Re: Albert with winds of 60 mph.
Posted by
Chris in Tampa on 5/19/2012, 10:04 pm
I think it was more the pressure reading. Not sure where it came from, but in the 5PM advisory it was estimated to be 1007mb. Then it is 995 mb. The winds were estimated based on the pressure. Then it seems like they probably used something like Dvorak:
| Dvorak Current Intensity Chart | | Current Intensity (CI) Number | Mean Wind Speed (Knots) | Mean Wind Speed (MPH) | Mean Sea Level Atmospheric Pressure in Millibars
(Atlantic) | Mean Sea Level Atmospheric Pressure in Millibars
(NW Pacific) | Saffir-Simpson Category (Approximate) | | 1 | 25 KTS | 29 MPH | | | | | 1.5 | 25 KTS | 29 MPH | | | | | 2 | 30 KTS | 35 MPH | 1009 mb | 1000 mb | | | 2.5 | 35 KTS | 40 MPH | 1005 mb | 997 mb | | | 3 | 45 KTS | 52 MPH | 1000 mb | 991 mb | | | 3.5 | 55 KTS | 63 MPH | 994 mb | 984 mb | | | 4 | 65 KTS | 75 MPH | 987 mb | 976 mb | 1 (64-83 KTS) | | 4.5 | 77 KTS | 89 MPH | 979 mb | 966 mb | 1 (64-83 KTS);
2 (84-96 KTS) | | 5 | 90 KTS | 104 MPH | 970 mb | 954 mb | 2 (84-96 KTS);
3 (97-113 KTS) | | 5.5 | 102 KTS | 117 MPH | 960 mb | 941 mb | 3 (97-113 KTS) | | 6 | 115 KTS | 132 MPH | 948 mb | 927 mb | 4 (114-135 KTS) | | 6.5 | 127 KTS | 146 MPH | 935 mb | 914 mb | 4 (114-135 KTS) | | 7 | 140 KTS | 161 MPH | 921 mb | 898 mb | 5 (136+ KTS) | | 7.5 | 155 KTS | 178 MPH | 906 mb | 879 mb | 5 (136+ KTS) | | 8 | 170 KTS | 196 MPH | 890 mb | 858 mb | 5 (136+ KTS) |
From: http://www.ssd.noaa.gov/PS/TROP/CI-chart.html
Just a note but the hurricane scale has changed every so slightly and that page has not been updated. Changes: 3 (from 97-113 KTS to 97-111 KTS), 4 (from 114-135 KTS to 113-136 KTS) 5 (from 136+ KTS to 137 knots or greater) |
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Albert with winds of 60 mph. -
LawKat,
5/19/2012, 8:15 pm Post A Reply
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