Wednesday, May 2, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 2, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

SUNNY AND DRY DAY WITH CLOSE TO RECORD BREAKING
TEMPERATURES…

Yesterday temperatures were more seasonable with an
average that was -1 degree below the daily normal.
Temperatures have been quickly on the rise today with
a near record breaking max so far of 87F. The record
of 92F was set back in 2001. Since midnight we have
had a low of 59F, which is 3 degrees below the record
high minimum of 62F. This record was also set in 2001.
Although we had very low humidity today, visibility was
limited to 40 miles all day due to a lingering distant
haze in the area.

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 cirrostratus
Temperature: 67F; Dew Point: 36F; Wind: WSW at 9G19 kts
Sea-level pressure: 30.02 ins. Hg, rising steadily
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 67F
6-hr Min temp: 59F
24-hr precip:  0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 250 SCT 40 165/67/36/2509G19/002/ DSNT HZ
ALQDS/ 8/006 52012 10067 20059

10 A.M.
Weather: Scattered cirrostratus
Temperature: 82F; Dew Point: 39F; Wind: W at 14G25 kts
Sea-level pressure: 30.00 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 40 160/82/39/2714G25/000/ DSNT HZ
ALQDS/ 8/006 58002

1 P.M.
Weather: Scattered cirrostratus
Temperature: 87F; Dew Point: 40F; Wind: SW at 17G27 kts
Sea-level pressure: 29.95 ins. Hg, falling unsteadily
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 87F
6-hr Min temp: 66F
6-hr precip:   0.00 ins
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 250 SCT 40 142/87/40/2317G27/995/ DSNT HZ
ALQDS PK WND 2327/48/ 8/005 58018 10087 20066

SUMMARY FOR TUESDAY, MAY 1, 2018

TEMPERATURE (DEGREES F)
MAX…..65   NORMAL…..62
MIN…..39   NORMAL…..43
MEAN….52   NORMAL…..53

DEPARTURE FROM 30-YEAR NORMAL……………………..-1
TOTAL DEPARTURE FOR THE MONTH……………………..-1 [-1.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….13   DEPARTURE……….+1
TOTAL HEATING UNITS FOR THE MONTH………….13   DEPARTURE………..0
TOTAL HEATING UNITS FOR THE SEASON……….5706   DEPARTURE……..-341
TOTAL HEATING UNITS LAST SEASON TO DATE…..5351   DIFFERENCE…….+355

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….25 WNW AT  2:46 P.M.*
AERO……………………21 WNW AT  2:46 P.M.*
ASOS……………………25 NW  AT  2:46 P.M.
DAVIS…………………..24 M   AT  1:50 P.M.** RMY N/A
FASTEST MILE FOR YESTERDAY…………………16 WNW AT  2:52 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………16 SW  AT 11:16 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..16 M   AT  1:51 P.M.**
AVERAGE WIND SPEED AND DIRECTION…………..8.9 NW
ASOS…………………..8.4
DAVIS………………….8.3 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……+0.25
ASOS…………..0.36
TOTAL PRECIPITATION FOR THE YEAR……….25.30  DEPARTURE……+6.78
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

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  Low temp since midnight is 39F; normal low is now 43F

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

RECORDS FOR MAY 2
HIGH 92F IN 2001
LOW 29F IN 1903
PRECIP 1.36 INCHES IN 2006
SNOWFALL 1.0 INS IN 1888
PEAK GUST 58 MPH S IN 1983

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

TODAY’S REPORT PREPARED BY: Kaitlin Geagan