Alert archive / Iowa / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 5, NWS La Crosse, WI

May 11, 2000Clayton County, Fayette County, Iowa

NWS La Crosse, WI issued this severe thunderstorm warning at May 11, 2000, 7:05 AM CDT for Clayton County, Fayette County, Iowa. It was in force for 55 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 11, 2000, 7:05 AM CDT (12:05 UTC)
Expired: May 11, 2000, 8:00 AM CDT
In force: 55 min
Issued by: NWS La Crosse, WI
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Clayton County, IA, Fayette County, IA

What was reported inside it

Time	Report	Where	Remark
May 11, 7:17 AM CDT	Hail 0.75	Strawberry Pt, IA

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 11, 5:00 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 0.1 hours before the alert went out and 165 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 938 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 172 m²/s²
0-3 km storm-relative helicity: 291 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

973 
WUUS53 KARX 111206
SVRLSE
IAC043-065-111300-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
705 AM CDT THU MAY 11 2000

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN FAYETTE COUNTY IN NORTHEAST IOWA
  CLAYTON COUNTY IN NORTHEAST IOWA

* UNTIL 800 AM CDT

* AT 701 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN
  AREA OF SEVERE THUNDERSTORMS PRODUCING LARGE HAIL ALONG A LINE
  EXTENDING FROM 15 MILES SOUTHWEST OF DECORAH THROUGH THE OELWEIN
  AREA. IT WAS MOVING NORTHEAST AT 50 MPH. HAIL HAS BEEN REPORTED IN
  OELWEIN DURING THE PAST 15 MINUTES.

* SEVERE THUNDERSTORMS WILL BE...
  NEAR GUNDER AROUND 705 AM CDT
  NEAR LITTLEPORT AND ELKADER AT 710 AM CDT
  NEAR GARBER AND ELKPORT AT 715 AM CDT
  NEAR GARNAVILLO AT 720 AM CDT
  NEAR MCGREGOR AROUND 725 AM CDT

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND GUSTS IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR
YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF
YOUR HOME OR BUSINESS.

SHEA

LAT...LON 4307 9179 4288 9180 4263 9190 4263 9125
          4284 9110 4308 9118

Nearby

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.