Severe Weather: July 10

3:50 PM Update: The thunderstorm threat has diminished for the state of Iowa as of latest radar updates. The extreme northeast corner of Iowa may be affected shortly by a strong bow echo storm that is tracking out of southeastern Minnesota. The SPC has also stated in discussions that portions of northeast and north-central Iowa may also be put under another severe thunderstorm watch later this afternoon. Additional development is likely and the risk for severe weather if storms develop is fairly high.

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3:05 PM Update: The Iowa State Patrol has reported a tornado that was located west of Elvira, IA as of 3:01 PM. This tornado is moving to the southeast at ~30 mph.

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3:03 Update: Severe and Tornadic thunderstorms are moving east/southeast near and just north of the Davenport, IA area. Large hail and damaging winds are likely, from Clinton through Scott counties. The tornadic threat is currently limited to an area near the highway 30 corridor in Clinton county to the east of DeWitt. The towns of Low Moor and Camanche are both in the path of the potentially tornadic storm. These storms should move east out of Iowa within the next half hour.

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2:46 PM Update: A tornado has been reported to be on the ground, just north of DeWitt, IA associated with the storm that is going to continue to effect Clinton county. This storm will move to the southeast at 25 mph...

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1:20 PM Update: The tornado warning for Jones county continues to be in effect, here is the latest from the NWS:

AT 114 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A POSSIBLE TORNADO. THIS TORNADO WAS LOCATED APPROXIMATELY
NEAR PICTURED ROCKS WILDLIFE MANAGEMENT AREA...OR 13 MILES NORTHEAST
OF ANAMOSA...MOVING EAST AT 24 MPH.

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12:40 PM Update: Shortly after stating that this storm doesn't appear to be tornadic, Davenport NWS has issued a tornado warning for Jones/Linn/Delaware counties in eastern Iowa. Rotation has been noted on radar, along with a small reflectivity hook has prompted this warning. Currently, no reports have been received from this storm other than large hail.

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12:25 PM Update: A severe thunderstorm capable of producing up to golf ball sized hail was located over Delaware county. This storm is moving to the east at 20 mph, and should begin to enter portions of Dubuque county shortly. This storm is a supercell, thus will likely continue to threaten the areas with large hail and damaging winds. This storm has shown characteristics of possible rotation in the lower levels, however, at this time it does not appear that the storm will be tornadic.

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10:45 AM Update: Although not completely expected, a severe weather threat is likely to affect a large portion of the state this afternoon/evening across Iowa. Currently, thunderstorms are still lingering over parts of eastern Iowa after morning convection in northwestern Iowa. The clouds are now clearing in western Iowa behind this system, which should provide this area with plenty of instability for this afternoons potential round of thunderstorms. North of the state, thunderstorms associated with a weak wave are ongoing with a severe thunderstorm watch until 1 PM for portions of the eastern Dakotas and western Minnesota.

These thunderstorms that are in eastern Iowa should continue to move off into portions of southern Wisconsin and Illinois. Expect them to clear the Iowa border by mid afternoon, with the cloud cover exiting shortly after given no other convection or cloud cover is moving in.

The main severe threat for the state will come this afternoon with upscale development of storms along the current wave in Minnesota. Those associated thunderstorms are struggling to continue, however, with the large scale features it should continue to expand east/southeastward for the remainder of the morning and early afternoon. As these storms reach southward they should begin to enter a better environment, with more moisture and heating allowing for substantial instability. This will allow storms to post a threat for both large hail, and damaging winds through the mid and late afternoon hours. The SPC has already issued a discussion stating such an evolution, and that a severe thunderstorm watch may be needed for portions of northern Iowa, and southern Minnesota, in the next few hours.

Future updates will address the potential severe threat and storm evolution as it enters Iowa. Radar updates are being shown on the Iowa Chaser Homepage.