Alert archive / Iowa / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 13, NWS Des Moines, IA

May 14, 20204 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 14, 2020, 5:14 PM CDT for 4 counties in Iowa. It was in force for 46 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 14, 2020, 5:14 PM CDT (22:14 UTC)
Expired: May 14, 2020, 6:00 PM CDT
In force: 46 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Lucas County, IA, Marion County, IA, Monroe County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 72 km from the middle of the area, began a volume at 22:14 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 14, 5:55 PM CDT	TSTM WND DMG	4 Ssw Harvey, IA	MULTIPLE LARGE TREES LIMBS DOWN ALONG HIGHWAY G62 OR PIERCE DRIVE ABOUT 3 MILES EAST OF PERSHING.

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 14, 4:24 PM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.2 hours before the alert went out and 230 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: 21 J/kg
Mixed-layer CIN: -218 J/kg
Mixed-layer LCL: 472 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 375 m²/s²
0-3 km storm-relative helicity: 374 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

545 
WUUS53 KDMX 142214
SVRDMX
IAC117-125-135-181-142300-
/O.NEW.KDMX.SV.W.0013.200514T2214Z-200514T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
514 PM CDT Thu May 14 2020

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Northwestern Monroe County in south central Iowa...
  Northeastern Lucas County in south central Iowa...
  Marion County in south central Iowa...
  Southeastern Warren County in south central Iowa...

* Until 600 PM CDT.

* At 514 PM CDT, a severe thunderstorm was located near
  Melcher-Dallas, or 12 miles north of Chariton, moving northeast at
  30 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Knoxville, Melcher-Dallas, Knoxville Raceway, Lake Red Rock, Milo,
  Lovilia, Lacona, Hamilton, Marysville and Knoxville Municipal
  Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4109 9335 4131 9344 4144 9297 4114 9290
TIME...MOT...LOC 2214Z 246DEG 27KT 4120 9333 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

Kotenberg

2 follow-up statements

527 
WWUS53 KDMX 142239
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
539 PM CDT Thu May 14 2020

IAC181-142249-
/O.CAN.KDMX.SV.W.0013.000000T0000Z-200514T2300Z/
Warren IA-
539 PM CDT Thu May 14 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WARREN COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until midnight CDT for
south central Iowa.

LAT...LON 4111 9317 4137 9324 4144 9297 4114 9290
TIME...MOT...LOC 2239Z 246DEG 27KT 4128 9310 

$$

IAC117-125-135-142300-
/O.CON.KDMX.SV.W.0013.000000T0000Z-200514T2300Z/
Monroe IA-Lucas IA-Marion IA-
539 PM CDT Thu May 14 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR NORTHWESTERN MONROE...NORTHEASTERN LUCAS AND MARION COUNTIES...

At 539 PM CDT, a severe thunderstorm was located over Knoxville,
moving northeast at 30 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Knoxville, Knoxville Raceway, Lake Red Rock, Lovilia, Hamilton,
Marysville, Knoxville Municipal Airport and Elk Rock State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

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 4111 9317 4137 9324 4144 9297 4114 9290
TIME...MOT...LOC 2239Z 246DEG 27KT 4128 9310 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

Kotenberg

649 
WWUS53 KDMX 142300
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
600 PM CDT Thu May 14 2020

IAC117-125-135-142310-
/O.EXP.KDMX.SV.W.0013.000000T0000Z-200514T2300Z/
Monroe IA-Lucas IA-Marion IA-
600 PM CDT Thu May 14 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MONROE...
NORTHEASTERN LUCAS AND MARION COUNTIES HAS EXPIRED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire.

A Severe Thunderstorm Watch remains in effect until midnight CDT for
south central Iowa.

LAT...LON 4111 9317 4137 9324 4144 9297 4114 9290
TIME...MOT...LOC 2300Z 246DEG 27KT 4134 9292 

$$

Kotenberg

The office that day

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

Issued	Product	Office	Counties	Lasted
May 14, 12:26 PM CDT	Flash Flood Watch	DMX	Davis, Wapello	11 hr
May 14, 2:36 PM CDT	Special Weather Statement	DMX	Guthrie	54 min
May 14, 3:35 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Dallas, Guthrie, Madison	40 min
May 14, 3:45 PM CDT	Special Weather Statement	DMX	Adair, Madison	45 min
May 14, 3:57 PM CDT	Special Weather Statement	DMX	Clarke, Madison, Marion, Warren	48 min
May 14, 4:08 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Madison, Warren	52 min
May 14, 4:14 PM CDT	Special Weather Statement	DMX	Dallas, Polk	61 min
May 14, 4:28 PM CDT	Special Weather Statement	DMX	Madison	32 min
May 14, 4:46 PM CDT	Tornado Warning	DMX	Clarke, Lucas, Marion, Warren	29 min
May 14, 5:01 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Warren	29 min
May 14, 5:29 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Marion, Warren	31 min
May 14, 5:44 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Union, Warren	31 min
May 14, 5:57 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion, Monroe	48 min
May 14, 6:13 PM CDT	Special Weather Statement	DMX	Decatur, Monroe, Wapello, Wayne	62 min
May 14, 6:20 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Monroe, Wapello	40 min
May 14, 6:56 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Monroe, Wapello	49 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2020 Every severe thunderstorm warning in 2020

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.