Alert archive / Iowa / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 13, NWS La Crosse, WI
NWS La Crosse, WI issued this severe thunderstorm warning at May 11, 2000, 8:50 PM CDT for Winneshiek County, Iowa. It was in force for 40 min. 2 reports 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, 8:50 PM CDT (01:50 UTC)
- Expired
- May 11, 2000, 9:30 PM CDT
- In force
- 40 min
- Issued by
- NWS La Crosse, WI
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Winneshiek County, IA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 11, 9:00 PM CDT | Hail 0.75 | Decorah, IA | |
| May 11, 9:05 PM CDT | Hail 0.75 | Calmar, 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, 6:45 PM CDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 1.8 hours before the alert went out and 212 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.
- Mixed-layer CAPE
- 2323 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 1261 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 171 m²/s²
- 0-3 km storm-relative helicity
- 218 m²/s²
- Significant tornado parameter
- 1.8
- Supercell composite
- 13.9
The text
As transmitted, in the capitals the NWS used until 2016.
167 WUUS53 KARX 120150 SVRLSE IAC191-120230- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE LA CROSSE WI 850 PM CDT THU MAY 11 2000 THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WINNESHIEK COUNTY IN NORTHEAST IOWA * UNTIL 930 PM CDT * AT 850 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 4 MILES SOUTHWEST OF SPILLVILLE...OR ABOUT 14 MILES SOUTHWEST OF DECORAH. THIS ACTIVITY WAS MOVING EAST AT 30 MPH. * THE SEVERE THUNDERSTORM WILL BE... NEAR FORT ATKINSON AND SPILLVILLE AT 850 PM CDT NEAR CONOVER AT 855 PM CDT NEAR CALMAR AT 900 PM CDT A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. REMEMBER... SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCED WARNING. WELVAERT LAT...LON 4329 9211 4307 9206 4309 9161 4335 9162
The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 7:00 PM CDT | Severe Thunderstorm Warning | ARX | Chickasaw | 30 min |
| May 11, 7:15 PM CDT | Severe Thunderstorm Warning | ARX | Fayette | 60 min |
| May 11, 7:58 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 62 min |
| May 11, 8:12 PM CDT | Severe Thunderstorm Warning | ARX | Fayette | 78 min |
| May 11, 8:25 PM CDT | Tornado Warning | ARX | Clayton | 35 min |
| May 12, 6:13 AM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Winneshiek | 32 min |
| May 12, 6:43 AM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 62 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2000Every 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.