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Areas of Severe Thunderstorms and Heavy Rain Possible through the Weekend

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 >

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Table A

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TABLE A

Data Type Designator T1 Matrix Table
for
T2A1A2ii   definitions

T1 Data type     T2     A1 A2 ii     Priority Max Length
A Analyses     B1     C1 C1 **     3 15,000
B Service message     ***     *** *** ***     1/2/4* 15,000
C Climatic data     B1     C1 C1 **     4 15,000
D Grid point information (GRID)     B2     C3 C4 D2     3 15,000
E Satellite imagery     B5     C1 C1 **     3 (1)
F Forecast     B1     C1 C1 **     3 15,000
G Grid point information (GRID)     B2     C3 C4 D2     3 15,000
H Grid point information (GRIB)     B2     C3 C4 D2     3 15,000
I Binary observation - BUFR     B3     C6 C3 **     3 15,000
J forecast Information - BUFR     B3     C6 C4 D2     3 15,000
K CREX     C7     C7 C3 **     2 15,000
L --            
M --            
N Notices     B1     C1 C1 **     4 15,000
O Oceanographic (GRIB)     B4     C3 C4 D1     3 15,000
P Pictorial information(binary)     B6     C3 C4 D2     3 15,000
Q Pictorial information regional     B6     C3 C5 D2     3 (1)
R --            
S Surface data     B1     C1/C2 C1/C2 **     2/4* 15,000
T Satellite data     B1     C3 C4 **     2 15,000
U Upper-air data     B1     C1/C2 C1/C2 **     2 15,000
V National data     (3)     C1 C1 **     (2) (1)
W Warnings     B1     C1 C1 **     1 15,000
X GRID regional use     B2     C3 (2) D2     3 15,000
Y GRIB regional use     B2     C3 (3) D2     3 15,000
Z GRIB National use     (3)     (3) (3) (3)     3 15,000

* Priority level:

  • 1 is allocated to service messages 2 is allocated to data and request messages
  • 4 is allocated to seismologic data (T1T2 = SE) or administrative messages
** See Para.2.3.2.2 for definition and use
*** See Para.2.4.2 for definition and use
(1) Max size to 250K
(2) To be determined later date
(3) Table B2 or national table

DATA TYPES Y and Z uses National tables in some countries

U.S. National Practice Tables

      H uses C8 instead of C3
      Y & Z uses B7 instead of B2
      Y & Z uses C8 instead of C3
      Y & Z uses C9 for the T2 A1 fields to define a TILE number when the heading uses KWBZ
      Y & Z uses C10 for forecast hours
      Y & Z uses D3 instead of D2