Alert archive / Wisconsin / Heat Advisories in 2011

Heat Advisory 5, NWS La Crosse, WI

August 1, 20119 counties in Wisconsin; 7 counties in Minnesota; 8 counties in Iowa

NWS La Crosse, WI issued this heat advisory at Aug 1, 2011, 3:39 AM CDT for 9 counties in Wisconsin; 7 counties in Minnesota; 8 counties in Iowa. It took effect at Aug 1, 2011, 1:00 PM CDT. It was in force for 66 min.

The area

The counties it named.

The facts

Issued: Aug 1, 2011, 3:39 AM CDT (08:39 UTC)
In effect from: Aug 1, 2011, 1:00 PM CDT
Expired: Aug 1, 2011, 2:06 PM CDT
In force: 66 min
Issued by: NWS La Crosse, WI

All 24 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, Dodge County, MN, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Buffalo County, WI, Crawford County, WI, Grant County, WI, Jackson 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), 48 km from the middle of the area, began a volume at 08:38 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 00:00Z, 8.7 hours before the alert went out and 304 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: 3181 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 1122 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 162 m²/s²
Significant tornado parameter: 1.8
Supercell composite: 11.0

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 Aug 1, 3:30 AM CDT, 9 minutes earlier.

Area forecast discussion, Aug 1, 3:30 AM CDT, 9 minutes before

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Hazardous weather outlook, Jul 31, 5:00 AM CDT, 22 hours 39 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LA CROSSE WI
500 AM CDT SUN JUL 31 2011

IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-032>034-
041>044-053>055-061-011000-
ADAMS-ALLAMAKEE-BUFFALO-CHICKASAW-CLARK-CLAYTON-CRAWFORD-DODGE-
FAYETTE-FILLMORE-FLOYD-GRANT-HOUSTON-HOWARD-JACKSON-JUNEAU-LA CROSSE-
MITCHELL-MONROE-MOWER-OLMSTED-RICHLAND-TAYLOR-TREMPEALEAU-VERNON-
WABASHA-WINNESHIEK-WINONA-
500 AM CDT SUN JUL 31 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PARTS OF NORTHEAST IOWA...
SOUTHEAST MINNESOTA...AND SOUTHWEST INTO CENTRAL WISCONSIN.

.DAY ONE...TODAY AND TONIGHT

ISOLATED TO SCATTERED THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON
AND EVENING. IF STORMS DEVELOP...THEY COULD BECOME STRONG TO
SEVERE WITH LARGE HAIL AND DAMAGING WINDS BEING THE MAIN THREATS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

SMALL STORM CHANCES WILL CONTINUE ON MONDAY...BUT SEVERE
WEATHER IS NOT ANTICIPATED AT THIS TIME.

A THUNDERSTORM COMPLEX WILL DROP SOUTHEAST ACROSS THE REGION
OVERNIGHT MONDAY...PERSISTING ACROSS NORTHERN PORTIONS OF THE AREA
ON TUESDAY. MEANWHILE...AN ASSOCIATED COLD FRONT WILL SERVE AS THE
FOCUS FOR FURTHER STORM DEVELOPMENT TUESDAY AFTERNOON AND EVENING.
ALL THESE STORMS WILL HAVE THE ABILITY TO BECOME STRONG TO SEVERE.
DAMAGING WINDS...LARGE HAIL...AND FLASH FLOODING FROM HEAVY RAIN
WILL BE THE THREATS.

MORE THUNDERSTORMS WILL BE POSSIBLE ON THURSDAY AND FRIDAY. ITS
TOO EARLY TO DISCERN IF THERE WOULD BE A SEVERE RISK WITH
ANY OF THIS ACTIVITY.

HEAT INDICES COULD REACH 100 TO 105 DEGREES OVER PARTS OF
NORTHEAST IOWA AND SOUTHWEST WISCONSIN ON MONDAY AND TUESDAY. HEAT
ADVISORIES MAY BE NEEDED.

.SPOTTER INFORMATION STATEMENT...

A FEW SPOTTER GROUPS MAY BE NEEDED THIS AFTERNOON AND
EVENING...AND THEN AGAIN TUESDAY.

.EMERGENCY MANAGEMENT COORDINATION...

NO WEBINAR IS SCHEDULED.

RIECK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 8:09 PM CDT	Areal Flood Advisory	ARX	Clark, Jackson	117 min

Nearby

Heat Advisories in Wisconsin, 2011 Heat Advisories in Iowa, 2011 Heat Advisories in Minnesota, 2011 Every heat advisory in 2011

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.