Area Forecast Discussion
Issued by NWS Bismarck, ND
Issued by NWS Bismarck, ND
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166 FXUS63 KBIS 051508 AFDBIS Area Forecast Discussion National Weather Service Bismarck ND 1008 AM CDT Wed Jun 5 2024 .KEY MESSAGES... - Strong westerly winds today across much of North Dakota. The strongest winds today are expected in southwestern North Dakota with gusts up to 55 mph. - Breezy to wind conditions to remain through Thursday, mainly in northern and eastern portions. - Near to slightly below normal temperatures with mostly dry weather through this weekend. && .UPDATE... Issued at 1008 AM CDT Wed Jun 5 2024 Winds remain slow to increase, although are starting to increase upstream in Montana and in some western North Dakota sites. Made slight changes to wind forecast, although the Wind Advisory still remains valid for today. This afternoon could see some isolated showers develop in northern and eastern areas. There is some weak instability and modest mid level lapse rates. This could result in an isolated thunderstorm, although severe weather is not expected today. UPDATE Issued at 630 AM CDT Wed Jun 5 2024 There were some light rain showers in the east so PoPs were updated for that. The winds out west are a little slow to get to advisory level winds, but the advisory for the southwest has started. Now that the sun is fully up, the boundary layer should start mixing and winds will increase. && .DISCUSSION... Issued at 350 AM CDT Wed Jun 5 2024 Somewhat zonal flow on the south side of a stacked low system in southern Canada currently. High pressure is to our southwest in Wyoming. A tight pressure gradient force and a weak cold front this afternoon will produce very strong west winds, especially in the southwest portion of the state of North Dakota. Winds will gust as high as 55 mile per hour. We decided to go with an advisory instead of a high wind warning because only a few locations in the southwest could mix winds higher than 55 mile per hour, and we just didn`t have the confidence in widespread 60 mile per hour winds to do a warning. So, we have a two part Wind Advisory. The southwest portion starts at 10z and the rest of the county warning area starts a little bit later in the morning at 15z. The Wind Advisory (both parts) will expire at 02z. However it will remain breezy through the night, so make sure you keep your objects secured still. This is because the high pressure bubble will move west to east across the state, starting right now. The west has already started gusting at 30 mile per hour, at the time of this issuance of the area forecast discussion. Thursday will be breezy, but the winds will not be gusting as high, just around 40 mile per hour in the east, and around 30 elsewhere. Temperatures today will be below average again thanks to the northwest surface flow and the cold front already mentioned. Aloft the flow will turn northwest with a large ridge building around the Four Corners High pressure in the Southwest CONUS. This ridge will last through the weekend with no push of warm air to North Dakota by the thermal ridge. It stays mostly south of here. So, even though we will have ridging, the high temperatures everyday will stay at or below average through this weekend. There will be slight (20 percent) chances for thunderstorms in the far northeast, where the cyclonic flow is still existing. The chances are this afternoon, and Friday afternoon. After Saturday the flow aloft changes slightly. We still have the ridge but now it is compressed by an upper level low in southern Canada. Temperatures will cool even more for Sunday as zonal westerly flow is over North Dakota. It is not until Monday for when rain chances are possible with this low. A cold front and shortwave rotating around the low move through. For now we just have slight (15 percent) chances moving west to east across the state Monday. Another ridge looks to move in mid-week. This one is smaller and quick moving, but it will bring warmer 850 millibar temperatures. So highs Tuesday and Wednesday look to be above normal in the upper 70s and mid 80s. && .AVIATION /12Z TAFS THROUGH 12Z THURSDAY/... Issued at 630 AM CDT Wed Jun 5 2024 VFR and very windy. Westerly winds gusting to 45 kts are possible today across most of western and central ND. Clouds around 8kft will move into the north central and east this afternoon, sticking around until Thursday morning. LLWS is possible around 10z Thursday but left it out for now. && .BIS WATCHES/WARNINGS/ADVISORIES... Wind Advisory until 9 PM CDT /8 PM MDT/ this evening for NDZ001>005-009>013-017>023-025-031>037-040>048-050-051. && $$ UPDATE...Anglin DISCUSSION...Smith AVIATION...Smith