From: Robert Skilling To: Cc: Subject: BLUEHILL MA 221300 high overcast 60 20/-12/WSW05/3040F/LO 08 Date: Thursday, February 22, 2001 2:06 PM BLUE HILL METEOROLOGICAL OBSERVATORY, MILTON, MASSACHUSETTS 02186 ELEVATION 635 FT. ABOVE MSL....10 MILES SSW OF BOSTON, MA THURSDAY FEBRUARY 22 2001... PLEASE VISIT OUR WEB SITE AT: http://www.bluehill.org/ All of our daily February data to date are included on this page below.... DAILY DISCUSSION....1 P.M. 2/22/2001 ANOTHER WINDY DAY YESTERDAY WITH GUST TO 50 MPH WNW (Aerovane) WINDS DIMINISH RAPDILY EARLY THIS MORNING AND TEMP. DROPS TO 8 DEGREES..VERY DRY AIR WITH DEWPOINTS NEAR 10-14 BELOW ZERO TODAY Although winds were very gusty all day yesterday beginning with the passage of the Arctic cold front at mid-morning, the peak wind gust did not occur until after dark early last evening. Aerovane recorded a peak of 50 MPH WNW at 6:34 P.M. and ASOS had 44 MPH WNW at the same time. Maximum, Inc. Maestro had a 55 mph gust. Our official peak gusts have hit 40 MPH or higher on seven days this month. This morning's low temperature was 8 degrees by 6:30 a.m. but winds had diminished to only about 4 MPH. The airmass is extremely dry today with dewpoints near 10 below zero as measured by psychrometer. At times we measured a dewpoint near 14 below zero. The ASOS dewpoint has been several degrees on the high side when compared to the manual readings. TODAY'S MANUAL OBSERVATIONS AT BLUE HILL... 2/22/2001 THU 7 A.M. clear with 70 miles visibility and 10 degrees...wind w at 3 mph.. BHO SA 1155 CLR 70 304/10/-5/2702/043/ SC ALG/OFFSHR NE-SE FEW CI NE-SE CS LYR DSNT SE-SW/ 8/501/ 4/001 53012 10013 20008 10 A.M. high thin scattered with 80 miles visibility and 16 degrees... wind w at 08 mph... BHO SA 1455 300 -SCT 80 313/16/-11/2807/045/ FEW SC DSNT OFFSHR NE-SE CS LYR SE-W WND 21V32/ 8/505/ 50009 1 P.M....high overcast with halo and 60 miles vsby and 20 degrees... very dry with relative humidity 23%....wind wsw at 05 mph... BHO SA 1755 E250 OVC 60 296/20/-12/2504/040/ BINOVC DSNT NNW-NE SOLAR HALO VSBY NE 25/THN K LYR NE VSBY NW 70 WND L/V/ 8/006/ 56017 10021 20009 DATA RECORDED FOR WEDNESDAY FEBRUARY 21... TEMPERATURES.... MAX 39 MIN 14// ASOS MAX 39 ASOS MIN 14 MEAN 27 [- 1 ] TOTAL DEP FOR MONTH: + 69 degrees The month of February is running 3 degrees milder than normal daily. PRECIPITATION.... 24 HRS ENDING 7 A.M...0.00 IN. MONTH: 2.10 [ - 1.14] YEAR: 5.25 [ - 2.14] SNOWFALL... 24 HRS ENDING 7 A.M...NONE MONTH: 14.8 INS. SEASON: 44.6 INS. PEAK GUST ASOS: 44 MPH WNW @ 6:34 P.M. PEAK GUST: 44 MPH WNW @ 6:34 P.M. PEAK GUST AERO: 50 MPH WNW @ 6:34 P.M. RECORDS FOR FEBRUARY 22 HIGH 63 IN 1997 LOW -01 IN 1918 PRECIP 1.38 INS IN 1900 WIND 74 MPH S IN 1974 RECORDS FOR FEBRUARY 23 HIGH 62 IN 1990 LOW -08 IN 1907 PRECIP 1.48 INS IN 1967 WIND 73 MPH WNW IN 1974 DAILY FEBRUARY 2001 DATA....AT BLUE HILL... max/min/mean/dep/precip/snow/sun mins/%/pk gust 1 45/30/38/+13/0/0/325/54/31 W 2 38/27/33/+8/0.02/0.2/060/10/24 W 3 32/18/25/-+/0/T/T/497/82/40 W 4 30/13/22/-3/0/0/176/29/ 20 S 5 36/26/31/+6/1.55/11.5/000/00/ 46 N 6 40/28/34/+8/0.08/1.0/411/67/ 51 NW (62 MPH NW Aero) 7 40/27/34/+8/0/0/615/100/ 35 WNW 8 36/24/30/+4/0.12/1.6/049/08/23 WNW 9 46/29/38/+12/0.07/T/000/00/39 SSW 10 48/20/34/+8/0.01/0/536/86/64 W (69 MPH W Aero) 11 21/10/16/-10/0/0/625/100/48 NW (55 MPH NW Aero) 12 29/05/17/-10/0/0/629/100/30 WNW 13 43/22/33/+6/T/0.1/536/85/29 WNW 14 41/28/35/+8/0.05/0/152/24/35 SSW 15 40/27/34/+7/T/0/191/30/33 NW 16 38/23/31/+4/0.19/0.4/089/14/22 SE 17 34/14/24/-3/0.01/T/372/58/ 59 W (Aero 62 MPH W) 18 27/08/18/-10/0/0/644/100/ 36 WNW 19 38/17/28/+-0/537/83/ 36 SSW 20 53/33/43/+15/0/0/.../../ 31 SSW 21 39/14/27/-1/0/0/.../../ 44 WNW (Aero 50 MPH WNW) 22 morning low temp. 08 degrees... Robert Skilling