Convective Outlook
— Day 1
No Severe Thunderstorms Forecast
Summary
Severe storms are not expected today.
Synopsis and Discussion
An upper trough will exit the northeastern states today, with northwest flow aloft extending from the northern Plains to the East Coast. Upper ridging will occur over the Rockies, while a large upper trough slowly approaches the West Coast.
At the surface, high pressure will result in relatively stable conditions for much of the central and eastern CONUS, with centers over the Mid Atlantic and near the northern Gulf Coast.
In the wake of the eastern trough, winds just off the surface will maintain a zone of elevated moisture and instability over much of TX, where scattered showers and storms will be most likely. Weak instability will preclude any severe storm chances there.
To the west, cooling aloft with the approaching upper trough will support weak instability into parts of OR and WA, with isolated late day thunderstorms possible over portions of the Cascades. Small/non-severe hail cannot be ruled out, along with locally gusty winds mainly in the 00-03Z time frame.
..Jewell/Chalmers.. 04/20/2026
000 ACUS01 KWNS 200420 SWODY1 SPC AC 200418 Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1118 PM CDT Sun Apr 19 2026 Valid 201200Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe storms are not expected today. ...Synopsis... An upper trough will exit the northeastern states today, with northwest flow aloft extending from the northern Plains to the East Coast. Upper ridging will occur over the Rockies, while a large upper trough slowly approaches the West Coast. At the surface, high pressure will result in relatively stable conditions for much of the central and eastern CONUS, with centers over the Mid Atlantic and near the northern Gulf Coast. In the wake of the eastern trough, winds just off the surface will maintain a zone of elevated moisture and instability over much of TX, where scattered showers and storms will be most likely. Weak instability will preclude any severe storm chances there. To the west, cooling aloft with the approaching upper trough will support weak instability into parts of OR and WA, with isolated late day thunderstorms possible over portions of the Cascades. Small/non-severe hail cannot be ruled out, along with locally gusty winds mainly in the 00-03Z time frame. ..Jewell/Chalmers.. 04/20/2026 $$