Alert archive / Iowa / Tornado Warnings in 2015

Tornado Warning 6, NWS Des Moines, IA

May 17, 2015Dallas County, Iowa

NWS Des Moines, IA issued this tornado warning at May 17, 2015, 3:13 AM CDT for Dallas County, Iowa. It was in force for 32 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: May 17, 2015, 3:13 AM CDT (08:13 UTC)
Expired: May 17, 2015, 3:45 AM CDT
In force: 32 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Dallas County, IA

What was reported inside it

Time	Report	Where	Remark
May 17, 3:13 AM CDT	NON-TSTM WND DMG	Dallas Center, IA	TREES DOWN IN DALLAS CENTER 10 TO 12 INCH DIAMETER BETWEEN ASH AND WALNUT STREETS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 8.2 hours before the alert went out and 203 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: 1511 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

492 
WFUS53 KDMX 170813
TORDMX
IAC049-170845-
/O.NEW.KDMX.TO.W.0006.150517T0813Z-150517T0845Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
313 AM CDT SUN MAY 17 2015

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* TORNADO WARNING FOR...
  NORTH CENTRAL DALLAS COUNTY IN CENTRAL IOWA...

* UNTIL 345 AM CDT
    
* AT 313 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED OVER DALLAS CENTER...OR 4 MILES NORTH OF
  ADEL...MOVING NORTH 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...
  PERRY AND WOODWARD AROUND 345 AM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
MINBURN AND BOUTON.

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 4167 9397 4167 9402 4185 9409 4185 9391
TIME...MOT...LOC 0813Z 184DEG 22KT 4167 9398 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

BOKSA

2 follow-up statements

625 
WWUS53 KDMX 170825
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
325 AM CDT SUN MAY 17 2015

IAC049-170845-
/O.CON.KDMX.TO.W.0006.000000T0000Z-150517T0845Z/
DALLAS IA-
325 AM CDT SUN MAY 17 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 345 AM CDT FOR NORTH
CENTRAL DALLAS COUNTY...
    
AT 324 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR DALLAS CENTER...OR 9 MILES NORTH OF ADEL...MOVING
NORTH 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...
  PERRY AND WOODWARD AROUND 345 AM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
MINBURN AND BOUTON.

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 4173 9395 4173 9404 4185 9409 4185 9391
TIME...MOT...LOC 0824Z 184DEG 22KT 4174 9397 

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

$$

BOKSA

678 
WWUS53 KDMX 170844
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
344 AM CDT SUN MAY 17 2015

IAC049-170854-
/O.EXP.KDMX.TO.W.0006.000000T0000Z-150517T0845Z/
DALLAS IA-
344 AM CDT SUN MAY 17 2015

...THE TORNADO WARNING FOR NORTH CENTRAL DALLAS COUNTY WILL EXPIRE AT
345 AM CDT...
        
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 4173 9395 4173 9404 4185 9409 4185 9391
TIME...MOT...LOC 0840Z 184DEG 22KT 4174 9397 

$$

BOKSA

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 3:11 AM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Greene	49 min
May 17, 3:26 AM CDT	Special Weather Statement	DMX	Jasper, Mahaska, Marshall, Poweshiek, Story, Tama	49 min
May 17, 3:30 AM CDT	Tornado Warning	DMX	Boone, Dallas	30 min
May 17, 4:03 AM CDT	Tornado Warning Tornado observed	DMX	Boone, Webster	21 min

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.