Just been checking on the US JTWC figures for windspeed….it seems that the figures are not actual speeds but warnings, predictions, estimates, of what the speed might be……
Click on the picture to view and enlarge it:
The top estimate for the 7th of November is steady winds of 170m knots which is 195 mph……gusts of 205 knots…which is the now famous 235 mph.
On the 8th of November the estimate of what a possible windspeed is is a steady 145 knots or 166 mph, and gusts of 175 which is 201 mph.
But as you can see these are just estimated warnings issued on the 7th November (NR 019) and gives estimates up until the 12th.
The figures are warnings of what might be coming.
Here is the most up to date data for the 8th November from the JTWC (NR 023)…wonder what it says:
On the 8th of November actual windspeeds:
TYPHOON 31W (HAIYAN) WARNING NR 023 WARNING POSITION:
081800Z --- NEAR 12.4N 118.1E
MOVEMENT PAST SIX HOURS - 285 DEGREES AT 23 KTS
POSITION ACCURATE TO WITHIN 045 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS - 125 KT, GUSTS 150 KT
Max sustained wind speed…..125 knots…..or 144 mph or 231 kph
Gusts of 150 knots…..172 mph or 277 kph.
(So lowered from 145 and 175 kt to 125 and 150 kt)
It is the sustained wind speeds that count.
Hmm…. so the Australian weather office gave a wind speed of 232 kph and
the Philippines gave one of 235 kph….and the US actually gave one of 231 kph
for the 8th.
Maybe I’m reading that all wrong but it looks like a figure around 235 kph is correct.
Which is probably why the BBC is now reporting a max speed of 235kph.
Haiyan brought sustained winds of 235km/h (147mph), with gusts of 275 km/h (170 mph) and waves as high as 15m (45ft). In some places, as much as 400mm (15.75 inches) of rain fell.


