Alert archive / Iowa / Tornado Warnings in 2020

Tornado Warning 3, NWS Des Moines, IA

March 28, 2020Marshall County, Iowa

NWS Des Moines, IA issued this tornado warning at Mar 28, 2020, 4:38 PM CDT for Marshall County, Iowa. It was in force for 22 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 28, 2020, 4:38 PM CDT (21:38 UTC)
Expired: Mar 28, 2020, 5:00 PM CDT
In force: 22 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Marshall County, IA

The radar

The Des Moines radar (KDMX), 68 km from the middle of the area, began a volume at 21:37 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.

The watch it was issued in

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

Issued	Product	Office	Lasted
Mar 28, 2:45 PM CDT	Tornado Watch PDS	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.6 hours before the alert went out and 221 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: 695 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: -128 m²/s²
0-3 km storm-relative helicity: 164 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

371 
WFUS53 KDMX 282138
TORDMX
IAC127-282200-
/O.NEW.KDMX.TO.W.0003.200328T2138Z-200328T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
438 PM CDT Sat Mar 28 2020

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Northwestern Marshall County in central Iowa...

* Until 500 PM CDT.

* At 437 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over State Center, or 12 miles west of Marshalltown,
  moving north at 40 mph.

  HAZARD...Tornado.

  SOURCE...Weather spotters reported a rotating wall cloud at 435pm 
           between Marshalltown and State Center.

  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 Marshall County, including the following locations...
  Clemons and Liscomb.

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 4221 9296 4197 9314 4198 9319 4221 9317
TIME...MOT...LOC 2137Z 198DEG 36KT 4200 9315 

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

$$

Ansorge

2 follow-up statements

600 
WWUS53 KDMX 282145
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
445 PM CDT Sat Mar 28 2020

IAC127-282200-
/O.CON.KDMX.TO.W.0003.000000T0000Z-200328T2200Z/
Marshall IA-
445 PM CDT Sat Mar 28 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM CDT FOR
NORTHWESTERN MARSHALL COUNTY...
    
At 445 PM CDT, a severe thunderstorm capable of producing a tornado
was located 7 miles north of State Center, or 12 miles northwest of
Marshalltown, 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.

Locations impacted include...
Liscomb and Clemons. 

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 4221 9298 4208 9308 4209 9318 4221 9317
TIME...MOT...LOC 2145Z 196DEG 40KT 4212 9311 

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

$$

Ansorge

404 
WWUS53 KDMX 282153
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
453 PM CDT Sat Mar 28 2020

IAC127-282201-
/O.EXP.KDMX.TO.W.0003.000000T0000Z-200328T2200Z/
Marshall IA-
453 PM CDT Sat Mar 28 2020

...THE TORNADO WARNING FOR NORTHWESTERN MARSHALL COUNTY WILL EXPIRE
AT 500 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Tornado Watch remains in effect until 900 PM CDT for central Iowa.

LAT...LON 4221 9298 4208 9308 4209 9318 4221 9317
TIME...MOT...LOC 2151Z 198DEG 36KT 4217 9309 

$$

Ansorge

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 28, 1:07 AM CDT	Severe Thunderstorm Warning	DMX	Monroe, Wapello	23 min
Mar 28, 2:18 AM CDT	Dense Fog Advisory	DMX	Adair, Adams, Appanoose, Boone, Clarke, Dallas and 21 more	7 min
Mar 28, 2:28 AM CDT	Dense Fog Advisory	DMX	Adair, Adams, Appanoose, Boone, Clarke, Dallas and 21 more	9 hr
Mar 28, 2:59 AM CDT	Wind Advisory	DMX	Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more	34 hr
Mar 28, 4:56 AM CDT	Special Weather Statement	DMX	Mahaska	19 min
Mar 28, 9:55 AM CDT	River Flood Warning	DMX	Davis, Wapello	12 hr
Mar 28, 10:29 AM CDT	Special Weather Statement	DMX	Marion	46 min
Mar 28, 10:35 AM CDT	Special Weather Statement	DMX	Mahaska	40 min
Mar 28, 1:31 PM CDT	Special Weather Statement	DMX	Adams	44 min
Mar 28, 2:01 PM CDT	Special Weather Statement	DMX	Adair	44 min
Mar 28, 2:24 PM CDT	Tornado Warning Tornado observed	DMX	Adair, Guthrie, Madison	27 min
Mar 28, 3:49 PM CDT	Special Weather Statement	DMX	Hamilton, Wright	41 min
Mar 28, 3:51 PM CDT	Special Weather Statement	DMX	Hancock	39 min
Mar 28, 4:08 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Franklin, Hamilton, Hancock, Wright	31 min
Mar 28, 4:10 PM CDT	Tornado Warning	DMX	Jasper, Marshall, Story	35 min
Mar 28, 4:38 PM CDT	Special Weather Statement	DMX	Hancock, Winnebago	37 min
Mar 28, 5:22 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Pocahontas, Webster	38 min
Mar 28, 5:54 PM CDT	Tornado Warning	DMX	Black Hawk	17 min
Mar 28, 6:02 PM CDT	Tornado Warning	DMX	Black Hawk	9 min

Nearby

Tornado Warnings in Iowa, 2020 Every tornado warning in 2020 Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.