textproduct: Detroit/Pontiac
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
KEY MESSAGES
- Dry and near seasonal temperatures through the forecast period.
DTW THRESHOLD PROBABILITIES
* None.
PREV DISCUSSION
Issued at 328 AM EDT Thu May 28 2026
DISCUSSION...
A moderately strong high pressure system builds over the Great Lakes today, reinforced from confluent flow aloft. Strong subsidence to support mostly sunny skies but with tempered temperatures within the wake of a cold front. Highs hold in the 70s for most locations, cooler closer the lakeshore from the marine influence under northeast flow. An upper-level closed low will dive south from Quebec into New England while a meandering closed low over California opens up while pivoting into the Four corners. This will strengthening the longwave ridge across the central Plains that will expand into the western Great lakes through the weekend. Surface high pressure will be reinforced with us under very dry conditions characterized by PW values of .25 to .35 inches. This will maintain dry conditions through the weekend along with extended periods of sunshine. The ridge will start to fold over into the Great Lakes as the western CONUS wave released eastward in advance of a secondary wave. This continues the theme of dry conditions and seasonal temperatures through the end of the forecast period.
MARINE...
As high pressure expands from northern Ontario into Lake Superior early this morning, there will be an increase in the north-norhteast winds across the eastern lakes. Wind gusts will reach or exceed 20 knots in the warmer nearshore waters. This will boost wave heights, leading to hazardous conditions to small craft. Winds and waves will decrease late this afternoon into tonight as the surface high gradually sinks southward into the Ohio Valley by Friday. A weak surface cold front will then push across Lake Huron Friday night, in advance of another strong high pressure system. This may result in another period of hazardous small craft conditions in the nearshores.
DTX WATCHES/WARNINGS/ADVISORIES
MI...None. Lake Huron...Small Craft Advisory until 2 PM EDT this afternoon for LHZ421-422- 441.
Small Craft Advisory until 6 PM EDT this evening for LHZ442-443.
Lake St Clair...None. Michigan waters of Lake Erie...None.
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