Sunrise 6:08 AM   Sunset 8:54 PM Moonrise 3:12 PM   Moonset 2:53 AM

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LCZ423 320 Am Edt Fri Apr 19 2024
.strong Thunderstorms approaching the waters - .
the areas affected include - . Detroit river - . Michigan waters of lake erie from detroit river to north cape mi - .
at 320 am edt, doppler radar indicated strong Thunderstorms, capable of producing winds up to 30 knots. These Thunderstorms were located along a line extending from 6 nm northwest of bolles harbor of refuge to 9 nm south of north cape, moving northeast at 40 knots.
strong Thunderstorms will be near - . Monroe harbor, bolles harbor of refuge, north cape, luna pier, and detroit beach around 325 am edt. Stony point and woodland beach around 330 am edt. Estral beach and gibraltar around 340 am edt. Lake erie metropark harbor and detroit river light around 345 am edt. Elizabeth park marina around 350 am edt.
other locations impacted by strong Thunderstorms include woodland beach, stony point, gibraltar, estral beach, and detroit beach.
precautionary/preparedness actions - .
mariners can expect gusty winds up to 30 knots, locally higher waves, and lightning strikes. Boaters should seek safe harbor immediately until these storms pass.
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lat - .lon 4173 8345 4173 8350 4180 8350 4195 8337 4197 8328 4217 8321 4219 8319 4218 8313 4212 8312 4203 8315 4196 8311 4180 8333 4172 8341 4172 8347

LCZ400
No data

FXUS63 KDTX 180537 AFDDTX

Area Forecast Discussion National Weather Service Detroit/Pontiac MI 137 AM EDT Sat May 18 2024

KEY MESSAGES

- Areas of fog developing overnight.

- An Air Quality Alert is in effect for portions of Southeast Michigan Saturday, including Metro Detroit.

- Very warm and muggy conditions will be in-place this weekend with additional opportunities for thunderstorms Sunday and again early next week.

AVIATION

Low stratus and fog will fill in over the area overnight with IFR to occasional LIFR conditions. This will be especially true from KPTK south. Fog will dissipate between 12z-14z Saturday morning with VFR conditions thereafter. Winds will remain under 10 knots and more or less from the southeast.

For DTW/D21 Convection...Thunderstorms are not expected during this forecast period.

DTW THRESHOLD PROBABILITIES...

* High for ceilings aob 5kft overnight, low Saturday morning.

* Medium for ceilings and visibilities to drop below 200ft or 1/2SM overnight.

PREV DISCUSSION
Issued at 328 PM EDT Fri May 17 2024

DISCUSSION...

Partial clearing after morning showers has allowed for areas of sufficient insolation which converts building instability to surface- based CAPE. Diurnal convective development has initiated in isolated to widely-scattered fashion with surface dewpoints near 60F. Severe threat remains quite low given 0-6 km bulk shear values AOB 25 knots, therefore expect mostly short-lived pulse-like thunderstorms.
Latest CAMs suggest a slight increase in coverage with the arrival of a low-amplitude shortwave aloft. Varying storm motions possible as a weak low pressure system/triple-point stalls over Midland.
Multiple boundaries within the vicinity offer several additional point-sources for lift, augmented by MUCAPEs of 750-1250 J/kg.
Steepest lapse rates should be located within the 500-400 mb level, exceeding 8 C/km for part of the afternoon while the lower layer settles closer to moist adiabatic. Some pea-sized hail and few gusts to 40 mph are the main threats today. Storms wane after 9 PM as the mid-levels warm slightly and surface-based activity is cut-off by the development of a nocturnal inversion. A couple lingering showers are possible early tonight before the surface pattern gets washed out.

Weak ridging ensues Saturday with anticyclonic flow noted above 700 mb. Dewpoints remain elevated (near 60F), but forecast soundings reveal thermodynamic profiles that are a bit too warm to facilitate convective updrafts. High temperatures warm to near 80F for most areas while light southeast winds draw slightly cooler air to the coastal communities off the lakes. Clouds thin heading into the afternoon hours as a subsidence inversion develops between 800 and 700 mb.

Flow veers southwesterly Sunday as a deep closed low drifts into northwestern Ontario. An attendant cold front extending well south of the surface reflection washes out over Lake Michigan midday as the warm advection arm traces back to northern Texas. Locally, temperatures top out well above normal as highs peak in the low to mid 80s marked by 850 mb temps of 14-15C. Note that some model variance remains between the ensemble and deterministic solutions as it pertains to thermodynamics. Additional differences noted in QPF magnitude/extent, but most solutions do agree that some convective storms should arise during the PM hours. Dewpoints in the lower 60s and steep low-level lapse-rates should activate surface parcels as shortwave perturbations embedded within the periphery of the leading height fall gradient arrive. Agreed with NBM PoP increase to Slight Chance across most of the forecast area. Low-end potential exists for additional storms Sunday night as a more robust CVA response streams through the drying mid-levels.

An unsettled pattern continues early next week as the synoptic ridge becomes stationary over The Appalachians and the northern stream jet remains active just off to the west. Several shortwaves will eject eastward out of stalled longwave trough Monday and Tuesday with additional ThetaE intrusions. Strong to severe storms would be most probable Tuesday as dewpoints peak in the mid 60s and 0-6 km bulk shear approaches 30 knots. The upper level configuration unlocks Wednesday as an energetic low drops into the Pacific Northwest from the Gulf of Alaska triggering ridge amplification over the Intermountain West. This kicks the jet eastward Wednesday along with a cold front which could initiate some preceding convection locally, depending on timing and southern stream wave interactions. Post- frontal conditions should be noticeably cooler for the back half of next week with a return to near-normal readings.

MARINE...

Scattered showers potentially producing thunderstorms will move over Lake Huron and Lake Erie this afternoon as a weak low pressure center and frontal boundary move across the region. Gentle southerly winds over Lake Huron will back to become more easterly this evening, decreasing down to about 5 knots. These calm winds and moist conditions will lead to some patchy fog overnight. Fog over the lake will hang around for a bit longer than over land, lasting into the early afternoon. Benign and predominantly southerly winds persist through the weekend with a weak cold front moving through on Sunday. Potential for more unsettled conditions Monday night into Tuesday as a stronger system moves into the area. This system will bring moderate southerly winds as well as showers and thunderstorms.

DTX WATCHES/WARNINGS/ADVISORIES
MI...None.
Lake Huron...None.
Lake St Clair...None.
Michigan waters of Lake Erie...None.

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