Converted: Knots/MPH

Ixolib · #1 Postby **Ixolib** » Mon Sep 06, 2004 9:43 pm

This may already be permanently posted elsewhere, but if not, I've found it useful for quick reference when reading forecasts, etc...

calidoug · #2 Postby **calidoug** » Mon Sep 06, 2004 10:02 pm

It's really not that bad to do in your head:

Add 15% to knots.

So add 10% (very easy), and then add half as much:

Say... 112kt + 11.2 + 5.6 = 128.8 mph

dennis1x1 · #3 Postby **dennis1x1** » Mon Sep 06, 2004 10:03 pm

well its closer to 10% than 15% actually..11.5% to be precise.

Ixolib · #4 Postby **Ixolib** » Mon Sep 06, 2004 10:08 pm

Me? Addition... Percentages... In MY head??? Still working on that skill

bahamaswx · #5 Postby **bahamaswx** » Mon Sep 06, 2004 10:10 pm

15.2%

#6 Postby **vbhoutex** » Mon Sep 06, 2004 10:13 pm

11.58% or knots x 1.158=mph

dennis1x1 · #7 Postby **dennis1x1** » Mon Sep 06, 2004 10:14 pm

doh...im an idiot....its 1.15x.......which is of course 15%.....

slams head on table in shame.

dennis1x1 · #8 Postby **dennis1x1** » Mon Sep 06, 2004 10:15 pm

woohooo..someone else making the same mistake i did!!

soonertwister · #9 Postby **soonertwister** » Mon Sep 06, 2004 10:33 pm

It's so close to 15% that it's waste to use any other conversion factor. After all, wind is just a measurement in a moment in time. Since knots to mph is a conversion of 1.15:1 well within .1 knot OR mph, don't waste your time on any fancy calculations.

The main thing to remember is that the NHC always rounds knots down to nearest 5 mph below 1.15 times knots, unless it is within 2.0 mph of the higher miles per hour figure. Remember, we are talking about wind here. Exact numbers aren't nearly as important as the nature of the threat.

Thus, if a hurricane is 115 knots it's 130 mph, but if it's 120 knots, it's 140 mph.

Converted: Knots/MPH

Converted: Knots/MPH

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