BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, MAY 15, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
WARM AIR ARRIVES AFTER VERY LIGHT MORNING SHOWERS
 
The morning showers left only a trace of rain and as 
the clouds were clearing and the sun coming out early
this afternoon temperatures were rising very quickly at
a rate of 8 degrees per hour into the middle 70's shortly 
after 2 p.m. EDT.  S-SSW winds were not all that gusty, 
at least early this afternoon, with gusts generally only 
around 25 MPH even here at the summit.  
 
Today's observations:
 
7 A.M.   
Weather: Overcast 
Temperature: 51F, Dew point: 27F, Wind: S at 18G24 kts  
Sea-level pressure: 29.96 inches Hg, falling
Visibility: 25 miles, W-NE 20, SE-SW 30 
6-hourly min. temp. 50F
6-houry rainfall: trace 
BHO SA 1155 80 SCT E100 OVC 25 147/53/41/1918G24/996/ 
FEW ACSL RW20 W-NE MOVG ESE VSBY W-NE 20 SE-SW 30 VIRGA RE05/ 
8/07/ 58018 MANUAL 6000/ 10053 20050 
  
10 A.M.
Weather: Overcast with very light rain showers
Temperature: 58F, Dew point: 46F, Wind: SSW at 16G22 kts 
Sea-level pressure: 29.88 inches Hg, falling   
Visibility: 30 miles, 20 NE-SE and SW    
3-hourly rainfall: trace 
BHO SA 1455 E85 OVC 30RW- 120/58/46/2016G22/988/ RBUKN VRY LGT
VSBY NE-SE 20 SW 20 WNW 45/ 8/07/ 58027 MANUAL 6000/ 
  
1 P.M.
Weather: Broken middle and high clouds, chaotic sky,
sky clearing from SW-NW hazy   
Temperature: 73F, Dew point: 48F, Wind: S at 16G21 kts 
Sea-level pressure: 29.78 inches Hg, falling   
Visibility: 25 miles hazy    
Six hourly max. temp: 73 deg.
Six hourly rainfall: trace 
BHO SA 1755 120 SCT 200 SCT 250 –BKN 300 –OVC 25 086/73/48/1916G21/978/ 
AC CHAOTIC DENSE CI PRSNT BINOVC/LINE OF CLRG SW-NW HAZY/ 8/092 MANUAL
56034 MANUAL 6000/ 10073 20053 
 
WEATHER SUMMARY FOR MONDAY, MAY 14 
 
TEMPERATURE (DEGREES F)
MAX.....73    NORMAL.....67 
MIN.....43    NORMAL.....46
MEAN....58    NORMAL.....57
DEPARTURE FROM 30-YEAR NORMAL...........+1
TOTAL DEPARTURE FOR THE MONTH..........+57 (+3.9 DEGREES/DAY)
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY........... 7  DEPARTURE........- 2
TOTAL HEATING UNITS FOR THE MONTH..........109  DEPARTURE........-43 
TOTAL HEATING UNITS FOR THE SEASON........5725  DEPARTURE.......-457
TOTAL HEATING UNITS LAST SEASON TO DATE...5606  DIFFERENCE......+119
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............30 SSW  AT  7:26 P.M. *  
                   AEROVANE.............30 SSW  AT  7:15 P.M. * 
                   ASOS.................31 SSW  AT  7:15 P.M.  
                   DAVIS................37  SW  AT  7:14 P.M. 
FASTEST MILE FOR YESTERDAY..............24 SSW  AT  7:16 P.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE...........24 SSW  AT  7:15 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE..........28 SSW  AT  7:15 P.M.  
AVERAGE WIND SPEED AND DIRECTION.......12.2 W   
ASOS FOR THE DAY.......................12.6                    
DAVIS FOR THE DAY .....................12.5 W [260 degrees]
* last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....trace  DEPARTURE....-0.12
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........0.10   DEPARTURE....-1.63 
                         ASOS..............0.08    
TOTAL PRECIPITATION FOR THE YEAR..........20.52   DEPARTURE....+0.84
                         ASOS.............20.05    
 
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......-0.1 
TOTAL SNOWFALL FOR THE SEASON..............27.6  DEPARTURE.....-32.5  
    
PRELIMINARY CLIMATE SUMMARY FOR MAY 2007......CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
 
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available
 
5/1  67/44/56/+4/0/0/624/74      33 NW 
5/2  64/45/55/+3/0.06/0/381/45   36 NW    Aero 33 MPH WNW
5/3  67/42/55/+2/0/0/849/100     38 W     Aero 37 MPH W
5/4  66/44/55/+2/0/0/842/99      39 WNW   Aero 40 MPH WNW 
5/5  65/45/55/+2/0/0/384/45      33 N  
5/6  51/42/47/-7/T/0/514/60      36 N     Aero 33 MPH N 
5/7  68/39/54/0/0/0/798/93       25 S
5/8  77/43/60/+6/0/0/851/99      33 S     Aero 31 MPH S 
5/9  85/54/70/+15/0/0/707/92     30 S 
5/10 85/60/73/+18/0/0/692/80     29 S     Aero 27 MPH S
5/11 74/60/67/+12/0.02/0/355/41  23 S
5/12 63/47/55/-1/0.02/0/.../..   32 NE    
5/13 65/46/56/0/T/0/775/89       33 WNW   Aero 33 MPH WNW 
5/14 73/43/58/+1/0/0/822/94      30 SSW
 
5/15 morning low temperature 50 deg; normal now 47 deg.   
     a trace of rain..
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 15
HIGH 93F IN 1900
LOW 36F IN 1947,1985
PRECIP 1.63 INCHES IN 1978
PEAK GUST 53e MPH NE IN 1978, W 2002
 
RECORDS FOR MAY 16
HIGH 90F IN 1951
LOW 30F IN 1936
PRECIP 2.63 INCHES IN 1954
PEAK GUST 56e MPH NW IN 1952
 
TODAY'S REPORT PREPARED By: Robert Skilling