Severe Storms

WW 0043 Status Updates
STATUS REPORT ON WW 43 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 W IER TO 35 SSE GGG TO 20 NE GGG TO 25 SSE TXK. WW 43 WILL BE ALLOWED TO EXPIRE AT 151500Z. ..SQUITIERI..03/15/25 ATTN...WFO...FWD...SHV...HGX...EWX...LCH... STATUS REPORT FOR WS 43 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS TXC203-365-419-151500- TX . TEXAS COUNTIES INCLUDED ARE HARRISON PANOLA SHELBY THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0043 Status Updates
STATUS REPORT ON WW 43 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 W IER TO 35 SSE GGG TO 20 NE GGG TO 25 SSE TXK. WW 43 WILL BE ALLOWED TO EXPIRE AT 151500Z. ..SQUITIERI..03/15/25 ATTN...WFO...FWD...SHV...HGX...EWX...LCH... STATUS REPORT FOR WS 43 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS TXC203-365-419-151500- TX . TEXAS COUNTIES INCLUDED ARE HARRISON PANOLA SHELBY THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0043 Status Updates
STATUS REPORT ON WW 43 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 W IER TO 35 SSE GGG TO 20 NE GGG TO 25 SSE TXK. WW 43 WILL BE ALLOWED TO EXPIRE AT 151500Z. ..SQUITIERI..03/15/25 ATTN...WFO...FWD...SHV...HGX...EWX...LCH... STATUS REPORT FOR WS 43 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS TXC203-365-419-151500- TX . TEXAS COUNTIES INCLUDED ARE HARRISON PANOLA SHELBY THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0043 Status Updates
STATUS REPORT ON WW 43 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 W IER TO 35 SSE GGG TO 20 NE GGG TO 25 SSE TXK. WW 43 WILL BE ALLOWED TO EXPIRE AT 151500Z. ..SQUITIERI..03/15/25 ATTN...WFO...FWD...SHV...HGX...EWX...LCH... STATUS REPORT FOR WS 43 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS TXC203-365-419-151500- TX . TEXAS COUNTIES INCLUDED ARE HARRISON PANOLA SHELBY THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 43 SEVERE TSTM TX 150755Z - 151500Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 43 NWS Storm Prediction Center Norman OK 255 AM CDT Sat Mar 15 2025 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of East-Central into Southeast and East Texas * Effective this Saturday morning from 255 AM until 1000 AM CDT. * Primary threats include... Scattered large hail and isolated very large hail events to 2.5 inches in diameter possible Scattered damaging wind gusts to 70 mph possible A tornado or two possible SUMMARY...Widely scattered to scattered storms are forecast to continue to develop and intensify overnight into the morning across the Watch area. The stronger storms will be supercells capable of a large-hail and damaging-wind risk. A tornado cannot be ruled out as storms approach the Sabine River during the morning. The severe thunderstorm watch area is approximately along and 75 statute miles north and south of a line from 55 miles west southwest of College Station TX to 50 miles east southeast of Longview TX. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU3). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && OTHER WATCH INFORMATION...CONTINUE...WW 36...WW 37...WW 38...WW 40...WW 41...WW 42... AVIATION...A few severe thunderstorms with hail surface and aloft to 2.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 24040. ...Smith Read more

MD 0194 CONCERNING SEVERE POTENTIAL...TORNADO WATCH LIKELY FOR NORTHWEST LOUISIANA INTO THE ARK-LA-MISS
Mesoscale Discussion 0194 NWS Storm Prediction Center Norman OK 0449 AM CDT Sat Mar 15 2025 Areas affected...Northwest Louisiana into the Ark-La-Miss Concerning...Severe potential...Tornado Watch likely Valid 150949Z - 151115Z Probability of Watch Issuance...80 percent SUMMARY...The severe thunderstorm/tornado threat will increase this morning as storm spread east-northeastward from Texas, and new storms developing along the instability gradient from northwest LA into the Ark-La-Miss. A new tornado watch is likely before 11z. DISCUSSION...In response to forcing for ascent in the exit region of a 100-120 kt upper jet streak, thunderstorms are ongoing in the instability gradient across east central and southeast TX. As the ascent spreads east-northeastward through sunrise, additional thunderstorm development is likely from northwest LA into the Ark-La-Miss. Continued northward moisture transport across LA and a gradual increase in low-level flow/shear (in response to weak cyclogenesis) will contribute to a more favorable supercell/tornado environment through the morning. Thus, a new tornado watch will likely be needed before 11z. ..Thompson/Smith.. 03/15/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...MEG...JAN...LZK...LCH...SHV... LAT...LON 34738915 33408971 31619139 31199215 31049303 31089347 31489369 32049398 32439401 33029352 33459297 34219197 34759099 35179002 35188937 34738915 Read more

WW 0044 Status Updates
STATUS REPORT ON WW 7 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 NNW PNS TO 10 SSE LGC. ..BROYLES..02/13/25 ATTN...WFO...BMX...MOB... STATUS REPORT FOR WT 7 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS ALC005-039-041-053-109-113-130940- AL . ALABAMA COUNTIES INCLUDED ARE BARBOUR COVINGTON CRENSHAW ESCAMBIA PIKE RUSSELL THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0044 Status Updates
STATUS REPORT ON WW 7 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 NNW PNS TO 10 SSE LGC. ..BROYLES..02/13/25 ATTN...WFO...BMX...MOB... STATUS REPORT FOR WT 7 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS ALC005-039-041-053-109-113-130940- AL . ALABAMA COUNTIES INCLUDED ARE BARBOUR COVINGTON CRENSHAW ESCAMBIA PIKE RUSSELL THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0044 Status Updates
STATUS REPORT ON WW 7 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 NNW PNS TO 10 SSE LGC. ..BROYLES..02/13/25 ATTN...WFO...BMX...MOB... STATUS REPORT FOR WT 7 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS ALC005-039-041-053-109-113-130940- AL . ALABAMA COUNTIES INCLUDED ARE BARBOUR COVINGTON CRENSHAW ESCAMBIA PIKE RUSSELL THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0357 AM CDT Sat Mar 15 2025 Valid 181200Z - 231200Z ...DISCUSSION... ...Tuesday/Day 4 and Wednesday/Day 5... At mid-levels, a trough is forecast to move eastward across the central U.S. on Tuesday and Wednesday. Ahead of the system, low-level moisture is forecast to return northward into the lower to mid Mississippi Valley, with surface dewpoints reaching the 40s and 50s F. This should contribute to an axis of weak instability by Tuesday afternoon. Along and near this axis, isolated to scattered thunderstorms are expected to develop from parts of Oklahoma to Iowa. The chance for storms is expected to continue ahead of the trough, as it moves into the mid Mississippi Valley on Wednesday. A severe threat will be possible near the moist axis in the afternoon. However, relatively low surface dewpoints and very weak instability should keep any severe threat isolated and marginal. ...Thursday/Day 6 to Saturday/Day 8... The mid-level trough in the Mississippi Valley is forecast to move eastward to the Atlantic Seaboard by Thursday night, as another trough moves into the High Plains. This second trough is forecast to move across the central U.S. on Friday, reaching the eastern U.S. on Saturday. Some moisture return is forecast late in the week in the western Gulf Coast states. Although an isolated severe threat would be possible within this moist airmass, predictability concerning any severe threat magnitude is substantial at this range. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0357 AM CDT Sat Mar 15 2025 Valid 181200Z - 231200Z ...DISCUSSION... ...Tuesday/Day 4 and Wednesday/Day 5... At mid-levels, a trough is forecast to move eastward across the central U.S. on Tuesday and Wednesday. Ahead of the system, low-level moisture is forecast to return northward into the lower to mid Mississippi Valley, with surface dewpoints reaching the 40s and 50s F. This should contribute to an axis of weak instability by Tuesday afternoon. Along and near this axis, isolated to scattered thunderstorms are expected to develop from parts of Oklahoma to Iowa. The chance for storms is expected to continue ahead of the trough, as it moves into the mid Mississippi Valley on Wednesday. A severe threat will be possible near the moist axis in the afternoon. However, relatively low surface dewpoints and very weak instability should keep any severe threat isolated and marginal. ...Thursday/Day 6 to Saturday/Day 8... The mid-level trough in the Mississippi Valley is forecast to move eastward to the Atlantic Seaboard by Thursday night, as another trough moves into the High Plains. This second trough is forecast to move across the central U.S. on Friday, reaching the eastern U.S. on Saturday. Some moisture return is forecast late in the week in the western Gulf Coast states. Although an isolated severe threat would be possible within this moist airmass, predictability concerning any severe threat magnitude is substantial at this range. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0357 AM CDT Sat Mar 15 2025 Valid 181200Z - 231200Z ...DISCUSSION... ...Tuesday/Day 4 and Wednesday/Day 5... At mid-levels, a trough is forecast to move eastward across the central U.S. on Tuesday and Wednesday. Ahead of the system, low-level moisture is forecast to return northward into the lower to mid Mississippi Valley, with surface dewpoints reaching the 40s and 50s F. This should contribute to an axis of weak instability by Tuesday afternoon. Along and near this axis, isolated to scattered thunderstorms are expected to develop from parts of Oklahoma to Iowa. The chance for storms is expected to continue ahead of the trough, as it moves into the mid Mississippi Valley on Wednesday. A severe threat will be possible near the moist axis in the afternoon. However, relatively low surface dewpoints and very weak instability should keep any severe threat isolated and marginal. ...Thursday/Day 6 to Saturday/Day 8... The mid-level trough in the Mississippi Valley is forecast to move eastward to the Atlantic Seaboard by Thursday night, as another trough moves into the High Plains. This second trough is forecast to move across the central U.S. on Friday, reaching the eastern U.S. on Saturday. Some moisture return is forecast late in the week in the western Gulf Coast states. Although an isolated severe threat would be possible within this moist airmass, predictability concerning any severe threat magnitude is substantial at this range. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0357 AM CDT Sat Mar 15 2025 Valid 181200Z - 231200Z ...DISCUSSION... ...Tuesday/Day 4 and Wednesday/Day 5... At mid-levels, a trough is forecast to move eastward across the central U.S. on Tuesday and Wednesday. Ahead of the system, low-level moisture is forecast to return northward into the lower to mid Mississippi Valley, with surface dewpoints reaching the 40s and 50s F. This should contribute to an axis of weak instability by Tuesday afternoon. Along and near this axis, isolated to scattered thunderstorms are expected to develop from parts of Oklahoma to Iowa. The chance for storms is expected to continue ahead of the trough, as it moves into the mid Mississippi Valley on Wednesday. A severe threat will be possible near the moist axis in the afternoon. However, relatively low surface dewpoints and very weak instability should keep any severe threat isolated and marginal. ...Thursday/Day 6 to Saturday/Day 8... The mid-level trough in the Mississippi Valley is forecast to move eastward to the Atlantic Seaboard by Thursday night, as another trough moves into the High Plains. This second trough is forecast to move across the central U.S. on Friday, reaching the eastern U.S. on Saturday. Some moisture return is forecast late in the week in the western Gulf Coast states. Although an isolated severe threat would be possible within this moist airmass, predictability concerning any severe threat magnitude is substantial at this range. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0357 AM CDT Sat Mar 15 2025 Valid 181200Z - 231200Z ...DISCUSSION... ...Tuesday/Day 4 and Wednesday/Day 5... At mid-levels, a trough is forecast to move eastward across the central U.S. on Tuesday and Wednesday. Ahead of the system, low-level moisture is forecast to return northward into the lower to mid Mississippi Valley, with surface dewpoints reaching the 40s and 50s F. This should contribute to an axis of weak instability by Tuesday afternoon. Along and near this axis, isolated to scattered thunderstorms are expected to develop from parts of Oklahoma to Iowa. The chance for storms is expected to continue ahead of the trough, as it moves into the mid Mississippi Valley on Wednesday. A severe threat will be possible near the moist axis in the afternoon. However, relatively low surface dewpoints and very weak instability should keep any severe threat isolated and marginal. ...Thursday/Day 6 to Saturday/Day 8... The mid-level trough in the Mississippi Valley is forecast to move eastward to the Atlantic Seaboard by Thursday night, as another trough moves into the High Plains. This second trough is forecast to move across the central U.S. on Friday, reaching the eastern U.S. on Saturday. Some moisture return is forecast late in the week in the western Gulf Coast states. Although an isolated severe threat would be possible within this moist airmass, predictability concerning any severe threat magnitude is substantial at this range. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0357 AM CDT Sat Mar 15 2025 Valid 181200Z - 231200Z ...DISCUSSION... ...Tuesday/Day 4 and Wednesday/Day 5... At mid-levels, a trough is forecast to move eastward across the central U.S. on Tuesday and Wednesday. Ahead of the system, low-level moisture is forecast to return northward into the lower to mid Mississippi Valley, with surface dewpoints reaching the 40s and 50s F. This should contribute to an axis of weak instability by Tuesday afternoon. Along and near this axis, isolated to scattered thunderstorms are expected to develop from parts of Oklahoma to Iowa. The chance for storms is expected to continue ahead of the trough, as it moves into the mid Mississippi Valley on Wednesday. A severe threat will be possible near the moist axis in the afternoon. However, relatively low surface dewpoints and very weak instability should keep any severe threat isolated and marginal. ...Thursday/Day 6 to Saturday/Day 8... The mid-level trough in the Mississippi Valley is forecast to move eastward to the Atlantic Seaboard by Thursday night, as another trough moves into the High Plains. This second trough is forecast to move across the central U.S. on Friday, reaching the eastern U.S. on Saturday. Some moisture return is forecast late in the week in the western Gulf Coast states. Although an isolated severe threat would be possible within this moist airmass, predictability concerning any severe threat magnitude is substantial at this range. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0357 AM CDT Sat Mar 15 2025 Valid 181200Z - 231200Z ...DISCUSSION... ...Tuesday/Day 4 and Wednesday/Day 5... At mid-levels, a trough is forecast to move eastward across the central U.S. on Tuesday and Wednesday. Ahead of the system, low-level moisture is forecast to return northward into the lower to mid Mississippi Valley, with surface dewpoints reaching the 40s and 50s F. This should contribute to an axis of weak instability by Tuesday afternoon. Along and near this axis, isolated to scattered thunderstorms are expected to develop from parts of Oklahoma to Iowa. The chance for storms is expected to continue ahead of the trough, as it moves into the mid Mississippi Valley on Wednesday. A severe threat will be possible near the moist axis in the afternoon. However, relatively low surface dewpoints and very weak instability should keep any severe threat isolated and marginal. ...Thursday/Day 6 to Saturday/Day 8... The mid-level trough in the Mississippi Valley is forecast to move eastward to the Atlantic Seaboard by Thursday night, as another trough moves into the High Plains. This second trough is forecast to move across the central U.S. on Friday, reaching the eastern U.S. on Saturday. Some moisture return is forecast late in the week in the western Gulf Coast states. Although an isolated severe threat would be possible within this moist airmass, predictability concerning any severe threat magnitude is substantial at this range. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0357 AM CDT Sat Mar 15 2025 Valid 181200Z - 231200Z ...DISCUSSION... ...Tuesday/Day 4 and Wednesday/Day 5... At mid-levels, a trough is forecast to move eastward across the central U.S. on Tuesday and Wednesday. Ahead of the system, low-level moisture is forecast to return northward into the lower to mid Mississippi Valley, with surface dewpoints reaching the 40s and 50s F. This should contribute to an axis of weak instability by Tuesday afternoon. Along and near this axis, isolated to scattered thunderstorms are expected to develop from parts of Oklahoma to Iowa. The chance for storms is expected to continue ahead of the trough, as it moves into the mid Mississippi Valley on Wednesday. A severe threat will be possible near the moist axis in the afternoon. However, relatively low surface dewpoints and very weak instability should keep any severe threat isolated and marginal. ...Thursday/Day 6 to Saturday/Day 8... The mid-level trough in the Mississippi Valley is forecast to move eastward to the Atlantic Seaboard by Thursday night, as another trough moves into the High Plains. This second trough is forecast to move across the central U.S. on Friday, reaching the eastern U.S. on Saturday. Some moisture return is forecast late in the week in the western Gulf Coast states. Although an isolated severe threat would be possible within this moist airmass, predictability concerning any severe threat magnitude is substantial at this range. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0357 AM CDT Sat Mar 15 2025 Valid 181200Z - 231200Z ...DISCUSSION... ...Tuesday/Day 4 and Wednesday/Day 5... At mid-levels, a trough is forecast to move eastward across the central U.S. on Tuesday and Wednesday. Ahead of the system, low-level moisture is forecast to return northward into the lower to mid Mississippi Valley, with surface dewpoints reaching the 40s and 50s F. This should contribute to an axis of weak instability by Tuesday afternoon. Along and near this axis, isolated to scattered thunderstorms are expected to develop from parts of Oklahoma to Iowa. The chance for storms is expected to continue ahead of the trough, as it moves into the mid Mississippi Valley on Wednesday. A severe threat will be possible near the moist axis in the afternoon. However, relatively low surface dewpoints and very weak instability should keep any severe threat isolated and marginal. ...Thursday/Day 6 to Saturday/Day 8... The mid-level trough in the Mississippi Valley is forecast to move eastward to the Atlantic Seaboard by Thursday night, as another trough moves into the High Plains. This second trough is forecast to move across the central U.S. on Friday, reaching the eastern U.S. on Saturday. Some moisture return is forecast late in the week in the western Gulf Coast states. Although an isolated severe threat would be possible within this moist airmass, predictability concerning any severe threat magnitude is substantial at this range. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0357 AM CDT Sat Mar 15 2025 Valid 181200Z - 231200Z ...DISCUSSION... ...Tuesday/Day 4 and Wednesday/Day 5... At mid-levels, a trough is forecast to move eastward across the central U.S. on Tuesday and Wednesday. Ahead of the system, low-level moisture is forecast to return northward into the lower to mid Mississippi Valley, with surface dewpoints reaching the 40s and 50s F. This should contribute to an axis of weak instability by Tuesday afternoon. Along and near this axis, isolated to scattered thunderstorms are expected to develop from parts of Oklahoma to Iowa. The chance for storms is expected to continue ahead of the trough, as it moves into the mid Mississippi Valley on Wednesday. A severe threat will be possible near the moist axis in the afternoon. However, relatively low surface dewpoints and very weak instability should keep any severe threat isolated and marginal. ...Thursday/Day 6 to Saturday/Day 8... The mid-level trough in the Mississippi Valley is forecast to move eastward to the Atlantic Seaboard by Thursday night, as another trough moves into the High Plains. This second trough is forecast to move across the central U.S. on Friday, reaching the eastern U.S. on Saturday. Some moisture return is forecast late in the week in the western Gulf Coast states. Although an isolated severe threat would be possible within this moist airmass, predictability concerning any severe threat magnitude is substantial at this range. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0357 AM CDT Sat Mar 15 2025 Valid 181200Z - 231200Z ...DISCUSSION... ...Tuesday/Day 4 and Wednesday/Day 5... At mid-levels, a trough is forecast to move eastward across the central U.S. on Tuesday and Wednesday. Ahead of the system, low-level moisture is forecast to return northward into the lower to mid Mississippi Valley, with surface dewpoints reaching the 40s and 50s F. This should contribute to an axis of weak instability by Tuesday afternoon. Along and near this axis, isolated to scattered thunderstorms are expected to develop from parts of Oklahoma to Iowa. The chance for storms is expected to continue ahead of the trough, as it moves into the mid Mississippi Valley on Wednesday. A severe threat will be possible near the moist axis in the afternoon. However, relatively low surface dewpoints and very weak instability should keep any severe threat isolated and marginal. ...Thursday/Day 6 to Saturday/Day 8... The mid-level trough in the Mississippi Valley is forecast to move eastward to the Atlantic Seaboard by Thursday night, as another trough moves into the High Plains. This second trough is forecast to move across the central U.S. on Friday, reaching the eastern U.S. on Saturday. Some moisture return is forecast late in the week in the western Gulf Coast states. Although an isolated severe threat would be possible within this moist airmass, predictability concerning any severe threat magnitude is substantial at this range. Read more