Weather Alerts For Saint Peters, MO

Closest strike: 1.41 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 A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM THE LOWER MISSOURI VALLEY INTO THE SOUTHERN GREAT LAKES SUMMARY Scattered severe thunderstorms capable of large hail and damaging wind gusts are possible across portions of the Midwest this afternoon into tonight. A conditional threat for severe storms with large to very large hail extends into portions of the central/southern Plains. IL into the southern Great Lakes A mid-level vorticity maximum over the lower MO Valley is forecast to move east across IL through the late afternoon and into IN-OH tonight. An associated speed maximum at 700 mb will intensify and overspread IL (40-50 kt) east into the southern Great Lakes while a pronounced strengthening of 850-mb flow (50 kt) occurs during the 21-03z period. Cold mid-level temperatures (-18 deg C at 500 mb) will act to offset initially meager moisture. Model guidance varies considerably regarding moisture quality with ample spread amongst different model cores/PBL schemes. However, it seems a narrow corridor of lower to mid 50s surface dewpoints will extend east-northeast from the lower MO Valley into the southern Great Lakes by mid to late afternoon. Forecast soundings show weak to moderate buoyancy (500-1250 J/kg MLCAPE). Morning model guidance shows widely scattered to scattered storms developing within the warm conveyor during peak heating as convective inhibition erodes. Have expanded the Slight Risk farther east into this region to account for a hail/wind risk with the stronger storms. Uncertainty remains regarding quality of boundary-layer moisture across the northern third of IN into northwest OH where hodographs become enlarged later this afternoon into the early evening. Will re-evaluate the tornado risk for the 20 UTC outlook if in fact moisture quality seems sufficient for a focused, short-duration tornado risk across the aforementioned corridor. Eastern KS into the Mid MS Valley Thunderstorm development is anticipated during the afternoon along a cold forecast to extend through southern WI and eastern/southern IA. Thunderstorms along the front will initially be displaced north of the better shear and buoyancy, so somewhat transient updraft structures and/or frontal undercutting will likely limit storm severity. Even so, high cloud bases and a deeply mixed boundary layer could result in a few strong gusts. Later in the evening, more storm development appears likely on the front as it moves into eastern KS and northern/central MO. Here, stronger shear and buoyancy should support more robust updrafts and a relatively higher probability for severe storms. Large to very large hail is the primary risk. Central Kansas into Oklahoma and northern Texas A dryline will extend from central KS south-southwestward into northwest TX by mid afternoon as a surface low evolves near the TX Panhandle/OK/KS border region. Strong diurnal heating will likely erode most convective inhibition by the early evening, while steep lapse rates contribute to moderate buoyancy along the dryline. Isolated thunderstorms are possible on the dryline from central KS into northwest TX during the 22-02 UTC period. Veering and strengthening flow with height beneath 100-kt westerly 200-mb flow will support supercells. Isolated large to very large hail will be the primary risk with the stronger storms, although severe gusts are also possible.

Pollen Index: 9.9 Pollen Level: high Predominant Pollen: Oak, Ash and Mulberry. Pollen concentrations for Tuesday will be falling into the very low range. This forecast of lower pollen concentration is based on falling temperatures, rising humidity and heavy rains in the morning and afternoon which tend to wash pollen out of the air.