Thursday, February 27, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, FEBRUARY 27, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

FOGGY, RAINY START GIVES WAY TO SPLASHES OF SUN
AND NEAR PERFECT VISIBILITY…

Today began with light rain and thick fog. Overnight
rainfall of 0.58 inches was greatly needed to chip away
at our deficit. This was our largest 24hr precipitation
event since December 31, 2019! We added another 0.16 inches
by 10AM, bringing the storm total to 0.74 inches. Fog thinned
out just before the 10AM observation yielding an
increasing ceiling and improved visibility. By 1PM,
Mount Monadnock in southwestern New Hampshire was clearly
spotted indicating near perfect visibility! A broken cloud
deck has existed for much of the day allowing for some
splashes of sun to poke through.

Also of note is the wind. Winds began to increase out
of the southwest topping out at 45 MPH so far. This spiked
our temperature to 49 degrees before falling and switching
around to the west.

All in all, a very changeable weather day here!

The high so far today is 49F degrees, this is 9 degrees
above the normal of 40F. The low since midnight is 40F,
18 degrees above the normal daily minimum of 22F.

Today’s Observations:

7 A.M.
Weather: Vertical visibility 300 ft, sky obscured, light rain
Temperature: 35F; Dew Point: 35F; Relative Humidity: 100%
Wind: ESE at 17G27 kts
Peak wind: 35 MPH (30 kts) ESE at 6:03 A.M.
Sea-level pressure: 29.30 ins. Hg: falling unsteadily
Visibility: 1/16 mile, fog
6-hr Max temp: 43F
6-hr Min temp: 40F
24-hr Precip:  0.58 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 W3 X 1/16R-F 923/35/35/1217G27/930/ R-CTD PK WND 1230/03/
8//// 57089 70058 10043 20040

10 A.M.
Weather: Overcast Stratus fractus, breaks in overcast NW-SW, rain
ending at 9:35 A.M.
Temperature: 46F; Dew Point: 46F; Relative Humidity: 100%
Wind: S at 23G33 kts
Peak wind: 38 MPH (33 kts) S at 9:38 A.M.
Sea-level pressure: 29.18 ins. Hg: falling, then falling more rapidly
Visibility: 30 miles, distant fog
3-hr Precip:  0.16 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E13 OVC 30 883/46/46/1823G33/918/ RE0935
FEW BINOVC DSNT NW-SW THN DSNT F ALQDS PK WND 1833/38/
8/7// 5/8040 60016

1 P.M.
Weather: Broken Stratocumulus
Temperature: 43F; Dew Point: 30F; Relative Humidity: 60%
Wind: W at 18G31 kts
Peak wind: 43 MPH (37 kts) W at 12:09 P.M.
Sea-level pressure: 29.24 ins. Hg: rising, then rising more rapidly
Visibility: 85 miles
6-hr Max temp: 49F
6-hr Min temp: 42F
6-hr Precip:  0.16 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 E41 BKN 85 903/43/30/2818G31/924/
VIRGA DSNT E AND SW PK WND 2837/09/ 8/400 5/3020
60016 10049 20042

SUMMARY FOR WEDNESDAY, FEBRUARY 26, 2020

TEMPERATURE (DEGREES F)
MAX…..45   NORMAL…..39
MIN…..39   NORMAL…..21
MEAN….42   NORMAL…..30

DEPARTURE FROM 30-YEAR NORMAL……………….+12
TOTAL DEPARTURE FOR THE MONTH………………+155 [+5.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………23  DEPARTURE…….-12
TOTAL HEATING UNITS FOR THE MONTH…………..812  DEPARTURE……-156
TOTAL HEATING UNITS FOR THE SEASON…………4041  DEPARTURE……-458
TOTAL HEATING UNITS LAST SEASON TO DATE…….4393  DEPARTURE……-352

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..23 ENE AT 11:52 P.M.
AERO…………………….24 E   AT 11:45 P.M.
ASOS…………………….25 ENE AT 11:52 P.M.
DAVIS……………………24 E   AT 11:31 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….18 ENE AT 11:53 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 ENE AT 11:48 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………19 E   AT 11:48 P.M.
AVERAGE WIND SPEED AND DIRECTION……………9.3 E
ASOS……………………9.4
DAVIS…………………..9.8 ENE [73 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.58  DEPARTURE……+0.42
ASOS…………..0.58
TOTAL PRECIPITATION FOR THE MONTH……….3.04  DEPARTURE……-0.70
ASOS…………..3.16
TOTAL PRECIPITATION FOR THE YEAR………..4.50  DEPARTURE……-3.59
ASOS…………..4.70

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.4
TOTAL SNOWFALL FOR THE MONTH…………….0.6  DEPARTURE……-12.3
TOTAL SNOWFALL FOR THE SEASON…………..24.8  DEPARTURE……-21.2

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

02/01  38/30/34/+8/0.01/T/…./..          14 WSW AERO 14 WSW RMY N/A
02/02  40/30/35/+9/0.00/0.0/…./..        18 W   AERO 18 WNW RMY 18
02/03  44/27/36/+10/0.00/0.0/…./..       28 W   AERO 28 W   RMY 28
02/04  44/33/39/+13/0.00/0.0/…./..       19 E   AERO 16 E   RMY 18
02/05  41/30/36/+10/0.00/0.0/…./..       20 NNW AERO 19 NNW RMY N/A
02/06  31/30/34/+8/0.00/0.0/…./..        29 E   AERO 28 E   RMY 27
02/07  53/25/39/+12/…./0.1/…./..       71 WSW AERO 71 SSW RMY 73
02/08  33/20/27/0/T/T/…./..              46 W   AERO 44 W   RMY 44
02/09  33/15/24/-3/T/T/…./..             30 SSE AERO 29 SSE RMY N/A
02/10  42/33/38/+11/…./0.0/…./..       39 SSW AERO 39 SSW RMY 39
02/11  40/36/38/+11/…./0.0/…./..       24 W   AERO 23 W   RMY N/A
02/12  41/30/36/+9/0.00/0.0/…./..        37 W   AERO 36 W   RMY N/A
02/13  35/31/34/+6/.00/0.0/…./..         29 SSW AERO 29 SSW RMY N/A
02/14  33/8/21/-7/0.00/0.0/…./..         32 WNW AERO 32 NW  RMY 34
02/15  27/4/16/-12/0.00/0.0/…./..        31 SSW AERO 31 SSW RMY N/A
02/16  40/23/32/+4/0.00/0.0/…./..        38 SW  AERO 38 SW  RMY N/A
02/17  44/28/36/+8/0.00/0.0/…./..        25 WNW AERO 24 WNW RMY 24
02/18  37/27/32/+3/0.31/T/…./..          26 SE  AERO 26 SE  RMY N/A
02/19  42/25/34/+5/0.00/0.0/…./..        45 W   AERO 46 W   RMY 44
02/20  31/18/25/-4/0.00/0.0/…./..        32 W   AERO 32 W   RMY N/A
02/21  30/11/21/-8/0.00/0.0/…./..        24 NNW AERO 21 N   RMY N/A
02/22  44/23/34/+5/0.00/0.0/…./..        26 W   AERO 24 W   RMY 27
02/23  53/30/42/+12/0.00/0.0/…./..       21 SW  AERO 22 WSW RMY 23
02/24  60/32/46/+16/0.00/0.0/…./..       29 S   AERO 29 SSW RMY 31
02/25  53/40/47/+17/…./0.0/…./..       17 NE  AERO 18 ENE RMY 17
02/26  45/39/42/+12/…/0.0/…./..        23 ENE AERO 24 E   RMY N/A

02/27 The low since midnight is 40F, daily normal minimum is 22F

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

RECORDS FOR FEBRUARY 27
HIGH 61F IN 1976
LOW -8F IN 1900
PRECIP 1.43 INCHES IN 2013
SNOWFALL 6.0 INCHES IN 1922
PEAK GUST 67 MPH W IN 1985

RECORDS FOR FEBRUARY 28
HIGH 62F IN 1976
LOW -2F IN 1907,1934
PRECIP 1.79 INCHES IN 1958
SNOWFALL 8.5 INCHES IN 2005
PEAK GUST 88e MPH SSW IN 1943

TODAY’S REPORT PREPARED BY: Andrew Swanson