Area Forecast Discussion
Issued by NWS Omaha/Valley, NE
Issued by NWS Omaha/Valley, NE
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891 FXUS63 KOAX 170919 AFDOAX Area Forecast Discussion National Weather Service Omaha/Valley NE 419 AM CDT Fri May 17 2024 .KEY MESSAGES... - Hot temperatures today with highs near 90. A bit cooler on Saturday though dry weather continues. - Increased chances for thunderstorms beginning early Sunday and lasting through at least Tuesday. Severe weather will be possible at times, especially Sunday evening and Monday. - The repeated rounds of storms may bring a threat of flash flooding. && .DISCUSSION... Issued at 419 AM CDT Fri May 17 2024 We have mostly clear skies across the area this morning with temperatures in the mid 50s to low 60s. Winds are out of the south but fairly light. We`ll see increasing winds out of the southwest through this afternoon with temperatures jumping up into the upper 80s to around 90 this afternoon as a shortwave passes through ramping up low-level winds. Increased southerly flow and little-to-no cloud cover should allow for excellent mixing which could allow temperatures to even overachieve, so have leaned on the higher side of guidance for temperatures this afternoon. Saturday morning we`ll see a cold front move across the Upper Plains as an upper-level shortwave trough moves across the region. The southwesterly flow regime ahead of this system will keep us too dry for any precipitation with this cold front, but we will see high temperatures drop down into the upper 70s to mid 80s and winds shift to northwesterly. The shortwave trough on Saturday sets us up for a very active pattern going into early next week with a shift to a southwesterly upper-level flow regime. This will bring a strong system through Sunday, with another system on it`s tail moving through on Monday. We see a ramp up of southerly moisture advection out ahead of these systems starting across central Nebraska overnight Saturday night into early Sunday. The low- level jet expands precip chances eastward by Sunday morning, with chances for strong to severe storms Sunday evening as we see a dry line move across the area. Monday we see the surface low move through, likely just to our southeast, which may limit the severe potential to far southeast Nebraska and southwest Iowa. Tuesday temperatures will be a bit cooler as we see a transition from northerly flow behind the Monday front to easterly flow out ahead of the next shortwave. We see the associated surface low track either across eastern Nebraska or northwest Missouri. A more northerly track of the surface low would mean another chance for severe storms Tuesday afternoon and evening. Wednesday, the ensembles start to diverge but we continue to see low chances for showers and storms. We keep these low PoPs and temperatures in the upper 70s to low 80s through Thursday. && .AVIATION /00Z TAFS THROUGH 00Z SATURDAY/... Issued at 936 PM CDT Thu May 16 2024 VFR conditions are expected with mostly clear skies throughout the period and light southerly winds becoming southwesterly Friday morning. Gusts will increase to near 25 kts by Friday afternoon. A few passing mid and high clouds are possible Friday afternoon. && .OAX WATCHES/WARNINGS/ADVISORIES... NE...None. IA...None. && $$ DISCUSSION...McCoy AVIATION...Kern