Alert archive / Iowa / Tornado Warnings in 2015

Tornado Warning 2, NWS Des Moines, IA

May 10, 2015Calhoun County, Carroll County, Iowa

NWS Des Moines, IA issued this tornado warning at May 10, 2015, 7:15 PM CDT for Calhoun County, Carroll County, Iowa. It was in force for 30 min. 5 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: May 10, 2015, 7:15 PM CDT (00:15 UTC)
Expired: May 10, 2015, 7:45 PM CDT
In force: 30 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Observed
Hail: 0.75 in

Counties Calhoun County, IA, Carroll County, IA

The radar

The Des Moines radar (KDMX), 103 km from the middle of the area, began a volume at 00:02 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
May 10, 7:28 PM CDT	TORNADO	2 S Lake City, IA	TRAINED SPOTTER REPORTS TORNADO NEARING LAKE CITY ... OCCASIONALLY LIFTING UP AND DOWN. REPORT SENT IN FROM NEAR LOHRVILLE.
May 10, 7:29 PM CDT	TORNADO	2 S Lake City, IA	MULTIPLE VORTEX TORNADO 1/4 MILE WIDE. SPOTTER STATES IT IS HEADING TOWARDS LAKE CITY.
May 10, 7:41 PM CDT	TORNADO	Lake City, IA	MORE DAMAGE IN LAKE CITY...2-3 FOOT DIAMETER TREES UPROOTED IN TOWN, POWERLINES DOWN AND MULTIPLE ROOFS OFF HOUSES. TORNADO DAMAGE ESTIMATED TO BE 2 BLOCKS WIDE.
May 10, 7:44 PM CDT	TORNADO	Lake City, IA	LARGE TREES UPROOTED, GARAGE OFF FOUNDATION AND ROOFS OFF HOUSES.
May 10, 7:44 PM CDT	TORNADO	Lake City, IA	TRAINED SPOTTER REPORTS HIGH SCHOOL ROOF RIPPED OFF BUILDING, TREES AND POWER LINES DOWN ACROSS TOWN IN LAKE CITY.

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, 0.3 hours before the alert went out and 169 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: 22 J/kg
Mixed-layer CIN: -186 J/kg
Mixed-layer LCL: 1224 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 106 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

339 
WFUS53 KDMX 110015
TORDMX
IAC025-027-110045-
/O.NEW.KDMX.TO.W.0002.150511T0015Z-150511T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
715 PM CDT SUN MAY 10 2015

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* TORNADO WARNING FOR...
  NORTH CENTRAL CARROLL COUNTY IN WEST CENTRAL IOWA...
  SOUTHERN CALHOUN COUNTY IN WEST CENTRAL IOWA...

* UNTIL 745 PM CDT

* AT 714 PM CDT...A CONFIRMED TORNADO WAS LOCATED 7 MILES SOUTHWEST
  OF LAKE CITY...OR 8 MILES NORTH OF CARROLL...MOVING NORTHEAST AT 25
  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...
  LAKE CITY AROUND 735 PM CDT.
  ROCKWELL CITY AROUND 745 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
ROCKWELL CITY MUNICIPAL AIRPORT.

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 4213 9481 4216 9487 4244 9480 4237 9449
TIME...MOT...LOC 0014Z 207DEG 24KT 4218 9482 

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

$$

SKOW

2 follow-up statements

834 
WWUS53 KDMX 110025
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
725 PM CDT SUN MAY 10 2015

IAC025-027-110045-
/O.CON.KDMX.TO.W.0002.000000T0000Z-150511T0045Z/
CARROLL IA-CALHOUN IA-
725 PM CDT SUN MAY 10 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR NORTH
CENTRAL CARROLL AND SOUTHERN CALHOUN COUNTIES...
    
AT 725 PM CDT...A CONFIRMED TORNADO WAS LOCATED NEAR LAKE CITY...OR
12 MILES NORTHEAST OF CARROLL...MOVING NORTHEAST AT 30 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. 

THIS TORNADO WILL BE NEAR...
  LAKE CITY AROUND 735 PM CDT.
  ROCKWELL CITY AROUND 745 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
ROCKWELL CITY MUNICIPAL AIRPORT.

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 4218 9476 4219 9484 4243 9477 4237 9449
TIME...MOT...LOC 0025Z 214DEG 24KT 4223 9477 

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

$$

SKOW

676 
WWUS53 KDMX 110030
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
730 PM CDT SUN MAY 10 2015

IAC027-110039-
/O.CAN.KDMX.TO.W.0002.000000T0000Z-150511T0045Z/
CARROLL IA-
730 PM CDT SUN MAY 10 2015

...THE TORNADO WARNING FOR NORTH CENTRAL CARROLL 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 4222 9475 4223 9480 4242 9474 4238 9454
TIME...MOT...LOC 0029Z 206DEG 24KT 4225 9476 

$$

IAC025-110045-
/O.CON.KDMX.TO.W.0002.000000T0000Z-150511T0045Z/
CALHOUN IA-
730 PM CDT SUN MAY 10 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR SOUTH
CENTRAL CALHOUN COUNTY...
    
AT 729 PM CDT...A CONFIRMED TORNADO WAS LOCATED OVER LAKE CITY...OR
12 MILES SOUTHWEST OF ROCKWELL CITY...MOVING NORTHEAST AT 25 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. 

THIS TORNADO WILL BE NEAR...
  ROCKWELL CITY AROUND 745 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
ROCKWELL CITY MUNICIPAL AIRPORT.

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 4222 9475 4223 9480 4242 9474 4238 9454
TIME...MOT...LOC 0029Z 206DEG 24KT 4225 9476 

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

$$

SKOW

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 7:10 PM CDT	Special Weather Statement	DMX	Cass	50 min
May 10, 7:37 PM CDT	Tornado Warning	DMX	Pocahontas	23 min
May 10, 7:43 PM CDT	Tornado Warning Tornado observed	DMX	Calhoun	32 min
May 10, 8:02 PM CDT	Severe Thunderstorm Warning	DMX	Carroll	28 min
May 10, 8:12 PM CDT	Tornado Warning	DMX	Calhoun, Pocahontas	33 min
May 10, 8:18 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Carroll, Sac	27 min
May 10, 8:41 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Pocahontas	49 min
May 10, 9:32 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Madison	18 min
May 10, 10:09 PM CDT	Special Weather Statement	DMX	Boone	36 min
May 11, 12:13 AM CDT	Special Weather Statement	DMX	Worth	17 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; radar from the NEXRAD Level II archive.