BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, APRIL 28, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME

MORNING FOG BREAKS INTO WARM SUNSHINE...CUMULUS
BUILDING THIS AFTERNOON...APRIL NOW 5TH WETTEST
ON RECORD...
The final storm total for the Friday rainfall was
1.09 inches including heavy rain in the morning,
showers in the afternoon and drizzle later in
the evening.  Dense fog persisted on the summit
into mid-morning today, with strong sunshine after
11 AM EDT pushing the temperature to the mid-60s.
Moderate building cumulus are filling the sky
this afternoon, with a chance of showers into
tomorrow. Friday's rainfall brought the monthly
total precipitation up to 8.50 inches, making 
this at least the 5th wettest April on record
with more rainfall possible the next few days.
The combined precipitation for March-April is up
to 14.52 inches after a dry start to the year with
just 5.72 inches combined in January and February. 

Wettest Aprils (inches)

1) 10.37 in 1987
2) 9.38 in 2004
3) 8.71 in 1929
4) 8.53 in 1904
5) 8.50 in 2007 (through 27th)

Today's observations:

7 A.M.   
Weather: Sky obscured, dense fog  
Temperature: 46F, Dew point: 46F, Wind: SSW at 4 kts  
Sea-level pressure: 29.79 ins. Hg, rising 
Visibility: 1/8 mile, fog 
6-hour min. 42 deg.   
24-hour rainfall: 0.40 in.  
BHO SA 1155 W2 X 1/8F 087/46/46/2004/979/ WND LGT/ 
8//// 51004 70040 10046 20043 

10 A.M.
Weather: Overcast stratus and stratocumulus with breaks 
Temperature: 52F, Dew point: 51F, Wind: S at 3 kts 
Sea-level pressure: 29.76 inches Hg, falling 
Visibility: 7 miles  
BHO SA 1455 E5 BKN 15 OVC 7 077/52/51/1803/976/ BINOVC 
OVHD SUN OCNL VSBL VSBY INCR WND LGT AND VRB/ 8/5// 
58010

1 P.M.
Weather: Scattered cumulus, few altocumulus, scattered cirrus
Temperature: 65F, Dew point: 51F, Wind: SE at 6 kts
Sea-level pressure: 29.72 inches Hg, falling 
Visibility: 35 miles, 15 miles NW-NE with fog along horizon
to NNE-ENE 
6-hourly max. temp. 65 deg.
BHO SA 1755 25 SCT 35 SCT 250 SCT 35 063/65/51/1306/972/ 
FEW AC FEW MDT CU STRA/FG ALNG HRZN NNE-ENE VSBY NW-NE 15 
HAZY WND LGT AND VRB/ 8/271 58014 10065 20046

WEATHER SUMMARY FOR FRIDAY, APRIL 27 

TEMPERATURE (DEGREES F)
MAX.....48    NORMAL.....60 
MIN.....42    NORMAL.....41
MEAN....45    NORMAL.....50
DEPARTURE FROM 30-YEAR NORMAL...........-5
TOTAL DEPARTURE FOR THE MONTH..........-63 (-2.5 DEGREES/DAY) 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY..........20   DEPARTURE.........+5
TOTAL HEATING UNITS FOR THE MONTH.........584   DEPARTURE........+64 
TOTAL HEATING UNITS FOR THE SEASON.......5578   DEPARTURE.......-406
TOTAL HEATING UNITS LAST SEASON TO DATE..5368   DIFFERENCE......+210 

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............25  E AT 7:17 A.M.
                   AEROVANE.............22  E AT 7:17 A.M.* 
                   ASOS.................25  E AT 7:06 A.M.
                   DAVIS................23  E AT 7:09 A.M.
FASTEST MILE FOR YESTERDAY..............18  E AT 7:07 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...........21  E AT 7:09 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..........19  E AT 7:09 A.M.
AVERAGE WIND SPEED AND DIRECTION........8.3 NNE  
                    ASOS................7.2    
                    DAVIS...............7.7 E [88 degrees] 
* Last of several occurrences.
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.40  DEPARTURE.....+0.27
                         ASOS..............0.44
TOTAL PRECIPITATION FOR THE MONTH..........8.50  DEPARTURE.....+4.57  
                         ASOS..............8.16    
TOTAL PRECIPITATION FOR THE YEAR..........20.24  DEPARTURE.....+2.68
                         ASOS.............19.80   
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE......-0.1
TOTAL SNOWFALL FOR THE MONTH................0.2  DEPARTURE......-2.6 
TOTAL SNOWFALL FOR THE SEASON..............27.6  DEPARTURE.....-32.1  
    
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/-5/0/0/712/90          22 SSE
4/12 39/32/36/-9/0.89/T/000/00       42 E      Aero 40 MPH E
4/13 47/31/39/-6/0/0/096/12          41 W      Aero 42 MPH W
4/14 52/35/44/-2/0/0/392/49          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/-9/0.69/T/000/00       54 NNE    Aero 53 MPH NNE
4/18 39/36/38/-9/0.37/0/000/00       43 N
4/19 49/36/43/-4/0.02/T/285/35       38 NE     Aero 35 MPH NE 
4/20 57/36/47/-1/0/0/815/100         31 N
4/21 74/45/60/+12/0/0/753/92         24 NW
4/22 75/50/63/+14/0/0/779/95         31 SSE     
4/23 85/49/67/+18/0/0/675/82         42 S      Davis 45 MPH S 
4/24 73/50/62/+13/0/0/586/71         39 W      Aero  41 MPH W
4/25 58/43/51/+1/0.23/0/083/10       27 WNW 
4/26 62/39/51/+1/0/0/.../..          30 SSE    Aero  28 SSE
4/27 48/42/45/-5/1.09/0/.../..       25 E

4/28 morning low temp. 43 deg; normal now 41 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.  					

4/23 - EQUALED RECORD HIGH MAXIMUM TEMPERATURE OF 85 DEGREES set in 1908. 

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

RECORDS FOR APRIL 28
HIGH 92 IN 1990
LOW  26 IN 1947
PRECIP 2.41 IN 1904
SNOWFALL 10.0 IN. IN 1987
PEAK GUST 69 MPH NE 1967

RECORDS FOR APRIL 29
HIGH 85 IN 1974
LOW  26 IN 1909
PRECIP 1.65 IN 1923
SNOWFALL 1.0 IN. IN 1987
PEAK GUST 54 MPH WSW IN 1981

TODAY'S REPORT By: Mike Iacono   

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