Area Forecast Discussion
Issued by NWS Hastings, NE
Issued by NWS Hastings, NE
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179 FXUS63 KGID 221747 AFDGID Area Forecast Discussion National Weather Service Hastings NE 1247 PM CDT Sat Jun 22 2024 .KEY MESSAGES... - Primary forecast concern will center around ongoing flooding today as water from overnight rainfall makes its way downstream. - There will be chances for mainly evening and overnight thunderstorms from Sunday evening through the work week with increasing chances during the late week period. - Heat returns early next week. High temperatures around 100 degrees are expected on Monday, and heat index values may exceed 105 degrees in some spots. && .DISCUSSION... Issued at 342 AM CDT Sat Jun 22 2024 Today (Ongoing Flooding Concerns)... It was a busy overnight period thanks to mainly non-severe training thunderstorms that produced heavy rainfall of 2-5 inches from Dawson County east northeastward through especially Sherman, Howard, Merrick, Nance, and Polk Counties. The runoff from this rainfall will gradually work its way through the smaller creeks and streams today into our larger rivers (Mainly the Loup) that will better be able to handle the significant volume of water. Am planning to mainly transition the Flash Flood Warnings within the Loup Basin to Flood Warnings this morning and run these warnings through much of today. With only a few river gauges it will be difficult to get a good handle on how many creeks and rivers are still flooding until we start getting some daylight. We also have one isolated thunderstorm working east across Custer County this morning, which the HRRR indicates will die off before or shortly after entering our forecast area in Sherman County. After this last isolated storm dies off, likely before dawn, then most models are dry for our forecast area over the remainder of the day. It will be just a little cooler than yesterday behind the cold front with northwesterly winds helping to keep at least our Nebraska zones down in the 80s for highs this afternoon. Sunday (Warming Back Up Then Slight Chance For Evening Thunderstorms)... The winds become southerly again and warmer 90 degree heat will return. The 06Z NAM, NAM NEST, and HRRR all develop thunderstorms across our western zones by late Sunday afternoon/evening, but these thunderstorms will be more driven by diurnal heating and will have a difficult time making it very far east into our CWA, but still could possibly reach the Tri- Cities. Monday (Hottest Day of the Week)... Breezy southerly winds will lead to a hot afternoon with highs from 97 to 103 across the forecast area and heat index values of 100 to 105 degrees. The intense diurnal heating might be enough to also kick off a few isolated evening thunderstorms that should quickly die off by late evening after we lose the diurnal heating. Tuesday through Friday (Slightly Cooler with Increasing T-Storm Chances)... It will still be hot as we head through the rest of the work week although not as bad as Monday. Weak vort maxes will rotate through bringing mainly chances for evening/overnight thunderstorms with a bigger upper trough coming through late week (Thursday Night/Friday) bringing what could be our best chance for thunderstorms although confidence is pretty low this far out. The upper ridge should remain compressed well to our south allowing for the continued off and on chances for thunderstorms. && .AVIATION /18Z TAFS THROUGH 18Z SUNDAY/... Issued at 1231 PM CDT Sat Jun 22 2024 For KGRI/KEAR Airports: MVFR conditions are ongoing at both terminals as low level clouds continue to move into the region from the north. There are some mid-level clouds moving in from the southeast, as seen on visible satellite imagery. Ceilings will bounce around over the next couple of hours as a few waves of lower clouds continue to move through. Ceilings are expected to improve to VFR late this afternoon and into this evening. North winds remain around 10-15kts for the early part of this afternoon, falling under 12kts by mid-afternoon. Overnight, winds will become light and variable, before switching to the south around 5-10kts by sunrise. Expect the possibility of a few low to mid-level clouds around sunrise, as some patchy fog or low stratus may move in. && .GID WATCHES/WARNINGS/ADVISORIES... NE...None. KS...None. && $$ DISCUSSION...Wesely AVIATION...Wekesser