Alert archive / Iowa / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 101, NWS Des Moines, IA

July 18, 2016Boone County, Greene County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 18, 2016, 1:41 AM CDT for Boone County, Greene County, Iowa. It was in force for 29 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: Jul 18, 2016, 1:41 AM CDT (06:41 UTC)
Expired: Jul 18, 2016, 2:10 AM CDT
In force: 29 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Boone County, IA, Greene County, IA

The radar

The Des Moines radar (KDMX), 53 km from the middle of the area, began a volume at 06:45 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.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 6.7 hours before the alert went out and 190 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: 1666 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 1396 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

As transmitted.

383 
WUUS53 KDMX 180641
SVRDMX
IAC015-073-180730-
/O.NEW.KDMX.SV.W.0101.160718T0641Z-160718T0730Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
141 AM CDT MON JUL 18 2016

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN GREENE COUNTY IN WEST CENTRAL IOWA...
  WEST CENTRAL BOONE COUNTY IN CENTRAL IOWA...

* UNTIL 230 AM CDT

* AT 141 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER JEFFERSON...
  MOVING EAST AT 30 MPH.

  HAZARD...QUARTER SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...DAMAGE TO VEHICLES IS EXPECTED. 

* LOCATIONS IMPACTED INCLUDE...
  JEFFERSON...OGDEN...GRAND JUNCTION...BEAVER AND JEFFERSON MUNICIPAL
  AIRPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4191 9440 4200 9444 4212 9407 4200 9402
TIME...MOT...LOC 0641Z 253DEG 26KT 4198 9435 

HAIL...1.00IN
WIND...<50MPH
 
$$

COGIL

2 follow-up statements

331 
WWUS53 KDMX 180651
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
151 AM CDT MON JUL 18 2016

IAC015-073-180730-
/O.CON.KDMX.SV.W.0101.000000T0000Z-160718T0730Z/
GREENE IA-BOONE IA-
151 AM CDT MON JUL 18 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 AM CDT
FOR EAST CENTRAL GREENE AND WEST CENTRAL BOONE COUNTIES...

AT 151 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED 7 MILES EAST OF
JEFFERSON...MOVING EAST AT 30 MPH.

HAZARD...QUARTER SIZE HAIL. 

SOURCE...RADAR INDICATED. 

IMPACT...DAMAGE TO VEHICLES IS EXPECTED. 

LOCATIONS IMPACTED INCLUDE...
OGDEN AND BEAVER. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4194 9429 4201 9429 4207 9405 4200 9402
TIME...MOT...LOC 0651Z 258DEG 26KT 4198 9424 

HAIL...1.00IN
WIND...<50MPH
 
$$

COGIL

224 
WWUS53 KDMX 180710
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
210 AM CDT MON JUL 18 2016

IAC015-073-180720-
/O.CAN.KDMX.SV.W.0101.000000T0000Z-160718T0730Z/
GREENE IA-BOONE IA-
210 AM CDT MON JUL 18 2016

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL GREENE AND WEST
CENTRAL BOONE COUNTIES IS CANCELLED...
    
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS WEAKENED.
THEREFORE...THE WARNING HAS BEEN CANCELLED.

LAT...LON 4194 9429 4201 9429 4207 9405 4200 9402
TIME...MOT...LOC 0708Z 253DEG 26KT 4202 9406 

$$

COGIL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 12:15 AM CDT	Special Weather Statement	DMX	Adams, Taylor	45 min
Jul 18, 12:57 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams	26 min
Jul 18, 1:21 AM CDT	Severe Thunderstorm Warning	DMX	Taylor	39 min
Jul 18, 1:37 AM CDT	Severe Thunderstorm Warning	DMX	Adams, Taylor	38 min
Jul 18, 1:39 AM CDT	Flash Flood Watch	DMX	Adair, Adams, Appanoose, Audubon, Boone, Carroll and 21 more	7 hr
Jul 18, 3:53 AM CDT	Flash Flood Warning	DMX	Adams, Cass, Ringgold, Taylor, Union	6 hr
Jul 18, 4:12 AM CDT	Special Weather Statement	DMX	Tama	63 min
Jul 18, 4:33 AM CDT	Special Weather Statement	DMX	Polk	57 min
Jul 18, 3:43 PM CDT	Excessive Heat Watch	DMX	Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more	36 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2016 Every severe thunderstorm warning in 2016

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.