Alert archive / Iowa / Tornado Warnings in 2017
Tornado Warning 39, NWS Quad Cities, IA
NWS Quad Cities, IA issued this tornado warning at May 27, 2017, 4:40 PM CDT for Keokuk County, Washington County, Iowa. It was in force for 50 min. 3 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 27, 2017, 4:40 PM CDT (21:40 UTC)
- Expired
- May 27, 2017, 5:30 PM CDT
- In force
- 50 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.0 in
Counties Keokuk County, IA, Washington County, IA
The radar
The Quad Cities radar (KDVN), 136 km from the middle of the area, began a volume at 21:42 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 27, 5:01 PM CDT | FUNNEL CLOUD | 5 Ne Richland, IA | FUNNEL CLOUD AND WALL CLOUD VISIBLE WELL TO THE NORTHWEST FROM HIGHWAY 1 IN SOUTHEAST WASHINGTON COUNTY. LOCATION APPROXIMATE. |
| May 27, 5:08 PM CDT | HAIL 1.25 | 5 Ne Sigourney, IA | JUST EAST OF LAKE BELVA DEER STATE PARK. QUARTER TO HALF DOLLAR SIZE HAIL. |
| May 27, 5:22 PM CDT | TORNADO 0 | 3 S Harper, IA | VIDEO EVIDENCE OF BRIEF TOUCHDOWN. NO KNOWN DAMAGE PATH OR DEGREE OF DAMAGE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 9.7 hours before the alert went out and 142 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
- 703 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- -16 m²/s²
- 0-3 km storm-relative helicity
- 33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
063
WFUS53 KDVN 272140
TORDVN
IAC107-183-272230-
/O.NEW.KDVN.TO.W.0039.170527T2140Z-170527T2230Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
440 PM CDT SAT MAY 27 2017
The National Weather Service in the Quad Cities has issued a
* Tornado Warning for...
Central Keokuk County in southeastern Iowa...
West central Washington County in southeastern Iowa...
* Until 530 PM CDT
* At 440 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Sigourney, moving east at 30 mph.
HAZARD...Tornado and quarter size 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...
Sigourney around 445 PM CDT.
Harper around 500 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Yenruogis County Park, Keota, Sigourney Iowa Airport, Sig-Nor Field
Airport, Lancaster, Talleyrand, Keokuk County Expo, Lake Belva Deer
Park and Webster.
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 4126 9235 4144 9235 4143 9188 4123 9189
TIME...MOT...LOC 2140Z 271DEG 25KT 4135 9226
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$
ERVIN11 follow-up statements
009
WWUS53 KDVN 272144
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
444 PM CDT SAT MAY 27 2017
IAC107-183-272230-
/O.CON.KDVN.TO.W.0039.000000T0000Z-170527T2230Z/
Keokuk IA-Washington IA-
444 PM CDT SAT MAY 27 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR CENTRAL
KEOKUK AND WEST CENTRAL WASHINGTON COUNTIES...
At 444 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Sigourney, moving east at 30 mph.
HAZARD...Tornado and golf ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
Harper around 500 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Yenruogis County Park, Keota, Sigourney Iowa Airport, Sig-Nor Field
Airport, Lancaster, Talleyrand, Keokuk County Expo, Lake Belva Deer
Park and Webster.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4126 9235 4144 9235 4143 9188 4123 9189
TIME...MOT...LOC 2144Z 267DEG 25KT 4135 9222
TORNADO...RADAR INDICATED
HAIL...1.75IN
$$
ERVIN894
WWUS53 KDVN 272147
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
447 PM CDT SAT MAY 27 2017
IAC107-183-272230-
/O.CON.KDVN.TO.W.0039.000000T0000Z-170527T2230Z/
Keokuk IA-Washington IA-
447 PM CDT SAT MAY 27 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR CENTRAL
KEOKUK AND WEST CENTRAL WASHINGTON COUNTIES...
At 447 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Sigourney, moving east at 15 mph.
HAZARD...Tornado and golf ball size 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...
Sigourney around 450 PM CDT.
Harper around 515 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Yenruogis County Park, Keota, Sigourney Iowa Airport, Sig-Nor Field
Airport, Lancaster, Talleyrand, Keokuk County Expo, Lake Belva Deer
Park and Webster.
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 4126 9235 4144 9235 4143 9188 4123 9189
TIME...MOT...LOC 2147Z 270DEG 15KT 4135 9222
TORNADO...RADAR INDICATED
HAIL...1.75IN
$$
ERVIN864
WWUS53 KDVN 272151
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
451 PM CDT SAT MAY 27 2017
IAC107-183-272230-
/O.CON.KDVN.TO.W.0039.000000T0000Z-170527T2230Z/
Keokuk IA-Washington IA-
451 PM CDT SAT MAY 27 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR CENTRAL
KEOKUK AND WEST CENTRAL WASHINGTON COUNTIES...
At 451 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Sigourney, moving east at 15 mph.
HAZARD...Tornado and golf ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
Harper around 515 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Yenruogis County Park, Keota, Sigourney Iowa Airport, Sig-Nor Field
Airport, Lancaster, Talleyrand, Keokuk County Expo, Lake Belva Deer
Park and Webster.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4127 9230 4144 9231 4143 9188 4123 9189
TIME...MOT...LOC 2151Z 270DEG 15KT 4135 9220
TORNADO...RADAR INDICATED
HAIL...1.75IN
$$
ERVIN016
WWUS53 KDVN 272155
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
455 PM CDT SAT MAY 27 2017
IAC107-183-272230-
/O.CON.KDVN.TO.W.0039.000000T0000Z-170527T2230Z/
Keokuk IA-Washington IA-
455 PM CDT SAT MAY 27 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR CENTRAL
KEOKUK AND WEST CENTRAL WASHINGTON COUNTIES...
At 455 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Sigourney, moving east at 20 mph.
HAZARD...Tornado and golf ball size 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...
Harper around 515 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Yenruogis County Park, Keota, Sigourney Iowa Airport, Sig-Nor Field
Airport, Lancaster, Talleyrand, Keokuk County Expo, Lake Belva Deer
Park and Webster.
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 4127 9230 4144 9231 4143 9188 4123 9189
TIME...MOT...LOC 2155Z 275DEG 15KT 4134 9217
TORNADO...RADAR INDICATED
HAIL...1.75IN
$$
ERVIN946
WWUS53 KDVN 272200
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
500 PM CDT SAT MAY 27 2017
IAC107-183-272230-
/O.CON.KDVN.TO.W.0039.000000T0000Z-170527T2230Z/
Keokuk IA-Washington IA-
500 PM CDT SAT MAY 27 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR CENTRAL
KEOKUK AND WEST CENTRAL WASHINGTON COUNTIES...
At 500 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Sigourney, moving east at 20 mph.
HAZARD...Tornado and golf ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
Harper around 510 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Yenruogis County Park, Keota, Sigourney Iowa Airport, Sig-Nor Field
Airport, Lancaster, Talleyrand, Keokuk County Expo, Lake Belva Deer
Park and Webster.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4127 9230 4144 9231 4143 9188 4123 9189
TIME...MOT...LOC 2200Z 279DEG 19KT 4133 9214
TORNADO...RADAR INDICATED
HAIL...1.75IN
$$
ERVIN923
WWUS53 KDVN 272202
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
502 PM CDT SAT MAY 27 2017
IAC107-183-272230-
/O.CON.KDVN.TO.W.0039.000000T0000Z-170527T2230Z/
Keokuk IA-Washington IA-
502 PM CDT SAT MAY 27 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR EAST
CENTRAL KEOKUK AND WEST CENTRAL WASHINGTON COUNTIES...
At 501 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Sigourney, moving east at 20 mph.
HAZARD...Tornado and golf ball size 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...
Harper around 510 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Yenruogis County Park, Keota, Sigourney Iowa Airport, Sig-Nor Field
Airport, Lancaster, Talleyrand, Keokuk County Expo and Lake Belva
Deer Park.
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 4127 9227 4143 9225 4143 9188 4123 9189
TIME...MOT...LOC 2201Z 279DEG 19KT 4132 9213
TORNADO...RADAR INDICATED
HAIL...1.75IN
$$
ERVIN663
WWUS53 KDVN 272204
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
504 PM CDT SAT MAY 27 2017
IAC107-183-272230-
/O.CON.KDVN.TO.W.0039.000000T0000Z-170527T2230Z/
Keokuk IA-Washington IA-
504 PM CDT SAT MAY 27 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR EAST
CENTRAL KEOKUK AND WEST CENTRAL WASHINGTON COUNTIES...
At 504 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Harper, or near Sigourney, moving east at 20 mph.
HAZARD...Tornado and golf ball size hail.
SOURCE...Weather spotters reported a funnel cloud.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
Harper around 515 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Yenruogis County Park, Keota, Sigourney Iowa Airport, Sig-Nor Field
Airport, Lancaster, Talleyrand, Keokuk County Expo and Lake Belva
Deer Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4127 9227 4143 9225 4143 9188 4123 9189
TIME...MOT...LOC 2204Z 263DEG 17KT 4133 9212
TORNADO...RADAR INDICATED
HAIL...1.75IN
$$
ERVIN683
WWUS53 KDVN 272209
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
509 PM CDT SAT MAY 27 2017
IAC107-183-272230-
/O.CON.KDVN.TO.W.0039.000000T0000Z-170527T2230Z/
Keokuk IA-Washington IA-
509 PM CDT SAT MAY 27 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR EAST
CENTRAL KEOKUK AND WEST CENTRAL WASHINGTON COUNTIES...
At 509 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Harper, or near Sigourney, moving east at 15 mph.
HAZARD...Tornado and golf ball size hail.
SOURCE...Weather spotters reported a funnel cloud.
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...
Harper around 515 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Yenruogis County Park, Keota, Sigourney Iowa Airport, Sig-Nor Field
Airport, Lancaster, Talleyrand, Keokuk County Expo and Lake Belva
Deer Park.
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 4127 9227 4143 9225 4143 9188 4123 9189
TIME...MOT...LOC 2209Z 274DEG 13KT 4133 9209
TORNADO...RADAR INDICATED
HAIL...1.75IN
$$
ERVIN783
WWUS53 KDVN 272213
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
513 PM CDT SAT MAY 27 2017
IAC107-183-272230-
/O.CON.KDVN.TO.W.0039.000000T0000Z-170527T2230Z/
Keokuk IA-Washington IA-
513 PM CDT SAT MAY 27 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR EAST
CENTRAL KEOKUK AND WEST CENTRAL WASHINGTON COUNTIES...
At 513 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Harper, or near Sigourney, moving east at 15 mph.
HAZARD...Tornado and golf ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This tornadic thunderstorm will remain over mainly rural areas of
east central Keokuk and west central Washington Counties, including
the following locations: Lancaster, Talleyrand, Keota and Lake Belva
Deer Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4127 9218 4142 9217 4143 9188 4123 9189
TIME...MOT...LOC 2213Z 274DEG 13KT 4133 9207
TORNADO...RADAR INDICATED
HAIL...1.75IN
$$
ERVIN025
WWUS53 KDVN 272219
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
519 PM CDT SAT MAY 27 2017
IAC107-183-272230-
/O.CON.KDVN.TO.W.0039.000000T0000Z-170527T2230Z/
Keokuk IA-Washington IA-
519 PM CDT SAT MAY 27 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR EAST
CENTRAL KEOKUK AND WEST CENTRAL WASHINGTON COUNTIES...
At 519 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Harper, or 7 miles east of Sigourney, moving east at
15 mph.
HAZARD...Tornado and golf ball size 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
east central Keokuk and west central Washington Counties, including
the following locations: Lancaster, Talleyrand, Keota and Lake Belva
Deer Park.
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 4127 9218 4142 9217 4143 9188 4123 9189
TIME...MOT...LOC 2219Z 276DEG 13KT 4133 9206
TORNADO...RADAR INDICATED
HAIL...1.75IN
$$
ERVIN622
WWUS53 KDVN 272228
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
528 PM CDT SAT MAY 27 2017
IAC107-183-272238-
/O.EXP.KDVN.TO.W.0039.000000T0000Z-170527T2230Z/
Keokuk IA-Washington IA-
528 PM CDT SAT MAY 27 2017
...THE TORNADO WARNING FOR EAST CENTRAL KEOKUK AND WEST CENTRAL
WASHINGTON COUNTIES WILL EXPIRE AT 530 PM CDT...
The tornadic thunderstorm which prompted the warning has weakened.
Therefore, the warning will be allowed to expire. However heavy
rain is still possible with this thunderstorm.
LAT...LON 4127 9218 4142 9217 4143 9188 4123 9189
TIME...MOT...LOC 2228Z 271DEG 25KT 4133 9199
$$
ERVINThe office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 1:53 AM CDT | Dense Fog Advisory | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more | 8 hr |
| May 27, 4:13 PM CDT | Special Weather Statement | DVN | Buchanan | 32 min |
| May 27, 4:21 PM CDT | Special Weather Statement | DVN | Keokuk | 24 min |
| May 27, 4:27 PM CDT | Severe Thunderstorm Warning | DVN | Keokuk | 63 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.