Alert archive / Iowa / Areal Flood Warnings in 2017

Areal Flood Warning 7, NWS La Crosse, WI

July 12, 2017Clayton County, Iowa

NWS La Crosse, WI issued this areal flood warning at Jul 12, 2017, 4:22 AM CDT for Clayton County, Iowa. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 12, 2017, 4:22 AM CDT (09:22 UTC)
Expired: Jul 12, 2017, 10:15 AM CDT
In force: 6 hr
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Emergency: Emergency
Flood severity: None

County Clayton County, IA

The radar

The La Crosse radar (KARX), 109 km from the middle of the area, began a volume at 09:21 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, 9.4 hours before the alert went out and 153 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1096 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 755 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 268 m²/s²
0-3 km storm-relative helicity: 315 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 7.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning 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 areal flood warning went out at Jul 12, 3:37 AM CDT, 45 minutes earlier.

Area forecast discussion, Jul 12, 3:37 AM CDT, 45 minutes before

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Hazardous weather outlook, Jul 11, 12:20 PM CDT, 16 hours 2 minutes before

Hazardous Weather Outlook
National Weather Service La Crosse WI
1220 PM CDT Tue Jul 11 2017

IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-032-
054-061-121100-
Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Fayette-
Clayton-Wabasha-Dodge-Olmsted-Winona-Mower-Fillmore-Houston-
Taylor-Clark-Buffalo-Crawford-Grant-
1220 PM CDT Tue Jul 11 2017

This Hazardous Weather Outlook is for portions of southeast
Minnesota...northeast Iowa and southwest into central Wisconsin.

.DAY ONE...This Afternoon and Tonight

Scattered thunderstorms are possible this afternoon. Severe
weather is not expected.

Thunderstorms are likely across the area later this evening and
overnight. A few of these could be strong to severe. Heavy rain is
possible with any storm, which could result in localized flooding
and rises on rivers and streams. Hail and damaging winds are also
possible.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Thunderstorms chances continue on Wednesday, mainly south and east
of La Crosse. A few of these could be strong with gusty winds and
small hail.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be requested tonight. Rainfall reports are
appreciated.

.EMERGENCY MANAGEMENT COORDINATION...

No webinar is scheduled.

WIZ033-034-041>044-053-055-121100-
Trempealeau-Jackson-La Crosse-Monroe-Juneau-Adams-Vernon-Richland-
1220 PM CDT Tue Jul 11 2017

This Hazardous Weather Outlook is for portions of central
Wisconsin...southwest Wisconsin and west central Wisconsin.

.DAY ONE...This Afternoon and Tonight

Scattered thunderstorms are possible this afternoon. Severe
weather is not expected.

A flash flood watch is in effect for much of tonight.
Thunderstorms are likely across the area later this evening and
overnight. A few of these could be strong to severe. Heavy rain is
possible with any storm, which could result in flash flooding and
rises on rivers and streams. Hail and damaging winds are also
possible.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Thunderstorms chances continue on Wednesday, mainly south and east
of La Crosse. A few of these could be strong with gusty winds and
small hail.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be requested tonight. Rainfall reports are
appreciated.

.EMERGENCY MANAGEMENT COORDINATION...

No webinar is scheduled.

04/Boyne

In the hours before

Local storm report, Jul 12, 2:38 AM CDT, 1 hour 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
238 AM CDT WED JUL 12 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0235 AM     HEAVY RAIN       4 W NORTH BUENA VISTA   42.69N 91.04W
07/12/2017  M8.25 INCH       CLAYTON            IA   PUBLIC

            RELAYED VIA LAW ENFORCEMENT.

&&

CJA

Local storm report, Jul 12, 2:56 AM CDT, 1 hour 26 minutes before

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Local storm report, Jul 12, 3:02 AM CDT, 1 hour 20 minutes before

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Local storm report, Jul 12, 3:03 AM CDT, 1 hour 19 minutes before

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Special weather statement, Jul 12, 3:06 AM CDT, 1 hour 16 minutes before

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Special weather statement, Jul 12, 3:39 AM CDT, 43 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 8:04 PM CDT	Special Weather Statement	ARX	Grant	71 min
Jul 11, 8:51 PM CDT	Special Weather Statement	ARX	Grant	24 min
Jul 11, 9:26 PM CDT	Areal Flood Advisory	ARX	Grant	3 hr
Jul 11, 9:44 PM CDT	Severe Thunderstorm Warning	ARX	Grant	61 min
Jul 11, 11:42 PM CDT	Flash Flood Warning	ARX	Grant	3 hr
Jul 12, 12:34 AM CDT	Flash Flood Warning	ARX	Grant	3 hr
Jul 12, 2:47 AM CDT	Areal Flood Warning	ARX	Grant	3 hr
Jul 12, 6:03 AM CDT	Special Weather Statement	ARX	Crawford, Richland, Vernon	42 min
Jul 12, 6:26 AM CDT	Special Weather Statement	ARX	Juneau, Vernon	34 min
Jul 12, 9:53 AM CDT	Severe Thunderstorm Warning	ARX	Grant	31 min
Jul 12, 3:40 PM CDT	Special Weather Statement	ARX	Clark, Taylor	65 min
Jul 12, 4:42 PM CDT	Special Weather Statement	ARX	Clark	63 min
Jul 12, 5:08 PM CDT	Special Weather Statement	ARX	Taylor	37 min
Jul 12, 6:11 PM CDT	Severe Thunderstorm Warning	ARX	Juneau, Monroe, Richland, Vernon	36 min
Jul 12, 6:58 PM CDT	Special Weather Statement	ARX	La Crosse	62 min
Jul 11, 7:46 PM CDT	Special Weather Statement	ARX	Clayton	44 min
Jul 11, 8:35 PM CDT	Special Weather Statement	ARX	Clayton	70 min
Jul 11, 9:14 PM CDT	Special Weather Statement	ARX	Allamakee	46 min
Jul 11, 9:19 PM CDT	Tornado Warning	ARX	Clayton	26 min
Jul 11, 10:12 PM CDT	Tornado Warning	ARX	Clayton	18 min
Jul 11, 10:14 PM CDT	Flash Flood Warning Emergency	ARX	Clayton	6 hr
Jul 12, 1:40 AM CDT	River Flood Warning	ARX	Clayton	24 hr
Jul 12, 1:40 AM CDT	River Flood Warning	ARX	Clayton	24 hr
Jul 12, 8:44 AM CDT	Special Weather Statement	ARX	Chickasaw, Clayton, Fayette	31 min
Jul 12, 9:13 AM CDT	Special Weather Statement	ARX	Clayton	17 min
Jul 12, 9:18 AM CDT	Severe Thunderstorm Warning	ARX	Clayton	42 min
Jul 12, 9:44 AM CDT	Severe Thunderstorm Warning	ARX	Clayton	22 min
Jul 12, 10:12 AM CDT	Areal Flood Warning	ARX	Clayton	3 hr
Jul 12, 5:46 PM CDT	Severe Thunderstorm Warning	ARX	Fayette	26 min

Nearby

Areal Flood Warnings in Iowa, 2017 Every areal flood warning in 2017

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.