Alert archive / Iowa / Tornado Warnings in 2013
Tornado Warning 8, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at May 20, 2013, 7:24 PM CDT for Hardin County, Marshall County, Story County, Iowa. It was in force for 36 min. 3 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 20, 2013, 7:24 PM CDT (00:24 UTC)
- Expired
- May 20, 2013, 8:00 PM CDT
- In force
- 36 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.0 in
Counties Hardin County, IA, Marshall County, IA, Story County, IA
The radar
The Des Moines radar (KDMX), 61 km from the middle of the area, began a volume at 00:24 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 20, 7:24 PM CDT | HAIL 1 | 1 Nw Nevada, IA | MAINLY PEA SIZE HAIL WITH STONES UP TO QUARTER SIZE. |
| May 20, 7:25 PM CDT | HAIL 0.75 | Nevada, IA | |
| May 20, 8:10 PM CDT | TSTM WND GST 60 | 1 S Union, IA | PEA TO DIME SIZE HAIL. |
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 |
|---|---|---|---|
| May 20, 6:35 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 0.4 hours before the alert went out and 232 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.
- Mixed-layer CAPE
- 195 J/kg
- Mixed-layer CIN
- -189 J/kg
- Mixed-layer LCL
- 1801 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 101 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
The text
As transmitted, in the capitals the NWS used until 2016.
234
WFUS53 KDMX 210024
TORDMX
IAC083-127-169-210100-
/O.NEW.KDMX.TO.W.0008.130521T0024Z-130521T0100Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
724 PM CDT MON MAY 20 2013
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
* TORNADO WARNING FOR...
SOUTHEASTERN HARDIN COUNTY IN CENTRAL IOWA...
NORTHWESTERN MARSHALL COUNTY IN CENTRAL IOWA...
EASTERN STORY COUNTY IN CENTRAL IOWA...
* UNTIL 800 PM CDT
* AT 719 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
TORNADO WAS LOCATED NEAR NEVADA...AND MOVING NORTHEAST AT 45 MPH.
HAZARD...DEVELOPING TORNADO AND QUARTER SIZE HAIL.
SOURCE...RADAR INDICATED ROTATION.
IMPACT...MOBILE HOMES WILL BE HEAVILY DAMAGED OR DESTROYED.
SIGNIFICANT DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL
OCCUR. FLYING DEBRIS WILL BE DEADLY TO PEOPLE AND ANIMALS.
EXTENSIVE TREE DAMAGE IS LIKELY.
* LOCATIONS IMPACTED INCLUDE...
STATE CENTER...COLO...ZEARING...ST. ANTHONY...CLEMONS...ALBION...
UNION AND LISCOMB.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.
&&
LAT...LON 4229 9312 4210 9291 4191 9339 4205 9355
TIME...MOT...LOC 0024Z 232DEG 38KT 4202 9337
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$
AWB3 follow-up statements
923
WWUS53 KDMX 210034
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
734 PM CDT MON MAY 20 2013
IAC083-127-169-210100-
/O.CON.KDMX.TO.W.0008.000000T0000Z-130521T0100Z/
STORY IA-MARSHALL IA-HARDIN IA-
734 PM CDT MON MAY 20 2013
...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL HARDIN...
NORTHWESTERN MARSHALL AND NORTHEASTERN STORY COUNTIES UNTIL 800 PM
CDT...
AT 732 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED 7 MILES NORTHWEST OF STATE CENTER...AND MOVING NORTHEAST
AT 45 MPH.
HAZARD...DEVELOPING TORNADO AND QUARTER SIZE HAIL.
SOURCE...RADAR INDICATED ROTATION.
IMPACT...MOBILE HOMES WILL BE HEAVILY DAMAGED OR DESTROYED.
SIGNIFICANT DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL
OCCUR. FLYING DEBRIS WILL BE DEADLY TO PEOPLE AND ANIMALS.
EXTENSIVE TREE DAMAGE IS LIKELY.
LOCATIONS IMPACTED INCLUDE...
STATE CENTER...ZEARING...ST. ANTHONY...CLEMONS...ALBION AND LISCOMB.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.
&&
LAT...LON 4195 9331 4209 9349 4229 9312 4210 9291
TIME...MOT...LOC 0034Z 232DEG 38KT 4209 9326
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$
AWB972
WWUS53 KDMX 210050
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
750 PM CDT MON MAY 20 2013
IAC083-127-169-210100-
/O.CON.KDMX.TO.W.0008.000000T0000Z-130521T0100Z/
STORY IA-MARSHALL IA-HARDIN IA-
750 PM CDT MON MAY 20 2013
...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN HARDIN...
NORTHWESTERN MARSHALL AND NORTHEASTERN STORY COUNTIES UNTIL 800 PM
CDT...
AT 750 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED 11 MILES WEST OF CONRAD...AND MOVING NORTHEAST AT 45 MPH.
HAZARD...DEVELOPING TORNADO AND QUARTER SIZE HAIL.
SOURCE...RADAR INDICATED ROTATION.
IMPACT...MOBILE HOMES WILL BE HEAVILY DAMAGED OR DESTROYED.
SIGNIFICANT DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL
OCCUR. FLYING DEBRIS WILL BE DEADLY TO PEOPLE AND ANIMALS.
EXTENSIVE TREE DAMAGE IS LIKELY.
LOCATIONS IMPACTED INCLUDE...
LISCOMB.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.
&&
LAT...LON 4199 9322 4215 9338 4229 9312 4210 9291
TIME...MOT...LOC 0051Z 232DEG 38KT 4220 9307
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$
AWB643 WWUS53 KDMX 210058 SVSDMX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 758 PM CDT MON MAY 20 2013 IAC083-127-169-210108- /O.EXP.KDMX.TO.W.0008.000000T0000Z-130521T0100Z/ STORY IA-MARSHALL IA-HARDIN IA- 758 PM CDT MON MAY 20 2013 ...THE TORNADO WARNING FOR SOUTHEASTERN HARDIN...NORTHWESTERN MARSHALL AND NORTHEASTERN STORY COUNTIES WILL EXPIRE AT 800 PM CDT... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY. HOWEVER SMALL HAIL...GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH THIS THUNDERSTORM. IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1 AM. LAT...LON 4199 9322 4215 9338 4229 9312 4210 9291 TIME...MOT...LOC 0058Z 232DEG 38KT 4225 9299 $$ AWB
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 7:10 PM CDT | Tornado Warning | DMX | Polk, Story | 35 min |
| May 20, 7:39 PM CDT | Tornado Warning | DMX | Jasper, Marshall, Polk, Story | 36 min |
| May 20, 7:59 PM CDT | Severe Thunderstorm Warning | DMX | Grundy, Hardin, Marshall, Story | 31 min |
| May 20, 8:13 PM CDT | Severe Thunderstorm Warning | DMX | Grundy, Marshall, Tama | 32 min |
| May 20, 8:21 PM CDT | Severe Thunderstorm Warning | DMX | Madison, Warren | 24 min |
| May 20, 8:22 PM CDT | Severe Thunderstorm Warning | DMX | Decatur | 38 min |
| May 20, 8:26 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Butler, Grundy, Hardin | 49 min |
| May 20, 8:35 PM CDT | Severe Thunderstorm Warning | DMX | Franklin | 25 min |
| May 20, 8:45 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marion, Polk, Warren | 30 min |
| May 20, 9:11 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Lucas, Wayne | 34 min |
| May 20, 9:14 PM CDT | Severe Thunderstorm Warning | DMX | Marshall, Tama | 31 min |
Nearby
Tornado Warnings in Iowa, 2013Every tornado warning in 2013Tornadoes in 2013
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.