Wednesday, November 6, 2013

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, NOVEMBER 6, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME

TEMPERATURES RISING THROUGH THE 50’S IN WARMING TREND
SUNSHINE THROUGH VARIABLE MIDDLE AND HIGH CLOUDS

Last night’s low temperature of 39 degrees occurred just before midnight
and has been rising ever since then. Early this afternoon under partly
to mostly sunny skies the temperatures has risen through the 50’s to near
60 degrees as the warming trend begins.

Through October 31, the average temperature for the year-to-date has
climbed to 9th warmest; its highest ranking all year. The year-to-date
wind speed is holding at second lowest on record.

The Aerovane wind system was restored to service at 1322E today, 11/6.
Thank you to our new technician Harris Pitnof.

OCTOBER 2013 PRELIMINARY STATISTICS:
(departures relative to 1981-2010 average)

TEMPERATURE:
Average Max Temp: 62.5F [+2.2F] Average Min Temp: 45.9F [+3.0F] Mean Temp: 54.2F [+2.6F] 24-hr. Corr. Mean Temp: 53.4F [+2.0F] Max Temp: 78F on 2nd
Min Temp: 30F on 29th (first freeze of the season)

Total heating degree day units (month): 331 [-90] *NCDC method
Total heating degree day units (season): 477 [-86] *start July 1 (NCDC)
Total cooling degree day units (month): 5 [0] *NCDC method
Total cooling degree day units (season): 701 [+99] *start Jan 1 (NCDC)

PRECIPITATION:
Total precipitation: 1.09 inches [-3.60 inches] Greatest 24-hr precipitation: 0.56 on 10/6

WIND:
Avg wind speed: 10.7 MPH
Avg corrected wind speed: 11.2 MPH
Prevailing wind direction: W [17%] Peak gust: 48 MPH S on the 7th
Peak fastest mile: 40 MPH S on the 7th

SUNSHINE:
Total astronomical minutes: 11,757 (196.0 hrs.) out of possible
20,551 minutes (342.5 hrs.) or 57%
Total Campbell Stokes card minutes; 11,358 (189.3 hrs.) out of possible
19,824 minutes (330.4 hrs.) or 57%

BHO DRIEST OCTOBERS (INCHES, 1886-2013)
1) 0.22 in 1924
2) 0.39 in 1994
3) 0.50 in 1946
4) 0.61 in 1935
5) 0.63 in 1897
6) 0.79 in 2001
7) 1.09 in 2013
8) 1.15 in 1918
9) 1.24 in 1921
10) 1.25 in 1940

BHO LOWEST OCTOBER WIND SPEED (MPH, 1885-2013)
1) 11.2 in 2013
2) 11.8 in 1997
3) 11.9 in 1994
11.9 in 2004
5) 12.0 in 2007
6) 12.2 in 2008

BHO LOWEST JAN-OCT WIND SPEED (MPH, 1885-2013)
1) 11.7 in 2012
2) 12.1 in 2013
3) 12.2 in 2008
12.2 in 2009
5) 12.4 in 2005
12.4 in 2011

Today’s Observations:

7 A.M.
Weather: Broken altocumuus (2 layers), broken cirrus, virga along horizon
distant ESE
Temperature: 43F; Dew Point: 37F; Wind: S at 10 kts.
Sea-level pressure: 30.45 ins. Hg, falling slightly
Visibility: 50 miles, distant haze mostly SW-NW
6-hr min temp: 40F
BHO SA 1155 E130 BKN 150 BKN 250 BKN 50 313/43/37/1910/045/ DSNT HZ MSTLY
SW-NW VIRGA ALG HRZN DSNT ESE/ 8/071 57007 10043 20040

10 A.M.
Weather: Broken altocumulus, broken cirrus, thin overcast cirrus,
thin spots in overcast, breaks in overcast
Temperature: 51F; Dew Point: 39F; Wind: S at 11 kts,
Sea-level pressure: 30.40 ins. Hg, falling
Visibility: 50 miles, WNW 45 miles, NE-E 60 miles
BHO SA 1455 E130 BKN 220 BKN 250 –OVC 50 293/51/39/1911/040/ OVC PTLY THN
BINOVC ALQDS VSBY WNW 45 HZY VSBY NE-E 60/ 8/031 58020

1 P.M.
Weather: Scattered altocumulus lenticularis, large patch vicinity,
scattered cirrocumulus, scattered cirrus, thin broken cirrus
Temperature: 56F; Dew Point: 40F; Wind: SSW at 16 kts,
Sea-level pressure: 30.31 ins. Hg, falling
Visibility: 60 miles, distant haze
6-hr max temp: 58F
BHO SA 1755 180 SCT 220 SCT 250 –SCT 300 –BKN 60 263/56/40/2016/031/ CU
FRMG XCPT N-NE AC/LGE PTCH ACSL VC OVHD-S-W FEW PTCHS CC DSNT HZ/ 8/141
58030 10058 20043

WEATHER SUMMARY FOR TUESDAY, NOVEMBER 5, 2013

TEMPERATURE (DEGREES F)
MAX…..50 NORMAL…..54
MIN…..29 NORMAL…..37
MEAN….40 NORMAL…..45

DEPARTURE FROM 30-YEAR NORMAL………………….-5
TOTAL DEPARTURE FOR THE MONTH………………….+6 [+1.0 DEGREE/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..25 DEPARTURE……..+15
TOTAL HEATING UNITS FOR THE MONTH…………..96 DEPARTURE……… 0
TOTAL HEATING UNITS FOR THE SEASON…………573 DEPARTURE……..-87
TOTAL HEATING UNITS LAST SEASON TO DATE…….513 DIFFERENCE…….+60

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………16 SSW AT 10:00 A.M.
AERO………………….N/A
ASOS…………………..17 SSW AT 10:56 P.M.
DAVIS………………….16 S AT 7:16 P.M. RMY 17
FASTEST MILE FOR YESTERDAY………………..13 S AT 7:16 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..13 SSW AT 11:40 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….13 S AT 7:18 P.M.
AVERAGE WIND SPEED AND DIRECTION………….7.3 S
ASOS………………….7.2
DAVIS…………………6.6 SSW [210 degrees]

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……….0.16 DEPARTURE………….-0.62
ASOS…………..0.16
TOTAL PRECIPITATION FOR THE YEAR……….43.17 DEPARTURE………….-1.38
ASOS…………..N/A**
**ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………0.0 DEPARTURE………….-0.1
TOTAL SNOWFALL FOR THE MONTH………….Trace DEPARTURE………….-0.2
TOTAL SNOWFALL FOR THE SEASON…………Trace DEPARTURE………….-0.5

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER & NOVEMBER 2013 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
RMY: RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized

10/1 75/50/63/+6/0.00/676/96 16 WNW AERO 16 MPH WNW RMY 18
10/2 78/56/67/+10/0.00/666/95 29 W AERO 30 MPH W RMY 29
10/3 77/56/67/+11/0.00/628/90 20 WNW AERO 20 MPH WNW RMY N/A
10/4 67/56/62/+6/0.26/028/04 18 NW AERO 20 MPH NW RMY N/A
10/5 67/56/62/+6/0.01/125/18 14 ENE AERO 12 MPH ENE RMY N/A
10/6 58/53/56/+1/0.56/000/00 20 NE AERO 20 MPH NE RMY N/A
10/7 75/57/66/+11/0.07/213/31 48 S AERO 55 MPH S RMY 55
10/8 65/50/58/+4/0.00/581/85 25 NW AERO 27 MPH NW RMY 28
10/9 59/49/54/0/0.00/545/80 25 ENE AERO 24 MPH ENE RMY 25
10/10 61/46/54/0/0.00/095/14 18 NE AERO 17 MPH NE RMY 18
10/11 67/50/59/+6/0.00/473/70 20 NE AERO 20 MPH NE RMY N/A
10/12 59/50/55/+2/0.02/007/01 30 ENE AER0 31 MPH ENE RMY 32
10/13 59/46/53/0/0.00/482/72 23 ENE AERO 23 MPH ENE RMY 23
10/14 64/42/53/+1/0.00/580/87 15 SSW AERO 15 MPH SSW RMY 15
10/15 66/50/58/+6/0.00/266/40 16 ESE AERO 16 MPH ESE RMY N/A
10/16 60/49/55/+4/0.00/013/02 23 ESE AERO 24 MPH ESE RMY 23
10/17 70/52/61/+10/0.06/277/42 21 S AERO 23 MPH S RMY N/A
10/18 67/50/59/+8/T/630/96 32 WNW AERO 32 MPH W RMY 31
10/19 65/45/55/+5/0.00/379/58 21 W AERO 22 MPH W RMY N/A
10/20 61/44/53/+3/0.00/644/99 33 W AERO 36 MPH W RMY 34
10/21 67/43/55/+5/0.00/648/100 23 SSW AERO 25 MPH SSW RMY 27
10/22 69/44/57/+8/T/419/65 25 SSW AERO 27 MPH SSW RMY 27
10/23 50/40/45/-4/0.00/103/16 18 WNW AERO 18 MPH WNW RMY N/A
10/24 53/36/45/-4/0.00/640/100 31 W AERO 31 MPH W RMY 34
10/25 49/34/42/-7/0.00/401/63 25 WNW AERO 26 MPH WNW RMY 26
10/26 54/34/44/-4/0.00/521/82 35 SW AERO 36 MPH SSW RMY 39
10/27 55/39/47/-1/0.04/480/76 30 W AERO 30 MPH W RMY 29
10/28 58/35/47/-1/0.00/529/84 31 W AERO 33 MPH W RMY 34
10/29 50/30/40/-7/0.00/614/98 15 N AERO 15 MPH N RMY 15
10/30 51/38/45/-2/0.02/094/15 16 W AERO 15 MPH W RMY N/A
10/31 61/43/52/+5/0.05/000/00 37 SSW AERO N/A N/A RMY N/A

11/1 68/56/62/+16/0.10/…/.. 60 SSW AERO N/A N/A RMY 66
11/2 65/49/57/+11/0.00/…/.. 22 WSW AERO N/A N/A RMY 23
11/3 49/30/40/-6/0.06/…/.. ** 23 N AERO N/A N/A RMY N/A
11/4 42/27/35/-10/0.00/…/.. 24 NNE AERO N/A N/A RMY 25
11/5 50/29/40/-5/0.00/…/.. 16 SSW AERO N/A N/A RMY 17

11/6 morning low temp: 40F; the normal low is now 37F

** trace of snow on 11/3

DAILY RECORDS FOR OCTOBER 2013
None

DAILY RECORDS FOR NOVEMBER 2013
None so far.

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

RECORDS FOR NOVEMBER 6
HIGH 71 IN 1959
LOW 22 IN 1951
PRECIP 1.72 INCHES IN 1907
SNOWFALL 8.0 IN 1894
PEAK GUST 63 W IN 1973

RECORDS FOR NOVEMBER 7
HIGH 75 IN 1938
LOW 21 IN 1930
PRECIP 2.02 INCHES IN 1953
SNOWFALL 3.5 IN 2012
PEAK GUST 69e ENE IN 1953

TODAY’S REPORT PREPARED BY: Robert Skilling