Alert archive / Iowa / Tornado Warnings in 2017
Tornado Warning 4, NWS La Crosse, WI
NWS La Crosse, WI issued this tornado warning at May 15, 2017, 6:46 PM CDT for Winneshiek County, Iowa. It was in force for 44 min. 16 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 15, 2017, 6:46 PM CDT (23:46 UTC)
- Expired
- May 15, 2017, 7:30 PM CDT
- In force
- 44 min
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 2.0 in
County Winneshiek County, IA
The radar
The La Crosse radar (KARX), 92 km from the middle of the area, began a volume at 23:48 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 15, 6:47 PM CDT | TORNADO | 2 Wsw Calmar, IA | TREE DAMAGE EVIDENCE OF A BRIEF LOW-END EF0 TORNADO IN THE LAKE MEYER AREA AND ALONG 265TH AVE FURTHER WEST. |
| May 15, 6:53 PM CDT | TSTM WND DMG | 3 Ne Festina, IA | POSSIBLE TORNADO. COMMODITY SHED COMPLETELY DESTROYED, 30 FT TRAVEL TRAILER TOSSED ACROSS LAWN, SEVERAL OTHER BUILDINGS DAMAGED, LARGE PINE TREE WAS TOPPED AND FOUND 1/4 OF A MILE TO THE EAST IN A FIELD. DAMAGE PATH WITH DEBRIS FROM LOCATION HEADING E/SE FROM |
| May 15, 6:54 PM CDT | TSTM WND DMG | Spillville, IA | LOTS OF TREE DAMAGE REPORTED |
| May 15, 6:54 PM CDT | TSTM WND DMG | Spillville, IA | LOTS OF TREE DAMAGE REPORTED. |
| May 15, 6:54 PM CDT | HAIL 1.5 | Spillville, IA | |
| May 15, 6:55 PM CDT | HAIL 1 | Spillville, IA | |
| May 15, 6:56 PM CDT | TSTM WND DMG | Calmar, IA | TREES DOWN |
| May 15, 6:56 PM CDT | TSTM WND DMG | Calmar, IA | TREES DOWN. |
| May 15, 6:56 PM CDT | TSTM WND GST 82 | Calmar, IA | TIME ESTIMATED FROM RADAR. |
| May 15, 6:57 PM CDT | TSTM WND DMG | Calmar, IA | TREES DOWN. ONE BUILDING WITH SIDING DAMAGE. |
| May 15, 6:59 PM CDT | HAIL 2 | Calmar, IA | |
| May 15, 7:00 PM CDT | TSTM WND DMG | 3 Ne Festina, IA | DELAYED REPORT. SHED DESTROYED, 30 FOOT TRAVEL TRAILER TOSSED ACROSS LAWN, PINE TREE TOPPED. |
| May 15, 7:10 PM CDT | TSTM WND DMG | 3 S Frankville, IA | NUMEROUS TREES DOWN. |
| May 15, 7:10 PM CDT | TSTM WND DMG | 3 Sse Frankville, IA | NUMEROUS TREES DOWN |
| May 15, 7:10 PM CDT | TSTM WND DMG | Ossian, IA | HIGHWAY 52 BLOCKED FROM DOWNED TREES IN OSSIAN |
| May 15, 7:10 PM CDT | TSTM WND DMG | Ossian, IA | HIGHWAY 52 BLOCKED FROM DOWNED TREES IN OSSIAN. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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 15, 5:11 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 11.8 hours before the alert went out and 204 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1352 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 158 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
451
WFUS53 KARX 152346
TORARX
IAC191-160030-
/O.NEW.KARX.TO.W.0004.170515T2346Z-170516T0030Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service La Crosse WI
646 PM CDT MON MAY 15 2017
The National Weather Service in La Crosse has issued a
* Tornado Warning for...
Southern Winneshiek County in northeastern Iowa...
* Until 730 PM CDT
* At 646 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Calmar, or 10 miles southwest of Decorah, moving
east at 20 mph.
HAZARD...Tornado and hail up to two inches in diameter.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
Calmar around 655 PM CDT.
Ossian around 705 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Castalia, Festina, Nordness, Lake Meyer County Park and County Road W
46 And Centennial Road.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4308 9202 4323 9202 4330 9160 4308 9161
TIME...MOT...LOC 2346Z 266DEG 19KT 4318 9191
TORNADO...RADAR INDICATED
HAIL...2.00IN
$$
Wetenkamp3 follow-up statements
017
WWUS53 KARX 152355
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
655 PM CDT MON MAY 15 2017
IAC191-160030-
/O.CON.KARX.TO.W.0004.000000T0000Z-170516T0030Z/
Winneshiek IA-
655 PM CDT MON MAY 15 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR
SOUTHEASTERN WINNESHIEK COUNTY...
At 654 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Calmar, or 10 miles south of Decorah, moving east at
35 mph.
HAZARD...Tornado and two inch hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
Ossian around 700 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Castalia, Festina, Nordness, Lake Meyer County Park and County Road W
46 And Centennial Road.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4308 9196 4324 9196 4330 9160 4308 9161
TIME...MOT...LOC 2354Z 286DEG 32KT 4316 9183
TORNADO...RADAR INDICATED
HAIL...2.00IN
$$
Wetenkamp903
WWUS53 KARX 160004
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
704 PM CDT MON MAY 15 2017
IAC191-160030-
/O.CON.KARX.TO.W.0004.000000T0000Z-170516T0030Z/
Winneshiek IA-
704 PM CDT MON MAY 15 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR
SOUTHEASTERN WINNESHIEK COUNTY...
At 703 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Ossian, or 12 miles south of Decorah, moving east at
50 mph.
HAZARD...Tornado and two inch hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This tornadic thunderstorm will remain over mainly rural areas of
southeastern Winneshiek County, including the following locations:
Castalia, Festina, Frankville and County Road W 46 And Centennial
Road.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4308 9188 4320 9186 4320 9161 4308 9161
TIME...MOT...LOC 0003Z 280DEG 43KT 4313 9171
TORNADO...RADAR INDICATED
HAIL...2.00IN
$$
Wetenkamp936
WWUS53 KARX 160021
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
721 PM CDT MON MAY 15 2017
IAC191-160030-
/O.EXP.KARX.TO.W.0004.000000T0000Z-170516T0030Z/
Winneshiek IA-
721 PM CDT MON MAY 15 2017
...THE TORNADO WARNING FOR SOUTHEASTERN WINNESHIEK COUNTY WILL EXPIRE
AT 730 PM CDT...
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area.
A severe thunderstorm watch remains in effect until 100 AM CDT for
northeastern Iowa.
LAT...LON 4308 9188 4320 9186 4320 9161 4308 9161
TIME...MOT...LOC 0020Z 266DEG 19KT 4314 9159
$$
WetenkampThe office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 15, 3:50 PM CDT | Special Weather Statement | ARX | Mitchell | 55 min |
| May 15, 5:22 PM CDT | Special Weather Statement | ARX | Floyd, Mitchell | 23 min |
| May 15, 5:40 PM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Floyd, Howard, Mitchell | 65 min |
| May 15, 5:55 PM CDT | Severe Thunderstorm Warning | ARX | Winneshiek | 50 min |
| May 15, 6:40 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Chickasaw, Fayette, Winneshiek | 65 min |
Nearby
Tornado Warnings in Iowa, 2017Every tornado warning in 2017Tornadoes in 2017
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.