Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 10, NWS Des Moines, IA

May 3, 2018Jasper County, Marion County, Iowa

NWS Des Moines, IA issued this tornado warning at May 3, 2018, 7:45 PM CDT for Jasper County, Marion County, Iowa. It was in force for 30 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 3, 2018, 7:45 PM CDT (00:45 UTC)
Expired: May 3, 2018, 8:15 PM CDT
In force: 30 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Observed
Hail: 1.0 in

Counties Jasper County, IA, Marion County, IA

The radar

The Des Moines radar (KDMX), 57 km from the middle of the area, began a volume at 00:45 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 3, 7:45 PM CDT	TORNADO	4 Ne Swan, IA	TREES DOWN IN THE AREA.
May 3, 7:47 PM CDT	TORNADO	5 S Prairie City, IA	SPOTTER RELAYED CONFIRMATION OF TORNADO STILL ON THE GROUND, SUSPECTED MOVING SE.
May 3, 7:59 PM CDT	FUNNEL CLOUD	3 Ese Prairie City, IA

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 3, 2:57 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.8 hours before the alert went out and 215 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: 1 J/kg
Mixed-layer CIN: -170 J/kg
Mixed-layer LCL: 824 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

971 
WFUS53 KDMX 040045
TORDMX
IAC099-125-040115-
/O.NEW.KDMX.TO.W.0010.180504T0045Z-180504T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
745 PM CDT THU MAY 3 2018

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Northern Marion County in south central Iowa...
  Southwestern Jasper County in central Iowa...

* Until 815 PM CDT.

* At 744 PM CDT, a tornado producing storm was located near 
  Runnells, moving east at 30 mph.

  HAZARD...Damaging tornado and quarter size hail. 

  SOURCE...Trained spotter confirmed tornado. 

  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 storm will be near...
  Monroe around 800 PM CDT. 
  Newton and Iowa Speedway around 815 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Reasnor, Prairie City Krohn Airport, Newton Municipal Airport and
Swan.

This includes Interstate 80 between mile markers 163 and 169.
 
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 4149 9289 4143 9330 4159 9333 4173 9298
TIME...MOT...LOC 0044Z 249DEG 24KT 4153 9326 

TORNADO...OBSERVED
HAIL...1.00IN

$$

Donavon

2 follow-up statements

194 
WWUS53 KDMX 040103
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
803 PM CDT THU MAY 3 2018

IAC099-125-040115-
/O.CON.KDMX.TO.W.0010.000000T0000Z-180504T0115Z/
Marion IA-Jasper IA-
803 PM CDT THU MAY 3 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR
NORTHEASTERN MARION AND SOUTH CENTRAL JASPER COUNTIES...
        
At 802 PM CDT, a confirmed tornado was located near Iowa Speedway, or
near Newton, moving northeast at 35 mph.

HAZARD...Damaging tornado and quarter size hail. 

SOURCE...Radar confirmed tornado. 

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 includes Interstate 80 between mile markers 163 and 169.
 
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 4145 9316 4164 9320 4173 9298 4149 9289
TIME...MOT...LOC 0102Z 230DEG 30KT 4164 9310 

TORNADO...OBSERVED
HAIL...1.00IN

$$

Donavon

616 
WWUS53 KDMX 040115
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
815 PM CDT THU MAY 3 2018

IAC099-125-040125-
/O.EXP.KDMX.TO.W.0010.000000T0000Z-180504T0115Z/
Marion IA-Jasper IA-
815 PM CDT THU MAY 3 2018

...THE TORNADO WARNING FOR NORTHEASTERN MARION AND SOUTH CENTRAL
JASPER COUNTIES HAS EXPIRED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning has been allowed to expire.

A severe thunderstorm watch remains in effect until 900 PM CDT for
central and south central Iowa.

LAT...LON 4145 9316 4164 9320 4173 9298 4149 9289
TIME...MOT...LOC 0115Z 249DEG 24KT 4167 9300 

$$

Donavon

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 7:25 PM CDT	Tornado Warning	DMX	Jasper, Marion, Polk, Warren	35 min
May 3, 7:36 PM CDT	Tornado Warning	DMX	Marion, Warren	24 min
May 3, 7:50 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marshall, Story	55 min
May 3, 7:54 PM CDT	Tornado Warning	DMX	Marion	36 min
May 3, 8:23 PM CDT	Severe Thunderstorm Warning	DMX	Grundy, Hardin, Marshall, Tama	52 min
May 3, 8:28 PM CDT	Tornado Warning	DMX	Marshall, Tama	22 min
May 3, 8:48 PM CDT	Severe Thunderstorm Warning	DMX	Poweshiek, Tama	42 min
May 3, 9:11 PM CDT	Special Weather Statement	DMX	Black Hawk	64 min
May 3, 9:26 PM CDT	River Flood Warning	DMX	Black Hawk	6 days
May 3, 9:30 PM CDT	River Flood Watch	DMX	Black Hawk	5 days
May 3, 9:30 PM CDT	River Flood Watch	DMX	Wright	37 hr
May 3, 9:30 PM CDT	River Flood Watch	DMX	Polk	13 hr
May 3, 9:30 PM CDT	River Flood Warning	DMX	Webster	6 days
May 4, 12:33 AM CDT	Special Weather Statement	DMX	Black Hawk, Bremer	27 min
May 4, 10:29 AM CDT	River Flood Warning	DMX	Black Hawk, Bremer, Butler	70 hr
May 4, 10:29 AM CDT	River Flood Warning	DMX	Black Hawk	72 hr
May 4, 10:29 AM CDT	River Flood Warning	DMX	Black Hawk, Bremer, Butler	66 hr

Nearby

Tornado Warnings in Iowa, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.