Alert archive / Wisconsin / Flash Flood Warnings in 2018

Flash Flood Warning 7, NWS Milwaukee, WI

August 26, 2018Milwaukee County, Ozaukee County, Wisconsin

NWS Milwaukee, WI issued this flash flood warning at Aug 26, 2018, 11:04 PM CDT for Milwaukee County, Ozaukee County, Wisconsin. It was in force for 3 hr. 10 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 26, 2018, 11:04 PM CDT (04:04 UTC)
Expired
Aug 27, 2018, 2:00 AM CDT
In force
3 hr
Issued by
NWS Milwaukee, WI
Area
Storm-based polygon
Flood severity
None

Counties Milwaukee County, WI, Ozaukee County, WI

The radar

The Milwaukee radar (KMKX), 56 km from the middle of the area, began a volume at 04:06 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Aug 26, 11:25 PM CDTFLASH FLOOD2 Sw Whitefish Bay, WISTALLED VEHICLES IN FLOODED INTERSECTION OF TEUTONIA AVENUE AND CAPITOL DRIVE. MORE FLOODING AT INTERSECTION OF 20TH STREET AND CAPITOL DRIVE.
Aug 26, 11:45 PM CDTFLASH FLOOD1 S Mequon, WIINTERSECTION OF CEDARBURG ROAD AND DIVISION STREET CLOSED DUE TO FLOODING. A FEW OTHER INTERSECTIONS IN MEQUON ALSO ARE FLOODED.
Aug 27, 12:00 AM CDTHEAVY RAIN 2.261 Sse Milwaukee, WIMMSD RAIN GAUGE.
Aug 27, 12:00 AM CDTHEAVY RAIN 2.414 Nw Milwaukee, WIMMSD RAIN GAUGE.
Aug 27, 12:00 AM CDTHEAVY RAIN 2.953 W Brown Deer, WIMMSD RAIN GAUGE.
Aug 27, 12:00 AM CDTHEAVY RAIN 3.142 Ese Cedarburg, WIMMSD RAIN GAUGE.
Aug 27, 12:00 AM CDTHEAVY RAIN 3.192 Sw Glendale, WIMMSD RAIN GAUGE.
Aug 27, 12:00 AM CDTHEAVY RAIN 3.343 Ene Butler, WIMMSD RAIN GAUGE.
Aug 27, 12:00 AM CDTHEAVY RAIN 3.4Mequon, WI
Aug 27, 12:00 AM CDTHEAVY RAIN 3.561 N Glendale, WIMMSD RAIN GAUGE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 4.1 hours before the alert went out and 148 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Green Bay/Straub, WI at 00:00Z on 2018-08-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 103 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 00:00Z on 2018-08-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 144 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
103 J/kg
Mixed-layer CIN
-176 J/kg
Mixed-layer LCL
894 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
144 m²/s²
0-3 km storm-relative helicity
110 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

656 
WGUS53 KMKX 270404
FFWMKX
WIC079-089-270700-
/O.NEW.KMKX.FF.W.0007.180827T0404Z-180827T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Milwaukee/Sullivan WI
1104 PM CDT SUN AUG 26 2018

The National Weather Service in Milwaukee/Sullivan has issued a

* Flash Flood Warning for...
  Southern Ozaukee County in southeastern Wisconsin... 
  Northern Milwaukee County in southeastern Wisconsin...

* Until 200 AM CDT.

* At 1102 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to 2.50 inches of rain have 
  already fallen in the past few hours in some areas. Flash flooding 
  is expected to begin shortly.

* Some locations that will experience flooding include...
  Milwaukee, West Allis, Wauwatosa, Mequon, Whitefish Bay, Brown
  Deer, Grafton, Cedarburg, Port Washington, Fox Point, Bayside, West
  Milwaukee, Thiensville, Butler, River Hills, Milwaukee Hoan Bridge,
  Shorewood, Marquette University, UW-
  Milwaukee and Milwaukee Bradford Beach.

Additional rainfall amounts of one to two inches are possible in the 
warned area in the next hour or two.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.

&&

LAT...LON 4303 8788 4301 8788 4301 8807 4336 8806
      4338 8786 4326 8789 4324 8789 4318 8787
      4312 8788 4307 8785

$$

WOOD
2 follow-up statements
730 
WGUS73 KMKX 270459
FFSMKX

Flash Flood Statement
National Weather Service Milwaukee/Sullivan WI
1159 PM CDT SUN AUG 26 2018

WIC079-089-270700-
/O.CON.KMKX.FF.W.0007.000000T0000Z-180827T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ozaukee WI-Milwaukee WI-
1159 PM CDT SUN AUG 26 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 AM CDT FOR
SOUTHWESTERN OZAUKEE AND NORTHERN MILWAUKEE COUNTIES...

At 1152 PM CDT, Doppler radar indicated thunderstorms producing 
heavy rain across the warned area. Between 2.00 to 3.50 inches of 
rain have already fallen. Flash flooding is expected to begin 
shortly, or is already occurring.

Some locations that will experience flooding include...
Milwaukee, West Allis, Wauwatosa, Mequon, Whitefish Bay, Brown Deer,
Grafton, Cedarburg, Port Washington, Fox Point, Bayside, West
Milwaukee, Thiensville, Butler, River Hills, Milwaukee Hoan Bridge,
Shorewood, Marquette University, UW-
Milwaukee and Milwaukee Bradford Beach.

Additional rainfall amounts of up to 0.50 inches are possible in 
southern Ozaukee County over the next hour. Most of the thunderstorm 
activity has moved out of Milwaukee County. 

However, runoff from the heavy rainfall will cause flash flooding 
for the next few hours across low lying areas, especially small 
creeks and streams, and streets and intersections at the bottom of 
hills and in low spots. Do not drive into flooded roads!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.

&&

LAT...LON 4303 8788 4301 8788 4301 8807 4336 8806
      4338 8786 4326 8789 4324 8789 4318 8787
      4312 8788 4307 8785

$$

WOOD
373 
WGUS73 KMKX 270550
FFSMKX

Flash Flood Statement
National Weather Service Milwaukee/Sullivan WI
1250 AM CDT MON AUG 27 2018

WIC079-089-270700-
/O.CON.KMKX.FF.W.0007.000000T0000Z-180827T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ozaukee WI-Milwaukee WI-
1250 AM CDT MON AUG 27 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 AM CDT FOR
SOUTHWESTERN OZAUKEE AND NORTHERN MILWAUKEE COUNTIES...

At 1245 AM CDT, Doppler radar indicated additional thunderstorms 
developing over or moving into the warned area. 2.00 to 3.50 inches 
of rain have already fallen in the warned area. Flash flooding is 
expected to begin shortly, or is already occurring.

Some locations that will experience flooding include...
Milwaukee, West Allis, Wauwatosa, Mequon, Whitefish Bay, Brown Deer,
Grafton, Cedarburg, Port Washington, Fox Point, Bayside, West
Milwaukee, Thiensville, Butler, River Hills, Milwaukee Hoan Bridge,
Shorewood, Marquette University, UW-
Milwaukee and Milwaukee Bradford Beach.

Additional rainfall amounts of up to 0.50 inches are in the warned 
areas, with the scattered thunderstorms developing over or moving 
into the warned area.

Runoff from the previous heavy rainfall will cause flash flooding 
for the next hour or two across low lying areas, especially small 
creeks and streams, and streets and intersections at the bottom of 
hills and in low spots. Do not drive into flooded roads!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.

&&

LAT...LON 4303 8788 4301 8788 4301 8807 4336 8806
      4338 8786 4326 8789 4324 8789 4318 8787
      4312 8788 4307 8785

$$

WOOD

The office that day

Everything else NWS Milwaukee, WI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 26, 8:04 PM CDTTornado WarningMKXColumbia20 min
Aug 26, 8:08 PM CDTSpecial Weather StatementMKXGreen37 min
Aug 26, 8:42 PM CDTSevere Thunderstorm WarningMKXDane, Jefferson, Rock48 min
Aug 26, 8:50 PM CDTSpecial Weather StatementMKXDodge55 min
Aug 26, 9:02 PM CDTSevere Thunderstorm WarningMKXDodge31 min
Aug 26, 9:10 PM CDTSevere Thunderstorm WarningMKXJefferson35 min
Aug 26, 9:29 PM CDTSevere Thunderstorm WarningMKXJefferson, Waukesha31 min
Aug 26, 9:38 PM CDTSevere Thunderstorm WarningMKXDodge, Washington37 min
Aug 26, 9:53 PM CDTSevere Thunderstorm WarningMKXWalworth36 min
Aug 26, 10:18 PM CDTSevere Thunderstorm WarningMKXMilwaukee, Ozaukee, Waukesha16 min
Aug 26, 10:22 PM CDTSpecial Marine WarningMKX38 min
Aug 26, 11:06 PM CDTSevere Thunderstorm WarningMKXMilwaukee, Waukesha39 min
Aug 26, 11:10 PM CDTSpecial Marine WarningMKX65 min
Aug 26, 11:42 PM CDTSevere Thunderstorm WarningMKXRock, Walworth19 min
Aug 26, 11:48 PM CDTSpecial Marine WarningMKX57 min
Aug 27, 12:56 AM CDTSpecial Marine WarningMKX64 min
Aug 27, 1:59 AM CDTFlash Flood WarningMKXOzaukee3 hr
Aug 27, 2:14 AM CDTAreal Flood AdvisoryMKXDodge, Washington3 hr
Aug 27, 2:20 AM CDTAreal Flood AdvisoryMKXOzaukee, Sheboygan3 hr
Aug 27, 3:27 AM CDTSmall Craft AdvisoryMKX40 hr
Aug 27, 5:03 AM CDTAreal Flood WarningMKXOzaukee, Washington15 hr
Aug 27, 6:27 AM CDTMarine Dense Fog AdvisoryMKX5 hr
Aug 27, 9:12 AM CDTRiver Flood WarningMKXOzaukee72 hr
Aug 27, 9:12 AM CDTRiver Flood WarningMKXOzaukee4 days
Aug 27, 11:45 AM CDTFlash Flood WatchMKXColumbia, Dane, Dodge, Fond du Lac, Green, Green Lake and 10 more35 hr
Aug 27, 3:13 PM CDTMarine Dense Fog AdvisoryMKX10 hr

Nearby

Flash Flood Warnings in Wisconsin, 2018Every flash flood warning in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.