Alert archive / Iowa / Tornado Warnings in 2016

Tornado Warning 16, NWS Des Moines, IA

November 28, 2016Mahaska County, Poweshiek County, Iowa

NWS Des Moines, IA issued this tornado warning at Nov 28, 2016, 3:53 PM CST for Mahaska County, Poweshiek County, Iowa. It was in force for 37 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: Nov 28, 2016, 3:53 PM CST (21:53 UTC)
Expired: Nov 28, 2016, 4:30 PM CST
In force: 37 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Mahaska County, IA, Poweshiek County, IA

The radar

The Des Moines radar (KDMX), 94 km from the middle of the area, began a volume at 21:54 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
Nov 28, 4:19 PM CST	TORNADO	5 Ssw Montezuma, IA	PICTURE OF CONFIRMED TORNADO TAKEN AT US 63 AND PARKIN AVE IN MAHASKA COUNTY LOOKING NORTH SENT IN FROM SPOTTER. TIME RADAR ESTIMATED. DELAYED REPORT. .

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, 9.9 hours before the alert went out and 180 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 666 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 310 m²/s²
0-3 km storm-relative helicity: 333 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

882 
WFUS53 KDMX 282153
TORDMX
IAC123-157-282230-
/O.NEW.KDMX.TO.W.0016.161128T2153Z-161128T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
353 PM CST MON NOV 28 2016

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTH CENTRAL POWESHIEK COUNTY IN CENTRAL IOWA...
  NORTHERN MAHASKA COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 430 PM CST.

* AT 353 PM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR NEW SHARON...OR 10 MILES NORTH OF
  OSKALOOSA...MOVING NORTHEAST AT 25 MPH.

  HAZARD...TORNADO. 

  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...
  NEW SHARON AROUND 400 PM CST. 
  MONTEZUMA AROUND 420 PM CST. 

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 4140 9274 4145 9278 4161 9256 4144 9244
TIME...MOT...LOC 2153Z 240DEG 23KT 4144 9270 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

BEERENDS

3 follow-up statements

114 
WWUS53 KDMX 282203
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
403 PM CST MON NOV 28 2016

IAC123-157-282230-
/O.CON.KDMX.TO.W.0016.000000T0000Z-161128T2230Z/
POWESHIEK IA-MAHASKA IA-
403 PM CST MON NOV 28 2016

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM CST FOR SOUTH
CENTRAL POWESHIEK AND NORTH CENTRAL MAHASKA COUNTIES...
    
AT 403 PM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED OVER NEW SHARON...OR 9 MILES SOUTHWEST OF MONTEZUMA...
MOVING NORTHEAST AT 25 MPH.

HAZARD...TORNADO. 

SOURCE...RADAR INDICATED ROTATION. 

IMPACT...EXPECT DAMAGE TO MOBILE HOMES...ROOFS...AND VEHICLES. 

THIS DANGEROUS STORM WILL BE NEAR...
  MONTEZUMA AROUND 425 PM CST. 

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 4144 9269 4147 9273 4161 9256 4147 9246
TIME...MOT...LOC 2203Z 235DEG 21KT 4147 9265 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

BEERENDS

452 
WWUS53 KDMX 282217
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
417 PM CST MON NOV 28 2016

IAC123-157-282230-
/O.CON.KDMX.TO.W.0016.000000T0000Z-161128T2230Z/
POWESHIEK IA-MAHASKA IA-
417 PM CST MON NOV 28 2016

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM CST FOR SOUTH
CENTRAL POWESHIEK AND NORTH CENTRAL MAHASKA COUNTIES...
        
AT 416 PM CST...A CONFIRMED TORNADO WAS LOCATED NEAR NEW SHARON...OR
NEAR MONTEZUMA...MOVING NORTHEAST AT 25 MPH.

HAZARD...TORNADO. 

SOURCE...RADAR CONFIRMED TORNADO. 

IMPACT...EXPECT DAMAGE TO MOBILE HOMES...ROOFS...AND VEHICLES. 

THIS TORNADO WILL BE NEAR...
  MONTEZUMA AROUND 430 PM CST. 

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 4145 9265 4149 9269 4161 9256 4151 9249
TIME...MOT...LOC 2216Z 233DEG 21KT 4152 9258 

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

$$

BEERENDS

822 
WWUS53 KDMX 282222
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
422 PM CST MON NOV 28 2016

IAC123-282231-
/O.CAN.KDMX.TO.W.0016.000000T0000Z-161128T2230Z/
MAHASKA IA-
422 PM CST MON NOV 28 2016

...THE TORNADO WARNING FOR NORTH CENTRAL MAHASKA COUNTY IS
CANCELLED...
    
THE TORNADIC THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT 
OF THE WARNED AREA. THEREFORE...THE WARNING HAS BEEN CANCELLED.

LAT...LON 4151 9262 4153 9265 4161 9256 4151 9249
TIME...MOT...LOC 2221Z 231DEG 18KT 4154 9256 

$$

IAC157-282230-
/O.CON.KDMX.TO.W.0016.000000T0000Z-161128T2230Z/
POWESHIEK IA-
422 PM CST MON NOV 28 2016

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM CST FOR SOUTH
CENTRAL POWESHIEK COUNTY...
        
AT 421 PM CST...A CONFIRMED TORNADO WAS LOCATED NEAR MONTEZUMA...
MOVING NORTHEAST AT 20 MPH.

HAZARD...TORNADO. 

SOURCE...RADAR CONFIRMED TORNADO. 

IMPACT...EXPECT DAMAGE TO MOBILE HOMES...ROOFS...AND VEHICLES. 

THIS TORNADO WILL BE NEAR...
  MONTEZUMA AROUND 430 PM CST. 

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 4151 9262 4153 9265 4161 9256 4151 9249
TIME...MOT...LOC 2221Z 231DEG 18KT 4154 9256 

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

$$

BEERENDS

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 28, 3:13 PM CST	Special Weather Statement	DMX	Grundy	62 min
Nov 28, 3:16 PM CST	Special Weather Statement	DMX	Mahaska	59 min
Nov 28, 3:33 PM CST	Tornado Warning	DMX	Butler, Grundy	27 min
Nov 28, 3:43 PM CST	Tornado Warning	DMX	Grundy	32 min
Nov 28, 3:54 PM CST	Tornado Warning	DMX	Marshall, Tama	18 min
Nov 28, 3:59 PM CST	Tornado Warning	DMX	Bremer, Butler	46 min
Nov 28, 4:19 PM CST	Tornado Warning Tornado observed	DMX	Poweshiek	41 min
Nov 28, 4:41 PM CST	Tornado Warning	DMX	Davis	13 min
Nov 28, 5:11 PM CST	Special Weather Statement	DMX	Wapello	34 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.