Alert archive / Iowa / Special Weather Statements in 2017

Special Weather Statement, NWS La Crosse, WI

July 10, 2017Howard County, Iowa

NWS La Crosse, WI issued this special weather statement at Jul 10, 2017, 12:31 AM CDT for Howard County, Iowa. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 10, 2017, 12:31 AM CDT (05:31 UTC)
Expired
Jul 10, 2017, 1:00 AM CDT
In force
29 min
Issued by
NWS La Crosse, WI

County Howard County, IA

The radar

The La Crosse radar (KARX), 109 km from the middle of the area, began a volume at 05:32 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

Minneapolis, MN (KMPX), launched 00:00Z, 5.5 hours before the alert went out and 196 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-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 2017-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 627 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2017-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 222 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
627 J/kg
Mixed-layer CIN
-187 J/kg
Mixed-layer LCL
1764 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
222 m²/s²
0-3 km storm-relative helicity
278 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.6

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 10, 12:15 AM CDT, 16 minutes earlier.

Area forecast discussion, Jul 10, 12:15 AM CDT, 16 minutes before
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Hazardous weather outlook, Jul 9, 12:39 PM CDT, 11 hours 52 minutes before
Hazardous Weather Outlook
National Weather Service La Crosse WI
1239 PM CDT Sun Jul 9 2017

IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-
032>034-041>044-053>055-061-101100-
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-
1239 PM CDT Sun Jul 9 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, mainly across
Wisconsin. Severe weather is not expected.

Another round of storms will occur tonight, some of which are
expected to be severe. Damaging winds, heavy rain and hail are
the threats. Timing for the severe storms looks to be after 9 pm,
continuing into the overnight hours. The higher chances for the
severe storms will be southwest of Interstate 94.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

Another round of severe storms could occur late Tuesday afternoon
and Tuesday night. Damaging winds, hail and heavy rain will be the
main threats.

There will be periodic thunderstorm chances into next weekend. It
is too early to discern any severe threats.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be possible for late this evening into the
overnight hours. Rainfall reports are appreciated.

.EMERGENCY MANAGEMENT COORDINATION...

No webinar is scheduled.

04/JM

In the hours before

Special weather statement, Jul 9, 9:49 PM CDT, 2 hours 42 minutes before
Special Weather Statement
National Weather Service La Crosse WI
949 PM CDT Sun Jul 9 2017

MNZ079-086>088-094-095-WIZ032-033-100500-
Wabasha-Dodge-Olmsted-Winona-Mower-Fillmore-Buffalo-Trempealeau-
Including the cities of Wabasha, Dodge Center, Rochester, Winona,
Austin, Preston, Alma, Arcadia, and Whitehall
949 PM CDT Sun Jul 9 2017

...Strong Storms Moving In...

Strong thunderstorms will moves southeast across much of southeast
Minnesota and parts of far western Wisconsin through midnight.
The storms will produce very heavy rainfall, wind gusts to 30 mph,
and possibly small hail.

Some of the storms could become severe with a large hail and
damaging wind threat.

If you have outdoor plans this evening, be prepared to take
shelter inside as these storms approach.
Special weather statement, Jul 9, 10:36 PM CDT, 1 hour 55 minutes before
Special Weather Statement
National Weather Service La Crosse WI
1036 PM CDT Sun Jul 9 2017

IAZ008-009-MNZ079-086>088-094>096-WIZ032>034-041>044-053-100500-
Mitchell-Howard-Wabasha-Dodge-Olmsted-Winona-Mower-Fillmore-
Houston-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau-Adams-
Vernon-
Including the cities of Osage, Cresco, Wabasha, Dodge Center,
Rochester, Winona, Austin, Preston, Caledonia, Alma, Arcadia,
Whitehall, Black River Falls, La Crosse, Sparta, Tomah, Mauston,
Friendship, and Viroqua
1036 PM CDT Sun Jul 9 2017

...Strong Storms Moving In...

Thunderstorms will continue to spread across southeast Minnesota
and portions of western Wisconsin through midnight. Some of the
storms will be strong producing very heavy rainfall, wind gusts to
30 mph, and hail to 1/2 inch.

A few storms could become severe with a large hail and damaging
wind threat.

If you have outdoor plans this evening, be prepared to take
shelter inside as these storms approach.
Local storm report, Jul 9, 11:05 PM CDT, 1 hour 26 minutes before
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Local storm report, Jul 9, 11:19 PM CDT, 1 hour 12 minutes before
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Special weather statement, Jul 10, 12:05 AM CDT, 26 minutes before
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Special weather statement, Jul 10, 12:31 AM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 9, 10:47 PM CDTSevere Thunderstorm WarningARXMonroe43 min
Jul 10, 12:05 AM CDTSpecial Weather StatementARXMitchell25 min
Jul 10, 12:49 AM CDTSpecial Weather StatementARXChickasaw26 min

Nearby

Special Weather Statements in Iowa, 2017Every special weather statement 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.