Severe Storms

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1006 AM CST Sat Feb 01 2025 Valid 011630Z - 021200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible today over the Olympic Peninsula of northwest Washington. ...WA... Dry and stable conditions will preclude thunderstorms over most of the continental US today. The one exception will be in northwest WA, where strong/deep onshore flow and cold temperatures aloft (< -30C) will pose a risk of a few lightning flashes over the Olympic Peninsula. ..Hart/Barnes.. 02/01/2025 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1006 AM CST Sat Feb 01 2025 Valid 011630Z - 021200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible today over the Olympic Peninsula of northwest Washington. ...WA... Dry and stable conditions will preclude thunderstorms over most of the continental US today. The one exception will be in northwest WA, where strong/deep onshore flow and cold temperatures aloft (< -30C) will pose a risk of a few lightning flashes over the Olympic Peninsula. ..Hart/Barnes.. 02/01/2025 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1006 AM CST Sat Feb 01 2025 Valid 011630Z - 021200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible today over the Olympic Peninsula of northwest Washington. ...WA... Dry and stable conditions will preclude thunderstorms over most of the continental US today. The one exception will be in northwest WA, where strong/deep onshore flow and cold temperatures aloft (< -30C) will pose a risk of a few lightning flashes over the Olympic Peninsula. ..Hart/Barnes.. 02/01/2025 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1006 AM CST Sat Feb 01 2025 Valid 011630Z - 021200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible today over the Olympic Peninsula of northwest Washington. ...WA... Dry and stable conditions will preclude thunderstorms over most of the continental US today. The one exception will be in northwest WA, where strong/deep onshore flow and cold temperatures aloft (< -30C) will pose a risk of a few lightning flashes over the Olympic Peninsula. ..Hart/Barnes.. 02/01/2025 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1006 AM CST Sat Feb 01 2025 Valid 011630Z - 021200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible today over the Olympic Peninsula of northwest Washington. ...WA... Dry and stable conditions will preclude thunderstorms over most of the continental US today. The one exception will be in northwest WA, where strong/deep onshore flow and cold temperatures aloft (< -30C) will pose a risk of a few lightning flashes over the Olympic Peninsula. ..Hart/Barnes.. 02/01/2025 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1006 AM CST Sat Feb 01 2025 Valid 011630Z - 021200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible today over the Olympic Peninsula of northwest Washington. ...WA... Dry and stable conditions will preclude thunderstorms over most of the continental US today. The one exception will be in northwest WA, where strong/deep onshore flow and cold temperatures aloft (< -30C) will pose a risk of a few lightning flashes over the Olympic Peninsula. ..Hart/Barnes.. 02/01/2025 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1006 AM CST Sat Feb 01 2025 Valid 011630Z - 021200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible today over the Olympic Peninsula of northwest Washington. ...WA... Dry and stable conditions will preclude thunderstorms over most of the continental US today. The one exception will be in northwest WA, where strong/deep onshore flow and cold temperatures aloft (< -30C) will pose a risk of a few lightning flashes over the Olympic Peninsula. ..Hart/Barnes.. 02/01/2025 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0700 AM CST Sat Feb 01 2025 Valid 011300Z - 021200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected across the continental U.S. today or tonight. ...Synopsis... Water-vapor imagery this morning shows low-amplitude, progressive flow regime across the Lower 48 states. In the low levels, a cool/stable airmass will influence much of the eastern U.S. via surface high pressure centered over Ontario and moving into New England late tonight. Conditions will be hostile to thunderstorm development for almost the entire CONUS, with the exception associated with low-topped convection and perhaps a stray lightning flash possible near the WA coastal vicinity. ..Smith/Bentley.. 02/01/2025 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0700 AM CST Sat Feb 01 2025 Valid 011300Z - 021200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected across the continental U.S. today or tonight. ...Synopsis... Water-vapor imagery this morning shows low-amplitude, progressive flow regime across the Lower 48 states. In the low levels, a cool/stable airmass will influence much of the eastern U.S. via surface high pressure centered over Ontario and moving into New England late tonight. Conditions will be hostile to thunderstorm development for almost the entire CONUS, with the exception associated with low-topped convection and perhaps a stray lightning flash possible near the WA coastal vicinity. ..Smith/Bentley.. 02/01/2025 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0700 AM CST Sat Feb 01 2025 Valid 011300Z - 021200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected across the continental U.S. today or tonight. ...Synopsis... Water-vapor imagery this morning shows low-amplitude, progressive flow regime across the Lower 48 states. In the low levels, a cool/stable airmass will influence much of the eastern U.S. via surface high pressure centered over Ontario and moving into New England late tonight. Conditions will be hostile to thunderstorm development for almost the entire CONUS, with the exception associated with low-topped convection and perhaps a stray lightning flash possible near the WA coastal vicinity. ..Smith/Bentley.. 02/01/2025 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0700 AM CST Sat Feb 01 2025 Valid 011300Z - 021200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected across the continental U.S. today or tonight. ...Synopsis... Water-vapor imagery this morning shows low-amplitude, progressive flow regime across the Lower 48 states. In the low levels, a cool/stable airmass will influence much of the eastern U.S. via surface high pressure centered over Ontario and moving into New England late tonight. Conditions will be hostile to thunderstorm development for almost the entire CONUS, with the exception associated with low-topped convection and perhaps a stray lightning flash possible near the WA coastal vicinity. ..Smith/Bentley.. 02/01/2025 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0700 AM CST Sat Feb 01 2025 Valid 011300Z - 021200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected across the continental U.S. today or tonight. ...Synopsis... Water-vapor imagery this morning shows low-amplitude, progressive flow regime across the Lower 48 states. In the low levels, a cool/stable airmass will influence much of the eastern U.S. via surface high pressure centered over Ontario and moving into New England late tonight. Conditions will be hostile to thunderstorm development for almost the entire CONUS, with the exception associated with low-topped convection and perhaps a stray lightning flash possible near the WA coastal vicinity. ..Smith/Bentley.. 02/01/2025 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0700 AM CST Sat Feb 01 2025 Valid 011300Z - 021200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected across the continental U.S. today or tonight. ...Synopsis... Water-vapor imagery this morning shows low-amplitude, progressive flow regime across the Lower 48 states. In the low levels, a cool/stable airmass will influence much of the eastern U.S. via surface high pressure centered over Ontario and moving into New England late tonight. Conditions will be hostile to thunderstorm development for almost the entire CONUS, with the exception associated with low-topped convection and perhaps a stray lightning flash possible near the WA coastal vicinity. ..Smith/Bentley.. 02/01/2025 Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0359 AM CST Sat Feb 01 2025 Valid 041200Z - 091200Z ...DISCUSSION... Medium-range models continue to depict generally zonal flow across the U.S. through the medium-range period. By the start of the period, a prominent baroclinic zone at the leading edge of an Arctic airmass is progged to have become established in a roughly west-to-east manner from the Mid-Atlantic region west-southwestward into the southern Plains. Weak/subtle perturbations forecast to move across the U.S. within the background/fast westerly flow regime are expected to modulate the north-south position of this boundary, but with its average location remaining roughly unchanged through day 6 -- after which evolving model differences cast more substantial uncertainty into the forecast. At this time, it appears that mainly elevated convection -- and perhaps a limited potential for hail -- may evolve primarily north of the front, in the late day 4 to early day 6 time frame, from the central U.S. eastward into the Tennessee Valley/Mid South region. However, at this time, risk appears to limited/low to highlight with a 15% probability area. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0359 AM CST Sat Feb 01 2025 Valid 041200Z - 091200Z ...DISCUSSION... Medium-range models continue to depict generally zonal flow across the U.S. through the medium-range period. By the start of the period, a prominent baroclinic zone at the leading edge of an Arctic airmass is progged to have become established in a roughly west-to-east manner from the Mid-Atlantic region west-southwestward into the southern Plains. Weak/subtle perturbations forecast to move across the U.S. within the background/fast westerly flow regime are expected to modulate the north-south position of this boundary, but with its average location remaining roughly unchanged through day 6 -- after which evolving model differences cast more substantial uncertainty into the forecast. At this time, it appears that mainly elevated convection -- and perhaps a limited potential for hail -- may evolve primarily north of the front, in the late day 4 to early day 6 time frame, from the central U.S. eastward into the Tennessee Valley/Mid South region. However, at this time, risk appears to limited/low to highlight with a 15% probability area. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0359 AM CST Sat Feb 01 2025 Valid 041200Z - 091200Z ...DISCUSSION... Medium-range models continue to depict generally zonal flow across the U.S. through the medium-range period. By the start of the period, a prominent baroclinic zone at the leading edge of an Arctic airmass is progged to have become established in a roughly west-to-east manner from the Mid-Atlantic region west-southwestward into the southern Plains. Weak/subtle perturbations forecast to move across the U.S. within the background/fast westerly flow regime are expected to modulate the north-south position of this boundary, but with its average location remaining roughly unchanged through day 6 -- after which evolving model differences cast more substantial uncertainty into the forecast. At this time, it appears that mainly elevated convection -- and perhaps a limited potential for hail -- may evolve primarily north of the front, in the late day 4 to early day 6 time frame, from the central U.S. eastward into the Tennessee Valley/Mid South region. However, at this time, risk appears to limited/low to highlight with a 15% probability area. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0359 AM CST Sat Feb 01 2025 Valid 041200Z - 091200Z ...DISCUSSION... Medium-range models continue to depict generally zonal flow across the U.S. through the medium-range period. By the start of the period, a prominent baroclinic zone at the leading edge of an Arctic airmass is progged to have become established in a roughly west-to-east manner from the Mid-Atlantic region west-southwestward into the southern Plains. Weak/subtle perturbations forecast to move across the U.S. within the background/fast westerly flow regime are expected to modulate the north-south position of this boundary, but with its average location remaining roughly unchanged through day 6 -- after which evolving model differences cast more substantial uncertainty into the forecast. At this time, it appears that mainly elevated convection -- and perhaps a limited potential for hail -- may evolve primarily north of the front, in the late day 4 to early day 6 time frame, from the central U.S. eastward into the Tennessee Valley/Mid South region. However, at this time, risk appears to limited/low to highlight with a 15% probability area. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0359 AM CST Sat Feb 01 2025 Valid 041200Z - 091200Z ...DISCUSSION... Medium-range models continue to depict generally zonal flow across the U.S. through the medium-range period. By the start of the period, a prominent baroclinic zone at the leading edge of an Arctic airmass is progged to have become established in a roughly west-to-east manner from the Mid-Atlantic region west-southwestward into the southern Plains. Weak/subtle perturbations forecast to move across the U.S. within the background/fast westerly flow regime are expected to modulate the north-south position of this boundary, but with its average location remaining roughly unchanged through day 6 -- after which evolving model differences cast more substantial uncertainty into the forecast. At this time, it appears that mainly elevated convection -- and perhaps a limited potential for hail -- may evolve primarily north of the front, in the late day 4 to early day 6 time frame, from the central U.S. eastward into the Tennessee Valley/Mid South region. However, at this time, risk appears to limited/low to highlight with a 15% probability area. Read more

SPC 0830Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0227 AM CST Sat Feb 01 2025 Valid 031200Z - 041200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected across the U.S. on Monday. ...Discussion... Low-amplitude flow aloft is expected to prevail across the U.S. Monday, with the zonal regime trending weakly toward a western trough/central ridge/eastern trough configuration through the period. At the surface, a weak frontal wave along the slowly sagging baroclinic zone should shift out of the Plains across the Midwest through the day, and then across New England overnight. In the wake of this wave, the surface front will continue shifting southeastward/southward across the central and eastern states. By late in the period, the front should stretch from coastal New England southwestward to the Mid-Atlantic region, and then west-southwestward across the Tennessee and Lower Mississippi Valleys into Texas. While very weak low-level theta-e advection is expected ahead of the southward-moving front, moisture return should be quite insufficient to support appreciable destabilization. Meanwhile, with Arctic air spreading southward behind the front, a thermodynamic environment insufficient to support deep moist convection is forecast to persist across the U.S. through the period. ..Goss.. 02/01/2025 Read more

SPC 0830Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0227 AM CST Sat Feb 01 2025 Valid 031200Z - 041200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected across the U.S. on Monday. ...Discussion... Low-amplitude flow aloft is expected to prevail across the U.S. Monday, with the zonal regime trending weakly toward a western trough/central ridge/eastern trough configuration through the period. At the surface, a weak frontal wave along the slowly sagging baroclinic zone should shift out of the Plains across the Midwest through the day, and then across New England overnight. In the wake of this wave, the surface front will continue shifting southeastward/southward across the central and eastern states. By late in the period, the front should stretch from coastal New England southwestward to the Mid-Atlantic region, and then west-southwestward across the Tennessee and Lower Mississippi Valleys into Texas. While very weak low-level theta-e advection is expected ahead of the southward-moving front, moisture return should be quite insufficient to support appreciable destabilization. Meanwhile, with Arctic air spreading southward behind the front, a thermodynamic environment insufficient to support deep moist convection is forecast to persist across the U.S. through the period. ..Goss.. 02/01/2025 Read more