Alert archive / Iowa / Tornado Warnings in 2015

Tornado Warning 22, NWS Des Moines, IA

August 2, 2015Adams County, Union County, Iowa

NWS Des Moines, IA issued this tornado warning at Aug 2, 2015, 6:55 PM CDT for Adams County, Union County, Iowa. It was in force for 18 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 2, 2015, 6:55 PM CDT (23:55 UTC)
Expired: Aug 2, 2015, 7:13 PM CDT
In force: 18 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Observed
Hail: 1.0 in

Counties Adams County, IA, Union County, IA

The radar

The Des Moines radar (KDMX), 99 km from the middle of the area, began a volume at 23:55 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 2, 6:58 PM CDT	TSTM WND DMG	7 Nnw Cromwell, IA	AMATEUR RADIO REPORT OF SUBSTANTIAL FARM DAMAGE TO OUT BUILDINGS AND ROOFS NEAR 120TH AND UBAN AVE IN ADAMS CONTY

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 2, 6:47 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.9 hours before the alert went out and 159 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: 1593 J/kg
Mixed-layer CIN: -188 J/kg
Mixed-layer LCL: 1258 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 170 m²/s²
0-3 km storm-relative helicity: 196 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

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

786 
WFUS53 KDMX 022355
TORDMX
IAC003-175-030030-
/O.NEW.KDMX.TO.W.0022.150802T2355Z-150803T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
655 PM CDT SUN AUG 2 2015

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* TORNADO WARNING FOR...
  WEST CENTRAL UNION COUNTY IN SOUTH CENTRAL IOWA...
  NORTHEASTERN ADAMS COUNTY IN SOUTHWESTERN IOWA...

* UNTIL 730 PM CDT
    
* AT 655 PM CDT...A TORNADO PRODUCING STORM WAS LOCATED 6 MILES WEST
  OF GREEN VALLEY LAKE...OR 7 MILES WEST OF CRESTON...MOVING
  SOUTHEAST AT 15 MPH.

  HAZARD...TORNADO AND QUARTER SIZE HAIL. 

  SOURCE...RADAR CONFIRMED TORNADO. 

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

* LOCATIONS IMPACTED INCLUDE...
  CROMWELL AND KENT. 

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 4114 9460 4115 9447 4097 9436 4092 9450
TIME...MOT...LOC 2355Z 332DEG 11KT 4107 9451 

TORNADO...OBSERVED
HAIL...1.00IN

$$

ANGLE

2 follow-up statements

091 
WWUS53 KDMX 030004
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
704 PM CDT SUN AUG 2 2015

IAC003-175-030030-
/O.CON.KDMX.TO.W.0022.000000T0000Z-150803T0030Z/
UNION IA-ADAMS IA-
704 PM CDT SUN AUG 2 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR WEST
CENTRAL UNION AND NORTHEASTERN ADAMS COUNTIES...
    
AT 704 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED 6 MILES WEST OF CRESTON...MOVING SOUTHEAST AT 15 MPH.

HAZARD...TORNADO AND HALF DOLLAR SIZE HAIL. 

SOURCE...RADAR INDICATED ROTATION. 

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

LOCATIONS IMPACTED INCLUDE...
CROMWELL AND KENT. 

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 4114 9460 4115 9447 4097 9436 4092 9450
TIME...MOT...LOC 0004Z 332DEG 11KT 4104 9449 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

ANGLE

156 
WWUS53 KDMX 030013
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
713 PM CDT SUN AUG 2 2015

IAC003-175-030022-
/O.CAN.KDMX.TO.W.0022.000000T0000Z-150803T0030Z/
UNION IA-ADAMS IA-
713 PM CDT SUN AUG 2 2015

...THE TORNADO WARNING FOR WEST CENTRAL UNION AND NORTHEASTERN ADAMS
COUNTIES IS CANCELLED...
    
THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS
BEEN CANCELLED. HOWEVER...LARGE HAIL AND DAMAGING WINDS REMAIN LIKELY
AND A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR THE AREA.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT FOR
SOUTHWESTERN IOWA.

REMEMBER...A SEVERE THUNDERSTORM WARNING STILL REMAINS IN EFFECT 
UNTIL 8 PM.

LAT...LON 4114 9460 4115 9447 4097 9436 4092 9450
TIME...MOT...LOC 0010Z 332DEG 11KT 4102 9447 

$$

ANGLE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 4:37 AM CDT	Severe Thunderstorm Warning	DMX	Audubon	41 min
Aug 2, 5:06 AM CDT	Special Weather Statement	DMX	Calhoun, Carroll, Greene	54 min
Aug 2, 5:35 AM CDT	Special Weather Statement	DMX	Wayne	40 min
Aug 2, 6:35 AM CDT	Special Weather Statement	DMX	Story	55 min
Aug 2, 5:02 PM CDT	Special Weather Statement	DMX	Adair, Madison, Warren	58 min
Aug 2, 5:07 PM CDT	Severe Thunderstorm Warning	DMX	Adair	38 min
Aug 2, 5:22 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Madison, Polk, Warren	38 min
Aug 2, 5:45 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Madison, Union	45 min
Aug 2, 5:48 PM CDT	Special Weather Statement	DMX	Adams	57 min
Aug 2, 6:00 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Madison, Warren	45 min
Aug 2, 6:07 PM CDT	Severe Thunderstorm Warning	DMX	Adams, Cass	38 min
Aug 2, 6:11 PM CDT	Special Weather Statement	DMX	Marion	64 min
Aug 2, 6:18 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Mahaska, Marion	42 min
Aug 2, 6:26 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Clarke, Madison, Ringgold, Union	49 min
Aug 2, 6:30 PM CDT	Tornado Warning Tornado observed	DMX	Adams	30 min
Aug 2, 6:41 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Madison, Warren	49 min
Aug 2, 6:58 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska	23 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.