Alert archive / Iowa / Tornado Warnings in 2015

Tornado Warning 4, NWS Quad Cities, IA

April 9, 2015Keokuk County, Washington County, Iowa

NWS Quad Cities, IA issued this tornado warning at Apr 9, 2015, 3:39 PM CDT for Keokuk County, Washington County, Iowa. It was in force for 36 min. 2 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: Apr 9, 2015, 3:39 PM CDT (20:39 UTC)
Expired: Apr 9, 2015, 4:15 PM CDT
In force: 36 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), 110 km from the middle of the area, began a volume at 20:39 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
Apr 9, 3:40 PM CDT	HAIL 1	1 N Richland, IA	POWER LINES DOWN. DELAYED REPORT.
Apr 9, 4:13 PM CDT	HAIL 1	1 N Washington, IA	HAIL FOR LAST 2 MINUTES

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
Apr 9, 12:58 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.7 hours before the alert went out and 117 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: 101 J/kg
Mixed-layer CIN: -154 J/kg
Mixed-layer LCL: 614 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 323 m²/s²
0-3 km storm-relative helicity: 253 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

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

916 
WFUS53 KDVN 092039
TORDVN
IAC107-183-092115-
/O.NEW.KDVN.TO.W.0004.150409T2039Z-150409T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
339 PM CDT THU APR 9 2015

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN KEOKUK COUNTY IN SOUTHEAST IOWA...
  CENTRAL WASHINGTON COUNTY IN SOUTHEAST IOWA...

* UNTIL 415 PM CDT

* AT 336 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 6 MILES SOUTHWEST OF HARPER...AND MOVING
  NORTHEAST AT 45 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...
  RICHMOND AND KALONA AROUND 410 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE TALLEYRAND...KEOTA AND WEST
CHESTER.

OTHER LOCATIONS AFFECTED INCLUDE WASHINGTON COUNTY FAIRGROUNDS...
KEOKUK COUNTY EXPO...BRINTON TIMBER PARK AND MARR PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

HEAVY RAINFALL MAY HIDE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. TAKE COVER NOW.

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN THE
QUAD CITIES.

&&

LAT...LON 4149 9170 4127 9153 4117 9212 4134 9223
TIME...MOT...LOC 2039Z 245DEG 38KT 4130 9206

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

MCCLURE

2 follow-up statements

607 
WWUS53 KDVN 092046
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
346 PM CDT THU APR 9 2015

IAC107-183-092115-
/O.CON.KDVN.TO.W.0004.000000T0000Z-150409T2115Z/
WASHINGTON IA-KEOKUK IA-
346 PM CDT THU APR 9 2015

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN KEOKUK AND
CENTRAL WASHINGTON COUNTIES UNTIL 415 PM CDT...

AT 344 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR HARPER...AND MOVING NORTHEAST AT 45 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...
  RICHMOND AND KALONA AROUND 410 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE WEST CHESTER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

HEAVY RAINFALL MAY HIDE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. TAKE COVER NOW.

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN THE
QUAD CITIES.

&&

LAT...LON 4136 9216 4149 9170 4127 9153 4118 9209
TIME...MOT...LOC 2046Z 245DEG 38KT 4133 9198

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

MCCLURE

264 
WWUS53 KDVN 092058
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
358 PM CDT THU APR 9 2015

IAC107-092108-
/O.CAN.KDVN.TO.W.0004.000000T0000Z-150409T2115Z/
KEOKUK IA-
358 PM CDT THU APR 9 2015

...THE TORNADO WARNING FOR SOUTHEASTERN KEOKUK COUNTY IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4142 9195 4149 9170 4127 9153 4120 9194
TIME...MOT...LOC 2058Z 245DEG 38KT 4138 9183

$$

IAC183-092115-
/O.CON.KDVN.TO.W.0004.000000T0000Z-150409T2115Z/
WASHINGTON IA-
358 PM CDT THU APR 9 2015

...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL WASHINGTON COUNTY
UNTIL 415 PM CDT...

AT 355 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED 7 MILES SOUTH OF WELLMAN...AND MOVING NORTHEAST AT 45
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...
  RICHMOND AND KALONA AROUND 410 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN THE
QUAD CITIES.

&&

LAT...LON 4142 9195 4149 9170 4127 9153 4120 9194
TIME...MOT...LOC 2058Z 245DEG 38KT 4138 9183

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

MCCLURE

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 8, 8:46 PM CDT	Special Weather Statement	DVN	Lee	44 min
Apr 9, 12:00 AM CDT	Special Weather Statement	DVN	Buchanan	30 min
Apr 9, 3:11 PM CDT	Special Weather Statement	DVN	Keokuk	34 min
Apr 9, 3:19 PM CDT	Severe Thunderstorm Warning	DVN	Keokuk	26 min
Apr 9, 3:57 PM CDT	Special Weather Statement	DVN	Van Buren	48 min
Apr 9, 4:06 PM CDT	Special Weather Statement	DVN	Dubuque	9 min
Apr 9, 4:14 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Johnson, Louisa, Muscatine, Washington	46 min
Apr 9, 4:19 PM CDT	Special Weather Statement	DVN	Linn	41 min
Apr 9, 4:27 PM CDT	Special Weather Statement	DVN	Henry, Lee	48 min
Apr 9, 4:32 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Lee	43 min
Apr 9, 4:35 PM CDT	Flash Flood Warning	DVN	Linn	6 hr
Apr 9, 5:00 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Muscatine, Scott	45 min
Apr 9, 5:06 PM CDT	Tornado Warning	DVN	Scott	24 min
Apr 9, 5:24 PM CDT	Tornado Warning	DVN	Clinton, Scott	36 min
Apr 9, 5:41 PM CDT	Special Weather Statement	DVN	Dubuque	64 min
Apr 9, 5:45 PM CDT	Severe Thunderstorm Warning	DVN	Dubuque	30 min
Apr 9, 5:49 PM CDT	Tornado Warning Tornado observedConsiderable damage threat	DVN	Clinton	26 min
Apr 9, 6:39 PM CDT	Special Weather Statement	DVN	Des Moines, Henry, Iowa, Jefferson, Johnson, Keokuk and 6 more	2 hr

Nearby

Tornado Warnings in Iowa, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.