Weather Alerts For Clarksville, IA

# SUMMARY -------------------- - Severe Thunderstorm Watch for portions of Central Iowa Northeast Kansas Northwest Missouri - Effective this Thursday afternoon from 555 PM until Midnight CDT. - Primary threats include... Scattered damaging wind gusts to 70 mph likely Scattered large hail and isolated very large hail events to 2 inches in diameter possible A tornado or two possible # DETAILS -------------------- SUMMARY - A line of intense storms extending from northeast Kansas into central Iowa will track eastward across the watch area through the evening. The strongest cells will pose a risk of damaging winds and hail. A tornado or two is also possible. - The severe thunderstorm watch area is approximately along and 50 statute miles east and west of a line from 35 miles northeast of Mason City IA to 50 miles south southeast of Olathe KS. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU8). AVIATION A few severe thunderstorms with hail surface and aloft to 2 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 25030. ISSUED AT The NWS Storm Prediction Center has issued a ISSUED BY 659 PM CDT Thu Apr 23 2026 HEADER Watch county notification for watches 134/138 | National Weather Service Des Moines IA # 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.

Closest strike: 0.52 miles Stay Alert! Remain in a safe area until there has been no lightning within 10 miles of this location for 30 minutes. Please be aware that lightning activity can remain high even when a storm is moving away from your location. Even if rain has stopped, do not leave your safe area until WeatherBug indicates that lightning is more than 10 miles away from this selected location. IF OUTDOORS Avoid water, high ground, and open spaces. Avoid all metal objects including electric wires, fences, and machinery. Find a safe area in a building or in a fully enclosed vehicle with the windows completely shut. Unsafe places include underneath canopies, small picnic or rain shelters, convertibles, or near trees. IF INDOORS Avoid water and stay away from doors and windows. Avoid using a hard line telephone. Take off headphones. Turn off, unplug, and stay away from appliances, computers, power tools, and TV sets. Lightning may strike exterior electric and phone lines, inducing shocks to inside equipment.

There is a Slight Severe Storm Risk for your location. Continue reading for today's outlook from the National Weather Service's Storm Prediction Center. -------------------- National Severe Storm Outlook THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS ARTS OF EASTERN KANSAS AND NORTHERN OKLAHOMA SUMMARY Scattered severe thunderstorms will continue this evening from parts of the southern and central Plains north-northeastward into the lower Missouri and upper Mississippi Valleys. Tornadoes, large hail and severe wind gusts are expected. Southern and Central Plains Latest water vapor imagery shows an upper-level trough over the Great Plains, with an associated mid-level jet streak moving through the base of the trough into the southern Plains. At the surface, a cold front is advancing southeastward across far southeast Nebraska, east-central Kansas and far northern Oklahoma. Ahead of the front, multiple line segments are ongoing. These broken lines are embedded with discrete to semi-discrete supercells. The storms are located along an axis of moderate to strong instability, with the RAP showing MLCAPE in the 2500 to 3500 J/kg range. Over the top of this moist and unstable airmass, flow is westerly around 50 knots. This is creating moderate to strong deep-layer shear which will continue to support supercells this evening. Steep mid-level lapse rates approaching 8 C/km will be favorable for large hail. In addition, the western edge of a 40 to 50 knot low-level jet will remain in place over eastern Kansas. WSR-88D VWPs that are sampling the low-level jet have 0-3 km storm-relative helicity in the 400 to 450 m2/s2 range, which will support a continued tornado threat. In addition, a threat for wind damage will also continue through the mid to late evening...see MCD 510. Lower Missouri Valley/Upper Mississippi Valley Southwesterly mid-level flow is in place over much of the north-central U.S. At the surface, a cold front is located from central Minnesota south-southwestward into the mid Missouri Valley. A line of strong to severe thunderstorms is ongoing ahead of the front from far southeastern Minnesota into central Iowa and far northwestern Missouri. Moderate instability is analyzed ahead of the line, with the RAP showing MLCAPE in the 1500 to 2000 J/kg range. The thermodynamic environment will continue to be favorable for isolated large hail. In addition, a 40 to 50 knot jet is analyzed over east-central Iowa. As the low-level jet strengthens, tornadoes will be possible with rotating cells embedded in the line. As the line continues to move eastward through the mid to late evening, wind damage will be possible with embedded supercells and bowing line segments.

Pollen Index: 11.6 Pollen Level: high Predominant Pollen: Elm, Poplar/Aspen/Cottonwood and Maple. Concentration of pollen grains in the air for Friday will be falling but will remain in the high range. This forecast of lower pollen concentration is based on falling temperatures and heavy rains in the morning and evening which tend to wash pollen out of the air. That's good news for allergy sufferers.