BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, MAY 27, 2008    
ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED
 
YESTERDAY WAS WINDIEST DAY SINCE APRIL 2ND 
WINDS FROM THE S-SSW WITH GUSTS OVER 40 MPH
TEMPS. REACH 80'S TODAY, WARMEST SINCE APRIL 
 
An average wind speed of 21 MPH yesterday from the south
made it our windiest day since 23 MPH on April 2nd.  Our
peak wind gusts reached over 40 MPH and ASOS had 43 MPH 
while the manual system had 42 MPH. One of our other unofficial
recorders had 46 MPH.
 
Today's high temperatures have made it to 80 degrees along
with the first summer-time type humidity. The dewpoints have 
climbed into the low 60's. Tops of cumulonimbus clouds 
within a squall line approaching from the west can be seen as
anvil-type cirrus to the west through north early this 
afternoon. 
 
Today's observations:
 
8 A.M. EDT
Weather: Overcast altostratus, dense cirrus, break in overcast 
to the NW [a line of clearing]  
Temperature: 60F, Dew point: 57F,  Wind: S at 14 kts 
Sea-level pressure: 29.84 inches Hg, steady
Visibility: 6 miles, thin fog 
6-hourly minimum temperature: 59F
6-hourly rainfall: 0.01 in. 
24-hourly rainfall: 0.01 in. 
BHO SA 1155 E150 BKN 200 OVC 6F 104/60/57/1714/984/ FEW SC DSNT ESE-S 
DENS CI OVHD-NW BINOVC/LINE OF CLRG WNW-NNW VSBY N 8/ 8/522 51008 ASOS 
60001 MANUAL 6001/ ASOS 70001 MANUAL 70001 10060 20059
 
11 A.M. EDT
Weather: Clear, altocumulus layer E-S receding  
Temperature: 71F, Dew point: 62F,  Wind: S at 12 kts
Sea-level pressure: 29.83 inches Hg, falling
Visibility: 12 miles, hazy  
BHO SA 1455 CLR 12 101/71/62/1812/983/ AC LYR E-S RCDNG HAZY/ 8/030 
58003
 
2 P.M. EDT
Weather:  Scattered cumulus, cumulonimbus anvil tops WNW-NNW
Temperature: 79F, Dew point: 62F,  Wind: S at 17G26 kts
Wind: peak gust from south at 28 kts @ 44 past the hour 
Wind: direction variability SE-SSW
Sea-level pressure: 29.79 inches Hg, falling
Visibility: 25 miles, hazy 
6-hourly maximum temperature: 80F  
BHO SA 1755 50 SCT 200 SCT 25 087/79/62/1717G26/979/ CB ANVIL TOPS 
WNW-NNW TCU DSNT W-N HAZY PK WND 1728/44/ WND 14V21/ 8/203 58014 
10080 20060
 
WEATHER SUMMARY FOR MONDAY, MAY 26 MEMORIAL DAY
 
TEMPERATURE (DEGREES F)
MAX.....78    NORMAL.....70
MIN.....52    NORMAL.....50
MEAN....65    NORMAL.....60
 
DEPARTURE FROM 30-YEAR NORMAL............+5  
TOTAL DEPARTURE FOR THE MONTH...........-46 [-2.0 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............0  DEPARTURE........-6
TOTAL HEATING UNITS FOR THE MONTH...........275  DEPARTURE.......+25 
TOTAL HEATING UNITS FOR THE SEASON.........5886  DEPARTURE......-384
TOTAL HEATING UNITS LAST SEASON TO DATE....5828  DIFFERENCE......+58  
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............42 S   AT 3:43 P.M. *      
                   AEROVANE............ 42 S   AT 3:43 P.M. *
                   ASOS.................43 S   AT 3:43 P.M.     
                   DAVIS................46 S   AT 2:31 P.M.       
FASTEST MILE FOR YESTERDAY..............34 S   AT 3:43 P.M. *   
MAXIMUM 2-MINUTE ASOS AVERAGE...........33 S   AT 3:44 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE..........38 SSW AT 2:32 P.M.         
                   AVERAGE............21.1 S 
                   ASOS...............20.4     
                   DAVIS..............19.0 S  [190 deg]      
* last of several occurrences.
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01   DEPARTURE......-0.11  
                         ASOS..............0.01
TOTAL PRECIPITATION FOR THE MONTH..........1.68   DEPARTURE......-1.49
                         ASOS..............1.59  
TOTAL PRECIPITATION FOR THE YEAR..........22.44   DEPARTURE......+1.32
                         ASOS.............24.82 #
# Includes erroneous ASOS precipitation data on 2/13/08.
 
PRELIMINARY CLIMATE SUMMARY FOR MAY 2008 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available, records not finalized
 
5/1  60/35/48/-4/0/786/93        30 W    Aero 28 MPH W
5/2  48/42/45/-7/0.07/000/00     21 ENE
5/3  43/41/42/-11/0.09/000/00    25 E    
5/4  50/42/46/-7/0.17/000/00     27 E
5/5  69/40/55/+2/0/752/88        24 ESE  
5/6  74/46/60/+6/0/686/80        25 W
5/7  75/48/62/+8/0/722/84        29 S
5/8  75/54/65/+11/0.08/172/20    42 W    Aero 42 MPH W 
5/9  56/43/50/-5/0.26/000/00     30 NE
5/10 57/44/51/-4/T/407/47        35 NNE  
5/11 58/41/50/-5/0/747/86        24 ENE  
5/12 47/42/45/-11/0/017/02       43 NNE  Aero 43 MPH NNE
5/13 63/43/53/-3/0/812/93        47 NNE  Aero 50 MPH NNE
5/14 64/47/56/-1/0/788/90        23 ENE
5/15 67/47/57/0/T/009/01         22 S  
5/16 59/45/52/-5/0.49/009/01     21 ENE
5/17 72/46/59/+2/0.47/449/51     33 W
5/18 71/50/61/+3/0.02/494/56     30 S
5/19 59/44/52/-6/0/566/64        46 W    Aero 44 MPH W   
5/20 64/42/53/-5/0.01/461/52     29 S 
5/21 69/46/58/-1/T/524/59        35 WSW  Aero 32 MPH WSW 
5/22 58/45/52/-7/0.01/089/10     26 WSW
5/23 70/43/57/-2/T/749/84        41 W    Aero 40 MPH W
5/24 69/47/58/-2/T/456/51        32 WNW
5/25 75/50/63/+3/0/.../..        29 SE   
5/26 78/52/65/+5/T/.../..        42 S
 
5/27 morning low temp. 59F; our normal low is now 50F
     morning rainfall: 0.01 in.
 
NEW DAILY RECORDS FOR MAY 2008
None to date.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 27
HIGH 92F IN 1914
LOW 36F IN 1915
PRECIP 1.40 INS IN 1898
PEAK GUST 55 S IN 1956
 
RECORDS FOR MAY 28
HIGH 90F IN 1929
LOW 39F IN 1917
PRECIP 2.48 INS 1906
PEAK GUST 51e MPH NE IN 1946
 
TODAY'S REPORT PREPARED By: Robert Skilling