Alert archive / Iowa / Heat Advisories in 2023

Heat Advisory 2, NWS La Crosse, WI

July 28, 20234 counties in Wisconsin; 8 counties in Iowa

NWS La Crosse, WI issued this heat advisory at Jul 28, 2023, 3:28 AM CDT for 4 counties in Wisconsin; 8 counties in Iowa. It took effect at Jul 28, 2023, 12:00 PM CDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Jul 28, 2023, 3:28 AM CDT (08:28 UTC)
In effect from: Jul 28, 2023, 12:00 PM CDT
Expired: Jul 28, 2023, 7:00 PM CDT
In force: 7 hr
Issued by: NWS La Crosse, WI

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, Crawford County, WI, Grant County, WI, Richland County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 79 km from the middle of the area, began a volume at 08:32 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, 8.5 hours before the alert went out and 243 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: 3091 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 1283 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory 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 heat advisory went out at Jul 28, 3:24 AM CDT, 4 minutes earlier.

Area forecast discussion, Jul 28, 3:24 AM CDT, 4 minutes before

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Hazardous weather outlook, Jul 27, 3:33 AM CDT, 23 hours 55 minutes before

Hazardous Weather Outlook
National Weather Service La Crosse WI
333 AM CDT Thu Jul 27 2023

IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-
032>034-041>044-053>055-061-281245-
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-
333 AM CDT Thu Jul 27 2023

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

.DAY ONE...Today and Tonight

Heat indices in the upper 90s to lower 100s this afternoon and
evening with a heat advisory in effect for most of our region.

Thunderstorms are expected to develop north of I-90 this evening
and overnight. A few storms may be strong to severe with damaging
winds, hail and locally heavy downpours being the primary threats.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Additional storms chances are possible Friday afternoon and
evening for most of our region. Storms may be strong to severe
with damaging winds, hail and heavy downpours possible.

.SPOTTER INFORMATION STATEMENT...

Wind and hail reports would be appreciated. Spotter activation may
be needed at times.

.EMERGENCY MANAGEMENT COORDINATION...

No webinar is scheduled.

Naylor

In the hours before

Special weather statement, Jul 27, 10:45 PM CDT, 4 hours 43 minutes before

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Special weather statement, Jul 27, 11:19 PM CDT, 4 hours 9 minutes before

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Special weather statement, Jul 28, 12:22 AM CDT, 3 hours 6 minutes before

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Special weather statement, Jul 28, 12:24 AM CDT, 3 hours 4 minutes before

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Special weather statement, Jul 28, 1:14 AM CDT, 2 hours 14 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 27, 7:28 PM CDT	Severe Thunderstorm Warning	ARX	Clark, Taylor	77 min
Jul 27, 9:33 PM CDT	Flood Watch	ARX	Buffalo, Clark, Jackson, Taylor, Trempealeau	3 hr
Jul 27, 10:45 PM CDT	Special Weather Statement	ARX	Crawford, Richland, Vernon	60 min
Jul 27, 11:19 PM CDT	Special Weather Statement	ARX	Jackson, La Crosse, Monroe, Trempealeau	56 min
Jul 28, 12:24 AM CDT	Special Weather Statement	ARX	Vernon	66 min
Jul 28, 5:42 PM CDT	Special Weather Statement	ARX	Taylor	63 min
Jul 28, 6:09 PM CDT	Severe Thunderstorm Warning	ARX	Taylor	66 min
Jul 28, 6:13 PM CDT	Severe Thunderstorm Warning	ARX	Grant	47 min
Jul 28, 6:26 PM CDT	Severe Thunderstorm Warning	ARX	Buffalo	49 min
Jul 28, 6:29 PM CDT	Severe Thunderstorm Warning	ARX	Taylor	31 min
Jul 28, 6:55 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ARX	Trempealeau	50 min
Jul 28, 12:22 AM CDT	Special Weather Statement	ARX	Fillmore	53 min
Jul 28, 1:14 AM CDT	Special Weather Statement	ARX	Houston	46 min

Nearby

Heat Advisories in Iowa, 2023 Heat Advisories in Wisconsin, 2023 Every heat advisory in 2023

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.