Alert archive / Iowa / Tornado Warnings in 2016

Tornado Warning 29, NWS Quad Cities, IA

August 28, 2016Buchanan County, Delaware County, Linn County, Iowa

NWS Quad Cities, IA issued this tornado warning at Aug 28, 2016, 4:33 PM CDT for Buchanan County, Delaware County, Linn County, Iowa. It was in force for 27 min. 1 report 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: Aug 28, 2016, 4:33 PM CDT (21:33 UTC)
Expired: Aug 28, 2016, 5:00 PM CDT
In force: 27 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Observed
Hail: 0.0 in

Counties Buchanan County, IA, Delaware County, IA, Linn County, IA

The radar

The Quad Cities radar (KDVN), 115 km from the middle of the area, began a volume at 21:34 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
Aug 28, 4:33 PM CDT	TORNADO	Troy Mills, IA	TORNADO TOUCHDOWN CONFIRMED BY SPOTTERS. FUNNEL CLOUD REPORTED PRIOR TO TOUCHDOWN. NO DAMAGE REPORTED.

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, 9.6 hours before the alert went out and 119 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: 1238 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 797 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

855 
WFUS53 KDVN 282133
TORDVN
IAC019-055-113-282200-
/O.NEW.KDVN.TO.W.0029.160828T2133Z-160828T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA/IL
433 PM CDT SUN AUG 28 2016

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN BUCHANAN COUNTY IN NORTHEASTERN IOWA...
  NORTH CENTRAL LINN COUNTY IN EAST CENTRAL IOWA...
  SOUTHWESTERN DELAWARE COUNTY IN NORTHEASTERN IOWA...

* UNTIL 500 PM CDT

* AT 433 PM CDT...A CONFIRMED TORNADO WAS LOCATED OVER TROY
  MILLS...OR 16 MILES SOUTHEAST OF INDEPENDENCE...MOVING NORTHEAST
  AT 10 MPH.

  HAZARD...DAMAGING TORNADO. 

  SOURCE...WEATHER SPOTTERS CONFIRMED TORNADO. 

  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. 

* THE TORNADO WILL BE NEAR...
  PARIS AROUND 440 PM CDT. 
  COGGON AND RYAN AROUND 500 PM CDT. 

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
ROBINSON...MONTI AND BUFFALO CREEK PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A TORNADO IS ON THE GROUND. 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 4216 9167 4230 9183 4248 9164 4228 9140
TIME...MOT...LOC 2133Z 229DEG 10KT 4228 9168 

TORNADO...OBSERVED
HAIL...0.00IN

$$

ERVIN

2 follow-up statements

275 
WWUS53 KDVN 282146
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA/IL
446 PM CDT SUN AUG 28 2016

IAC019-055-113-282200-
/O.CON.KDVN.TO.W.0029.000000T0000Z-160828T2200Z/
BUCHANAN IA-LINN IA-DELAWARE IA-
446 PM CDT SUN AUG 28 2016

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM CDT FOR
SOUTHEASTERN BUCHANAN...NORTH CENTRAL LINN AND SOUTHWESTERN DELAWARE
COUNTIES...
    
AT 433 PM CDT...A CONFIRMED TORNADO WAS LOCATED NEAR TROY MILLS...OR
15 MILES SOUTHWEST OF MANCHESTER...MOVING NORTHEAST AT 10 MPH. THIS
TORNADO IS STILL A THREAT...BUT MAY HAVE LIFTED AT THIS TIME.

HAZARD...DAMAGING TORNADO. 

SOURCE...WEATHER SPOTTERS CONFIRMED TORNADO. 

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 TORNADO WILL BE NEAR...
  COGGON AROUND 500 PM CDT. 

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
ROBINSON AND BUFFALO CREEK PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A TORNADO IS ON THE GROUND. 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 4221 9173 4228 9179 4239 9159 4228 9140
      4218 9169
TIME...MOT...LOC 2145Z 234DEG 11KT 4229 9162 

TORNADO...OBSERVED
HAIL...<.75IN

$$

ERVIN

903 
WWUS53 KDVN 282154
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA/IL
454 PM CDT SUN AUG 28 2016

IAC019-055-113-282202-
/O.EXP.KDVN.TO.W.0029.000000T0000Z-160828T2200Z/
BUCHANAN IA-LINN IA-DELAWARE IA-
454 PM CDT SUN AUG 28 2016

...THE TORNADO WARNING FOR SOUTHEASTERN BUCHANAN...NORTH CENTRAL LINN
AND SOUTHWESTERN DELAWARE COUNTIES WILL EXPIRE AT 500 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.

IF YOU HAVE SEEN DAMAGE OR HAVE REPORTS OF THIS TORNADO...PLEASE
RELAY THIS TO LOCAL LAW ENFORCEMENT OR EMERGENCY MANAGEMENT.

LAT...LON 4221 9173 4228 9179 4239 9159 4228 9140
      4218 9169
TIME...MOT...LOC 2150Z 229DEG 10KT 4229 9162 

$$

ERVIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 10:45 AM CDT	River Flood Watch	DVN	Des Moines, Louisa	7 days
Aug 28, 10:45 AM CDT	River Flood Watch	DVN	Des Moines	8 days
Aug 28, 10:45 AM CDT	River Flood Watch	DVN	Des Moines, Lee	7 days
Aug 28, 10:45 AM CDT	River Flood Watch	DVN	Cedar, Louisa, Muscatine	6 days
Aug 28, 1:31 PM CDT	Special Weather Statement	DVN	Johnson	59 min
Aug 28, 5:55 PM CDT	Special Weather Statement	DVN	Clinton	35 min
Aug 28, 6:14 PM CDT	Special Weather Statement	DVN	Clinton	31 min
Aug 28, 6:32 PM CDT	Special Weather Statement	DVN	Clinton	28 min

Nearby

Tornado Warnings in Iowa, 2016 Every tornado warning in 2016 Tornadoes in 2016

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.