Alert archive / Minnesota / Special Weather Statements in 2018

Special Weather Statement, NWS La Crosse, WI

August 31, 2018Houston County, Olmsted County, Winona County, Minnesota

NWS La Crosse, WI issued this special weather statement at Aug 31, 2018, 9:32 AM CDT for Houston County, Olmsted County, Winona County, Minnesota. It was in force for 58 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: Aug 31, 2018, 9:32 AM CDT (14:32 UTC)
Expired: Aug 31, 2018, 10:30 AM CDT
In force: 58 min
Issued by: NWS La Crosse, WI

Counties Houston County, MN, Olmsted County, MN, Winona County, MN

The radar

The La Crosse radar (KARX), 77 km from the middle of the area, began a volume at 14:34 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 12:00Z, 2.5 hours before the alert went out and 156 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: 439 J/kg
Mixed-layer CIN: -302 J/kg
Mixed-layer LCL: 920 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 145 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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 Aug 31, 6:06 AM CDT, 3 hours 26 minutes earlier.

Area forecast discussion, Aug 31, 6:06 AM CDT, 3 hours 26 minutes before

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Hazardous weather outlook, Aug 31, 5:01 AM CDT, 4 hours 31 minutes before

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In the hours before

Special weather statement, Aug 31, 7:18 AM CDT, 2 hours 14 minutes before

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Special weather statement, Aug 31, 9:32 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service La Crosse WI
932 AM CDT FRI AUG 31 2018

MNZ079-086>088-095-096-311530-
Wabasha-Olmsted-Dodge-Fillmore-Winona-Houston-
932 AM CDT FRI AUG 31 2018

...THUNDERSTORMS WILL AFFECT WINONA...OLMSTED...SOUTHEASTERN
WABASHA...NORTHERN HOUSTON...EAST CENTRAL DODGE AND NORTHERN
FILLMORE COUNTIES...

At 927 AM CDT, an area of thunderstorms extended from near Rochester
to Saratoga, moving east at 25 mph.

Lightning, nickel size hail, and brief downpours are possible with
these storms.

Take shelter indoors if these storms approach your location.

LAT...LON 4410 9291 4421 9188 4397 9147 4379 9127
      4361 9127 4372 9245 4383 9245 4383 9265
TIME...MOT...LOC 1427Z 270DEG 21KT 4394 9198

DD

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 31, 3:07 PM CDT	Flash Flood Watch	ARX	Crawford, Grant, Richland, Vernon	23 hr

Nearby

Special Weather Statements in Minnesota, 2018 Every special weather statement in 2018

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.