Section 9. Transcribed Weather Broadcast (TWEB)
The Transcribed Weather Broadcast (TWEB) and synopsis for selected routes are prepared by NWFOs and forwarded to the WMSC for distribution. All times are in UTC and listed by daylight/standard times. (See TBL 9-9-1.)
a. The morning and mid-day TWEB and synopsis will be valid for 12 hours. The evening TWEB and synopsis will be valid 18 hours with no outlook.
b. Eastern and Central TWEBs must not be entered prior to H+20 for hours 10, 17, and 22 UTC. Mountain and Pacific TWEBs must not be entered prior to H+20 for hours 11, 18, and 23 UTC.
9-9-2. CROSS-COUNTRY ROUTES
WMSC's storage contains a selection of combined individual route segments that defines cross-country routes. These routes are defined in AC 00-45. Section 4 defines the route segment and lists the number for each cross-country route.