Thunderstorms developed in moist and unstable air ahead of a passing cold front. Some of the storms became severe, damaging trees and power lines and dropping large hail.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GRB wrote it up.
Thunderstorms developed in moist and unstable air ahead of a passing cold front. Some of the storms became severe, damaging trees and power lines and dropping large hail. Torrential rainfall also accompanied many of the storms.
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 Green Bay, WI wrote its last area forecast discussion before the first event at Aug 5, 5:47 AM CST, 6 hours 23 minutes earlier.
Area Forecast Discussion National Weather Service Green Bay WI 647 AM CDT Mon Aug 5 2019 Updated aviation portion for 12Z TAF issuance .SHORT TERM...Today...Tonight...and Tuesday Issued at 417 AM CDT Mon Aug 5 2019 The possibility of strong to severe thunderstorms is the main challenge today as an upper trough and surface cold front approache from the west. Dewpoints in the middle to upper 60s and precipitable water values of 100 to 150 percent of normal values should produce surface based CAPE values of 2000 J/kg or more this afternoon. 500mb winds of 40 to 50 knots forecast to move across the area today with over 100 knots at 250 mb reported by aircraft upstream at 07z. There are big differences in the forecast of individual jet streaks (some likely convectively induced) this afternoon and evening, which makes for a large range in model storm timing and location. Confidence is moderate in strong to severe storms moving across the area this afternoon and evening but is low as far as timing and placement. CIPS analogs have a 50 percent probability of severe storms over the forecst area. As wet bulb zero heights are rather high, and directional shear is modest, the main severe threat appears to be damaging winds and locally heavy rains. Highs today should reach the 80s with middle to upper 80s possible in the east if storms are slow to arrive. The activity should exit eastern Wisconsin by late evening, with some clearing after midnight. Wet ground and light winds will lead to some ground fog in some locations. Lows should be a few degrees above normal. There is not really any cold air behind the front, so highs Tuesday should be several degrees above normal. WHile there are no real forcing mechanisms for precipitation, there may be enough surface based instability to produce isolated storms in the afternoon, though left them out for now. .LONG TERM...Tuesday Night Through Sunday Issued at 417 AM CDT Mon Aug 5 2019 The focus of the long term will be the next round of potentially severe weather arriving Wednesday afternoon with a strong cold front. Tuesday night into Wednesday is expected to be dry for the region. The main focus of Wednesday will be a strong cold front that is currently expected to arrive around the peak heating hours in the afternoon and evening. An upper level jet will provide some upper level support to the frontal passage, with CAPE near the surface rising to 1500-2000 J/kg ahead of the front. Bulk shear for this time will also rise to around 30-40 kts. Therefore, expect the potential for severe weather if the timing holds true. SPC has us in a marginal risk for Day 3, although could see this increase if the timing of the front remains consistent in the next couple days. High temperatures will get into the upper 70s and middle 80s, although this will depend on the timing of the front. After the front passes, high pressure will build back into the area as colder and drier air moves into the area. Expect high temperatures in the 70s through the end of the work week. Next weekend will then see temperatures slowly climb back towards normal. A couple weak shortwaves will ride along the upper level ridge and may bring a few rounds of weaker active weather back into the region into Monday. && .AVIATION...for 12Z TAF Issuance Issued at 647 AM CDT Mon Aug 5 2019 A cold front and upper level disturbance will combine to produce showers and thunderstorms as they move across the region today. IFR conditions and strong surface wind gusts are possible with the thunderstorms, with VFR conditions elsewhere. The activity will end from west to east this evening. Some ground fog or low stratus is possible late tonight through about 12z Tuesday, then VFR conditions will prevail for the remainder of the daytime hours. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM.....RDM LONG TERM......Uhlmann AVIATION.......RDM
Hazardous Weather Outlook National Weather Service Green Bay WI 1145 AM CDT Mon Aug 5 2019 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-061645- Vilas-Oneida-Forest-Florence-Northern Marinette County-Lincoln- Langlade-Menominee-Northern Oconto County-Door-Marathon-Shawano- Wood-Portage-Waupaca-Outagamie-Brown-Kewaunee-Waushara-Winnebago- Calumet-Manitowoc-Southern Marinette County- Southern Oconto County- 1145 AM CDT Mon Aug 5 2019 This Hazardous Weather Outlook is for north-central and northeast Wisconsin. .DAY ONE...This Afternoon and Tonight Severe thunderstorms with damaging winds and heavy rainfall are possible, especially from mid-afternoon through mid-evening. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday There is also a chance of thunderstorms Wednesday afternoon and evening. Some storms may become severe, with damaging winds and large hail. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon and evening. LMZ521-522-541>543-061645- The Bay of Green Bay south of a line from Cedar River MI to Rock Island Passage-Lake Michigan from Washington Island to Sheboygan- 1145 AM CDT Mon Aug 5 2019 This Hazardous Weather Outlook is for portions of northwest Lake Michigan and the waters of Green Bay. .DAY ONE...This Afternoon and Tonight Thunderstorms with strong winds, hail and frequent lightning could be a threat to mariners late this afternoon and evening. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday There is also a chance of thunderstorms Wednesday afternoon and evening. Lightning and strong winds will pose a hazard to mariners. Kieckbusch
Special Weather Statement
National Weather Service Green Bay WI
1238 PM CDT Mon Aug 5 2019
WIZ005-010-011-018-019-051830-
Langlade WI-Vilas WI-Oneida WI-Forest WI-Lincoln WI-
1238 PM CDT Mon Aug 5 2019
...SIGNIFICANT WEATHER ADVISORY FOR WESTERN FOREST...LINCOLN...
VILAS...ONEIDA AND NORTHWESTERN LANGLADE COUNTIES UNTIL 130 PM CDT...
At 1235 PM CDT, Doppler radar was tracking strong thunderstorms
along a line extending from near Winchester to near Willow Reservoir
to 10 miles northwest of Medford. Movement was east at 40 mph.
Pea size hail, heavy rainfall and winds in excess of 40 mph will be
possible with these storms.
Locations impacted include...
Rhinelander, Crandon, Eagle River, Merrill, Lac Du Flambeau,
Tomahawk, Newbold, Harrison, Phelps and Boulder Junction.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Boaters, fishermen and campers should consider seeking sturdy
shelter until these storms pass.
&&
LAT...LON 4614 8910 4602 8878 4603 8877 4561 8880
4512 8943 4513 9004 4560 9004 4568 8995
4624 8991 4624 8962
TIME...MOT...LOC 1735Z 274DEG 36KT 4617 8981 4568 8984 4524 9039
KieckbuschPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
1248 PM CDT MON AUG 5 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1235 PM TSTM WND GST MANITOWISH WATERS 46.13N 89.88W
08/05/2019 M48 MPH VILAS WI AWOS
MEASURED AT D25 AWOS
&&
TIMKThe Green Bay radar (KGRB), 166 km away, was scanning. The volume nearest the first event began at 18:11 UTC.
9 thunderstorm wind, 3 hail. Local standard time, as filed.
Thunderstorm winds downed trees and power lines in the town of Pine Lake.
Thunderstorm winds downed trees, including several ten inch maple trees, and power lines in Three Lakes.
Thunderstorm winds downed a few trees near Argonne.
Thunderstorm winds downed a few trees in Fence.
Thunderstorm winds uprooted a few trees in Birnamwood.
Thunderstorm winds downed a couple of aspen trees in Spread Eagle.
Nickel size hail fell near Wausau.
Thunderstorm winds snapped several tree limbs in Merrill.
Thunderstorm winds uprooted a few trees in Embarrass.
Half dollar size hail fell in Plover.
Golf ball size hail fell in Plover.
Thunderstorm winds downed trees north of Almond on County Highway J.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2019Every state in 2019This day in weather historyWarnings in Wisconsin, August 2019
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: 848635, 848636, 848637, 848638, 848639, 848640, 848536, 848641, 848642, 848632, 848633, 849392.