Alert archive / Iowa / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 21, NWS Des Moines, IA

May 3, 2015Humboldt County, Webster County, Wright County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 3, 2015, 9:05 PM CDT for Humboldt County, Webster County, Wright County, Iowa. It was in force for 25 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
May 3, 2015, 9:05 PM CDT (02:05 UTC)
Expired
May 3, 2015, 9:30 PM CDT
In force
25 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Humboldt County, IA, Webster County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 104 km from the middle of the area, began a volume at 02:06 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, 2.1 hours before the alert went out and 242 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-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 2015-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 552 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2015-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
552 J/kg
Mixed-layer CIN
-245 J/kg
Mixed-layer LCL
2278 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
113 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

662 
WUUS53 KDMX 040205
SVRDMX
IAC091-187-197-040230-
/O.NEW.KDMX.SV.W.0021.150504T0205Z-150504T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
905 PM CDT SUN MAY 3 2015

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN WEBSTER COUNTY IN CENTRAL IOWA...
  SOUTHEASTERN HUMBOLDT COUNTY IN NORTH CENTRAL IOWA...
  SOUTHWESTERN WRIGHT COUNTY IN NORTH CENTRAL IOWA...

* UNTIL 930 PM CDT

* AT 905 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 4 MILES SOUTH OF
  HUMBOLDT...OR 4 MILES SOUTH OF DAKOTA CITY...MOVING EAST AT 25 MPH.

  HAZARD...QUARTER SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...DAMAGE TO VEHICLES IS EXPECTED. 

* THIS SEVERE THUNDERSTORM WILL BE NEAR...
  EAGLE GROVE AROUND 930 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE FRANK A
GOTCH STATE PARK...VINCENT...THOR...SPORTSMAN PARK AND BADGER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4270 9387 4256 9395 4256 9397 4263 9429
      4269 9428
TIME...MOT...LOC 0205Z 276DEG 21KT 4265 9421 

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

SKOW
2 follow-up statements
142 
WWUS53 KDMX 040217
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
917 PM CDT SUN MAY 3 2015

IAC091-187-197-040230-
/O.CON.KDMX.SV.W.0021.000000T0000Z-150504T0230Z/
WEBSTER IA-HUMBOLDT IA-WRIGHT IA-
917 PM CDT SUN MAY 3 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR NORTHEASTERN WEBSTER...SOUTHEASTERN HUMBOLDT AND WEST CENTRAL
WRIGHT COUNTIES...

AT 917 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 6 MILES SOUTHEAST
OF DAKOTA CITY...MOVING EAST AT 25 MPH.

HAZARD...QUARTER SIZE HAIL. 

SOURCE...RADAR INDICATED. 

IMPACT...DAMAGE TO VEHICLES IS EXPECTED. 

THIS SEVERE STORM WILL BE NEAR...
  EAGLE GROVE AROUND 930 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE THOR AND
VINCENT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4270 9390 4258 9396 4263 9418 4269 9416
      4270 9395
TIME...MOT...LOC 0217Z 274DEG 21KT 4265 9412 

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

SKOW
662 
WWUS53 KDMX 040225
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
925 PM CDT SUN MAY 3 2015

IAC091-187-197-040234-
/O.EXP.KDMX.SV.W.0021.000000T0000Z-150504T0230Z/
WEBSTER IA-HUMBOLDT IA-WRIGHT IA-
925 PM CDT SUN MAY 3 2015

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WEBSTER...
SOUTHEASTERN HUMBOLDT AND WEST CENTRAL WRIGHT COUNTIES WILL EXPIRE AT
930 PM CDT...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 4270 9390 4258 9396 4263 9418 4269 9416
      4270 9395
TIME...MOT...LOC 0222Z 276DEG 21KT 4265 9412 

$$

SKOW

The office that day

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

IssuedProductOfficeCountiesLasted
May 3, 7:02 PM CDTSevere Thunderstorm WarningDMXHancock, Humboldt, Kossuth, Pocahontas43 min
May 3, 7:14 PM CDTSevere Thunderstorm WarningDMXWorth46 min
May 3, 7:33 PM CDTSevere Thunderstorm WarningDMXHamilton, Humboldt, Webster, Wright42 min
May 3, 7:47 PM CDTSevere Thunderstorm WarningDMXCalhoun, Humboldt, Pocahontas, Webster43 min
May 3, 7:59 PM CDTSevere Thunderstorm WarningDMXCerro Gordo, Franklin, Hancock, Worth, Wright46 min
May 3, 8:28 PM CDTSevere Thunderstorm WarningDMXHamilton, Webster47 min
May 3, 9:34 PM CDTSpecial Weather StatementDMXWebster26 min
May 3, 9:53 PM CDTSevere Thunderstorm WarningDMXHamilton22 min
May 3, 9:54 PM CDTSevere Thunderstorm WarningDMXWebster14 min
May 3, 10:27 PM CDTSpecial Weather StatementDMXPocahontas48 min
May 3, 10:38 PM CDTSevere Thunderstorm WarningDMXCalhoun, Pocahontas, Webster37 min
May 3, 11:01 PM CDTSpecial Weather StatementDMXHumboldt44 min
May 3, 11:16 PM CDTSpecial Weather StatementDMXWebster44 min
May 3, 11:32 PM CDTSpecial Weather StatementDMXWebster43 min
May 3, 11:47 PM CDTSevere Thunderstorm WarningDMXBlack Hawk, Bremer, Butler, Grundy22 min
May 4, 12:27 AM CDTSpecial Weather StatementDMXBlack Hawk, Grundy, Hamilton, Hardin48 min
May 4, 1:13 AM CDTSpecial Weather StatementDMXBlack Hawk, Grundy, Hardin, Marshall, Story47 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2015Every severe thunderstorm warning in 2015

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.