BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, APRIL 24, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME
 
NARROW AXIS OF A HALF INCH OF RAINFALL LOCALLY
VERY COOL AND BECOMING WET WEATHER ON TUESDAY
NNE-NE WINDS GUST TO 35 MPH/9:48 P.M. & 1:19 A.M. 
EASTERN DAYLIGHT TIME
 
Rainfall was heavy over Cape Cod and the Islands yesterday
as a coastal low pressure moved northeastward just off
the Atlantic seaboard.  However rainfall totals tapered
way off just to the west and north.  A curious exception
was the half inch which fell along an east to west axis
from Hingham to Blue Hill where totals were close to half
an inch. However, only 0.08 inch fell at New Bedford,
0.26 at Plymouth, 0.13 at Norwood and Boston.
 
Over Cape Cod and the Islands rainfall totals were reported as
1.77 inches at Nantucket, 1.46 at Chatham, 1.69 at Hyannis,
and 1.56 inches at Marthas Vineyard. 
Here at Blue Hill NNE-NE winds gusted to 35 MPH last evening
and early today with temperatures stuck between 39 and 40F
during the period of rain and drizzle. 
 
Today's observations:
 
7 A.M.
Weather: Overcast stratus with higher ceiling SW-NW and with
stratus fractus drifting over the summit, very light drizzle
ended at 6:50 A.M. EST
Temperature: 42F; Dew Point: 42F; Wind: NNW at 15G26 kts,
Wind: Peak wind from NNW @ 26 kts @ 6:55 A.M. EST
Wind: Direction variable WNW-N
Sea-level pressure: 29.95 ins. Hg, falling slightly
Visibility: 6 miles thin fog, visibility increasing rapidly,
N-E 3 miles, SW-NW 20 miles
24-hr precip: 0.49 inch
6-hr precip: trace
6-hour min. temp: 41F
BHO SA 1155 E3 OVC 6F 141/42/42/3315G26/995/ FEW STRFRA DRFTG OVR 
SMT CIG HIER SW-NW VSBY INCRSNG RPDLY VSBY N-E 3 SW-NW 20 PK WND 
3326/54 WND 30V36 LE50/ 8/6// 58003 ASOS 70049 MANUAL 70049
10042 20041
 
10 A.M. 
Weather: Overcast stratocumulus, break in overcast/line of clearing
extending SW-NNW, numerous bright spots in overcast, few thin spots
in overcast
Temperature: 52F; Dew Point: 45F; Wind: W at 6 kts,
Wind: Light
Sea-level pressure: 29.94 ins. Hg, falling slightly
Visibility: 70 miles, except 80 miles NW
BHO SA 1455 E13 OVC 70 139/52/45/2806/994/ BINOVC/LINE OF
CLRG ALG HRZN DSNT SW-NNW NMRS BRGT SPTS FEW THN SPTS IOVC  
VSBY NW 80 WND LGT/ 8/5// 58002
 
1 P.M.
Weather: Clear, few cumulus fractus, cumulus, stratocumulus,
stratocumulus layer distant NE-SE, dense cirrus layer distant NNE-ESE 
Temperature: 64F; Dew Point: 48F; Wind: WSW at 6 kts,
Wind: Light
Sea-level pressure: 29.89 ins. Hg, falling then more rapidly
Visibility: 75 miles, light distant haze
6-hour max temp: 66F
BHO SA 1755 CLR 75 121/64/48/2406/989/ FEW CUFRA/CU/SC
SC LYR DSNT NE-SE DNS CI LYR DSNT NNE-ESE LGT DSNT HZ
WND LGT/ 8/802 58018 10066 20042
 
WEATHER SUMMARY FOR TUESDAY, APRIL 23
 
TEMPERATURE (DEGREES F)
MAX.....40     NORMAL.....59
MIN.....38     NORMAL.....41                         
MEAN....39     NORMAL.....50             
 
DEPARTURE FROM 30-YEAR NORMAL...................-11
TOTAL DEPARTURE FOR THE MONTH...................+31 [+1.2 DEGREES/DAY]
 
HEATING DEGREE DAYS 
TOTAL HEATING UNITS FOR YESTERDAY............26   DEPARTURE.........+11
TOTAL HEATING UNITS FOR THE MONTH...........406   DEPARTURE.........-21
TOTAL HEATING UNITS FOR THE SEASON.........5452   DEPARTURE........-484
TOTAL HEATING UNITS LAST SEASON TO DATE....4597   DIFFERENCE.......+855
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...............35 NNE AT  8:48 P.M.
                   AERO....................30 NNE AT  8:48 P.M.
                   ASOS....................33 NNE AT  8:49 P.M.
                   DAVIS...................32 NNE AT  8:48 P.M. RMY: 35
THE FASTEST MILE FOR YESTERDAY.............22 N   AT 11:47 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE..............21 N   AT 11:51 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.............21 NE  AT  2:36 P.M.
AVERAGE WIND SPEED AND DIRECTION.........15.1 NE           
                   ASOS..................14.8
                   DAVIS.................13.3 NE [040 deg]
*last of several occurrences.
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.49  DEPARTURE...........+0.35
                         ASOS..............0.49
TOTAL PRECIPITATION FOR THE MONTH..........2.24  DEPARTURE...........-1.38
                         ASOS..............2.19
TOTAL PRECIPITATION FOR THE YEAR..........16.33  DEPARTURE...........-1.29
                         ASOS..............N/A*
*ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals
                       
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M.........0.0   DEPARTURE............ 0.0
TOTAL SNOWFALL FOR THE MONTH.............Trace   DEPARTURE............-2.8
TOTAL SNOWFALL FOR THE SEASON.............99.0   DEPARTURE...........+36.5
 
PRELIMINARY CLIMATE SUMMARY FOR APRIL 2013 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
4/1  61/31/46/+5/0.34/0.0/458/60     40 W   AERO 44 MPH WNW RMY 46  TSTM
4/2  40/27/34/-7/T/T/460/60          45 W   AERO 42 MPH W   RMY 47
4/3  45/27/36/-6/0.00/0.0/755/98     44 W   AERO 43 MPH W   RMY 47
4/4  55/26/41/-1/0.00/0.0/719/93     30 WSW AERO 27 MPH WSW RMY 31
4/5  59/36/48/+5/0.00/0.0/403/52     33 NNW AERO 28 MPH NNW RMY 38
4/6  47/30/39/-4/0.00/0.0/747/96     38 NW  AERO 35 MPH NW  RMY 40 
4/7  52/31/42/-1/0.00/0.0/391/50     51 S   AERO 46 MPH S   RMY 50
4/8  65/43/54/+10/T/0.0/494/63       29 SSW AERO 22 MPH SSW RMY N/A
4/9  72/44/58/+14/T/0.0/456/58       35 WNW AERO 35 MPH WNW RMY 39  TSTM
4/10 64/43/54/+9/0.13/0.0/426/54     23 SE  AERO 20 MPH SE  RMY 25
4/11 52/40/46/+1/0.09/0.0/063/08     18 ENE AERO 14 MPH ENE RMY N/A
4/12 40/34/37/-8/0.58/T/000/00       38 E   AERO 32 MPH E   RMY 41
4/13 52/34/43/-3/0.04/0.0/128/16     31 NNE AERO 27 MPH NNE RMY 21
4/14 52/36/44/-2/0.00/0.0/216/27     31 WNW AERO 27 MPH WNW RMY 32
4/15 55/35/45/-2/0.00/0.0/514/64     21 ESE AERO 15 MPH S   RMY N/A
4/16 62/38/50/+3/T/0.0/540/67        44 S   AERO 40 MPH S   RMY 45
4/17 67/48/58/+11/T/0.0/769/95       29 SSW AERO 25 MPH SSW RMY N/A
4/18 65/43/54/+6/0.00/0.0/503/62     30 S   AERO 25 MPH S   RMY N/A
4/19 72/50/61/+13/0.07/0.0/195/24    47 SSW AERO 48 MPH SSW RMY 50
4/20 62/39/51/+2/0.48/0.0/147/18     43 SSW AERO 41 MPH SSW RMY N/A
4/21 53/31/42/-7/0.00/0.0/819/100    31 WNW AERO 25 MPH WNW RMY N/A
4/22 49/35/42/-7/..../0.0/.../..     32 E   AERO 28 MPH E   RMY 33
4/23 40/38/39/-11/..../0.0./000/00   35 NNE AERO 30 MPH NNE RMY 35
 
4/24 morning low temp: 40F; the normal low is now 41F
 
DAILY RECORDS FOR APRIL 2013
None so far.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR APRIL 24
HIGH 82 IN 2001
LOW 22 IN 1930
PRECIP 2.51 INS IN 1898
SNOWFALL 1.2 INS IN 1967
PEAK GUST 59 MPH NW IN 1962
 
RECORDS FOR APRIL 25
HIGH 83 IN 2009
LOW 24 IN 1892
PRECIP 1.38 IN. IN 1901
SNOWFALL 0.7 IN. IN 2002.
PEAK GUST 66 MPH SE IN 1968
 
TODAY'S REPORT PREPARED BY: Robert Skilling