Alert archive / Iowa / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 2, NWS Quad Cities, IA

February 28, 20174 counties in Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Feb 28, 2017, 3:26 PM CST for 4 counties in Iowa. It was in force for 36 min. 6 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: Feb 28, 2017, 3:26 PM CST (21:26 UTC)
Expired: Feb 28, 2017, 4:02 PM CST
In force: 36 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Iowa County, IA, Johnson County, IA, Keokuk County, IA, Washington County, IA

The radar

The Quad Cities radar (KDVN), 105 km from the middle of the area, began a volume at 21:26 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
Feb 28, 3:40 PM CST	HAIL 0.5	1 Nw Williamstown, IA	HALF INCH HAIL 330 TO 340 PM. HAIL IS COVERING THE GROUND.
Feb 28, 3:48 PM CST	HAIL 0.25	5 S Iowa City, IA
Feb 28, 3:55 PM CST	HAIL 0.75	1 Wsw Iowa City, IA	ESTIMATED PENNY SIZED HAIL ON THE WEST SIDE OF IOWA CITY.
Feb 28, 3:55 PM CST	HAIL 1.25	Se Iowa City, IA
Feb 28, 3:57 PM CST	HAIL 0.88	Se Iowa City, IA	ESTIMATED DIME TO NICKEL SIZED HAIL ON THE SOUTHEAST SIDE OF IOWA CITY RIGHT NOW. HAIL IS COVERING THE GROUND.
Feb 28, 4:00 PM CST	HAIL 1	Se Iowa City, IA	QUARTER SIZE HAIL ON SOUTHEAST SIDE OF IOWA CITY.

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
Feb 28, 2:57 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.4 hours before the alert went out and 112 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: 30 J/kg
Mixed-layer CIN: -241 J/kg
Mixed-layer LCL: 771 m above ground
0-6 km bulk shear: 80 kt
0-1 km storm-relative helicity: 223 m²/s²
0-3 km storm-relative helicity: 294 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

562 
WUUS53 KDVN 282126
SVRDVN
IAC095-103-107-183-282215-
/O.NEW.KDVN.SV.W.0002.170228T2126Z-170228T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
326 PM CST TUE FEB 28 2017

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Northeastern Keokuk County in southeastern Iowa...
  Southwestern Johnson County in east central Iowa...
  Northern Washington County in southeastern Iowa...
  Southeastern Iowa County in east central Iowa...

* Until 415 PM CST

* At 326 PM CST, a severe thunderstorm was located near Kinross, or
  17 miles northeast of Sigourney, moving east at 30 mph.

  HAZARD...60 mph wind gusts and half dollar size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Iowa City, Coralville, North Liberty, Kalona, Tiffin, Wellman,
  University Heights, Riverside, Hills, Parnell, Kinross, Oakdale,
  Richmond, Iowa City Municipal Airport, Frytown, Windham, Johnson
  County Fairgrounds, Hills Access, Cosgrove and Amish.

This includes the following highways...
 Interstate 80 in Iowa between mile markers 235 and 244.
 Interstate 380 near mile marker 1.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
sturdy building.

&&

A tornado watch remains in effect until 1000 PM CST for southeastern
and east central Iowa.

LAT...LON 4161 9207 4174 9155 4145 9149 4144 9206
TIME...MOT...LOC 2126Z 259DEG 28KT 4152 9197 

HAIL...1.25IN
WIND...60MPH
 
$$

RP KINNEY

3 follow-up statements

133 
WWUS53 KDVN 282133
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
333 PM CST TUE FEB 28 2017

IAC107-282142-
/O.CAN.KDVN.SV.W.0002.000000T0000Z-170228T2215Z/
Keokuk IA-
333 PM CST TUE FEB 28 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN KEOKUK COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area therefore the warning has been cancelled.

A tornado watch remains in effect until 1000 PM CST for southeastern
and east central Iowa.

LAT...LON 4162 9197 4174 9155 4145 9149 4144 9193
TIME...MOT...LOC 2132Z 258DEG 33KT 4153 9187 

$$

IAC095-103-183-282215-
/O.CON.KDVN.SV.W.0002.000000T0000Z-170228T2215Z/
Johnson IA-Washington IA-Iowa IA-
333 PM CST TUE FEB 28 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CST
FOR SOUTHWESTERN JOHNSON...NORTHERN WASHINGTON AND SOUTHEASTERN IOWA
COUNTIES...

At 332 PM CST, a severe thunderstorm was located near Wellman, or 18
miles northwest of Washington, moving east at 40 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees. 

Locations impacted include...
Iowa City, Coralville, North Liberty, Kalona, Tiffin, Wellman,
University Heights, Riverside, Hills, Oakdale, Richmond, Iowa City
Municipal Airport, Frytown, Windham, Johnson County Fairgrounds,
Hills Access, Cosgrove, Amish, Holbrook and University Of Iowa.

This includes the following highways...
 Interstate 80 in Iowa between mile markers 236 and 244.
 Interstate 380 near mile marker 1.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted act quickly and move to a place
of safety inside a sturdy structure, such as a basement or small
interior room.

For your protection move to an interior room on the lowest floor of a
sturdy building.

&&

A tornado watch remains in effect until 1000 PM CST for southeastern
and east central Iowa.

LAT...LON 4162 9197 4174 9155 4145 9149 4144 9193
TIME...MOT...LOC 2132Z 258DEG 33KT 4153 9187 

HAIL...1.50IN
WIND...60MPH
 
$$

RP KINNEY

053 
WWUS53 KDVN 282143
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
343 PM CST TUE FEB 28 2017

IAC095-183-282152-
/O.CAN.KDVN.SV.W.0002.000000T0000Z-170228T2215Z/
Washington IA-Iowa IA-
343 PM CST TUE FEB 28 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN WASHINGTON AND
SOUTHEASTERN IOWA COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area therefore the warning has been cancelled.

A tornado watch remains in effect until 1000 PM CST for southeastern
and east central Iowa.

LAT...LON 4174 9155 4149 9150 4149 9151 4150 9151
      4150 9152 4151 9153 4151 9181 4158 9183
      4162 9183
TIME...MOT...LOC 2142Z 259DEG 28KT 4155 9176 

$$

IAC103-282215-
/O.CON.KDVN.SV.W.0002.000000T0000Z-170228T2215Z/
Johnson IA-
343 PM CST TUE FEB 28 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CST
FOR SOUTHWESTERN JOHNSON COUNTY...

At 342 PM CST, a severe thunderstorm was located near Kalona, or 13
miles southwest of Iowa City, moving east at 30 mph.

HAZARD...60 mph wind gusts and half dollar size hail. 

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. 

Locations impacted include...
Iowa City, Coralville, Tiffin, University Heights, Hills, Oakdale,
Iowa City Municipal Airport, Frytown, Windham, Johnson County
Fairgrounds, Hills Access, Cosgrove, Amish, University Of Iowa and
Sharon Center.

This includes Interstate 80 in Iowa between mile markers 239 and 244.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

&&

A tornado watch remains in effect until 1000 PM CST for southeastern
and east central Iowa.

LAT...LON 4174 9155 4149 9150 4149 9151 4150 9151
      4150 9152 4151 9153 4151 9181 4158 9183
      4162 9183
TIME...MOT...LOC 2142Z 259DEG 28KT 4155 9176 

TORNADO...POSSIBLE
HAIL...1.25IN
WIND...60MPH
 
$$

RP KINNEY

935 
WWUS53 KDVN 282202
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
402 PM CST TUE FEB 28 2017

IAC103-282212-
/O.CAN.KDVN.SV.W.0002.000000T0000Z-170228T2215Z/
Johnson IA-
402 PM CST TUE FEB 28 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN JOHNSON COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning has been cancelled.

A tornado watch remains in effect until 1000 PM CST for southeastern
and east central Iowa.

LAT...LON 4174 9155 4149 9150 4149 9151 4150 9151
      4150 9152 4151 9153 4151 9181 4158 9183
      4162 9183
TIME...MOT...LOC 2200Z 259DEG 28KT 4158 9155 

$$

RP KINNEY

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 28, 2:54 AM CST	Special Weather Statement	DVN	Louisa	51 min
Feb 28, 10:16 AM CST	River Flood Warning	DVN	Clinton, Scott	6 days
Feb 28, 10:39 AM CST	River Flood Warning	DVN	Muscatine, Scott	6 days
Feb 28, 10:39 AM CST	River Flood Warning	DVN	Louisa, Muscatine	7 days
Feb 28, 10:39 AM CST	River Flood Warning	DVN	Louisa	9 days
Feb 28, 10:39 AM CST	River Flood Warning	DVN	Des Moines, Louisa	10 days
Feb 28, 10:52 AM CST	River Flood Watch	DVN	Clinton	8 days
Feb 28, 10:52 AM CST	River Flood Watch	DVN	Muscatine	4 days
Feb 28, 3:04 PM CST	Severe Thunderstorm Warning	DVN	Lee	41 min
Feb 28, 3:28 PM CST	Tornado Warning	DVN	Clinton, Scott	47 min
Feb 28, 3:44 PM CST	Severe Thunderstorm Warning	DVN	Lee	46 min
Feb 28, 3:51 PM CST	Severe Thunderstorm Warning	DVN	Cedar, Johnson, Muscatine	39 min
Feb 28, 4:01 PM CST	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Scott	59 min
Feb 28, 4:02 PM CST	Tornado Warning Tornado observed	DVN	Clinton	22 min
Feb 28, 4:23 PM CST	Severe Thunderstorm Warning	DVN	Clinton	67 min
Feb 28, 5:19 PM CST	Severe Thunderstorm Warning	DVN	Iowa, Keokuk, Washington	26 min
Feb 28, 5:28 PM CST	Severe Thunderstorm Warning	DVN	Cedar, Johnson	29 min
Feb 28, 5:44 PM CST	Severe Thunderstorm Warning	DVN	Johnson	31 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2017 Every severe thunderstorm warning 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.