Recent National Weather Service and NOAA forecasts indicate a frontal system and associated moisture surge will drive precipitation chances across the southern tier of the U.S. on October 4, with the highest probabilities concentrated along the Gulf Coast, Southeast, and southern Plains. Official guidance highlights stalled cold fronts interacting with easterly flow to produce showers and thunderstorms, consistent with the early-October wet pattern tied to developing El Niño influences. In contrast, the Pacific Northwest and much of the West Coast face drier conditions under high pressure. Short-range models show good agreement on timing and location through the next 24-48 hours, though exact rainfall amounts remain sensitive to mesoscale features. Updated WPC probability of precipitation guidance and local NWS briefings expected later today will provide the final refinements ahead of market resolution.