Tuesday, February 13, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, FEBRUARY 13, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

EXTREME HIGH PRESSURE BRINGS CLEAR DRY SKIES…

We had extremely high pressure today and maxed out
just before 10:00 A.M. At 10:00 A.M. today we had
a sea level pressure of 30.84 ins. Hg . Last time we
had pressure this high was on Nov. 15th, 2015 with
30.88 ins. Hg. As of now this pressure is tied for
ninth place in highest February sea level pressures
on record.

Wind has been light today from the WNW. Temperatures
have been cooler today with a high of 30F so far.
This is 6 degrees below the average of 36F. Visibility
was excellent and increased from 70-80 miles by
1:00 P.M. Skies remained mostly sunny with scattered
cirrus clouds and a few stratocumulus clouds offshore.
It was a dry day with low humidity. The humidity was
down to 41% by 1:00 P.M.

BHO Highest February Sea-Level Pressure, mb (1885-2018):

1) 31.08 in 1981
2) 31.02 in 1920
3) 31.00 in 1887
4) 30.99 in 1906
5) 30.93 in 1948
6) 30.89 in 1938
7) 30.87 in 1889
8) 30.85 in 1934
9) 30.84 in 1951
30.84 in 1979
30.84 in 2018   (pending)
12)30.83 in 1894

Today’s Observations:

7 A.M.
Weather: Scattered cirrus, few distant altocumulus
castellanus distant offshore NNE-ENE
Temperature: 21F; Dew Point: 14F; Wind: NW at 6 kts,
Wind: Light
Sea-level pressure: 30.79 ins. Hg, rising, then more rapidly
Visibility: 70 miles
6-hr Max temp: 26F
6-hr Min temp: 21F
24-hr precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 250 SCT 70 427/21/14/3206/079/ FEW ACCAS DSNT
OFFSHR NNE-ENE WND LGT/ 8/062 53029 10026 20021

10 A.M.
Weather: Scattered cirrostratus, few stratocumulus distant
offshore NNE-E, few patches of dense cirrus in all directions
Temperature: 26F; Dew Point: 12F; Wind: NW at 6 kts,
Wind: Light
Sea-level pressure: 30.84 ins. Hg, rising, then more slowly
Visibility: 75 miles
3-hr precip: 0.00 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 250 SCT 75 443/26/12/3406/084/ FEW SC DSNT OFFSHR
NNE-E FEW PTCHS DNS CI ALQDS WND LGT/ 8/508 51016

1 P.M.
Weather: Scattered cirrostratus, few stratocumulus distant
offshore NNE-E, few patches of cirrocumulus ENE
Temperature: 30F; Dew Point: 9F; Wind: N at 4 kts,
Wind: Light
Sea-level pressure: 30.79 Hg, falling, then more quickly
Visibility:  80 miles
6-hr Max temp: 30F
6-hr Min temp: 21F
6-hr precip: 0.00 ins
6-hr snowfall: 0.0 ins.
Snow depth: 0 in.
BHO SA 1755 250 SCT 80 425/30/09/3604/079/ FEW SC DSNT OFFSHR
NNE-E FEW PTCHS CC ENE WND LGT/ 8/508 58018 10030 20021

SUMMARY FOR MONDAY, FEBRUARY 12, 2018

TEMPERATURE (DEGREES F)
MAX…..53   NORMAL…..36
MIN…..27   NORMAL…..19
MEAN….40   NORMAL…..27

DEPARTURE FROM 30-YEAR NORMAL………………………+13
TOTAL DEPARTURE FOR THE MONTH………………………+46 [+3.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….25   DEPARTURE………-13
TOTAL HEATING UNITS FOR THE MONTH…………416   DEPARTURE………-47
TOTAL HEATING UNITS FOR THE SEASON……….3737   DEPARTURE……..-256
TOTAL HEATING UNITS LAST SEASON TO DATE…..3473   DIFFERENCE…….+264

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..33 WNW  AT 4:42 P.M.
AERO…………………….33 WNW  AT 4:42 P.M.
ASOS…………………….33 NW  AT  4:47 P.M.
DAVIS……………………33 M   AT  4:51 P.M.** RMY N/A
FASTEST MILE FOR YESTERDAY………………….23 WNW AT  4:42 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 WNW AT  4:47 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………23 M   AT  4:47 P.M.**
AVERAGE WIND SPEED AND DIRECTION……………13.3 WNW
ASOS……………………13.2
DAVIS…………………..11.9 **
** Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.51  DEPARTURE……+0.88
ASOS…………..2.65
TOTAL PRECIPITATION FOR THE YEAR………..8.46  DEPARTURE……+2.53
ASOS…………..9.23

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.5
TOTAL SNOWFALL FOR THE MONTH…………….3.6  DEPARTURE……..-2.3
TOTAL SNOWFALL FOR THE SEASON…………..38.1  DEPARTURE……..-1.0

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/…/..      36 SSW AERO 35 SSW RMY N/A
2/2  34/08/21/-5/…./…/…/..       43 WNW AERO 46 WNW RMY 46
2/3  25/04/15/-11/0.00/0.0/…/..      26 S   AERO 24 S   RMY 30
2/4  45/23/34/+8/…/T/…/..          31 SSE AERO 29 S   RMY 30
2/5  46/19/33/+7/0.00/0.0/…/..       47 WNW AERO 47 WNW RMY 44
2/6  31/17/24/+2/T/T/…/..            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/…/..       38 WNW AERO 38 WNW RMY N/A
2/9  30/16/23/-4/0.00/0.0/…/..       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 Low temp since midnight is 21F; 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 13
HIGH 64F IN 1951
LOW -10F IN 1967
PRECIP 2.80 INCHES IN 2008
SNOWFALL 13.5 INCHES IN 1894
PEAK GUST 60 MPH SE IN 1972

RECORDS FOR FEBRUARY 14
HIGH 56F IN 1949
LOW -14F IN 2016
PRECIP 2.09 INCHES IN 2007
SNOWFALL 11.0 INCHES IN 1914
PEAK GUST 83 MPH SSW IN 2000

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