Saturday, January 24, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JANUARY 24, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

SNOW BEGAN JUST AFTER 4 A.M. AND CONTINUED
A CHANGE FROM SNOW TO LIGHT FREEZING RAIN OCCURRED
A LITTLE MORE SNOW AT TIMES AS FREEZING DRIZZLE STARTS
GENERALLY INTERMITTENT LIGHT FREEZING RAIN
WINDS BECOMING NORTH-NORTHEAST BY EARLY AFTERNOON

Total snowfall measured 2.1 inches through 7 A.M. and
at the changeover to freezing rain between 8 and 9 A.M.
the total had reached 3.0 inches at least for the first
part of this storm.  The 9 A.M. temperature was 31 degrees
and thin glaze was forming. If precipitation had remained
snow we would have had over 5 inches by early afternoon.

Today’s Observations:

7 A.M.
Weather: Obscurement snow and fog, light snow occasionally
moderate snow, total new snow past 3/24 hours 2.1 ins.
Temperature: 30F; Dew Point: 30F; Wind: SW at 6 kts
Sea-level pressure: 29.76 ins. Hg, falling then more rapidly
Visibility: 1/8 mile, light snow occasionally moderate snow
and dense fog
6-hr max temp: 31F
6-hr min temp: 29F
24-hr precip: 0.20 in.
6/24 hr snowfall: 2.1 ins.
Total snow on ground: 2 inches
BHO SA 1155 W3 1/8S-F 077/30/30/2205/976/
OCNL S TOTAL NEW SNW PST 6/24 HRS 2.1 INS/ 8////
4/002 58019 MANUAL 6020/ MANUAL 70020 ASOS 60018 70018
10031 20029

10 A.M.
Weather: Obscurement with heavy fog, light snow, freezing rain
ended past hour, thin glaze
Temperature: 31F; Dew Point: 31F; Wind: NE at 7 kts
Sea-level pressure: 29.60 ins. Hg, falling then more slowly
Visibility: 1/16 mile, light snow and heavy fog
3-hr precip: 0.23 in.
3-hr snowfall 1.0 in.
BHO SA 1455 W3 1/16S-F 023/31/31/0507/960/ ZRESBUKN THN GLZ
TOTAL NEW SNW 3 HRS 1.0 IN/ 8//// 56054
MANUAL 6023/ ASOS 60022

1 P.M.
Weather: Oscurement with heavy fog,
Temperature: 32F; Dew Point: 32F; Wind: NNE at 8 kts,
Sea-level pressure: 30.15 ins. Hg, falling, then more rapidly
Visibility:
6-hr max. temp: 32F
6-hr min. temp: 30F
6-hr precip: 0.42
6-hr snowfall: 0.5
BHO SA 1755 W3X 1/16ZL-F 946/32/32/0312/937/ INTMT ZR- WND GST
19 KTS PST HR TOTAL NEW SNW PST 6 HRS 0.5 IN/ 8//// 58077
ASOS 60042 MANUAL 6042/ 10032 20030

SUMMARY FOR FRIDAY, JANUARY 23, 2015

TEMPERATURE (DEGREES F)
MAX…..36   NORMAL…..34
MIN…..18   NORMAL…..17
MEAN….27   NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL……………………..+2
TOTAL DEPARTURE FOR THE MONTH…………………….-22 [-1.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..38  DEPARTURE………..-2
TOTAL HEATING UNITS FOR THE MONTH………….931  DEPARTURE……….+22
TOTAL HEATING UNITS FOR THE SEASON………..2991  DEPARTURE………-222
TOTAL HEATING UNITS LAST SEASON TO DATE……3159  DIFFERENCE……..-168

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………25 SSW   AT  8:35 P.M.
ASOS…………………..26 SW    AT  7:40 P.M.
DAVIS………………….24 SSW   AT  7:08 P.M. RMY 26
FASTEST MILE FOR YESTERDAY………………..20 SW    AT  8:29 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..20 SW    AT  8:29 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….19 SSW   AT  8:28 P.M.
AVERAGE WIND SPEED AND DIRECTION…………11.2 SW
ASOS…………………11.0
DAVIS………………..10.1 WSW [250 degrees] * last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.20  DEPARTURE…..+0.06
ASOS…………..0.18
TOTAL PRECIPITATION FOR THE MONTH……….1.94  DEPARTURE…..-1.32
ASOS…………..2.00
TOTAL PRECIPITATION FOR THE YEAR………..1.94  DEPARTURE…..-1.32
ASOS…………..2.00

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………,2.1  DEPARTURE……+1.6
TOTAL SNOWFALL FOR THE MONTH…………….4.9  DEPARTURE……-5.8
TOTAL SNOWFALL FOR THE SEASON…………..18.0  DEPARTURE…..-10.8

PRELIMINARY CLIMATE SUMMARY FOR JANUARY 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

1/1  31/18/25/-2/0.00/0.0/544/99              29 SSW RMY 30
1/2  37/26/32/+5/0.00/0.0/314/57              35 WSW RMY 38
1/3  34/21/28/+2/0.67/2.5/017/03              25 SE  RMY 26
1/4  51/33/42/+16/0.48/0.0/000/00             30 SSW RMY N/A
1/5  46/13/30/+4/0.00/0.0/542/98              48 W   RMY 54
1/6  15/10/13/-13/0.02/0.4/000/00             29 W   RMY N/A
1/7  22/01/12/-14/0.01/0.3/383/69             43 WNW RMY 47
1/8  16/-5/6/-20/0.00/0.0/539/97              39 WNW RMY N/A
1/9  27/16/22/-4/0.08/0.9/201/36              35 WSW RMY 38
1/10 22/11/17/-8/0.00/0.0/541/97              26 WNW RMY 27
1/11 31/9/20/-5/45/0.00/0.0/123/22            26 SSW RMY N/A
1/12 36/31/34/+9/0.23/T/000/00                29 NNW RMY N/A
1/13 33/11/22/-3/0.00/0.0/524/93              30 NNW RMY 29
1/14 22/11/17/-8/T/T/000/00                   18 NNW RMY 16
1/15 27/20/24/-1/0.09/0.8/000/00              20 WSW RMY 22
1/16 35/12/24/-1/T/T/341/60                   46 WSW RMY 50
1/17 21/5/13/-12/0.00/0.0/558/98              30 WNW RMY N/A
1/18 50/19/35/+10/0.16/0.0/000/00             47 SE  RMY 52
1/19 44/28/36/+11/T/0.0/304/53                33 W   RMY 36
1/20 36/23/30/+5/0.00/0.0/495/86              28 W   RMY 28
1/21 30/17/24/-1/0.00/0.0/358/62              21 WNW RMY N/A
1/22 36/25/31/+6/T/T/…/..                   20 WNW RMY 20
1/23 36/18/27/+2/0.00/0.0/…/..              25 SSW RMY 26

1/24 morning low temp: 29F since midnight; normal low is now 17F

DAILY RECORDS FOR JANUARY 2015
None so far.

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

RECORDS FOR JANUARY 24
HIGH 60F IN 1967
LOW -12F IN 1907
PRECIP 2.04 INS. IN 1998
SNOWFALL 11.3 INS. IN 1935
PEAK GUST 82 MPH S IN 1996

RECORDS FOR JANUARY 25
HIGH 56F IN 2010
LOW -10F IN 1935
PRECIP 2.24 INS. IN 1979
SNOWFALL 12.5 INS. IN 1941
PEAK GUST 81 MPH WNW IN 1972

TODAY’S REPORT PREPARED BY: Robert Skilling