A line of strong thunderstorms along a cold front moved across central Wisconsin during the early morning hours. One report of severe wind gusts was reported.
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The episode as NWS MKX wrote it up.
A line of strong thunderstorms along a cold front moved across central Wisconsin during the early morning hours. One report of severe wind gusts was reported.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Milwaukee, WI wrote its last area forecast discussion before the first event at Jul 19, 1:33 AM CST, 1 hour 47 minutes earlier.
Area Forecast Discussion National Weather Service Milwaukee/Sullivan WI 233 AM CDT Sun Jul 19 2020 .SHORT TERM... Today through Tonight...Forecast Confidence: Medium. An upper level trough and cold front are steadily moving eastward across the northern plains early this morning. There is a severe MCS currently over central Wisconsin this morning. With the continued warm air advection and steady eastward movement of the cold front, showers/storms are expected to develop and move through southern Wisconsin yet this morning. The uncertainty with this system remains with its timing. The movement of the cold front and MCS has slowed down as it has moved eastward. These showers and storms are expected to move into areas northwest of Madison between 08Z and 10Z this morning. Despite the slower arrival time of these storms they are expected to clear southern Wisconsin around daybreak. The main hazards with these storms will be damaging winds. After the cold front has moved through this morning and the storms have cleared southern Wisconsin, quite weather is expected to return. Skies will beginning clearing late Sunday morning and temperatures will climb back into the low to mid 80s. .LONG TERM... Monday through Tuesday…Forecast Confidence…Medium Monday, we will start to see weak high pressure build in with a rather short period of zonal UL flow through the day Monday. It will be dry during the day. There may be a weak shortwave to the south that could bring some showers Monday night, but that appears unlikely at this point. Later Tuesday, an upper level shortwave will likely push across northern Wisconsin likely being associated with a weak surface low that could bring some showers and mostly weak storms across the area late Tuesday in association with the front. However, the forcing appears to be better further north closer to the surface low and UL shortwave which could end up meaning southern Wisconsin remains mostly dry. There is still some uncertainty given plenty of low to mid level moisture over the region so if forcing is strong enough along the front, we could see some showers/storms. Wednesday through Saturday…Forecast Confidence…Medium Behind the shortwave and surface low passing through northern Wisconsin overnight Tuesday, a large scale ridge will drape itself over the entire central US with fairly strong high pressure building into the Great Lakes region. Although this ridge will remain draped over the region for the period, a few embedded shortwaves will be possible bringing small chances for showers and storms on Thursday. The best chance appears to be Friday with models suggesting a fairly strong UL shortwave pushing across northern Wisconsin. Although the primary potential for showers/storms look to be further north there is still uncertainty in the track. Otherwise expect fairly nice temperatures to start this period with some potential for a warm up as we head into the weekend. && .AVIATION(06Z TAFS)... Thunderstorms are expected to move through southern Wisconsin overnight tonight. A few of these storms could have the potential to be severe. The winds will be gusty tonight as the low level jet moves over the area. There is still some uncertainty with the timing that these storms will move through southern Wisconsin this evening.The storms are expected to arrive between midnight and 3am. The storms are expected to clear the east by around daybreak Sunday. Once the storms have cleared, quiet weather is expected to return. && .MARINE... A low pressure system is moving across Ontario early this morning, with the associated cold front moving across Lake Michigan Sunday morning. As the cold front passes winds will shift from southwesterly to westerly and strong to severe storms will sweep across the lake. These storms are expected to move eastward out of the area by late Sunday morning. Quite weather and light winds are then expected to return through Monday. && .MKX WATCHES/WARNINGS/ADVISORIES... WI...None. LM...None. && Today/Tonight and Aviation/Marine...Patterson Monday through Saturday...ARK
Hazardous Weather Outlook National Weather Service Milwaukee/Sullivan WI 238 AM CDT Sun Jul 19 2020 WIZ046-047-051-052-056>060-062>072-200745- Marquette-Green Lake-Fond du Lac-Sheboygan-Sauk-Columbia-Dodge- Washington-Ozaukee-Iowa-Dane-Jefferson-Waukesha-Milwaukee- Lafayette-Green-Rock-Walworth-Racine-Kenosha- 238 AM CDT Sun Jul 19 2020 This Hazardous Weather Outlook is for portions of east central Wisconsin, south central Wisconsin and southeast Wisconsin. .DAY ONE...Today and Tonight A broken line of strong to severe thunderstorms is expected to move through the area this morning. Gusty winds and frequent lighting will be possible. .DAYS TWO THROUGH SEVEN...Monday through Saturday Thunderstorm chances will return to the area later Monday night into Tuesday, with periodic chances for storms continuing through the remainder of the week. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed overnight. LMZ643>646-200745- Sheboygan to Port Washington WI- Port Washington to North Point Light WI- North Point Light to Wind Point WI- Wind Point WI to Winthrop Harbor IL- 238 AM CDT Sun Jul 19 2020 This Hazardous Weather Outlook is for the nearshore waters from Sheboygan Wisconsin to Winthrop Harbor Illinois. .DAY ONE...Today and Tonight A broken line of strong to severe thunderstorms is expected to move through the area this morning. Gusty winds and frequent lightning will be possible. .DAYS TWO THROUGH SEVEN...Monday through Saturday Thunderstorm chances will return to the area by Tuesday, with periodic chances for storms through the end of the week. LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868- 870-872-874-876-878-200745- Lake Michigan Michigan City IN to St. Joseph MI 5 NM offshore to mid-line of lake.- Lake Michigan from Seul Choix Point to Rock Island Passage 5NM offshore to Mid Lake- Lake Michigan South of a line from Seul Choix Point to the Mackinac Bridge and North of a line from Charlevoix MI to South Fox Island 5NM offshore- Lake Michigan from Charlevoix to Point Betsie MI 5NM Offshore to mid lake- Lake Michigan from Point Betsie to Manistee MI 5NM offshore to Mid Lake- Lake Michigan from Rock Island Passage to Sturgeon Bay WI 5NM offshore to mid lake- Lake Michigan from Sturgeon Bay to Two Rivers WI 5NM offshore to Mid Lake- Lake Michigan from Two Rivers to Sheboygan WI 5NM offshore to Mid Lake- Lake Michigan from Sheboygan to Port Washington WI 5NM offshore to Mid Lake- Lake Michigan from Port Washington to North Point Light WI 5NM offshore to Mid Lake- Lake Michigan from North Point Light to Wind Point WI 5NM offshore to Mid Lake- Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM offshore to Mid Lake- Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake- Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake- Lake Michigan from Pentwater to Manistee MI 5NM offshore to Mid Lake- Lake Michigan from Whitehall to Pentwater MI 5NM offshore to Mid Lake- Lake Michigan from Grand Haven to Whitehall MI 5NM offshore to Mid Lake- Lake Michigan from Holland to Grand Haven MI 5NM offshore to Mid Lake- Lake Michigan from South Haven to Holland MI 5NM offshore to Mid lake- Lake Michigan from St Joseph to South Haven MI 5NM offshore to Mid Lake- 238 AM CDT Sun Jul 19 2020 This Hazardous Weather Outlook is for the open waters of Lake Michigan. .DAY ONE...Today and Tonight A broken line of strong to severe thunderstorms is expected to move through the region this morning. Gusty winds and frequent lightning will be possible. .DAYS TWO THROUGH SEVEN...Monday through Saturday Periodic chances for thunderstorms are expected from Tuesday through the end of the week. www.weather.gov/mkx
Special Weather Statement
National Weather Service Milwaukee/Sullivan WI
328 AM CDT Sun Jul 19 2020
WIZ046-047-190915-
Green Lake-Marquette-
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT GREEN LAKE AND
MARQUETTE COUNTIES...
At 328 AM CDT, radar indicated strong thunderstorms were located
along a line extending from 6 miles west of Lake Poygan to 7 miles
south of Adams. Movement was east at 45 mph.
Wind gusts up to 50 mph and penny size hail are possible with these
storms.
Locations impacted include...
Berlin, Montello, Markesan, Westfield, Princeton, Green Lake,
Lawrence, Packwaukee, Manchester, Mecan, Oxford, Endeavor, Neshkoro,
Kingston, Marquette, Glen Oak, Harrisville, Springfield Corners,
Dalton and Briggsville.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
LAT...LON 4364 8889 4365 8960 4394 8960 4398 8948
4398 8889
TIME...MOT...LOC 0828Z 286DEG 41KT 4413 8898 4385 8978
BOXELLThe Milwaukee radar (KMKX), 112 km away, was scanning. The volume nearest the first event began at 09:21 UTC.
1 thunderstorm wind. Local standard time, as filed.
The Endeavor Fire Department estimated a wind gust of 60 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2020Every state in 2020This day in weather historyWarnings in Wisconsin, July 2020
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 909472.