Tuesday, January 30, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JANUARY 30, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

SNOWSTORM LEAVES 6 INCHES ON TOP OF GREAT
BLUE HILL…

A light snow/ rain mixture began falling yesterday
afternoon and continued on and off throughout the
night. So far today we measured a total of 5.9 ins.
of snow and 0.42 inches of liquid precipitation by
1:00 P.M. Wind from the NNW was moderate today
frequently gusting to 20 kts (23 MPH). With wind
coming from the north temperatures remained below
seasonable with a high of 25F by 1:00 P.M. This is
9 degrees below the daily normal of 34F. We had a
significant decrease in humidity from 95% at
10:00 A.M. to 55% at 1:00 P.M. This allowed for
visibility to greatly increase from 1 1/2 miles
to 70 miles.

Today’s Observations:

7 A.M.
Weather: Light snow and fog, overcast nimbostratus
Temperature: 18F; Dew Point: 16F; Wind: NNW at 9G18 kts
Sea-level pressure: 29.94 ins. Hg, falling then rising
Visibility: 3/4 mile
6-hr Max temp: 24F
6-hr Min temp: 18F
24-hr precip: 0.27 ins.
24-hr snowfall: 3.6 ins.
Snow depth: 4 ins.
BHO SA 1155 E8 OVC 3/4S-F 140/18/16/3309G18/994/ NEW
SNW PST 24 HRS 3.6 INS/ 8/6// 4/004 53003 MANUAL 70027
ASOS 70025 10024 20018

10 A.M.
Weather: Light snow and fog, overcast nimbostratus
Temperature: 19F; Dew Point: 18F; Wind: NNW at 11G18 kts
Sea-level pressure: 29.91 ins. Hg, falling, then more slowly
Visibility: 1 1/2 miles
3-hr precip: 0.14 ins.
3-hr snowfall: 2.2 ins.
BHO SA 1455 E16 OVC 1 1/2S-F 127/19/18/3311G18/991/ NEW
SNW PST 3 HRS 2.2 INS VSBY NNW-NNE 1/2/ 8/6// 58013
MANUAL 6014/ ASOS 60017

1 P.M.
Weather: Overcast stratus
Temperature: 25F; Dew Point: 11F; Wind: NW at 10G16 kts
Sea-level pressure: 29.84 ins. Hg, falling, then more slowly
Visibility: 70 miles
6-hr Max temp: 25F
6-hr Min temp: 17F
6-hr precip: 0.15 ins.
6-hr snowfall: 2.3 ins.
Snow depth: 6 ins.
BHO SA 1755 E40 OVC 70 106/25/11/3210G16/984/ NEW SNW PST
6 HRS 2.3 INS/ 8/6// 4/006 56021 MANUAL 6015/ ASOS 60019
10025 20017

SUMMARY FOR MONDAY, JANUARY 29, 2018

TEMPERATURE (DEGREES F)
MAX…..39   NORMAL…..34
MIN…..25   NORMAL…..17
MEAN….32   NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL……………………….+7
TOTAL DEPARTURE FOR THE MONTH………………………+10 [+0.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….33   DEPARTURE……….-7
TOTAL HEATING UNITS FOR THE MONTH………..1112   DEPARTURE………-35
TOTAL HEATING UNITS FOR THE SEASON……….3234   DEPARTURE……..-218
TOTAL HEATING UNITS LAST SEASON TO DATE…..2946   DIFFERENCE…….+288

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..37 NNE AT 10:06 A.M.
AERO…………………….32 NNE AT 11:06 P.M.***
ASOS…………………….37 NNE AT 11:06 P.M.
DAVIS……………………35 M   AT 11:05 P.M.** RMY 35
FASTEST MILE FOR YESTERDAY………………….24 NNE AT 11:05 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE……………….25 NNE AT 11:06 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………24 M   AT 11:07 P.M.**
AVERAGE WIND SPEED AND DIRECTION…………..14.8 NE
ASOS…………………..15.1
DAVIS………………….13.0 **
* Estimated
** Davis direction malfunctioning
*** Last of multiple occurences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.27  DEPARTURE……+0.13
ASOS…………..0.25
TOTAL PRECIPITATION FOR THE MONTH……….5.85  DEPARTURE……+1.77
ASOS…………..6.39
TOTAL PRECIPITATION FOR THE YEAR………..5.85  DEPARTURE……+1.77
ASOS…………..6.39

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….3.6  DEPARTURE……..+3.0
TOTAL SNOWFALL FOR THE MONTH……………22.9  DEPARTURE……..+6.7
TOTAL SNOWFALL FOR THE SEASON…………..32.2  DEPARTURE………0.0

PRELIMINARY CLIMATE SUMMARY FOR JANUARY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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
M:    Missing data

1/01 11/-5/3/-24/0.00/0.0/538/98        30 NW  AERO 30 NW  RMY 31
1/02 15/-2/7/-20/0.00/0.0/402/73        26 W   AERO 25 W   RMY 26
1/03 28/11/20/-6/0.00/0.0/430/78        23 WSW AERO 20 WSW RMY N/A
1/04 28/18/23/-3/1.66/16.5/000/00       54 NNW AERO 60 NNW RMY 64
1/05 18/2/10/-16/0.00/0.0/431/78        53 W   AERO 53 W   RMY 57
1/06 10/-2/4/-22/0.00/0.0/554/100       43 WSW AERO 47 WSW RMY 47
1/07 14/-8/3/-23/0.00/0.0/549/99        37 WNW AERO 35 WNW RMY N/A
1/08 33/14/24/-2/0.02/T/006/01          40 S   AERO 40 S   RMY 42
1/09 40/25/33/+7/T/T/356/64             37 W   AERO 35 W   RMY 33
1/10 36/20/28/+3/0.00/0.0/553/99        30 W   AERO 30 W   RMY N/A
1/11 50/32/41/+16/0.00/0.0/056/10       33 S   AERO 32 S   RMY 34
1/12 60/45/53/+28/…./0.0/011/02       56 S   AERO 56 S   RMY 55
1/13 60/17/39/+14/…./0.0/265/47       58 SSW AERO 60 SSW RMY 62
1/14 21/11/16/-9/0.00/0.0/350/62        30 NW  AERO 30 NW  RMY N/A
1/15 18/11/15/-10/0.02/0.5/000/00       23 NNW AERO 21 N   RMY 23
1/16 31/18/25/0/0.00/0.0/153/27         17 SSE AERO 15 SSE RMY N/A
1/17 32/29/31/+6/0.23/2.3/…/00        20 SE  AERO 17 SE  RMY N/A
1/18 29/16/23/-2/0.00/0.0/…/..        24 NW  AERO 23 NW  RMY 26
1/19 34/17/26/+1/0.00/0.0/…/..        22 SSW AERO 20 SSW RMY N/A
1/20 45/27/36/+11/0.00/0.0/…/..       38 WSW AERO 37 WSW RMY 39
1/21 47/34/41/+16/0.00/0.0/…/..       22 W   AERO 21 W   RMY N/A
1/22 37/34/36/+11/…./0.0/000/00       21 E   AERO 16 E   RMY N/A
1/23 55/33/44/+19/…./0.0/000/00       53 S   AERO 58 S   RMY 57
1/24 37/22/30/+5/0.00/0.0/…/..        36 WNW AERO 35 WNW RMY 36
1/25 29/17/23/-2/0.00/0.0/…/..        35 WNW AERO 36 WNW RMY 41
1/26 32/15/24-1/0.00/0.0/…/..         28 WNW AERO 28 WNW RMY N/A
1/27 52/24/38/+13/…/0.0/…/..        43 SSW AERO 44 SSW RMY N/A
1/28 50/39/45/+20/…./0.0/…/..       35 SSW AERO 37 SSW RMY N/A
1/29 39/25/32/+7/…./…/000/00        37 NNE AERO 32 NNE RMY 35

1/30 Low temp since midnight is 17F; normal low is now 17F

DAILY RECORDS FOR JANUARY 2018

01/04/18: NEW DAILY RECORD MAXIMUM SNOWFALL OF 16.5 INS.
PREVIOUS RECORD WAS 8.6 INS. SET IN 1923 AND
TIED IN 1942

01/07/18: NEW DAILY RECORD LOW MINIMUM TEMPERATURE OF
-8F, PREVIOUS RECORD OF -7F WAS SET IN 1896

01/12/18: NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF
45F, PREVIOUS RECORD OF 42F WAS SET IN 2017

NEW DAILY RECORD HIGH MAXIMUM TEMPERATURE OF
60F, PREVIOUS RECORD OF 59F WAS SET IN 2017

01/13/18: NEW DAILY RECORD HIGH MAXIMUM TEMPERATURE OF
60F, PREVIOUS RECORD OF 57F WAS SET IN 1890
AND TIED IN 1932

01/28/18: TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF
39F, PREVIOUS RECORD OF 39F WAS SET IN 1974

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

RECORDS FOR JANUARY 30
HIGH 60F IN 1914
LOW -8F IN 1948
PRECIP 1.12 INS. IN 1925
SNOWFALL 6.5 INS. IN 1986
PEAK GUST 76 MPH WNW IN 1962

RECORDS FOR JANUARY 31
HIGH 58F IN 1913, 1947, 2013
LOW -12F IN 1920
PRECIP 1.03 INS. IN 1914
SNOWFALL 9.0 INS. IN 1898
PEAK GUST 75 MPH NW IN 1974

TODAY’S REPORT PREPARED BY: Kaitlin Geagan and Ben Turner