Alert archive / Iowa / Flash Flood Watches in 2019
Flash Flood Watch 7, NWS La Crosse, WI
NWS La Crosse, WI issued this flash flood watch at Sep 18, 2019, 7:38 PM CDT for 4 counties in Wisconsin; Fillmore County, Houston County, Mower County, Minnesota; 8 counties in Iowa. It took effect at Sep 19, 2019, 3:00 AM CDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Sep 18, 2019, 7:38 PM CDT (00:38 UTC)
- In effect from
- Sep 19, 2019, 3:00 AM CDT
- Expired
- Sep 19, 2019, 12:00 PM CDT
- In force
- 9 hr
- Issued by
- NWS La Crosse, WI
- Flood severity
- None
Counties Allamakee County, IA, Chickasaw County, IA, Clayton County, IA, Fayette County, IA, Floyd County, IA, Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Fillmore County, MN, Houston County, MN, Mower County, MN, Crawford County, WI, Grant County, WI, Richland County, WI, Vernon County, WI
The radar
The La Crosse radar (KARX), 74 km from the middle of the area, began a volume at 00:40 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.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 0.6 hours before the alert went out and 210 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
- 1913 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 1145 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 79 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 3.2
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS La Crosse, WI wrote its last area forecast discussion before this flash flood watch went out at Sep 18, 6:55 PM CDT, 43 minutes earlier.
Area forecast discussion, Sep 18, 6:55 PM CDT, 43 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>Hazardous weather outlook, Sep 18, 3:10 PM CDT, 4 hours 28 minutes before
Hazardous Weather Outlook National Weather Service La Crosse WI 310 PM CDT Wed Sep 18 2019 IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029- 032>034-041>044-053>055-061-191200- Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Fayette- Clayton-Wabasha-Dodge-Olmsted-Winona-Mower-Fillmore-Houston- Taylor-Clark-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau- Adams-Vernon-Crawford-Richland-Grant- 310 PM CDT Wed Sep 18 2019 This Hazardous Weather Outlook is for portions of southeast Minnesota...northeast Iowa and southwest into central Wisconsin. .DAY ONE...Tonight Thunderstorms are expected tonight. The main threat with these storms will be locally heavy rainfall, which could lead to some localized flooding if the storms repeat over the same area. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Thunderstorms will continue into Thursday morning, especially along and south of Interstate 90. Heavy rainfall will be the greatest threat, which could lead to localized flooding. Additional chances for thunderstorms will continue Friday through Sunday. At this time, the risk for severe storms appears low, though locally heavy rainfall will be possible into this weekend. .SPOTTER INFORMATION STATEMENT... Rainfall reports would be appreciated along with any reports of flooding. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. NMB
The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 19, 6:42 AM CDT | Flash Flood Warning | ARX | Grant | 5 hr |
| Sep 19, 7:19 AM CDT | Flash Flood Warning | ARX | Monroe, Vernon | 5 hr |
| Sep 19, 7:19 AM CDT | River Flood Warning | ARX | Monroe, Vernon | 24 hr |
| Sep 19, 7:57 AM CDT | River Flood Warning | ARX | Crawford | 4 days |
| Sep 19, 7:57 AM CDT | River Flood Warning | ARX | Crawford | 6 days |
| Sep 19, 7:57 AM CDT | River Flood Warning | ARX | Crawford | 6 days |
| Sep 19, 7:57 AM CDT | River Flood Warning | ARX | Richland, Vernon | 46 hr |
| Sep 19, 7:57 AM CDT | River Flood Warning | ARX | Richland, Vernon | 4 days |
| Sep 19, 7:57 AM CDT | River Flood Warning | ARX | Vernon | 4 days |
| Sep 19, 9:03 AM CDT | Flash Flood Warning | ARX | Grant | 3 hr |
| Sep 19, 11:34 AM CDT | Areal Flood Warning | ARX | Grant | 24 hr |
| Sep 19, 4:00 AM CDT | Flash Flood Warning | ARX | Fillmore | 6 hr |
| Sep 19, 9:58 AM CDT | Areal Flood Warning | ARX | Fillmore, Houston | 3 hr |
Nearby
Flash Flood Watches in Iowa, 2019Flash Flood Watches in Wisconsin, 2019Flash Flood Watches in Minnesota, 2019Every flash flood watch in 2019
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.