May 7, 2025 Wednesday Weather Update
Warmer pattern ahead for Eastern U.S. once we ditch a trough
May 2025 was the 27th-warmest May in the 132-year national record (1895–2026), at 61.7°F against a 1991–2020 normal of 61.0°F (+0.7°F).
May 2025 was the 12th-wettest May in the 132-year national record (1895–2026), at 3.7in against a 1991–2020 normal of 3.1in (+0.6in).
NOAA/NCEI Climate at a Glance, contiguous United States. This is the observed record for the month, not a score of anything said in this piece — the forecast ledger begins 2026-08-17 and cannot reach earlier posts.
The Great Omega Block of early May 2025 has weakened with the troughs or cut-off lows eroded beneath two ridges — one in central Canada and the other off the NE Atlantic coast. We’re still dealing with the weakness associated with the Southwest trough that has expanded eastward into Texas and Oklahoma.
Just ahead of the leading mid-level low, the cyclonic circulation is pulling a deep layer of moisture out of the western Gulf of Mexico. The Integrated Vapor Transport (IVT) analysis from 00z (last evening 8 pm ET) showed the setup well explaining the heavy rain in eastern Texas and across all of Louisiana.
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