National Weather Service United States Department of Commerce

Arctic Cold Front Impacting the Great Lakes into the Northeast

A powerful Arctic cold front will sweep across the Great Lakes today and into the Northeast early Thursday. Expect brief, intense bursts of heavy snowfall and gusty winds. Widespread strong winds will spread from the Northern Plains to the Great Lakes today and reach the Central Appalachians, Mid-Atlantic, and Northeast by Thursday, where some blizzard conditions are expected in the Appalachians. Read More >

Telecommunication Operations Center

National Program

Table D2

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Table D2

Level designator ii

(when T1 = D,G,H,J, P,Q,X or Y)

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.

Designator
Level
99
 1000 hPa
98
 Air properties for the earth's surface
97
 Level of the tropopause
96
 Level of maximum wind
95
 950 hPa
94
 Level of 0oC isotherm
93
 Not assigned - 975 hPa (U.S.use)
92
 925 hPa
91
 Not assigned - 875 hPa (U.S.use)
90
 900 hPa
89
 Any parameter reduced/sea level (MSLP)
88
 Ground/water properties for the earth's surface
(i.e. snow cover, wave & swell)
87
 1000-500 hPa thickness
86
 Boundary Layer
85-01
 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)
00
 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.