BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, APRIL 19, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
SUN RETURNS AFTER NEARLY ONE WEEK OF CLOUDS AND RAIN
 
The first bright sunshine occurred this morning at just 
a few minutes after 8:00 A.M.  The last bright sunshine
we saw occurred last Saturday April 14 at about 3:15 P.M.

Today's observations:
 
7 A.M.   
Weather: Low overcast, light rain and sleet, fog  
Temperature: 36F, Dew point: 35F, Wind: NNW at 15G27 kts
Wind: Peak wind 27 kts Nnw at 54 past the hour 
Wind: Variable in direction NW to NE
Sea-level pressure: 29.92 ins. Hg, rising
Visibility: 6 miles, rain and fog  
6-hour min. 36 deg. 
24-hour rainfall: 0.27 in.
24-hour snowfall: trace   
BHO SA 1155 E13 BKN 18 OVC 6RW-IP-F 133/36/35/3515G27/992/ 
PK WND 3527/54 WND 31V04/ 8/72/ 51014 MANUAL 600X/ ASOS 60001 
MANUAL 70027 ASOS 70027 10037 20036
 
10 A.M.
Weather: Broken clouds   
Temperature: 44F, Dew point: 25F, Wind: NNE at 17G26 kts
Wind: Peak wind N @ 28 kts at 01 past the hour
Wind: Variable in direction NNW to ENE 
Sea-level pressure: 29.94 inches Hg, rising 
Visibility: 50 miles, higher NW
BHO SA 1455 E250 BKN 50 139/44/25/0217G26/994/ FEW SCSL SW
FEW DSNT SC ALQDS VSBY NW 65 PK WND 3628/01 WND 34V07/ 8/501 53006
 
1 P.M.
Weather: Thin broken clouds
Temperature: 48F, Dew point: 22F, Wind: NNE at 18G25 kts
Wind: Peak wind Nne @ 33 kts at 26 past the hour
Sea-level pressure: 29.94 inches Hg, steady
Visibility: 70 miles
6-hourly rainfall: trace
6-hourly min. temp. 36 deg.   
BHO SA 1755 70 SCT 250 SCT 70 139/48/22/0218G25/994/ PK WND 0333/26 
WND 35V08/ 8/501 55000 MANUAL 6000/ 10049 20036
 
WEATHER SUMMARY FOR WEDNESDAY, APRIL 18
 
TEMPERATURE (DEGREES F)
MAX.....39    NORMAL.....56 
MIN.....36    NORMAL.....38
MEAN....38    NORMAL.....47
 
DEPARTURE FROM 30-YEAR NORMAL...........-9
TOTAL DEPARTURE FOR THE MONTH.........-112 (-6.4 DEGREES/DAY) 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY..........27   DEPARTURE.........+9
TOTAL HEATING UNITS FOR THE MONTH.........459   DEPARTURE.......+112 
TOTAL HEATING UNITS FOR THE SEASON.......5480   DEPARTURE.......-359
TOTAL HEATING UNITS LAST SEASON TO DATE..5226   DIFFERENCE......+254
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............43 N   AT  1:24 A.M.   
                   AEROVANE.............Unknown
                   ASOS.................39 N   AT 12:17 A.M.  
                   DAVIS................Unknown
FASTEST MILE FOR YESTERDAY..............28 N   AT 12:08 A.M.      
MAXIMUM 2-MINUTE ASOS AVERAGE...........28 N   AT  2:08 P.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE..........Unknown  
AVERAGE WIND SPEED AND DIRECTION......  17.4 N 
                    ASOS................16.8  
                    DAVIS...............17.2 NNE [020 deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.27  DEPARTURE.....+0.13
                         ASOS..............0.27
TOTAL PRECIPITATION FOR THE MONTH..........7.18  DEPARTURE.....+4.50  
                         ASOS..............6.85    
TOTAL PRECIPITATION FOR THE YEAR..........18.92  DEPARTURE.....+2.61
                         ASOS.............18.49   
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M........trace  DEPARTURE......-0.1
TOTAL SNOWFALL FOR THE MONTH................0.2  DEPARTURE......-1.7 
TOTAL SNOWFALL FOR THE SEASON..............27.6  DEPARTURE.....-31.2  
    
PRELIMINARY CLIMATE SUMMARY FOR APRIL 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
 
4/1  59/33/46/+5/0.42/0/511/67       30 S
4/2  39/35/37/-5/0.33/0/000/00       27 E
4/3  41/32/37/-5/0.04/0/000/00       28 ENE
4/4  36/32/34/-8/0.90/0.2/000/00     38 E
4/5  43/26/35/-8/0.21/T/163/21       36 WSW
4/6  39/23/31/-12/0/0/590/76         36 WSW
4/7  40/26/33/-10/0/0/405/52         35 W
4/8  40/25/33/-11/0/0/619/79         44 W      Aero 42 MPH W
4/9  50/30/40/-4/0/0/746/95          36 W
4/10 43/30/37/-7/0/0/158/20          28 W 
4/11 51/28/40/-5/0/0/.../..          22 SSE
4/12 39/32/36/-9/0.89/T/000/00       42 E      Aero 40 MPH E
4/13 47/31/39/-6/0/0/.../..          41 W      Aero 42 MPH W
4/14 52/35/44/-2/0/0/.../..          37 W
4/15 44/35/40/-6/1.75/T/000/00       66 E      Aero 64 MPH E  
4/16 50/40/45/-1/1.56/0/000/00       73 E      Aero 73 MPH E 
4/17 40/35/38/-9/.../T/000/00        54 NNE
4/18 39/36/38/-9/.../T/000/00        43 N
 
4/19 morning low temp. 36 deg; normal now 38 deg.
 
NEW DAILY RECORDS FOR APRIL SO FAR....
 
4/15 - NEW RECORD HIGH PEAK WIND GUST FOR THIS DATE OF 66 MPH E; the previous   
record was 59 mph estimated from the S in 1946 and measured from the S in 1980.   
NEW RECORD DAILY RAINFALL OF 1.75 INS.; previous record 1.29 ins. in 1990.
 
4/16 - NEW RECORD HIGH PEAK WIND GUST OF 73 MPH E; the previous record for this  
date was 63 mph SSE in 1996.       
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR APRIL 19
HIGH 94 IN 1976 [RECORD FOR MONTH]
LOW  21 IN 1890
PRECIP 1.71 IN 1969
SNOWFALL 6.0 IN. IN 1887
PEAK GUST 66 MPH E IN 1984
 
RECORDS FOR APRIL 20
HIGH 88 IN 1927
LOW  18 IN 1897
PRECIP 1.14 IN 1972
SNOWFALL 2.5 IN. IN 1904, 1972
PEAK GUST 76 MPH WNW IN 1963

TODAY'S REPORT By: Stephanie Radner