Taiwan Typhoon Report

  Wednesday July 11th

  • All Day
    • Hsinchu City
    • Miaoli County
    • Taoyuan City
    • Hsinchu County
    • New Taipei City
    • Yilan County
    • Lienchiang County (Matsu Island)

If you were scheduled to work Wednesday July 11th please check before going in. 

Taiwan Typhoons

Typhoon Maria

Typhoon Maria is a very large, very fast-moving storm which will bring extensive rains and very powerful winds to Taipei, Taoyuan & Keelung from 4pm Tuesday July 10th through noon Wednesday July 11th.

Radius is 280km, making it a very large storm, where 200km is average and 80 is small.  

Maria is an intense storm with winds of 198kmh, where 64kph is weak and 115kph is mid-strength.

Urban areas expected to get highest rainfall are Taipei, Taoyuan & Keelung.  Second highest urban rainfall is expected in Hsinchu, Miaoli & Central Taiwan.

The forecast highest period of rains will be from 8pm Tuesday July 10th to 8am Wednesday July 11th.

The eye of the storm is headed for the northern Taiwan.  However, the storm is not expected to make Landfall – the eye of the storm reaching land.  Instead, the eye is forecast to pass just north of Taiwan at 2am Wednesday July 11th.

This puts the eyewall, with its highest winds and heaviest rains, as moving right right next to Taipei-Taoyuan-Keelung: a dense urban, low-lying plain area of nearly 5 million people.  For a period of nearly 12 hours.  Localized flooding and extensive wind damage are a real possibility.

The eye of the storm will be closest to Taiwan from 2am to 7am Wednesday July 11th, passing just 100km off the shore from Taipei, New Taipei City & Keelung.  Highest forecast winds at Taipei, New Taipei City & Keelung during this period are 108kph with gusts of 144kph.

Fortunately, Maria is also moving very fast, 30kmh, where 5 or 6 is slow and 20 is average.  Meaning, the storm will arrive and pass beyond Taiwan very quickly.  The outer edge of the storm’s radius is expected to reach Taiwan at 4pm Tuesday July 10th and the entire storm is forecast to be off Taiwan by Wednesday noon July 11th.

Hualien from noon and Taidong from 8pm Tuesday July 10th will experience very high winds as the lee side of the storm passes.  Additionally, both are forecast to see high
Tuesday July 10th overnight temperatures, as high as 35 degrees centigrade.

Maria’s very large size combined with strong intensity forecasts extensive rainfall – 200mm / 8 inches in every 24-hour period.

Typhoon Maria is not expected to strengthen any more as it approaches and crosses Taiwan, and may even weaken slightly before it arrives.

The radius of the storm is forecast to blanket all of Taiwan except the southern tip.

Overall highest rainfall is forecast for the mountain areas of Taipei, Taoyuan & Keelung.  Second highest overall rainfall is for the mountain areas of Taichung, Nantou & Yilan.

Typhoon Maria will stop influencing Taiwan’s weather by 5pm Wednesday July 11th.  Very sunny skies are forecast for Thursday July 12th.


During an average year a total of 26-27 tropical systems will develop. Four usually in the first 6 months of the year & the remaining 20+ during the last 6 months.

Typhoon Q & A

What things should one do to prepare for a typhoon?

  1. In the aftermath of many storms, the hardest hit areas can have their water mains shut down. This can last for several days. Having a 5 gallon bottle of water, or two, in a closet somewhere can make drinking, eating (and showering or using the toilet) a lot easier. It won't be any fun getting them, but if you are in an area apt to be hard hit, having them there will make you pretty happy if things go bad in terms of water in your neighborhood.
  2. Sea warnings are announced 24 in advance radius affecting shipping lanes. Land Warnings 18 hours in advance of the radius of the storm reaching land.
  3. After wind damage, the most common problem faced in Taiwan comes from flooding. If you are in an area that is likely to be hard hit and on a ground floor or in a basement structure, get yourself and your stuff to a second floor.

What does "maximum sustained wind" mean ?

The maximum sustained wind mentioned are the highest 1 min surface winds occurring within the circulation of the system. These "surface" winds are those observed (or, more often, estimated) to occur at the standard meteorological height of 10 m (33 ft) in an unobstructed exposure (i.e., not blocked by buildings or trees).

During a Typhoon/hurricane are you supposed to have the windows and doors on the storm side closed and the windows and doors on the lee side open?

NO! All of the doors and windows should be closed throughout the duration of the hurricane. The pressure differences between the inside of your house and the outside in the storm do not build up enough to cause your windows to blow out.


  1. Tropical Disturbance (Tropical Wave): Unorganized mass of thunderstorms, very little, if any, organized wind circulation.
  2. Tropical Depression: Has evidence of closed wind circulation around a center with sustained winds from 20-34 knots (23-39 mph), and the storm generally doesn't feel very good about itself.
  3. Tropical Storm: Maximum sustained winds are from 35-64 knots (40-74 mph). The storm is named once it reaches tropical storm strength.
    The Taiwan weather service categorizes Tropical Storms as Category 1 Typhoons. (In Taiwan there are only 3 storm levels.)
  4. Typhoon or Hurricane: Maximum sustained winds exceed 64 knots (74 mph). Fives categories below:
Categories of Typhoons, Hurricanes
Western Category Miles per Hour /
Kilometers per Hour
Taiwan Category Description
1 74 - 95 /
119 - 153

Damage primarily to shrubbery, trees, foliage, and unanchored homes. No real damage to other structures. Some damage to poorly constructed signs. Low-lying coastal roads inundated, minor pier damage, some small craft in exposed anchorage torn from moorings.

2 96 - 110/
155 - 177

Considerable damage to shrubbery and tree foliage; some trees blown down. Major damage to exposed mobile homes. Extensive damage to poorly constructed signs. Some damage to roofing materials of buildings; some window and door damage. No major damage to buildings.

Coast roads and low-lying escape routes inland cut by rising water 2 to 4 hours before arrival of hurricane center. Considerable damage to piers. Marinas flooded. Small craft in unprotected anchorages torn from moorings. Evacuation of some shoreline residences and low-lying areas required.

3 111 - 130 /
179 - 209

2, up to
113 mph / 182 kph

3, from
114 mph / 183 kph

Foliage torn from trees; large trees blown down. Practically all poorly constructed signs blown down. Some damage to roofing materials of buildings; some wind and door damage. Some structural damage to small buildings. Mobile homes destroyed.

Serious flooding at coast and many smaller structures near coast destroyed; larger structures near coast damaged by battering waves and floating debris. Low-lying escape routes inland cut by rising water 3 to 5 hours before hurricane center arrives. Flat terrain 5 feet or less above sea level flooded inland 8 miles or more. Evacuation of low- lying residences within several blocks of shoreline possibly required.

4 131 - 155 /
211 - 249

Shrubs and trees blown down; all signs down. Extensive damage to roofing materials, windows and doors. Complete failures of roofs on many small residences. Complete destruction of mobile homes. Flat terrain 10 feet or less above sea level flooded inland as far as 6 miles.

Major damage to lower floors of structures near shore due to flooding and battering by waves and floating debris. Low-lying escape routes inland cut by rising water 3 to 5 hours before hurricane center arrives. Major erosion of beaches. Massive evacuation of all residences within 500 yards of shore possibly required, and of single-story residences within 2 miles of shore.

5 155 + /
250 +

Shrubs and trees blown down; considerable damage to roofs of buildings; all signs down. Very severe and extensive damage to windows and doors. Complete failure of roofs on many residences and industrial buildings. Extensive shattering of glass in windows and doors. Some complete building failures. Small buildings overturned or blown away. Complete destruction of mobile homes.

Major damage to lower floors of all structures less than 15 feet above sea level within 500 yards of shore. Low-lying escape routes inland cut by rising water 3 to 5 hours before hurricane center arrives. Massive evacuation of residential areas on low ground within 5 to 10 miles of shore possibly required.