: Light drizze, fog
Temperature: 32F; Dew Point: 32F; Wind: ENE at 13G22 kts,
Sea-level pressure: 30.36 ins. Hg, rising, then more slowly
Visibility: 3/4 of a mile, except 1/4 of a mile W-NE,
obscured by light drizzle and fog
6-hr Max temp: 32F
6-hr Min temp: 32F
24-hr precip: 0.71 inch
24-hr snowfall: Trace of ice pellets
Ice accumulation: 0.25 inches of freezing rain/drizzle
Snow depth: Trace
BHO SA 1155 W4 X 3/4L-F 281/32/32/0613G22/036/
VSBY W-NE 1/4 MI GLZ ICE 0.25 NEW SNW PST 24 HRS TRACE/
8//// 51014 ASOS 60008 70065 MANUAL 70071 10032 20032

10 A.M.
Weather: Light drizzle, fog
Temperature: 34F; Dew Point: 34F; Wind: ENE at 12G20 kts,
Sea-level pressure: 30.39 ins. Hg, rising, then more quickly
Visibility: 1/2 of a mile, except 1/4 of a mile W-NE
3-hr precip: 0.04 inches
BHO SA 1455 W3 X 1/2L-F 290/34/34/0612G20/039/
VSBY W-NE 1/4 MI/ 8//// 53009 ASOS 60005 MANUAL 70004

1 P.M.
Weather: Light drizzle, fog
Temperature: 35F; Dew Point: 35F; Wind: ENE at 13G22 kts
Sea-level pressure: 30.37 ins. Hg, rising, then falling
Visibility: 1/2 of a mile, obscured by fog and light drizzle
6-hr Max temp: 35F
6-hr Min temp: 32F
6-hr precip: 0.07 inches
BHO SA 1755 W3 X 1/2L-F 284/35/35/0713G22/037/
8//// 58006 ASOS 60009 MANUAL 60007 10035 20032

SUMMARY FOR WEDNESDAY, APRIL 8, 2015

TEMPERATURE (DEGREES F)
MAX…..41   NORMAL…..52
MIN…..32   NORMAL…..35
MEAN….37   NORMAL…..44

DEPARTURE FROM 30-YEAR NORMAL…………………..-7
TOTAL DEPARTURE FOR THE MONTH………………….-12 [-1.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..28  DEPARTURE………..+7
TOTAL HEATING UNITS FOR THE MONTH………….194  DEPARTURE……….+13
TOTAL HEATING UNITS FOR THE SEASON………..5937  DEPARTURE………+272
TOTAL HEATING UNITS LAST SEASON TO DATE……5785  DIFFERENCE……..+152

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………30 ENE AT  9:45 A.M.
ASOS…………………..32 E   AT  9:46 A.M.
DAVIS………………….28 ENE AT  8:18 A.M. RMY 32
FASTEST MILE FOR YESTERDAY………………..24 ENE AT  9:45 A.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE……………..23 E   AT  9:47 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….21 ENE AT  9:46 A.M.
AVERAGE WIND SPEED AND DIRECTION…………13.8 ENE
ASOS…………………14.0
DAVIS………………..11.8 ENE [061 degrees] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.71  DEPARTURE…..+0.55
ASOS……………0.65
TOTAL PRECIPITATION FOR THE MONTH………..1.18  DEPARTURE…..-0.17
ASOS……………1.11
TOTAL PRECIPITATION FOR THE YEAR………..15.77  DEPARTURE…..+0.55
ASOS…………….N/A ***
*** ASOS annual totals not available due to erroneous readings

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………TRACE  DEPARTURE…..-0.2
TOTAL SNOWFALL FOR THE MONTH……………TRACE  DEPARTURE…..-1.4
TOTAL SNOWFALL FOR THE SEASON…………..150.8  DEPARTURE….+89.7

PRELIMINARY CLIMATE SUMMARY FOR MARCH AND APRIL CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/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

3/1  29/14/22/-9/0.24/2.7/000/00              25 SSW RMY 25
3/2  35/22/29/-2/0.02/0.2/480/71              44 WNW RMY 48
3/3  32/13/23/-9/0.34/2.8/340/50              33 S   RMY N/A
3/4  41/32/37/+5/0.04/0.0/000/00              33 SW  RMY 36
3/5  36/16/26/-6/0.02/0.2/000/00              28 NW  RMY 29
3/6  26/5/16/-16/0.00/0.0/681/99              28 NW  RMY 25
3/7  38/13/26/-7/0.00/0.0/567/82              30 WSW RMY 30
3/8  41/25/33/0/T/T/208/30                    38 WNW RMY 41
3/9  45/28/37/+4/0.00/0.0/565/81              40 W   RMY 39
3/10 52/32/42/+9/0.09/0.0/252/36              28 S   RMY 27
3/11 55/38/47/+13/0.02/0.0/604/86             37 WNW RMY N/A
3/12 38/23/31/-3/0.00/0.0/677/96              44 N   RMY 48
3/13 40/18/29/-5/0.00/0.0/581/82              23 SSW RMY 26
3/14 41/29/35/0/0.84/0.0/000/00               23 SSW RMY 23
3/15 41/24/33/-2/0.03/0.6/021/03              39 NW  RMY 39
3/16 44/23/34/-1/0.00/0.0/516/72              28 NW  RMY N/A
3/17 48/25/37/+1/0.17/T/173/24                53 NW  RMY 63
3/18 30/19/25/-11/0.00/0.0/700/97             51 NW  RMY 56
3/19 31/15/23/-13/0.00/0.0/696/96             37 NW  RMY 39
3/20 32/19/26/-11/…./…/102/14             17 NNW RMY 15
3/21 41/25/33/-4/…./…/000/00              36 WNW RMY N/A
3/22 36/17/27/-10/0.00/0.0/712/97             50 W   RMY 55
3/23 31/14/23/-15/0.00/0.0/700/95             36 WNW RMY 35
3/24 39/16/28/-10/0.00/0.0/636/86             20 NNW RMY N/A
3/25 48/25/37/-1/0.08/0.0/572/77              32 S   RMY 31
3/26 54/35/45/+6/…./…/052/07              32 SSW RMY 32
3/27 41/36/39/+0/…./0.0/000/00              22 NNE RMY N/A
3/28 36/26/31/-8/0.44/5.0/000/00              30 NNW RMY 30
3/29 40/21/31/-9/0.00/0.0/701/93              26 NW  RMY N/A
3/30 43/28/36/-4/T/T/091/12                   36 SSW RMY 39
3/31 46/32/39/-2/0.00/0.0/479/63              28 W   RMY 30

4/1  44/26/35/-6/0.00/0.0/…/..              30 WNW RMY 31
4/2  59/29/44/+3/T/0.0/…/..                 39 SSW RMY 43
4/3  56/47/52/+10/0.02/0.0/…/..             36 SW  RMY N/A
4/4  49/32/41/-1/…./0.0/…/..              54 NW  RMY 64
4/5  47/30/39/-4/…./0.0/…/..              40 W   RMY 45
4/6  48/33/41/-2/0/00/0.0/…/..              18 NE  RMY N/A
4/7  39/34/37/-6/…./0.0/000/00              21 NE  RMY N/A
4/8  41/32/37/-7/…./T/…/..                30 ENE RMY 32

4/9  low since midnight is 32F normal low is 35F

DAILY RECORDS FOR MARCH 2015

3/28- NEW RECORD DAILY SNOWFALL: 5.0 INCHES;
surpasses the previous record of 3.0 ins. in 1932

DAILY RECORDS FOR APRIL 2015

4/3 – NEW RECORD DAILY HIGH MINIMUM TEMPERATURE: 47F
surpasses the previous record of 46F in 1892

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

RECORDS FOR APRIL 9
HIGH 83 IN 1991
LOW 18 IN 1888
PRECIP 2.38 IN. IN 1935
SNOWFALL 11.0 IN. IN 1917
PEAK GUST 72 MPH WNW IN 1962

RECORDS FOR APRIL 10
HIGH 83 IN 1922
LOW 20 IN 1985
PRECIP 2.40 IN. IN 1935
SNOWFALL 10.1 IN. IN 1996
PEAK GUST 66 MPH WNW IN 1967

TODAY’S REPORT PREPARED BY: Brian Fitzgerald