Area Forecast Discussion
Issued by NWS Grand Forks, ND
Issued by NWS Grand Forks, ND
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069 FXUS63 KFGF 061743 AFDFGF Area Forecast Discussion National Weather Service Grand Forks ND 1243 PM CDT Sat Jul 6 2024 .KEY MESSAGES... - Daily shower/storm chances continue this weekend. Severe thunderstorms are unlikely at this time. Lightning and brief heavy rain are the main threats. && .UPDATE... Issued at 1243 PM CDT Sat Jul 6 2024 Showers have largely spread across all of eastern North Dakota now with greater lightning density. Further SE convective growth into west central MN early afternoon along a boundary stretching into SW MN should promote some stronger convection in the presence of >20kt bulk shear. Wind gusts of 40-50 mph and hail to 1" are the main hazards. UPDATE Issued at 925 AM CDT Sat Jul 6 2024 Showers and embedded thunder have continued to spread across eastern North Dakota from Devils Lake to Valley City with 45 mph gust at an NDAWN in NE Stutsman co showing these cells remain capable of gusty winds at the very least. Still unconvinced about severe potential this afternoon but after a few funnel reports each of the last few days and similar conditions today with the upper low won`t rule anything out quite yet. UPDATE Issued at 714 AM CDT Sat Jul 6 2024 Since about 10z...a area of t-storms developed from west of Devils Lake and from New Rockford to between Valley City and Jamestown. They are moving slowly east-northeast 10-15 kts. Brief heavy rain with them with the NDAWN near Courtenay ND in NE Stutsman county receiving 1.21 inches of rain in about an hour. Short term model radar forecasts not doing well...so not too helpful with timing. 500 mb wave in SW ND/far NW SD and will move east today and expect the continued development of showers and t-storms area wide. Scattered coverage overall. There was one mid cloud producing shower west of Osage MN at 12z and via facebook report of rain at Snellman MN. Tweeked pops a bit for this activity. && .DISCUSSION... Issued at 309 AM CDT Sat Jul 6 2024 ...Synopsis... As expected, we will see an uptick in shower and thunderstorm coverage this weekend as a 500 mb upper wave moves slowly east along the ND/SD border into northern Minnesota. 0-6 km bulk shear remains sub 20 kts this weekend and while MU CAPES reach the 1500 j/kg range both this afternoon and Sunday afternoon, storm development will remain more garden variety with small cores of heavy rain and slow movement. Small hail is possible just due to cooler air aloft, but overall storms will remain below severe limits. With upper wave moving through, brief funnels will also be possible. Will highlight a chance of small hail and brief funnels in HWO but not in public messaging at this time as let dayshift monitor to see if potential can be narrowed down in location and timing. As upper wave moves east Monday and Tuesday there will remain some weak upper level troughing and a low pop for aftn t-storms early next week. Thereafter, 500 mb ridge builds north and northeast to help at least for a while break our pattern of non-stop short wave troughs thru southern Canada to give a Wed-Fri dry period. It will be warming up...though not to unusual values....mid-upper 80s and for the first time this summer a more humid airmass with dew pts likely 65-70 range by Friday. As we head to the period Friday night and into next weekend, will have to monitor as model consensus is to break down the ridge some and put area in more westerly flow and bring some additional short waves east thru Canada. These waves riding on top of a more unstable airmass may produce t-storms. && .AVIATION /18Z TAFS THROUGH 18Z SUNDAY/... Issued at 1243 PM CDT Sat Jul 6 2024 Ceilings with afternoon convection have dropped as low as MVFR with vis dropping to 4SM at a few obs sites. Expect these conditions to periodically persist through 02Z before activity diminishes across all sites. Winds remaining light and likely becoming variable overnight through prevailing southerly if over 5kts. VFR conditions Sunday with more scattered showers. && .FGF WATCHES/WARNINGS/ADVISORIES... ND...None. MN...None. && $$ UPDATE...TT DISCUSSION...Riddle AVIATION...TT