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Tropical Moisture Brings Slight Risk of Excessive Rainfall to the Southwest; Strong to Locally Severe Storms on the Plains

Heavy rain and flash flooding are possible across portions of the Southwest through Friday, where Flood Watches are in effect. Strong to locally severe thunderstorms are possible today across portions of the Plains. A tropical wave is causing heavy rainfall in Puerto Rico and the Virgin Islands, which may cause urban and small stream flooding and landslides today. Read More >

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Table C5

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Table C5

Reference Time designator A2

(when T1   =   Q, X, or Y)

Instructions for the proper application of the reference time designator

1. The designator specified in this table should be used to the greatest extent possible to indicate the reference time of data contained within the text of the bulletin.

2. When the table does not contain a suitable designator for the reference time, an alphabetic designator which is not assigned in the table should be introduced and the WMO secretariat notified.

Designator
Data Type
Designator
Data Type
A Analysis (00 hour) N 39 hours forecast
B 3 hours forecast O 42 hours forecast
C 6 hours forecast P 45 hours forecast
D 9 hours forecasts Q 48 hours forecast
E 12 hours forecast R 54 hours forecast [48+6]
F 15 hours forecast S 66 hours forecast [+12]
G 18 hours forecast T 78 hours forecast
H 21 hours forecast U 90 hours forecast
I 24 hours forecast V 102 days forecast
J 27 hours forecast W 114 days forecast
K 30 hours forecast X 126 days forecast
L 33 hours forecast Y 138 days forecast
M 36 hours forecast Z 150 days forecast