Saturday, February 24, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, FEBRUARY 24, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

PARTIAL SUNSHINE THIS MORNING…CLOUDS ADVANCE
BY EARLY AFTERNOON WITH LIGHT SHOWERS AFTER 2 PM

The sky was partly cloudy at sunrise today with a
complex mixture of altocumulus, cirrocumulus and
cirrus, and a faint sun pillar was observed for a
short time around sunrise. The sky cleared for a
while at mid-morning, then an overcast of altocumulus
and altostratus moved in by early afternoon.
A light rain show arrived at 2:15 PM and dropped a
trace of precipitation before ending at 2:35 PM.
The visibility has increased throughout the day
reaching 75 miles by 1 PM.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, scattered cirrocumulus,
thin broken cirrus, cirrocumulus overhead-NE-SW, light
distant haze, sun pillar observed in the past hour
Temperature: 41F; Dew Point: 39F; Wind: W at 18 kts
Sea-level pressure: 30.08 ins. Hg, rising then falling
Visibility: 55 miles, visibility NW 45
6-hr Max temp: 41F
6-hr Min temp: 36F
24-hr precip:  0.20 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 140 SCT 200 SCT 250 –BKN 55 186/41/39/2718/008/
CC OVHD-NE-SE LGT DSNT HZ VSBY NW 45 SUN PILLAR PST HR PK WND
2728/42/ 8/039 51011 70020 10041 20036

10 A.M.
Weather: Clear, few cumulus WNW-NE and SSE-S, few cirrus SSE-S
Temperature: 49F; Dew Point: 38F; Wind: WNW at 10G24 kts,
Sea-level pressure: 30.10 ins. Hg, rising then steady
Visibility: 70 miles
3-hr precip: 0.00
3-hr snowfall: 0.0 ins.
BHO SA 1455 CLR 70 193/49/38/3010G24/010/ FEW CU WNW-NE AND
SSE-S FEW CI SSE-S/ 8/101 51007

1 P.M.
Weather: Broken altocumulus, overcast altostratus
Temperature: 51F; Dew Point: 36F; Wind: WNW at 10G20 kts,
Sea-level pressure: 30.11 ins. Hg, falling, rising slightly
Visibility: 75 miles
6-hr Max temp: 53F
6-hr Min temp: 41F
6-hr precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 E100 BKN 140 OVC 75 196/51/36/2910G20/011/ FEW CU
DSNT NW-NNE HIR CLDS VSBL DSNT WNW-NNE BINOVC DSNT SSE-S AND N
SUN DMLY VSBL/ 8/171/ 51003 10053 20041
SUMMARY FOR FRIDAY, FEBRUARY 23, 2018

TEMPERATURE (DEGREES F)
MAX…..41   NORMAL…..39
MIN…..28   NORMAL…..21
MEAN….35   NORMAL…..30

DEPARTURE FROM 30-YEAR NORMAL……………………….+5
TOTAL DEPARTURE FOR THE MONTH……………………..+175 [+7.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….30   DEPARTURE……….-5
TOTAL HEATING UNITS FOR THE MONTH…………687   DEPARTURE……..-177
TOTAL HEATING UNITS FOR THE SEASON……….4008   DEPARTURE……..-386
TOTAL HEATING UNITS LAST SEASON TO DATE…..3781   DIFFERENCE…….+219

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23 SW AT 11:57 P.M.
AERO……………………20 SW AT 11:54 P.M.
ASOS……………………22 SW AT 11:57 P.M.
DAVIS………………….. M M              ** RMY N/A
FASTEST MILE FOR YESTERDAY…………………16 SW AT 11:58 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE………………17 SW AT 11:59 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………M M              **
AVERAGE WIND SPEED AND DIRECTION…………..8.2 SSE
ASOS…………………..8.2
DAVIS……………………M **
*Last of multiple occurrences
** Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.20  DEPARTURE……+0.04
ASOS…………..0.19
TOTAL PRECIPITATION FOR THE MONTH……….3.55  DEPARTURE……+0.29
ASOS…………..3.68
TOTAL PRECIPITATION FOR THE YEAR………..9.55  DEPARTURE……+1.94
ASOS………….10.26

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.5
TOTAL SNOWFALL FOR THE MONTH……………10.2  DEPARTURE……..-1.3
TOTAL SNOWFALL FOR THE SEASON…………..44.7  DEPARTURE………0.0

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/…./0.0/120/20      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 42/29/35/+6/…./…/…/..       32 WNW AERO 29 WNW RMY 34
2/19 48/30/39/+10/…./0.0/…/..      39 SSW AERO 37 SSW RMY 40
2/20 68/48/58/+29/…./0.0/…/..      32 SSW AERO 30 SSW RMY N/A
2/21 70/50/60/+31/0.00/0.0/…/..      32 SW  AERO 30 SW  RMY 33
2/22 53/30/42/+13/…./0.8/…/..      30 N   AERO 28 N   RMY N/A
2/23 41/28/35/+5/0.20/0.0/…/..       34 SW  AERO 20 SW  RMY N/A

2/24 Low temp since midnight is 35F; normal low is now 30F

DAILY RECORDS FOR FEBRUARY 2018

2/20/18: NEW DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 68F
PREVIOUS RECORD WAS 66F SET IN 1930
2/21/18: NEW DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 70F
PREVIOUS RECORD WAS 62F SET IN 1930
2/21/18: NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 50F
PREVIOUS RECORD WAS 45F SET IN 2002

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

RECORDS FOR FEBRUARY 24
HIGH 71F IN 2017
LOW -11F IN 1894
PRECIP 3.10 INCHES IN 1969
SNOWFALL 27.4 INCHES IN 1969 [HIGHEST CALENDAR DAY AMOUNT ON RECORD] PEAK GUST 63 MPH NE IN 1998

RECORDS FOR FEBRUARY 25
HIGH 68F IN 2017
LOW -10F IN 1894
PRECIP 2.40 INCHES IN 1981
SNOWFALL 13.6 INCHES IN 1966
PEAK GUST 76 MPH S IN 2016

TODAY’S REPORT PREPARED BY: Mike Iacono / Ben Turner