Sunday, February 18, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, FEBRUARY 18, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

SNOW THIS MORNING CLEARS OUT TO AVERAGE TEMPERATURES

After 5.8 inches of snow fell during the overnight hours, skies
cleared quickly as the pressure rose.  Temperatures are on
the rise under sunny skies and the snow is already beginning to
melt.

As of the 10 o’clock observation, generally clear skies have
prevailed despite high humidity near the surface.  Despite the
moisture, visibility has greatly increased to 75 miles with
temperatures climbing into the mid 30s.

Today’s Observations:

7 A.M.
Weather: Fog
Temperature: 29F; Dew Point: 29F; Wind: NW at 12 kts
Sea-level pressure: 29.97 ins. Hg, rising, then more rapidly
Visibility:  1/2 mile
6-hr Max temp: 30F
6-hr Min temp: 29F
24-hr precip:  0.60 ins.
24-hr snowfall: 5.8 ins.
Snow depth:  6 ins.
BHO SA 1155 W3 X 1/2F 148/29/29/3212/997/ NEW SNW PST 24 HRS 5.8 INS
FOG/ 8//// 53032 MANUAL 70060 ASOS 70058 10030 20029

10 A.M.
Weather: Few cumulus all quandrants, few stratus fractus WSW-WNW
Temperature: 34F; Dew Point: 29F; Wind: NW at 15G25 kts,
Sea-level pressure: 30.12 ins. Hg, rising then more quickly
Visibility: 75 miles
3-hr precip: 0.00
3-hr snowfall: 0.0 ins.
BHO SA 1455 CLR 75 202/34/29/3115G25/012/ FEW CU ALQDS FEW STR FRA
WSW-WNW/ 8/700 53054

SUMMARY FOR SATURDAY, FEBRUARY 17, 2018

TEMPERATURE (DEGREES F)
MAX…..38   NORMAL…..37
MIN…..23   NORMAL…..19
MEAN….31   NORMAL…..28

DEPARTURE FROM 30-YEAR NORMAL………………………+3
TOTAL DEPARTURE FOR THE MONTH………………………+81 [+4.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….34   DEPARTURE………-3
TOTAL HEATING UNITS FOR THE MONTH…………566   DEPARTURE………-82
TOTAL HEATING UNITS FOR THE SEASON……….3887   DEPARTURE……..-291
TOTAL HEATING UNITS LAST SEASON TO DATE…..3656   DIFFERENCE…….+231

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..33 SSW AT 7:44 P.M.
AERO…………………….29 SSW AT 7:44 P.M.
ASOS…………………….33 SSW AT 7:47 P.M.
DAVIS……………………31   M AT 7:46 P.M.** RMY 33
FASTEST MILE FOR YESTERDAY………………….22 SSW AT 7:41 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 SSW AT 7:43 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………21   M AT 7:43 P.M.**
AVERAGE WIND SPEED AND DIRECTION…………….9.9 NW
ASOS…………………….9.7
DAVIS……………………8.9 **

** Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.60  DEPARTURE……+0.45
ASOS…………..0.58
TOTAL PRECIPITATION FOR THE MONTH……….3.15  DEPARTURE……+0.79
ASOS…………..3.28
TOTAL PRECIPITATION FOR THE YEAR………..9.15  DEPARTURE……+2.44
ASOS…………..9.85

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….5.8  DEPARTURE……..+5.3
TOTAL SNOWFALL FOR THE MONTH…………….9.4  DEPARTURE……..+1.0
TOTAL SNOWFALL FOR THE SEASON…………..43.9  DEPARTURE……..+2.3

PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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

2/1  45/27/36/+10/…./0.0/120/20      36 SSW AERO 35 SSW RMY N/A
2/2  34/08/21/-5/…./2.5/223/37       43 WNW AERO 46 WNW RMY 46
2/3  25/04/15/-11/0.00/0.0/557/92      26 S   AERO 24 S   RMY 30
2/4  45/23/34/+8/…/T/000/00          31 SSE AERO 29 S   RMY 30
2/5  46/19/33/+7/0.00/0.0/464/76       47 WNW AERO 47 WNW RMY 44
2/6  31/17/24/+2/T/T/025/04            26 SSW AERO 23 SSW RMY 23
2/7  42/21/32/+5/0.62/1.1/000/00       45 SW  AERO 46 SW  RMY 47
2/8  30/20/25/-2/0.00/0.0/501/81       38 WNW AERO 38 WNW RMY N/A
2/9  30/16/23/-4/0.00/0.0/384/62       28 S   AERO 25 S   RMY N/A
2/10 51/28/40/+13/…./0.0/…/..      31 S   AERO 30 S   RMY 31
2/11 46/36/41/+14/…./0.0/000/00      24 SW  AERO 21 SW  RMY N/A
2/12 53/27/40/+13/…./0.0/…/..      33 WNW AERO 33 WNW RMY N/A
2/13 31/21/26/-2/0.00/0.0/…/..       22 S   AERO 18 WNW RMY 21
2/14 46/25/36/+8/0.00/0.0/…/..       30 S   AERO 26 SSW RMY 29
2/15 47/35/41/+13/…./0.0/000/00      23 SSW AERO 20 SSW RMY N/A
2/16 50/31/41/+13/…./0.0/…/..      45 W   AERO 44 W   RMY 42
2/17 38/23/31/+3/…./../…/..        33 SSW AERO 29 SSE RMY 33

2/18 Low temp since midnight is 29F; normal low is now 19F

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

RECORDS FOR FEBRUARY 18
HIGH 65F IN 1981
LOW -10F IN 1958
PRECIP 1.97 INCHES IN 1887
SNOWFALL 9.2 INCHES IN 1952
PEAK GUST 70 MPH S IN 2008

RECORDS FOR FEBRUARY 19
HIGH 66F IN 1981
LOW -5F IN 1923
PRECIP 2.73 INCHES IN 1972
SNOWFALL 12.0 INCHES IN 1893
PEAK GUST 76 MPH ENE IN 1972

TODAY’S REPORT PREPARED BY: Robert Millette