UPDATED 19 April 2009... see the Google links at the bottom of this post.

Some quick formulas for estimating Hurricanes:

From 1013mb to 1000mb-A 1mb drop, in pressure, equals a 5mph increase in windspeed.

From 1000mb to 890mb- A 1mb drop, in pressure, equals a 1 mph increase in windspeed.

Delta P-or change in pressure:
After a storm reaches 75mph. A rough estimation of the Maximum Possible Windspeed (at Flight Level or 10000 feet) may be assumed by using the following formula.
1000 - present pressure in mb= deltaP
deltaP + 75 = Rough estimate of the Max Poss Wind.

eg. Katrina 1000-902=98+75= 173mph
eg. Rita 1000-899=101+75=176mph

more to follow...
(these have not been peer reviewed)

Storm Surge estimation:
1010mb- Storm's lowest pressure/ 4 = maximum possible storm surge, in feet.
Katrina__ 1010-902=108 / 4 =27feet
Rita_____1010-937= 73 / 4 = 18.25feet ( at landfall)

See Attachment, above, for a printable jpg of the HurriSheet.

Google Online Spreadsheet here: HurriSheet Spreadsheet
HurriSheet PDF.. ready to print