Alert archive / Iowa / Tornado Warnings in 2020

Tornado Warning 2, NWS Des Moines, IA

March 28, 2020Jasper County, Marshall County, Story County, Iowa

NWS Des Moines, IA issued this tornado warning at Mar 28, 2020, 4:10 PM CDT for Jasper County, Marshall County, Story County, Iowa. It was in force for 35 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: Mar 28, 2020, 4:10 PM CDT (21:10 UTC)
Expired: Mar 28, 2020, 4:45 PM CDT
In force: 35 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Jasper County, IA, Marshall County, IA, Story County, IA

The radar

The Des Moines radar (KDMX), 42 km from the middle of the area, began a volume at 21:13 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
Mar 28, 4:26 PM CDT	TORNADO	2 Ssw Rhodes, IA	BRIEF TORNADO TOUCHDOWN JUST SOUTH OF RHODES. LOCATION ESTIMATED BY RADAR.

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
Mar 28, 2:45 PM CDT	Tornado Watch PDS	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.2 hours before the alert went out and 228 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.

996 
WFUS53 KDMX 282110
TORDMX
IAC099-127-169-282145-
/O.NEW.KDMX.TO.W.0002.200328T2110Z-200328T2145Z/

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

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Southeastern Story County in central Iowa...
  Southwestern Marshall County in central Iowa...
  Northwestern Jasper County in central Iowa...

* Until 445 PM CDT.

* At 409 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Colfax, or 11 miles northeast of Altoona, moving
  northeast at 50 mph.

  HAZARD...Tornado.

  SOURCE...Weather spotters reported a wall cloud near or just 
           northeast of Mitchellville cloud.

  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 dangerous storm will be near...
  Baxter around 420 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Valeria, Rhodes, Mingo and Melbourne.

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 4170 9326 4172 9334 4203 9327 4196 9301
TIME...MOT...LOC 2109Z 205DEG 44KT 4174 9330 

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

$$

Ansorge

2 follow-up statements

088 
WWUS53 KDMX 282120
SVSDMX

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

IAC099-127-169-282145-
/O.CON.KDMX.TO.W.0002.000000T0000Z-200328T2145Z/
Story IA-Marshall IA-Jasper IA-
420 PM CDT Sat Mar 28 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 445 PM CDT FOR
SOUTHEASTERN STORY...SOUTHWESTERN MARSHALL AND NORTHWESTERN JASPER
COUNTIES...
        
At 419 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Baxter, or 14 miles northwest of Newton, moving
northeast at 50 mph.

HAZARD...Tornado.

SOURCE...Weather spotters reported a wall cloud around 407 PM near 
         or just northeast of Mitchellville.

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
southeastern Story, southwestern Marshall and northwestern Jasper
Counties, including the following locations... Melbourne and Rhodes.

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 4177 9324 4179 9331 4202 9324 4196 9303
TIME...MOT...LOC 2119Z 205DEG 44KT 4185 9323 

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

$$

Ansorge

795 
WWUS53 KDMX 282127
SVSDMX

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

IAC099-169-282136-
/O.CAN.KDMX.TO.W.0002.000000T0000Z-200328T2145Z/
Story IA-Jasper IA-
427 PM CDT Sat Mar 28 2020

...THE TORNADO WARNING FOR SOUTHEASTERN STORY AND NORTHWESTERN JASPER
COUNTIES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

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

LAT...LON 4187 9313 4188 9323 4202 9323 4196 9303
TIME...MOT...LOC 2126Z 205DEG 44KT 4194 9317 

$$

IAC127-282145-
/O.CON.KDMX.TO.W.0002.000000T0000Z-200328T2145Z/
Marshall IA-
427 PM CDT Sat Mar 28 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 445 PM CDT FOR
SOUTHWESTERN MARSHALL COUNTY...
    
At 426 PM CDT, a severe thunderstorm capable of producing a tornado
was located near State Center, or 15 miles southwest of Marshalltown,
moving northeast at 50 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...
Melbourne and Rhodes. 

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 4187 9313 4188 9323 4202 9323 4196 9303
TIME...MOT...LOC 2126Z 205DEG 44KT 4194 9317 

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

$$

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, 4:38 PM CDT	Special Weather Statement	DMX	Hancock, Winnebago	37 min
Mar 28, 4:38 PM CDT	Tornado Warning	DMX	Marshall	22 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.