Alert archive / Wisconsin / Flash Flood Watches in 2021
Flash Flood Watch 1, NWS La Crosse, WI
NWS La Crosse, WI issued this flash flood watch at Aug 7, 2021, 6:18 PM CDT for Allamakee County, Winneshiek County, Iowa; 11 counties in Wisconsin; 5 counties in Minnesota. It was in force for 35 hr.
The area
The counties it named.
The facts
- Issued
- Aug 7, 2021, 6:18 PM CDT (23:18 UTC)
- Expired
- Aug 9, 2021, 5:11 AM CDT
- In force
- 35 hr
- Issued by
- NWS La Crosse, WI
- Flood severity
- None
Counties Allamakee County, IA, Winneshiek County, IA, Fillmore County, MN, Houston County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Adams County, WI, Buffalo County, WI, Clark County, WI, Crawford County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Monroe County, WI, Richland County, WI, Trempealeau County, WI, Vernon County, WI
The radar
The La Crosse radar (KARX), 7 km from the middle of the area, began a volume at 23:16 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
Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.3 hours before the alert went out and 256 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
- 20 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 656 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
331 WGUS63 KARX 072318 FFAARX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service La Crosse WI 618 PM CDT Sat Aug 7 2021 .A storm system to our west will move in overnight with additional rounds of thunderstorms. Heavy rainfall of 1 to 3 inches of rainfall fell over a large area over southeast Minnesota, western and north central Wisconsin, and parts of northeast Iowa with pockets of 3 to 7 inches of rainfall especially along the I90 and I94 corridors and into west central Wisconsin. Thunderstorms are expected to re-develop tonight in an east-west line, affecting some of the same locations that received heavy rainfall Saturday. IAZ010-011-MNZ079-087-088-095-096-WIZ029-032>034-041>044-053>055- 080730- /O.NEW.KARX.FF.A.0001.210807T2318Z-210808T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Winneshiek-Allamakee-Wabasha-Olmsted-Winona-Fillmore-Houston-Clark- Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau-Adams-Vernon- Crawford-Richland- Including the cities of Arcadia, Richland Center, Rochester, Waukon, Neillsville, Whitehall, Friendship, Preston, Sparta, Prairie Du Chien, Viroqua, La Crosse, Winona, Decorah, Black River Falls, Tomah, Caledonia, Wabasha, Mauston, and Alma 618 PM CDT Sat Aug 7 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH SUNDAY MORNING... The National Weather Service in La Crosse has issued a * Flash Flood Watch for portions of northeast Iowa, southeast Minnesota and Wisconsin, including the following areas, in northeast Iowa, Allamakee and Winneshiek. In southeast Minnesota, Fillmore, Houston, Olmsted, Wabasha and Winona. In Wisconsin, Adams, Buffalo, Clark, Crawford, Jackson, Juneau, La Crosse, Monroe, Richland, Trempealeau and Vernon. * Through Sunday morning. * Heavy rainfall of 1 to 3 inches of rainfall fell over a large area over southeast Minnesota, western and north central Wisconsin, and parts of northeast Iowa with pockets of 3 to 7 inches of rainfall especially along the I90 and I94 corridors and into west central Wisconsin. Thunderstorms are expected to re-develop tonight in an east-west line, affecting some of the same locations that received heavy rainfall Saturday. 1 to 4 inches of additional rainfall may fall over parts of the flash flood watch area. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ CZ
6 follow-up statements
288 WGUS63 KARX 080405 FFAARX Flood Watch National Weather Service La Crosse WI 1105 PM CDT Sat Aug 7 2021 .Saturday evening, a warm front remained draped from near Rochester toward Preston to near Boscobel and Lone Rock. Storms are expected to re-develop overnight as a storm system moves in from the west. The storm system will tap a moist and unstable atmosphere. These storms will be efficient rain producers. Due to the heavy rainfall potential on already saturated soils, additional rainfall may produce flash flooding. IAZ010-011-MNZ079-087-088-095-096-WIZ029-032>034-041>044-053>055- 081500- /O.CON.KARX.FF.A.0001.000000T0000Z-210808T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Winneshiek-Allamakee-Wabasha-Olmsted-Winona-Fillmore-Houston-Clark- Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau-Adams-Vernon- Crawford-Richland- Including the cities of Arcadia, Richland Center, Rochester, Waukon, Neillsville, Whitehall, Friendship, Preston, Sparta, Prairie Du Chien, Viroqua, La Crosse, Winona, Decorah, Black River Falls, Tomah, Caledonia, Wabasha, Mauston, and Alma 1105 PM CDT Sat Aug 7 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 10 AM CDT SUNDAY... The Flash Flood Watch continues for * Portions of northeast Iowa, southeast Minnesota and Wisconsin, including the following areas, in northeast Iowa, Allamakee and Winneshiek. In southeast Minnesota, Fillmore, Houston, Olmsted, Wabasha and Winona. In Wisconsin, Adams, Buffalo, Clark, Crawford, Jackson, Juneau, La Crosse, Monroe, Richland, Trempealeau and Vernon. * Until 10 AM CDT Sunday. * Heavy rainfall from 1 to 7 inches fell over parts of southeast Minnesota, western and north central Wisconsin, and parts of northeast Iowa. Some locations cannot take much additional rain and heavy rainfall is likely overnight. The storms will be capable of 1 to 2 inch per hour rainfall rates. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ CZ
401 WGUS63 KARX 080826 FFAARX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service La Crosse WI 326 AM CDT Sun Aug 8 2021 IAZ010-011-MNZ079-087-088-095-096-WIZ029-032>034-041>044-053>055- 081630- /O.EXT.KARX.FF.A.0001.000000T0000Z-210809T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Winneshiek-Allamakee-Wabasha-Olmsted-Winona-Fillmore-Houston-Clark- Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau-Adams-Vernon- Crawford-Richland- Including the cities of Arcadia, Richland Center, Rochester, Waukon, Neillsville, Whitehall, Friendship, Preston, Sparta, Prairie Du Chien, Viroqua, La Crosse, Winona, Decorah, Black River Falls, Tomah, Caledonia, Wabasha, Mauston, and Alma 326 AM CDT Sun Aug 8 2021 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH LATE TONIGHT... The Flash Flood Watch is now in effect for * Portions of northeast Iowa, southeast Minnesota and Wisconsin, including the following areas, in northeast Iowa, Allamakee and Winneshiek. In southeast Minnesota, Fillmore, Houston, Olmsted, Wabasha and Winona. In Wisconsin, Adams, Buffalo, Clark, Crawford, Jackson, Juneau, La Crosse, Monroe, Richland, Trempealeau and Vernon. * Through late tonight. * Heavy rainfall over the past 24 hours has resulted in saturated soils. Additional rounds of rain are expected into tonight, with high rainfall rates of 1 to 2 inches per hour possible with any storms. The rainfall could quickly result in flash flooding in these areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ JAM
370 WGUS63 KARX 081507 FFAARX Flood Watch National Weather Service La Crosse WI 1007 AM CDT Sun Aug 8 2021 IAZ010-011-MNZ079-087-088-095-096-081615- /O.CAN.KARX.FF.A.0001.000000T0000Z-210809T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Winneshiek-Allamakee-Wabasha-Olmsted-Winona-Fillmore-Houston- Including the cities of Rochester, Waukon, Preston, Winona, Decorah, Caledonia, and Wabasha 1007 AM CDT Sun Aug 8 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of northeast Iowa and southeast Minnesota, including the following areas, in northeast Iowa, Allamakee and Winneshiek. In southeast Minnesota, Fillmore, Houston, Olmsted, Wabasha and Winona has been cancelled. The Flood Watch is cancelled. At this time, it looks like any additional storms with heavy rain will primarily be east of the Mississippi River later today. $$ WIZ029-032>034-041>044-053>055-082315- /O.CON.KARX.FF.A.0001.000000T0000Z-210809T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Clark-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau-Adams- Vernon-Crawford-Richland- Including the cities of Arcadia, Richland Center, Black River Falls, Alma, Neillsville, Whitehall, Prairie Du Chien, Sparta, Viroqua, La Crosse, Tomah, Friendship, and Mauston 1007 AM CDT Sun Aug 8 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... The Flash Flood Watch continues for * Portions of central Wisconsin, southwest Wisconsin and west central Wisconsin, including the following areas, in central Wisconsin, Adams, Clark and Juneau. In southwest Wisconsin, Crawford, Richland and Vernon. In west central Wisconsin, Buffalo, Jackson, La Crosse, Monroe and Trempealeau. * Through late tonight. * Heavy rainfall Saturday afternoon and evening resulted in saturated soils. Additional storms with heavy rain will be possible this afternoon into the evening, with rainfall rates of 1 to 2 inches per hour possible. This rainfall could quickly result in flash floodig. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ 04
711 WGUS63 KARX 082358 FFAARX Flood Watch National Weather Service La Crosse WI 658 PM CDT Sun Aug 8 2021 WIZ029-032>034-041>044-053>055-090600- /O.CON.KARX.FF.A.0001.000000T0000Z-210809T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Clark-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau-Adams- Vernon-Crawford-Richland- Including the cities of Neillsville, Alma, Arcadia, Whitehall, Black River Falls, La Crosse, Sparta, Tomah, Mauston, Friendship, Viroqua, Prairie Du Chien, and Richland Center 658 PM CDT Sun Aug 8 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 1 AM CDT MONDAY... The Flash Flood Watch continues for * Portions of central Wisconsin, southwest Wisconsin, and west central Wisconsin, including the following areas, in central Wisconsin, Adams, Clark, and Juneau. In southwest Wisconsin, Crawford, Richland, and Vernon. In west central Wisconsin, Buffalo, Jackson, La Crosse, Monroe, and Trempealeau. * Until 1 AM CDT Monday * Heavy rainfall Saturday afternoon and evening resulted in saturated soils. Additional storms with heavy rain will be possible into the evening, with rainfall rates of 1 to 2 inches per hour possible and would mostly run off. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Zapotocny
803 WGUS63 KARX 090436 FFAARX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service La Crosse WI 1136 PM CDT Sun Aug 8 2021 WIZ029-032>034-041>044-053>055-091200- /O.EXT.KARX.FF.A.0001.000000T0000Z-210809T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Clark-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau-Adams- Vernon-Crawford-Richland- Including the cities of Neillsville, Alma, Arcadia, Whitehall, Black River Falls, La Crosse, Sparta, Tomah, Mauston, Friendship, Viroqua, Prairie Du Chien, and Richland Center 1136 PM CDT Sun Aug 8 2021 ...FLASH FLOOD WATCH NOW IN EFFECT UNTIL 7 AM CDT MONDAY... The Flash Flood Watch is now in effect for * Portions of central Wisconsin, southwest Wisconsin, and west central Wisconsin, including the following areas, in central Wisconsin, Adams, Clark, and Juneau. In southwest Wisconsin, Crawford, Richland, and Vernon. In west central Wisconsin, Buffalo, Jackson, La Crosse, Monroe, and Trempealeau. * Until 7 AM CDT Monday * Heavy rainfall Saturday and Sunday resulted in saturated soils. Pockets of locally heavy rainfall with rainfall rates of 1 to 2 inches per hour will continue tonight with flash flooding possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Zapotocny
411 WGUS63 KARX 091011 FFAARX Flood Watch National Weather Service La Crosse WI 511 AM CDT Mon Aug 9 2021 WIZ029-032>034-041>044-053>055-091115- /O.CAN.KARX.FF.A.0001.000000T0000Z-210809T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Clark-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau-Adams- Vernon-Crawford-Richland- Including the cities of Arcadia, Richland Center, Black River Falls, Alma, Neillsville, Whitehall, Prairie Du Chien, Sparta, Viroqua, La Crosse, Tomah, Friendship, and Mauston 511 AM CDT Mon Aug 9 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of central Wisconsin, southwest Wisconsin and west central Wisconsin, including the following areas, in central Wisconsin, Adams, Clark and Juneau. In southwest Wisconsin, Crawford, Richland and Vernon. In west central Wisconsin, Buffalo, Jackson, La Crosse, Monroe and Trempealeau has been cancelled. The Flood Watch is cancelled. Although showers and storms will continue for a few more hours, the likelihood of flooding is decreasing. Please continue to heed remaining road closures. $$ JAM
The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 6:26 AM CDT | Special Weather Statement | ARX | Buffalo | 34 min |
| Aug 7, 7:40 AM CDT | Special Weather Statement | ARX | La Crosse | 35 min |
| Aug 7, 9:17 AM CDT | Special Weather Statement | ARX | Juneau | 28 min |
| Aug 7, 10:12 AM CDT | Special Weather Statement | ARX | Adams | 33 min |
| Aug 7, 11:17 AM CDT | Special Weather Statement | ARX | Crawford | 28 min |
| Aug 7, 11:24 AM CDT | Severe Thunderstorm Warning | ARX | La Crosse, Vernon | 27 min |
| Aug 7, 11:26 AM CDT | Severe Thunderstorm Warning | ARX | Crawford, Richland, Vernon | 21 min |
| Aug 7, 12:19 PM CDT | Special Weather Statement | ARX | Richland | 26 min |
| Aug 7, 12:59 PM CDT | Areal Flood Advisory | ARX | Buffalo | 2 hr |
| Aug 7, 1:17 PM CDT | Severe Thunderstorm Warning | ARX | Richland, Vernon | 58 min |
| Aug 7, 1:48 PM CDT | Special Weather Statement | ARX | La Crosse | 27 min |
| Aug 7, 2:14 PM CDT | Special Weather Statement | ARX | La Crosse | 31 min |
| Aug 7, 2:23 PM CDT | Areal Flood Advisory | ARX | La Crosse, Trempealeau | 112 min |
| Aug 7, 3:02 PM CDT | River Flood Warning | ARX | Monroe, Vernon | 21 days |
| Aug 7, 3:02 PM CDT | River Flood Warning | ARX | Vernon | 4 days |
| Aug 7, 3:02 PM CDT | River Flood Warning | ARX | Richland, Vernon | 4 days |
| Aug 7, 3:02 PM CDT | River Flood Warning | ARX | Richland, Vernon | 61 hr |
| Aug 7, 3:02 PM CDT | River Flood Warning | ARX | Buffalo, Trempealeau | 19 hr |
| Aug 7, 3:07 PM CDT | Areal Flood Advisory | ARX | La Crosse | 74 min |
| Aug 7, 3:17 PM CDT | Special Weather Statement | ARX | Vernon | 73 min |
| Aug 7, 3:23 PM CDT | Flash Flood Warning | ARX | La Crosse, Monroe | 3 hr |
| Aug 7, 3:35 PM CDT | Severe Thunderstorm Warning | ARX | Vernon | 55 min |
| Aug 7, 3:52 PM CDT | Severe Thunderstorm Warning | ARX | Crawford | 38 min |
| Aug 7, 4:00 PM CDT | Tornado Warning | ARX | Crawford | 30 min |
| Aug 7, 4:05 PM CDT | Severe Thunderstorm Warning | ARX | Richland | 40 min |
| Aug 7, 4:19 PM CDT | Tornado Warning | ARX | Crawford, Grant | 41 min |
| Aug 7, 4:27 PM CDT | Flash Flood Warning | ARX | Vernon | 3 hr |
| Aug 7, 4:56 PM CDT | Tornado Warning | ARX | Grant | 19 min |
| Aug 7, 5:53 PM CDT | Severe Thunderstorm Warning | ARX | Juneau, Monroe, Vernon | 37 min |
| Aug 7, 7:21 AM CDT | Special Weather Statement | ARX | Winona | 24 min |
| Aug 7, 10:29 AM CDT | Special Weather Statement | ARX | Olmsted | 31 min |
| Aug 7, 10:33 AM CDT | Severe Thunderstorm Warning | ARX | Dodge, Olmsted, Wabasha | 42 min |
| Aug 7, 11:14 AM CDT | Special Weather Statement | ARX | Wabasha | 31 min |
| Aug 7, 12:12 PM CDT | Special Weather Statement | ARX | Wabasha | 18 min |
| Aug 7, 12:23 PM CDT | Special Weather Statement | ARX | Olmsted | 37 min |
Nearby
Flash Flood Watches in Wisconsin, 2021Flash Flood Watches in Minnesota, 2021Flash Flood Watches in Iowa, 2021Every flash flood watch in 2021
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.