textproduct: Gaylord

KEY MESSAGES

- Still warm and humid today, but not quite as bad as earlier this week

- Showers/storms possible today; any could produce torrential rain, and a few could become strong to severe.

- Showers/storms possible on Independence Day

DISCUSSION

Issued at 347 AM EDT Fri Jul 3 2026

PATTERN SYNOPSIS/FORECAST:

Trough west, ridge east upper level configuration still holding on...as NW flow off the Pacific injects some additional trough energy out west (though the broader trough is very messy, with lots of shortwave niblets). Ridging still holding firm over northern Canada with that omega-y look up there...though trough axis over eastern central Canada is becoming elongated as it gets pinched between northerly flow off Hudson Bay and southwesterly flow through the Upper Midwest...with a bit of a col region over the southern Canadian Prairies. 596dm 500mb ridge centered over eastern KY with some convection bubbling beneath it...though bulk of the convection is developing along the feed of Gulf moisture tracking from TX up into the Upper Great Lakes, along the perimeter of the ridge. Steep lapse rates aloft remain in place over the western and central portions of the continent where EMLs prevail; some steeper lapse rates trapped over the OH Valley beneath the hot ridge axis, which may be a bit of a boon to convection to our south as of 5z. Nocturnal LLJ is strongest through the central Plains (around 40kts) where aforementioned convection is strongest; the edge of this is likely helping backbuilding convection over the Mid MS Valley where storms have been training over IA all night along an east-west(ish) baroclinic zone. Cooler air slowly trying to sag southward from Ontario (+8C 850mb temps here), with thermal gradient tightening a bit near Lake Superior...and a couple subtle, weak, high-bridged boundaries stretch from the Northern Plains up toward James Bay.

Ridge axis starts to rebuild to our west today as lobe of PV largely becomes part of broader troughing over eastern Canada/Quebec, leaving loose BCZ draped E-W across some portion of the region today. Would generally anticipate high pressure and largely quiet conditions...but any perturbations tracking through the flow could pop some storms today. Think there may also be a subtle concern for upstream activity late this afternoon to slip in along the thickness gradient tonight, which could keep the heavy rain/storm threat going into the night. Still quite a bit of uncertainty in how things play out going into Saturday morning, with signals for broad pressure and height falls across the Upper Midwest, such that some threat for rain/storms should linger through the Independence Day weekend, though it does appear a touch cooler and less humid overall compared to earlier this week. Northern stream pattern looks progressive through the weekend...with some troughing making its way across Canada going into the start of next week; think this will allow shortwave ridge to build over the Upper Midwest and grant us a chance at some warmer conditions again as southern stream ridge starts to settle back into the central/southern Plains. Signals for generally zonal flow and confluence aloft across the International Border through the middle of next week as energy sneaks into the western US suggest we will remain active but seasonable/warm into the latter half of next week.

FORECAST DETAILS...

Heat/humidity today...Worst case scenario first: we mix to 850mb and temperatures actually ramp up to 88-92F across the area, with localized downslope hot spots a degree or two warmer across Gladwin/Arenac counties; dewpoints in the 68-72F range would put us at max heat indices of 98-102F. BUT...I am not sure we're going to get there. Firstly, think the abundance of upstream convective/ debris clouds are going to muddle the max heat potential, and keep temps a touch cooler up here. The very wet soils across much of northern Michigan should also limit excessive heating (though the relatively drier soils may be closer to Saginaw Bay, for what it's worth). Any early/midday convection would further aid in keeping things cooler. Guidance suggests the warm nose around 850mb will be tough to mix out (which could limit storm potential today; see below); think we have a better shot at mixing to 925mb or so, which supports highs largely in the 80s. Think tds today will remain similar to yesterday (a little less soupy) which should further limit heat indices. Best shot at reaching/exceeding heat advisory criteria is our Saginaw Bay region as usual...though not confident enough today to pull the trigger on another headline. All this being said...it will still be on the muggy side, so those sensitive to heat/humidity should still take appropriate precautions.

Heavy rain potential through tonight...Given potential for the E-W BCZ in the vicinity, along with some potential for SW low-level flow...have concerns for some training convection, if it develops, though a better shot at this may be to our southwest over the Mid MS Valley, where the LLJ and instability should be better. Flow here could end up a fair bit more nebulous, though...and given generally weak westerly steering flow (generally weak flow overall, for that matter)...think heavy rain will remain a concern, as any storms that do develop should be slow to move on out with pwats likely still hanging around 1-1.5in...lending concerns for localized swaths of 1- 2+in rainfall. (Which would not be good if this occurs over an area that's already seen anywhere from 3-6 inches of rain in the last few days.)

Storm chances today/tonight...we remain warm and humid tonight (temps largely in the 68-72 range across the area as of 6z, though warmer temps yet hold on over SE; dewpoints generally 64-69), which sets the table for potential for some quick instability generation right off the bat this morning...and think this is a possibility, noting some subtle 500mb cold advection across WI and western Lake Superior, which could further aid in destabilizing things, especially across the Yoop near that weak surface boundary. Think there will be some showers/storms this morning, though uncertain attm how good the coverage will be. Deep-layer shear does appear a smidgen better this morning with stronger mid-level winds drifting through, so couldn't entirely rule out storms getting a bit more organized if something gets kicked off; soundings also support some mid-level drying trying to slip in this morning which, atop a low- level moist layer, could enhance convective instability if we can get some forcing. Think the forcing is the sticky wicket with the forecast, as there are no super strong synoptic signals, and it appears we may hang onto a bit of a warm nose aloft that could be a struggle for any perturbations (whether PV or gravity wave from ongoing upstream convection) to overcome. Primary source of lift may end up being that boundary draping southward across the Yoop/Tip of the Mitt today, perhaps with the aid of some lake breeze generation. All this being said...if we end up with more mid/high clouds this morning, think our chances for activity will be lessened until late afternoon/evening when another round of upstream convection could develop and track toward us. Primary concerns severe-wise would be damaging winds, especially if any activity gets organized upstream, and perhaps hail if we cool enough aloft...though we still look quite warm through the column (warm cloud layer still around or deeper than 3km).

Storms possible on Independence Day...while it appears we should be trending cooler and less humid overall to start the holiday weekend, that disturbance in the vicinity should be enough to trigger some showers/storms. Attm, looks like the best shot at this would be in the afternoon with better diurnal heating, though certainly possible we may be dealing with some lingering activity from the overnight hours as we go into the morning...and will need to see how this plays out. Think diurnal heating and lake breezes will come into play, with somewhat cooler temps aloft and a better shot at generating some surface-based instability. Flow overall appears quite weak on Saturday, which could lend potential for storms to pulse up on other storms' outflow boundaries and lead to a messy- looking radar...as well as potential for slow-moving and/or multiple pulses of storms in similar areas, which suggests the locally heavy rain threat will remain, as the atmosphere will still be quite rich with moisture. Not sure it will be a washout...but will definitely be a day to keep an eye on the skies as you celebrate America's 250th birthday. The song may largely remain the same for Sunday, too.

AVIATION /12Z TAFS THROUGH 12Z SATURDAY/

Issued at 615 AM EDT Fri Jul 3 2026

VFR to prevail through much of the period. Showers to continue this morning into the afternoon, but should continue falling from a cloud deck over 7,000ft off the ground. As such, any reductions in flight categories should be rather brief. May need to watch for a stray thunderstorm at APN or CIU later this afternoon, but confidence in that remains low... otherwise, shower activity may wane in the evening before picking back up, particularly at MBL and perhaps TVC overnight. Light winds today go calm overnight. Will have to watch for BR / FG late in the forecast period, with the best overall shot favoring MBL for the time being.

APX WATCHES/WARNINGS/ADVISORIES

MI...None. MARINE...None.