Alert archive / Wisconsin / Flash Flood Warnings in 2018
Flash Flood Warning 4, NWS Milwaukee, WI
NWS Milwaukee, WI issued this flash flood warning at Aug 17, 2018, 9:20 AM CDT for Dane County, Dodge County, Jefferson County, Wisconsin. It was in force for 3 hr. 3 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 17, 2018, 9:20 AM CDT (14:20 UTC)
- Expired
- Aug 17, 2018, 12:15 PM CDT
- In force
- 3 hr
- Issued by
- NWS Milwaukee, WI
- Area
- Storm-based polygon
- Flood severity
- None
Counties Dane County, WI, Dodge County, WI, Jefferson County, WI
The radar
The Milwaukee radar (KMKX), 33 km from the middle of the area, began a volume at 14:25 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 17, 9:30 AM CDT | HEAVY RAIN 4.92 | 1 Wsw Watertown, WI | 24 HOUR TOTAL. |
| Aug 17, 10:30 AM CDT | HEAVY RAIN 6 | 1 Wsw Watertown, WI | STORM TOTAL. |
| Aug 17, 12:00 PM CDT | HEAVY RAIN 8.6 | 1 S Watertown, WI | STORM TOTAL. |
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 12:00Z, 2.3 hours before the alert went out and 154 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
- 97 J/kg
- Mixed-layer CIN
- -119 J/kg
- Mixed-layer LCL
- 1089 m above ground
- 0-6 km bulk shear
- 3 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 9 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
420
WGUS53 KMKX 171420
FFWMKX
WIC025-027-055-171715-
/O.NEW.KMKX.FF.W.0004.180817T1420Z-180817T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Milwaukee/Sullivan WI
920 AM CDT FRI AUG 17 2018
The National Weather Service in Milwaukee/Sullivan has issued a
* Flash Flood Warning for...
Northeastern Dane County in south central Wisconsin...
Northern Jefferson County in southeastern Wisconsin...
Southwestern Dodge County in southeastern Wisconsin...
* Until 1215 PM CDT.
* At 915 AM CDT, Doppler radar and automated rain gauges indicated
heavy rain falling across the warned area. Five to six inches of
rain have fallen. Flash flooding is already occurring especially
in Watertown. Numerous roads flooded or washed out in Watertown.
High water extending from the roads into the yards with basement
flooding. This will continue over the next few hours.
* Some locations that will experience flooding include...
Watertown, Marshall, Waterloo, Ixonia, Richwood, Pipersville,
Deansville, Hubbleton and Lake Lac La Belle.
Additional rainfall amounts of 1 to 2 inches are possible in the
warned area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.
&&
LAT...LON 4312 8854 4312 8912 4328 8911 4329 8906
4324 8853
$$
GEHRING1 follow-up statement
670
WGUS73 KMKX 171501
FFSMKX
Flash Flood Statement
National Weather Service Milwaukee/Sullivan WI
1001 AM CDT FRI AUG 17 2018
WIC025-027-055-171715-
/O.CON.KMKX.FF.W.0004.000000T0000Z-180817T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Dane WI-Jefferson WI-Dodge WI-
1001 AM CDT FRI AUG 17 2018
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 PM CDT FOR
NORTHEASTERN DANE...NORTHERN JEFFERSON AND SOUTHWESTERN DODGE
COUNTIES...
At 953 AM CDT, Doppler radar and automated rain gauges indicated
that five to seven inches of rain have fallen. Flash flooding is
already occurring especially in Watertown. Rainfall rates are
decreasing with rain ending in some areas. Despite a diminishing
trend, runoff and flash flooding will continue through noon.
Afterward, standing water will remain over many roads and in yards
and fields. Many roads may remain closed through the day.
Some locations that will experience flooding include...
Watertown, Marshall, Waterloo, Ixonia, Richwood, Pipersville,
Deansville, Hubbleton and Lake Lac La Belle.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4312 8854 4312 8912 4328 8911 4329 8906
4324 8853
$$
GEHRINGThe office that day
Everything else NWS Milwaukee, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 8:35 PM CDT | Areal Flood Advisory | MKX | Green, Rock | 3 hr |
| Aug 16, 10:21 PM CDT | Areal Flood Advisory | MKX | Rock | 3 hr |
| Aug 16, 11:22 PM CDT | Flash Flood Warning | MKX | Rock | 4 hr |
| Aug 17, 6:58 AM CDT | Special Marine Warning | MKX | 32 min | |
| Aug 17, 7:22 AM CDT | Areal Flood Advisory | MKX | Dane, Dodge, Jefferson, Waukesha | 3 hr |
| Aug 17, 7:35 AM CDT | Areal Flood Advisory | MKX | Milwaukee | 55 min |
| Aug 17, 8:15 AM CDT | Areal Flood Warning | MKX | Dane, Dodge, Jefferson | 3 hr |
| Aug 17, 11:08 AM CDT | Areal Flood Advisory | MKX | Milwaukee | 112 min |
| Aug 17, 12:22 PM CDT | Areal Flood Warning | MKX | Dodge, Jefferson | 21 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.