Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 32, NWS La Crosse, WI

May 18, 2000Grant County, Wisconsin; Clayton County, Iowa

NWS La Crosse, WI issued this severe thunderstorm warning at May 18, 2000, 5:51 AM CDT for Grant County, Wisconsin; Clayton County, Iowa. It was in force for 39 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: May 18, 2000, 5:51 AM CDT (10:51 UTC)
Expired: May 18, 2000, 6:30 AM CDT
In force: 39 min
Issued by: NWS La Crosse, WI
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Clayton County, IA, Grant County, WI

The radar

The La Crosse radar (KARX), 105 km from the middle of the area, began a volume at 10:54 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.

What was reported inside it

Time	Report	Where	Remark
May 18, 6:23 AM CDT	Hail 0.88	Lancaster, WI

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 10.9 hours before the alert went out and 147 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: 1186 J/kg
Mixed-layer CIN: -178 J/kg
Mixed-layer LCL: 810 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 207 m²/s²
0-3 km storm-relative helicity: 213 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS53 KARX 181052
SVRLSE
IAC043-WIC043-181130-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
551 AM CDT THU MAY 18 2000

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GRANT COUNTY IN SOUTHWEST WISCONSIN
  CLAYTON COUNTY IN NORTHEAST IOWA

* UNTIL 630 AM CDT

* AT 551 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM PRODUCING LARGE HAIL OVER MILLVILLE...OR ABOUT
  4 MILES SOUTH OF GUTTENBERG. THIS ACTIVITY WAS MOVING NORTHEAST AT
  50 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  NEAR CASSVILLE AT 555 AM CDT
  NEAR NORTH ANDOVER AND BEETOWN AT 600 AM CDT
  NEAR FENNIMORE AND STITZER AT 620 AM CDT
  NEAR PRESTON AT 625 AM CDT

LARGE DESTRUCTIVE HAIL IS THE MAIN THREAT WITH THESE STORMS. FOR YOUR
PROTECTION...SEEK SHELTER IN A STURDY BUILDING AND STAY AWAY FROM
WINDOWS.

NELSON

LAT...LON 4285 9135 4263 9112 4295 9044 4317 9063

The office that day

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

Issued	Product	Office	Counties	Lasted
May 18, 5:41 AM CDT	Severe Thunderstorm Warning	ARX	Vernon	34 min
May 18, 6:08 AM CDT	Severe Thunderstorm Warning	ARX	Buffalo, Trempealeau	67 min
May 18, 6:28 AM CDT	Severe Thunderstorm Warning	ARX	Grant	32 min
May 18, 7:12 AM CDT	Severe Thunderstorm Warning	ARX	Vernon	33 min
May 18, 7:33 AM CDT	Severe Thunderstorm Warning	ARX	La Crosse	42 min
May 18, 7:58 AM CDT	Severe Thunderstorm Warning	ARX	Jackson, Monroe	62 min
May 18, 1:20 PM CDT	Severe Thunderstorm Warning	ARX	Grant	40 min
May 18, 2:00 PM CDT	Severe Thunderstorm Warning	ARX	Grant	30 min
May 18, 6:35 AM CDT	Severe Thunderstorm Warning	ARX	Allamakee	55 min
May 18, 12:33 PM CDT	Severe Thunderstorm Warning	ARX	Clayton	57 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2000 Severe Thunderstorm Warnings in Iowa, 2000 Every severe thunderstorm warning in 2000

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.