There will be daily chances for scattered thunderstorms across portions of the Central and Eastern U.S. through the weekend, with severe thunderstorms possible in the northern Plains and Upper Midwest. Potential severe storm hazards may include large hail, damaging winds, and a few tornadoes. Storms could also produce heavy rain that may lead to isolated instances of flash flooding. Read More >
Instructions for the proper application of level designator.
1. The designator specified in this table should be used to the greatest extent possible to indicate the level of the data contained within the text of the bulletin.
2. When data at more than one level are contained in the text, the designator for only one of the levels should be used.
3. When the table does not contain a suitable designator for the level, a designator which is not assigned in the table should be used.
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1000 hPa |
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Air properties for the earth's surface |
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Level of the tropopause |
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Level of maximum wind |
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950 hPa |
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Level of 0oC isotherm |
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Not assigned - 975 hPa (U.S.use) |
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925 hPa |
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Not assigned - 875 hPa (U.S.use) |
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900 hPa |
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Any parameter reduced/sea level (MSLP) |
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Ground/water properties for the earth's surface (i.e. snow cover, wave & swell) |
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1000-500 hPa thickness |
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Boundary Layer |
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Hundreds and tens digits of the hectopascal level (e.g. 70 = 700 hPa;03 = 030 hPa) To include: 81 = 810 hPa = 6000ft FL 82 = 825 hPa (U.S.use) 77 = 775 hPa (U.S.use) 73 = 730 hPa = 9000ft FL 72 = 725 hPa(U.S.use) 67 = 675 hPa(U.S.use) 65 = 650 hPa = 12000ft FL 62 = 625 hPa(U.S.use) |
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Entire Atmosphere (e.g. precipitable water) |
| Note: The 810, 730, and 650 hPa levels are not being used as pressure levels, they are being used as geometric heights. | |
