Alert archive / Wisconsin / Flash Flood Warnings in 2018
Flash Flood Warning 8, NWS Milwaukee, WI
NWS Milwaukee, WI issued this flash flood warning at Aug 27, 2018, 1:59 AM CDT for Ozaukee County, Wisconsin. It was in force for 3 hr. 5 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 27, 2018, 1:59 AM CDT (06:59 UTC)
- Expired
- Aug 27, 2018, 5:00 AM CDT
- In force
- 3 hr
- Issued by
- NWS Milwaukee, WI
- Area
- Storm-based polygon
- Flood severity
- None
County Ozaukee County, WI
The radar
The Milwaukee radar (KMKX), 63 km from the middle of the area, began a volume at 07:03 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
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 27, 2:25 AM CDT | HEAVY RAIN 3.76 | 3 W Cedarburg, WI | |
| Aug 27, 2:30 AM CDT | FLASH FLOOD | Grafton, WI | STREET FLOODING IN GRAFTON, SAUKVILLE AND PORT WASHINGTON. |
| Aug 27, 3:00 AM CDT | HEAVY RAIN 4 | 1 Se Thiensville, WI | |
| Aug 27, 3:00 AM CDT | HEAVY RAIN 8.5 | Port Washington, WI | |
| Aug 27, 4:00 AM CDT | HEAVY RAIN 9.18 | 1 S Port Washington, WI |
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, 7.0 hours before the alert went out and 130 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.
- 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
The text
As transmitted.
200
WGUS53 KMKX 270659
FFWMKX
WIC089-271000-
/O.NEW.KMKX.FF.W.0008.180827T0659Z-180827T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Milwaukee/Sullivan WI
159 AM CDT MON AUG 27 2018
The National Weather Service in Milwaukee/Sullivan has issued a
* Flash Flood Warning for...
Southern Ozaukee County in southeastern Wisconsin...
* Until 500 AM CDT.
* At 158 AM CDT, Doppler radar indicated heavy rain across the warned
area. Up to three inches of rain have already fallen. Flash
flooding is already occurring in Mequon.
* Some locations that will experience flooding include...
Mequon, Brown Deer, Grafton, Cedarburg, Port Washington, Saukville,
Bayside and Thiensville.
Additional rainfall amounts of one inch are possible in the warned
area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 4336 8786 4326 8789 4324 8789 4319 8788
4319 8806 4337 8806 4337 8804 4340 8804
4342 8782
$$
GEHRING1 follow-up statement
835
WGUS73 KMKX 270811
FFSMKX
Flash Flood Statement
National Weather Service Milwaukee/Sullivan WI
311 AM CDT MON AUG 27 2018
WIC089-271000-
/O.CON.KMKX.FF.W.0008.000000T0000Z-180827T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ozaukee WI-
311 AM CDT MON AUG 27 2018
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 500 AM CDT FOR
SOUTHERN OZAUKEE COUNTY...
At 308 AM CDT, Doppler radar indicated heavy rain coming to an end
across the warned area. Three to six inches of rain have already
fallen. Flash flooding of streets is already occurring in Grafton,
Saukville, Port Washington and surrounding areas.
Some locations that will experience flooding include...
Mequon, Brown Deer, Grafton, Cedarburg, Port Washington, Saukville,
Bayside and Thiensville.
The heavy rainfall is coming to an end, lighter rainfall may return
later this morning.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4336 8786 4326 8789 4324 8789 4319 8788
4319 8806 4337 8806 4337 8804 4340 8804
4342 8782
$$
GEHRINGThe office that day
Everything else NWS Milwaukee, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 8:04 PM CDT | Tornado Warning | MKX | Columbia | 20 min |
| Aug 26, 8:08 PM CDT | Special Weather Statement | MKX | Green | 37 min |
| Aug 26, 8:42 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Jefferson, Rock | 48 min |
| Aug 26, 8:50 PM CDT | Special Weather Statement | MKX | Dodge | 55 min |
| Aug 26, 9:02 PM CDT | Severe Thunderstorm Warning | MKX | Dodge | 31 min |
| Aug 26, 9:10 PM CDT | Severe Thunderstorm Warning | MKX | Jefferson | 35 min |
| Aug 26, 9:29 PM CDT | Severe Thunderstorm Warning | MKX | Jefferson, Waukesha | 31 min |
| Aug 26, 9:38 PM CDT | Severe Thunderstorm Warning | MKX | Dodge, Washington | 37 min |
| Aug 26, 9:53 PM CDT | Severe Thunderstorm Warning | MKX | Walworth | 36 min |
| Aug 26, 10:18 PM CDT | Severe Thunderstorm Warning | MKX | Milwaukee, Ozaukee, Waukesha | 16 min |
| Aug 26, 10:22 PM CDT | Special Marine Warning | MKX | 38 min | |
| Aug 26, 11:04 PM CDT | Flash Flood Warning | MKX | Milwaukee, Ozaukee | 3 hr |
| Aug 26, 11:06 PM CDT | Severe Thunderstorm Warning | MKX | Milwaukee, Waukesha | 39 min |
| Aug 26, 11:10 PM CDT | Special Marine Warning | MKX | 65 min | |
| Aug 26, 11:42 PM CDT | Severe Thunderstorm Warning | MKX | Rock, Walworth | 19 min |
| Aug 26, 11:48 PM CDT | Special Marine Warning | MKX | 57 min | |
| Aug 27, 12:56 AM CDT | Special Marine Warning | MKX | 64 min | |
| Aug 27, 2:14 AM CDT | Areal Flood Advisory | MKX | Dodge, Washington | 3 hr |
| Aug 27, 2:20 AM CDT | Areal Flood Advisory | MKX | Ozaukee, Sheboygan | 3 hr |
| Aug 27, 3:27 AM CDT | Small Craft Advisory | MKX | 40 hr | |
| Aug 27, 5:03 AM CDT | Areal Flood Warning | MKX | Ozaukee, Washington | 15 hr |
| Aug 27, 6:27 AM CDT | Marine Dense Fog Advisory | MKX | 5 hr | |
| Aug 27, 9:12 AM CDT | River Flood Warning | MKX | Ozaukee | 72 hr |
| Aug 27, 9:12 AM CDT | River Flood Warning | MKX | Ozaukee | 4 days |
| Aug 27, 11:45 AM CDT | Flash Flood Watch | MKX | Columbia, Dane, Dodge, Fond du Lac, Green, Green Lake and 10 more | 35 hr |
| Aug 27, 3:13 PM CDT | Marine Dense Fog Advisory | MKX | 10 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.