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Numerous severe thunderstorms are expected this afternoon into tonight, with the peak threat centered over Illinois and Indiana. Intense tornadoes, swaths of damaging gusts over 75 mph and damaging wind-driven large hail will all be possible.
← back to overviewSPC AC 171628
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1128 AM CDT Wed Jun 17 2026
Valid 171630Z - 181200Z
THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF ILLINOIS AND INDIANA
### THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS TONIGHT OVER SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI
### SUMMARY
Numerous severe thunderstorms are expected this afternoon into tonight, with the peak threat centered over Illinois and Indiana. Intense tornadoes, swaths of damaging gusts over 75 mph and damaging wind-driven large hail will all be possible.
MO/IL/IN
An intense and fast-moving shortwave trough continues to approach the Midwest today, with an associated 90+ knot mid level jet streaking across the region. A very strong southerly low-level jet precedes this trough, and has resulted in widespread thunderstorms over central IL. The effects of this early convection will be important to the mesoscale details of where the main risk of severe storms will develop later today.
The primary outflow boundary from ongoing storms currently extends from extreme northeast MO into south-central IL, and continues to sag southward. Strong heating is occurring to the south of the boundary, and given the intense low-level flow, some northward return is expected. However, it appears unlikely to substantially destabilize as far north as earlier forecasts. The zone in vicinity of the boundary will become very unstable by mid-late afternoon, with forecast soundings continuing to show impressive shear values and hodograph structures suggestive of tornadic supercell potential. Very large hail and damaging winds will also be possible with this activity as it tracks quickly eastward into central IN. Strong tornadoes are possible.
By mid-evening, a line of severe storms will likely extend from central MO into southern IN, with damaging winds becoming the primary threat.
Southeast MN
A small area of heating/destabilization has developed near the surface low over southern MN. Cold temperatures aloft and strong deep-layer shear suggests a threat of a few severe storms capable of hail and gusty/damaging winds this afternoon.
LA/MS
Tropical Storm Arthur will track northward and affect LA and southern MS tonight. A zone of strong southerly low-level winds to the east of the circulation will result in some concern for overnight and pre-dawn tornadoes across southeast LA into far southern MS.
Southern AZ/NM
Scattered afternoon and evening thunderstorms are expected across southeast AZ and southwest NM. Strong heating and ample instability will pose a risk of damaging wind gusts in the strongest cells.
..Hart/Chalmers.. 06/17/2026
CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 2000Z
Isolated to scattered severe thunderstorms will be possible from Kentucky to the Mid-Atlantic, and across parts of the Northeast. Damaging wind gusts will be the main hazard with this activity.
← back to overviewSPC AC 171723
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1223 PM CDT Wed Jun 17 2026
Valid 181200Z - 191200Z
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM CENTRAL KENTUCKY INTO THE MID-ATLANTIC AND PORTIONS OF NEW ENGLAND
### SUMMARY
Isolated to scattered severe thunderstorms will be possible from Kentucky to the Mid-Atlantic, and across parts of the Northeast. Damaging wind gusts will be the main hazard with this activity.
Synopsis
A potent upper trough and associated mid-level jet streak will move into the northern Mid-Atlantic/New England Thursday morning. A deep surface low moving through southern Ontario/Quebec will drive a surface cold front through the regions. This front will extend southwestward into the Ohio Valley/southern Appalachians and parts of the central/southern Plains. The remnants of what is now Tropical Storm Arthur will continue through parts of the Southeast.
New England/Mid-Atlantic
Convection will likely be ongoing ahead of the upper trough during the morning, particularly from eastern New York into New England. While this activity is likely to inhibit afternoon destabilization, strong wind fields will still promote some risk for damaging winds and perhaps a brief tornado. The strongest activity will develop by early afternoon along the cold front and progress eastward. Bowing segments and marginal supercell structures will be possible. The strong low-level jet will be shifting eastward during the day, but portions of New England will still have strong 850 mb winds during the early/mid afternoon. If sufficient heating occurs, this is where the tornado risk will be marginally greater.
Kentucky/West Virginia/Virginia
Stronger instability is expected south of the surface front on account of richer low-level moisture. Scattered storms are expected to form along the front by mid afternoon. Though the low-level jet will weaken much quicker in these areas, deep-layer shear near the front will remain sufficient for organized cells and linear segments. These storms will move eastward through the afternoon and pose a risk of damaging wind gusts.
Southern Plains into Ozarks
Elevated convection may be ongoing early in the period near and north of the cold front in southern Kansas/southwest Missouri. These storms could produce large hail. With time, the front will sag southward. Strong heating of a 70+ F dewpoint airmass will potentially promote afternoon thunderstorms capable of marginally severe hail and isolated severe gusts. During the evening, additional thunderstorms may develop as a modest increase in the low-level jet occurs. Some guidance suggests this activity may cluster into a small MCS within western Oklahoma/northwest Texas. Where and if this occurs is not certain. Some risk for severe gusts could extent into the evening if this occurs.
Southeast
The remnants of Tropical Storm Arthur will move through a very moist (70+ F dewpoints) airmass. Local shear magnitudes will be modestly enhanced by the remnant circulation. Scattered convection will be capable of wind damage and perhaps a tornado or two. Portions of Georgia may see greater surface heating ahead of the circulation. A few stronger storms are possible here. Even so, poor mid-level lapse rates and deep-layer shear (especially away from the circulation center) will limit the overall severe threat.
..Wendt.. 06/17/2026
CLICK TO GET WUUS02 PTSDY2 PRODUCT
NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED BY 0600Z
Isolated strong thunderstorms may produce damaging wind gusts across portions of the Gulf Coast states/Southeast on Friday.
← back to overviewSPC AC 170639
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0139 AM CDT Wed Jun 17 2026
Valid 191200Z - 201200Z
THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE SOUTHEAST
### SUMMARY
Isolated strong thunderstorms may produce damaging wind gusts across portions of the Gulf Coast states/Southeast on Friday.
Southeast
A series of mid/upper shortwave impulses will migrate across the Gulf Coast states/Southeast on Friday. Forecast guidance depicts fairly strong 850 mb flow across the region early in the day, and lifting shifting offshore from the Carolinas by late afternoon. While 850-700 mb flow will be enhanced, vertical shear will be modest. Nevertheless, convection will develop within a very moist airmass amid moderate to strong instability ahead of a southward sagging front. Isolated strong/damaging gusts will be possible with this activity.
..Leitman.. 06/17/2026
CLICK TO GET WUUS03 PTSDY3 PRODUCT
NOTE: THE NEXT DAY 3 OUTLOOK IS SCHEDULED BY 1930Z
You are looking at an outlook that is part of the medium range forecast (the outlook for days 4-8). The most important thing to note is that lack of a risk does not mean zero risk. Generally speaking, confidence has to be pretty high for the Storm Prediction Center to have an outlook area this far into the future.
When no specific risk areas are shown, you might see one of these phrases:
If you bookmark this page, it will continue to update with each new outlook that is issued.
| Day 4 | Saturday, June 20 | 15% |
| Day 5 | Sunday, June 21 | predictability too low |
| Day 6 | Monday, June 22 | predictability too low |
| Day 7 | Tuesday, June 23 | predictability too low |
| Day 8 | Wednesday, June 24 | predictability too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 170721 SPC AC 170721
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0221 AM CDT Wed Jun 17 2026
Valid 201200Z - 251200Z
DISCUSSION
Day 4/Saturday - Central Plains
A mid/upper trough ejecting across the central Rockies into the Plains will break down the upper ridge centered over the Plains on Saturday. This will result in some enhancement of mid/upper level west/northwesterly flow. Surface lee troughing will extend from eastern WY through eastern CO, and increasing south/southeasterly low-level flow will transport 60s F dewpoints northward into NE and far southwest SD. Increasing boundary layer moisture and steepening midlevel lapse rates will support moderate destabilization by late afternoon and evening. Thunderstorms are expected to develop by 21-00z and migrate southeast, posing a severe risk across portions of the central Plains.
Day 5/Sunday - OK/KS into the Mid-MS Valley
Medium range guidance varies considerably regarding evolution of a modest midlevel shortwave trough and associated surface low and cold front on Sunday. It is possible that an MCS related to Day 4/Saturday convection could be ongoing Sunday morning somewhere near the Mid-MO Valley. Depending on how surface feature evolve, a severe risk could develop across parts of eastern OK/KS into the Mid-MS Valley given a seasonally moist/unstable airmass and at least some enhancement of deep-layer flow from the mid/upper shortwave trough. However, placement of the surface low Sunday morning varies by a few hundred miles between the ECMWF and GFS deterministic members. The AIGFS is more similar to the ECMWF, but details remain quite different. This precludes a 15 percent delineation at this time, but probabilities may be needed at some point somewhere from OK/KS into the Mid-MS Valley/Mid-South regions.
Days 6-8/Monday-Wednesday
A more June-like pattern appears to evolve through mid-week with weaker deep-layer flow expected amid weak troughing in the East and upper ridging across the West. Some severe thunderstorm potential could develop across the Plains as low-level moisture spreads northward beneath modest northwesterly flow aloft. However, predictability is low given a lack of stronger large-scale ascent. Daily thunderstorm chances will be driven by mesoscale processes not well resolved at longer time scale.
..Leitman.. 06/17/2026
CLICK TO GET WUUS48 PTSD48 PRODUCT
You are looking at an outlook that is part of the medium range forecast (the outlook for days 4-8). The most important thing to note is that lack of a risk does not mean zero risk. Generally speaking, confidence has to be pretty high for the Storm Prediction Center to have an outlook area this far into the future.
When no specific risk areas are shown, you might see one of these phrases:
If you bookmark this page, it will continue to update with each new outlook that is issued.
| Day 4 | Saturday, June 20 | 15% |
| Day 5 | Sunday, June 21 | predictability too low |
| Day 6 | Monday, June 22 | predictability too low |
| Day 7 | Tuesday, June 23 | predictability too low |
| Day 8 | Wednesday, June 24 | predictability too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 170721 SPC AC 170721
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0221 AM CDT Wed Jun 17 2026
Valid 201200Z - 251200Z
DISCUSSION
Day 4/Saturday - Central Plains
A mid/upper trough ejecting across the central Rockies into the Plains will break down the upper ridge centered over the Plains on Saturday. This will result in some enhancement of mid/upper level west/northwesterly flow. Surface lee troughing will extend from eastern WY through eastern CO, and increasing south/southeasterly low-level flow will transport 60s F dewpoints northward into NE and far southwest SD. Increasing boundary layer moisture and steepening midlevel lapse rates will support moderate destabilization by late afternoon and evening. Thunderstorms are expected to develop by 21-00z and migrate southeast, posing a severe risk across portions of the central Plains.
Day 5/Sunday - OK/KS into the Mid-MS Valley
Medium range guidance varies considerably regarding evolution of a modest midlevel shortwave trough and associated surface low and cold front on Sunday. It is possible that an MCS related to Day 4/Saturday convection could be ongoing Sunday morning somewhere near the Mid-MO Valley. Depending on how surface feature evolve, a severe risk could develop across parts of eastern OK/KS into the Mid-MS Valley given a seasonally moist/unstable airmass and at least some enhancement of deep-layer flow from the mid/upper shortwave trough. However, placement of the surface low Sunday morning varies by a few hundred miles between the ECMWF and GFS deterministic members. The AIGFS is more similar to the ECMWF, but details remain quite different. This precludes a 15 percent delineation at this time, but probabilities may be needed at some point somewhere from OK/KS into the Mid-MS Valley/Mid-South regions.
Days 6-8/Monday-Wednesday
A more June-like pattern appears to evolve through mid-week with weaker deep-layer flow expected amid weak troughing in the East and upper ridging across the West. Some severe thunderstorm potential could develop across the Plains as low-level moisture spreads northward beneath modest northwesterly flow aloft. However, predictability is low given a lack of stronger large-scale ascent. Daily thunderstorm chances will be driven by mesoscale processes not well resolved at longer time scale.
..Leitman.. 06/17/2026
CLICK TO GET WUUS48 PTSD48 PRODUCT
You are looking at an outlook that is part of the medium range forecast (the outlook for days 4-8). The most important thing to note is that lack of a risk does not mean zero risk. Generally speaking, confidence has to be pretty high for the Storm Prediction Center to have an outlook area this far into the future.
When no specific risk areas are shown, you might see one of these phrases:
If you bookmark this page, it will continue to update with each new outlook that is issued.
| Day 4 | Saturday, June 20 | 15% |
| Day 5 | Sunday, June 21 | predictability too low |
| Day 6 | Monday, June 22 | predictability too low |
| Day 7 | Tuesday, June 23 | predictability too low |
| Day 8 | Wednesday, June 24 | predictability too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 170721 SPC AC 170721
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0221 AM CDT Wed Jun 17 2026
Valid 201200Z - 251200Z
DISCUSSION
Day 4/Saturday - Central Plains
A mid/upper trough ejecting across the central Rockies into the Plains will break down the upper ridge centered over the Plains on Saturday. This will result in some enhancement of mid/upper level west/northwesterly flow. Surface lee troughing will extend from eastern WY through eastern CO, and increasing south/southeasterly low-level flow will transport 60s F dewpoints northward into NE and far southwest SD. Increasing boundary layer moisture and steepening midlevel lapse rates will support moderate destabilization by late afternoon and evening. Thunderstorms are expected to develop by 21-00z and migrate southeast, posing a severe risk across portions of the central Plains.
Day 5/Sunday - OK/KS into the Mid-MS Valley
Medium range guidance varies considerably regarding evolution of a modest midlevel shortwave trough and associated surface low and cold front on Sunday. It is possible that an MCS related to Day 4/Saturday convection could be ongoing Sunday morning somewhere near the Mid-MO Valley. Depending on how surface feature evolve, a severe risk could develop across parts of eastern OK/KS into the Mid-MS Valley given a seasonally moist/unstable airmass and at least some enhancement of deep-layer flow from the mid/upper shortwave trough. However, placement of the surface low Sunday morning varies by a few hundred miles between the ECMWF and GFS deterministic members. The AIGFS is more similar to the ECMWF, but details remain quite different. This precludes a 15 percent delineation at this time, but probabilities may be needed at some point somewhere from OK/KS into the Mid-MS Valley/Mid-South regions.
Days 6-8/Monday-Wednesday
A more June-like pattern appears to evolve through mid-week with weaker deep-layer flow expected amid weak troughing in the East and upper ridging across the West. Some severe thunderstorm potential could develop across the Plains as low-level moisture spreads northward beneath modest northwesterly flow aloft. However, predictability is low given a lack of stronger large-scale ascent. Daily thunderstorm chances will be driven by mesoscale processes not well resolved at longer time scale.
..Leitman.. 06/17/2026
CLICK TO GET WUUS48 PTSD48 PRODUCT
You are looking at an outlook that is part of the medium range forecast (the outlook for days 4-8). The most important thing to note is that lack of a risk does not mean zero risk. Generally speaking, confidence has to be pretty high for the Storm Prediction Center to have an outlook area this far into the future.
When no specific risk areas are shown, you might see one of these phrases:
If you bookmark this page, it will continue to update with each new outlook that is issued.
| Day 4 | Saturday, June 20 | 15% |
| Day 5 | Sunday, June 21 | predictability too low |
| Day 6 | Monday, June 22 | predictability too low |
| Day 7 | Tuesday, June 23 | predictability too low |
| Day 8 | Wednesday, June 24 | predictability too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 170721 SPC AC 170721
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0221 AM CDT Wed Jun 17 2026
Valid 201200Z - 251200Z
DISCUSSION
Day 4/Saturday - Central Plains
A mid/upper trough ejecting across the central Rockies into the Plains will break down the upper ridge centered over the Plains on Saturday. This will result in some enhancement of mid/upper level west/northwesterly flow. Surface lee troughing will extend from eastern WY through eastern CO, and increasing south/southeasterly low-level flow will transport 60s F dewpoints northward into NE and far southwest SD. Increasing boundary layer moisture and steepening midlevel lapse rates will support moderate destabilization by late afternoon and evening. Thunderstorms are expected to develop by 21-00z and migrate southeast, posing a severe risk across portions of the central Plains.
Day 5/Sunday - OK/KS into the Mid-MS Valley
Medium range guidance varies considerably regarding evolution of a modest midlevel shortwave trough and associated surface low and cold front on Sunday. It is possible that an MCS related to Day 4/Saturday convection could be ongoing Sunday morning somewhere near the Mid-MO Valley. Depending on how surface feature evolve, a severe risk could develop across parts of eastern OK/KS into the Mid-MS Valley given a seasonally moist/unstable airmass and at least some enhancement of deep-layer flow from the mid/upper shortwave trough. However, placement of the surface low Sunday morning varies by a few hundred miles between the ECMWF and GFS deterministic members. The AIGFS is more similar to the ECMWF, but details remain quite different. This precludes a 15 percent delineation at this time, but probabilities may be needed at some point somewhere from OK/KS into the Mid-MS Valley/Mid-South regions.
Days 6-8/Monday-Wednesday
A more June-like pattern appears to evolve through mid-week with weaker deep-layer flow expected amid weak troughing in the East and upper ridging across the West. Some severe thunderstorm potential could develop across the Plains as low-level moisture spreads northward beneath modest northwesterly flow aloft. However, predictability is low given a lack of stronger large-scale ascent. Daily thunderstorm chances will be driven by mesoscale processes not well resolved at longer time scale.
..Leitman.. 06/17/2026
CLICK TO GET WUUS48 PTSD48 PRODUCT
You are looking at an outlook that is part of the medium range forecast (the outlook for days 4-8). The most important thing to note is that lack of a risk does not mean zero risk. Generally speaking, confidence has to be pretty high for the Storm Prediction Center to have an outlook area this far into the future.
When no specific risk areas are shown, you might see one of these phrases:
If you bookmark this page, it will continue to update with each new outlook that is issued.
| Day 4 | Saturday, June 20 | 15% |
| Day 5 | Sunday, June 21 | predictability too low |
| Day 6 | Monday, June 22 | predictability too low |
| Day 7 | Tuesday, June 23 | predictability too low |
| Day 8 | Wednesday, June 24 | predictability too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 170721 SPC AC 170721
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0221 AM CDT Wed Jun 17 2026
Valid 201200Z - 251200Z
DISCUSSION
Day 4/Saturday - Central Plains
A mid/upper trough ejecting across the central Rockies into the Plains will break down the upper ridge centered over the Plains on Saturday. This will result in some enhancement of mid/upper level west/northwesterly flow. Surface lee troughing will extend from eastern WY through eastern CO, and increasing south/southeasterly low-level flow will transport 60s F dewpoints northward into NE and far southwest SD. Increasing boundary layer moisture and steepening midlevel lapse rates will support moderate destabilization by late afternoon and evening. Thunderstorms are expected to develop by 21-00z and migrate southeast, posing a severe risk across portions of the central Plains.
Day 5/Sunday - OK/KS into the Mid-MS Valley
Medium range guidance varies considerably regarding evolution of a modest midlevel shortwave trough and associated surface low and cold front on Sunday. It is possible that an MCS related to Day 4/Saturday convection could be ongoing Sunday morning somewhere near the Mid-MO Valley. Depending on how surface feature evolve, a severe risk could develop across parts of eastern OK/KS into the Mid-MS Valley given a seasonally moist/unstable airmass and at least some enhancement of deep-layer flow from the mid/upper shortwave trough. However, placement of the surface low Sunday morning varies by a few hundred miles between the ECMWF and GFS deterministic members. The AIGFS is more similar to the ECMWF, but details remain quite different. This precludes a 15 percent delineation at this time, but probabilities may be needed at some point somewhere from OK/KS into the Mid-MS Valley/Mid-South regions.
Days 6-8/Monday-Wednesday
A more June-like pattern appears to evolve through mid-week with weaker deep-layer flow expected amid weak troughing in the East and upper ridging across the West. Some severe thunderstorm potential could develop across the Plains as low-level moisture spreads northward beneath modest northwesterly flow aloft. However, predictability is low given a lack of stronger large-scale ascent. Daily thunderstorm chances will be driven by mesoscale processes not well resolved at longer time scale.
..Leitman.. 06/17/2026
CLICK TO GET WUUS48 PTSD48 PRODUCT
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