Alert archive / Iowa / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 13, NWS La Crosse, WI

May 10, 2003Winneshiek County, Iowa

NWS La Crosse, WI issued this severe thunderstorm warning at May 10, 2003, 7:27 PM CDT for Winneshiek County, Iowa. It was in force for 33 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: May 10, 2003, 7:27 PM CDT (00:27 UTC)
Expired: May 10, 2003, 8:00 PM CDT
In force: 33 min
Issued by: NWS La Crosse, WI
Area: Counties, with a storm outline in the text

County Winneshiek County, IA

The radar

The La Crosse radar (KARX), 85 km from the middle of the area, began a volume at 00:27 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 watch it was issued in

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

Issued	Product	Office	Lasted
May 10, 6:15 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.5 hours before the alert went out and 209 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: 1566 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 910 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 234 m²/s²
0-3 km storm-relative helicity: 259 m²/s²
Significant tornado parameter: 2.8
Supercell composite: 12.7

Open this sounding in Storm Lab

The text

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

356 
WUUS53 KARX 110027
SVRARX
IAC191-110100-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
726 PM CDT SAT MAY 10 2003

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WINNESHIEK COUNTY IN NORTHEAST IOWA

* UNTIL 800 PM CDT

* AT 726 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED A SEVERE
  THUNDERSTORM 4 MILES SOUTHWEST OF FESTINA...OR ABOUT 9 MILES
  NORTHWEST OF WEST UNION...MOVING NORTH AT 60 MPH. THIS THUNDERSTORM
  HAS A HISTORY OF PRODUCING LARGE HAIL.

* THE SEVERE THUNDERSTORM IS EXPECTED TO BE...
  NEAR NORDNESS AT 735 PM CDT...
  NEAR DECORAH AT 740 PM CDT...
  NEAR LOCUST...AND SATTRE AT 745 PM CDT...
  NEAR HIGHLANDVILLE...AND HESPER AT 750 PM CDT...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT SATURDAY EVENING
FOR NORTHEAST IOWA AND SOUTHWEST WISCONSIN.

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

LAT...LON 4308 9188 4309 9204 4350 9183 4347 9162
          4309 9179

$$

BOYNE

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 7:02 PM CDT	Severe Thunderstorm Warning	ARX	Fayette	28 min
May 10, 8:55 PM CDT	Severe Thunderstorm Warning	ARX	Clayton	35 min
May 10, 9:05 PM CDT	Flash Flood Warning	ARX	Clayton	3 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2003 Every severe thunderstorm warning in 2003

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.