Alert archive / Iowa / Tornado Warnings in 2015

Tornado Warning 7, NWS Des Moines, IA

May 17, 2015Boone County, Dallas County, Iowa

NWS Des Moines, IA issued this tornado warning at May 17, 2015, 3:30 AM CDT for Boone County, Dallas County, Iowa. It was in force for 30 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, 3:30 AM CDT (08:30 UTC)
Expired: May 17, 2015, 4:00 AM CDT
In force: 30 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Boone County, IA, Dallas County, IA

What was reported inside it

Time	Report	Where	Remark
May 17, 3:52 AM CDT	TORNADO	1 W Ogden, IA	REPORT OF TORNADO ON THE GROUND

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, 8.5 hours before the alert went out and 210 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.

890 
WFUS53 KDMX 170830
TORDMX
IAC015-049-170900-
/O.NEW.KDMX.TO.W.0007.150517T0830Z-150517T0900Z/

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

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

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

* UNTIL 400 AM CDT
    
* AT 329 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 4 MILES NORTHWEST OF WOODWARD...OR 5 MILES EAST
  OF PERRY...MOVING NORTH AT 45 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...
  OGDEN AROUND 345 AM CDT.
  BOONE AROUND 350 AM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
BOUTON...FRASER AND PILOT MOUND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES ARE EXTREMELY DIFFICULT TO SEE AND CONFIRM AT NIGHT. 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 OFFICE IN
DES MOINES .

&&

LAT...LON 4181 9395 4182 9405 4215 9413 4216 9387
TIME...MOT...LOC 0829Z 183DEG 38KT 4187 9400 

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

$$

BOKSA

2 follow-up statements

000 
WWUS53 KDMX 170841
SVSDMX

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

IAC049-170849-
/O.CAN.KDMX.TO.W.0007.000000T0000Z-150517T0900Z/
DALLAS IA-
341 AM CDT SUN MAY 17 2015

...THE TORNADO WARNING FOR NORTH CENTRAL DALLAS COUNTY IS
CANCELLED...
    
THE TORNADIC THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT 
OF THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.  THE 
PREVIOUS TORNADO WARNING FOR DALLAS COUNTY HAS ALSO BEEN ALLOWED TO 
EXPIRE. 

LAT...LON 4192 9392 4194 9408 4215 9413 4216 9387
TIME...MOT...LOC 0839Z 183DEG 38KT 4198 9399 

$$

IAC015-170900-
/O.CON.KDMX.TO.W.0007.000000T0000Z-150517T0900Z/
BOONE IA-
341 AM CDT SUN MAY 17 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 400 AM CDT FOR WESTERN
BOONE COUNTY...
    
AT 339 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED 4 MILES SOUTHEAST OF OGDEN...OR 7 MILES SOUTHWEST OF
BOONE...MOVING NORTH AT 45 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...
  BOONE AROUND 350 AM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE FRASER
AND PILOT MOUND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES ARE EXTREMELY DIFFICULT TO SEE AND CONFIRM AT NIGHT. DO NOT
WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW.

IF A TORNADO OR OTHER SEVERE WEATHER IS SPOTTED...REPORT IT TO THE
NATIONAL WEATHER SERVICE OR YOUR LOCAL NEAREST LAW ENFORCEMENT AGENCY
WHO WILL SEND YOUR REPORT. THIS ACT MAY SAVE LIVES OF OTHERS IN THE
PATH OF DANGEROUS WEATHER.

&&

LAT...LON 4192 9392 4194 9408 4215 9413 4216 9387
TIME...MOT...LOC 0839Z 183DEG 38KT 4198 9399 

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

$$

BOKSA

802 
WWUS53 KDMX 170847
SVSDMX

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

IAC015-170900-
/O.CON.KDMX.TO.W.0007.000000T0000Z-150517T0900Z/
BOONE IA-
347 AM CDT SUN MAY 17 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 400 AM CDT FOR
NORTHWESTERN BOONE COUNTY...
    
AT 346 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED OVER OGDEN...OR 8 MILES WEST OF BOONE...MOVING NORTH AT
40 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 TORNADIC THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
NORTHWESTERN BOONE COUNTY...INCLUDING THE FOLLOWING LOCATIONS...
FRASER AND PILOT MOUND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES ARE EXTREMELY DIFFICULT TO SEE AND CONFIRM AT NIGHT. DO NOT
WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW.

IF A TORNADO OR OTHER SEVERE WEATHER IS SPOTTED...REPORT IT TO THE
NATIONAL WEATHER SERVICE OR YOUR LOCAL NEAREST LAW ENFORCEMENT AGENCY
WHO WILL SEND YOUR REPORT. THIS ACT MAY SAVE LIVES OF OTHERS IN THE
PATH OF DANGEROUS WEATHER.

&&

LAT...LON 4195 9399 4195 9406 4215 9413 4216 9396
TIME...MOT...LOC 0846Z 174DEG 35KT 4202 9404 

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

$$

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, 3:13 AM CDT	Tornado Warning	DMX	Dallas	32 min
May 17, 3:26 AM CDT	Special Weather Statement	DMX	Jasper, Mahaska, Marshall, Poweshiek, Story, Tama	49 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.