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Thursday, May 3, 2018

May 3, 2018

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, MAY…

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MAY 3, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

ANOTHER DAY OF CLOSE TO RECORD BREAKING HIGH
TEMPERATURES…

Temperatures continued to be close to record breaking
after yesterday’s high max of 88F. The record for both
today and yesterday is 92F set during an early season
heat wave back in 2001. Today we reached a max so far
of 90F, this is 27 degrees above the daily normal of
63F. Yesterday’s low temperature of 58F was 4 degrees
below the record for high minimum of 62F also set in
2001. So far, since midnight, we have a record breaking
minimum temperature of 67F, but this record will not
be set if temperatures drop down below 66F before
midnight.
The wind has been mostly from the SW and picked up
yesterday afternoon making for a breezy day today with
frequent gust over 30 MPH this afternoon. Heavy rain
shower began after our scheduled observations around
2:30 P.M. EST and ended just before 3:00 P.M. EST.
The sky had a mixture of clouds increasing as pressure
began to drop. Visibility continued to be obscured by
a distant haze limiting visibility to 40 miles at each
observation.

PRELIMINARY STATS FOR APRIL 2018

TEMPERATURE, Deg. F
Avg. Max. 52.4 [-3.3] Avg. Min. 34.9 [-2.8] Mean      43.7 [-3.0] 24-hour corrected mean: 43.1
Max. for month:  73F on 28th
Min. for month:  24F on  9th

HEATING DEGREE DAYS
Total heating units:    635  [+84] Total for the season:  5693 [-342] Total for last season: 5333

PRECIPITATION, Inches
Total: 6.50 [+1.95] Greatest in 24 hrs: 2.85 on the 15-16th

SNOWFALL, Inches
Total: 2.6 [-0.4] Greatest in 24 hrs: 1.6 in. on 2nd

WIND, mph
Avg. uncorrected wind speed: 12.2
Avg. corrected wind speed: 12.6
Prevailing wind direction: WNW at 16%
Peak gust and direction: 56 NW on the 2nd

SUNSHINE:
Campbell-Stokes card minutes:N/A
Astronomical total minutes: N/A

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, broken altostratus
Temperature: 71F; Dew Point: 46F; Wind: SW at 10G16 kts
Sea-level pressure: 29.97 ins. Hg, rising, then more slowly
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 71F
6-hr Min temp: 67F
24-hr precip:  0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 130 SCT 200 BKN 40 150/71/46/2210G16/997/
DSNT HZ ALQDS SUN DMLY VSBL/ 8/010 51013 10071 20067

10 A.M.
Weather: Scattered cirrostratus
Temperature: 86F; Dew Point: 53F; Wind: SW at 9G16 kts
Sea-level pressure: 29.95 ins. Hg, falling, then more rapidly
Visibility: 40 miles, distant haze in all directions
3-hr precip: 0.00 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 250 SCT 40 142/86/53/2209G16/995/ DSNT HZ ALQDS/
8/008 58008

1 P.M.
Weather: Scattered cirrostratus
Temperature: 89F; Dew Point: 53F; Wind: SW at 18G30 kts
Sea-level pressure: 29.87 ins. Hg, falling, then more rapidly
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 90F
6-hr Min temp: 71F
6-hr precip:   0.00 ins
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 50 SCT 90 SCT E160 BKN 40 114/89/53/2218G30/987/
DSNT HZ ALQDS PK WND 2230/54/ 8/210 58028 10090 20071

SUMMARY FOR WEDNESDAY, MAY 2, 2018

TEMPERATURE (DEGREES F)
MAX…..88   NORMAL…..62
MIN…..59   NORMAL…..44
MEAN….74   NORMAL…..53

DEPARTURE FROM 30-YEAR NORMAL…………………….+21
TOTAL DEPARTURE FOR THE MONTH…………………….+20 [+9.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..0   DEPARTURE………-12
TOTAL HEATING UNITS FOR THE MONTH………….13   DEPARTURE………..0
TOTAL HEATING UNITS FOR THE SEASON……….5706   DEPARTURE……..-354
TOTAL HEATING UNITS LAST SEASON TO DATE…..5351   DIFFERENCE…….+344

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………9   DEPARTURE……….-9
TOTAL COOLING UNITS FOR THE MONTH……………9   DEPARTURE……….+9
TOTAL COOLING UNITS FOR THE SEASON…………..9   DEPARTURE……….+7
TOTAL COOLING UNITS LAST SEASON TO DATE……..20   DEPARTURE………-11

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….37 WSW AT 4:11 P.M.*
AERO……………………29 SW  AT 3:32 P.M.
ASOS……………………35 NW  AT 4:11 P.M.
DAVIS…………………..40 M   AT 4:11 P.M.** RMY 35
FASTEST MILE FOR YESTERDAY…………………25 WSW AT 1:31 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………24 SW  AT 1:32 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..26 M   AT 4:47 P.M.**
AVERAGE WIND SPEED AND DIRECTION………….16.0 WSW
ASOS………………….15.9
DAVIS…………………15.5 M**
*  Last of multiple occurrences
** Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.12
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.37  DEPARTURE……+0.13
ASOS…………..0.36
TOTAL PRECIPITATION FOR THE YEAR……….25.30  DEPARTURE……+6.67
ASOS………….26.92

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE………0.0
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE………0.0
TOTAL SNOWFALL FOR THE SEASON…………..92.8  DEPARTURE…….+30.0

PRELIMINARY CLIMATE SUMMARY FOR APRIL 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
*   : Estimated data

4/01 58/33/46/+5/0.00/0.0/336/44   45 SSW AERO 43 SSW RMY N/A
4/02 38/30/34/-7/0.13/1.6/077/10   20 SSW AERO 15 SSW RMY 17
4/03 48/30/39/-3/0.54/0.0/238/31   28 SSE AERO 25 SSE RMY 25
4/04 54/36/45/+3/0.21/0.0/000/00   56 WNW AERO 56 WNW RMY 54
4/05 40/27/34/-9/0.00/0.0/760/98   53 WNW AERO 53 WNW RMY 52
4/06 41/25/33/-10/0.25/1.0/156/20  37 S   AERO 36 S   RMY 38
4/07 46/32/35/-4/0.00/0.0/312/40   32 WNW*AERO 35 WNW RMY 34
4/08 41/29/35/-9/0.00/0.0/290/37   35 WNW*AERO 31 WNW RMY 34
4/09 45/24/35/-9/0.00/0.0/715/01   28 WNW AERO 25 WNW RMY 29
4/10 39/31/35/-10/T/T/000/00       14 SSW AERO 13 SSW RMY N/A
4/11 48/29/39/-6/T/0.0/364/46      24 SSE AERO 23 SSE RMY 25
4/12 61/33/47/+2/0.03/0.0/500/63   39 SSW AERO 38 SSW RMY 41
4/13 65/47/56/+10/T/0.0/096/12     37 SSW AERO 37 SSW RMY N/A
4/14 51/36/44/-2/0.00/0.0/328/41   33 ENE AERO 31 ENE RMY N/A
4/15 36/30/33/-14/0.32/T/000/00    39 ENE AERO 39 ENE RMY N/A
4/16 55/32/44/-3/2.63/000/00       41 ENE AERO 43 ENE RMY 41
4/17 48/36/42/-5/0.00/0.0/210/26   37 W   AERO 33 W   RMY 37
4/18 53/32/43/-5/0.00/0.0/633/78   35 W   AERO 31 W   RMY 34
4/19 41/34/38/-10/0.22/T/000/00    28 WNW AERO 25 WNW RMY N/A
4/20 52/31/42/-7/0.00/0.0/522/64   34 NW  AERO 33 NW  RMY 36
4/21 60/33/47/-2/0.00/0.0/811/99   28 NW  AERO 26 NW  RMY 29
4/22 61/36/49/0/0.00/0.0/821/100   25 NW  AERO 24 NW  RMY 26
4/23 62/40/51/+1/0.00/0.0/816/99   25 S   AERO 25 S   RMY 26
4/24 67/39/53/+3/0.00/0.0/645/78   31 S   AERO 29 S   RMY 32
4/25 57/47/52/+2/…./0.0/000/00   32 SE  AERO 32 SE  RMY 33
4/26 66/48/57/+6/…./0.0/308/37   36 WNW AERO 35 WNW RMY 37
4/27 60/45/53/+2/…./0.0/…/..   18 W   AERO 15 W   RMY N/A
4/28 73/47/60/+8/0.00/0.0/…/..   25 S   AERO 21 S   RMY 25
4/29 59/38/49/-3/0.04/0.0/…/..   32 SW  AERO 26 SW  RMY 31
4/30 46/36/41/-11/0.37/0.0/…/..  23 WSW AERO 16 WSW RMY N/A

DAILY RECORDS FOR APRIL 2018

4/16/18: NEW DAILY RECORD MAXIMUM PRECIPITATION OF 2.63 INS.
PREVIOUS RECORD WAS 2.45 INS. SET IN 1929

PRELIMINARY CLIMATE SUMMARY FOR MAY 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

5/1 65/39/52/-1/0.00/0.0/…/..    25 WNW AERO 21 WNW RMY 25
5/2 88/59/74/+21/0.00/0.0/…/..   37 WSW AERO 29 WSW RMY 35

5/3  Low temp since midnight is 67F; normal low is now 44F

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

RECORDS FOR MAY 3
HIGH 92F IN 2001
LOW 31F IN 1888
PRECIP 2.25 INS IN 1900
SNOWFALL TRACE IN 1908, 1985
PEAK GUST 71 MPH W IN 2002

RECORDS FOR MAY 4
HIGH 90F IN 2001
LOW 27F IN 1911 (RECORD FOR MAY)
PRECIP 1.92 INCHES IN 1893
SNOWFALL 0.1 INCHES IN 1920
PEAK GUST 60 MPH NW IN 1966

TODAY’S REPORT PREPARED BY: Kaitlin Geagan

 

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Blue Hill Observatory & Science Center · Legal

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