Alert archive / Iowa / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 164, NWS Des Moines, IA

June 21, 2007Wayne County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 21, 2007, 6:36 PM CDT for Wayne County, Iowa. It was in force for 39 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: Jun 21, 2007, 6:36 PM CDT (23:36 UTC)
Expired: Jun 21, 2007, 7:15 PM CDT
In force: 39 min
Issued by: NWS Des Moines, IA
Area: Counties, with a storm outline in the text

County Wayne County, IA

The radar

The Des Moines radar (KDMX), 113 km from the middle of the area, began a volume at 23:36 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.6 hours before the alert went out and 256 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: 683 J/kg
Mixed-layer CIN: -148 J/kg
Mixed-layer LCL: 1072 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 23 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KDMX 212336
SVRDMX
IAC185-220015-
/O.NEW.KDMX.SV.W.0164.070621T2336Z-070622T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
636 PM CDT THU JUN 21 2007

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WAYNE COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 715 PM CDT

* AT 632 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 15
  MILES NORTHWEST OF CORYDON...OR ABOUT 40 MILES NORTHWEST OF
  UNIONVILLE...AND MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CORYDON BY 655 PM CDT...
  CORYDON BY 700 PM CDT...
  SEYMOUR BY 715 PM CDT...

MOVE TO AN INTERIOR ROOM AND STAY AWAY FROM WINDOWS. IF YOU LIVE IN A
MOBILE HOME...SEEK SHELTER IN A STURDY BUILDING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM CDT
THURSDAY EVENING FOR SOUTHERN IOWA.

LAT...LON 4072 9357 4090 9357 4090 9339 4089 9310
      4060 9310 4059 9311

$$

MOYER

2 follow-up statements

000 
WWUS53 KDMX 212355
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
655 PM CDT THU JUN 21 2007

IAC185-220015-
/O.CON.KDMX.SV.W.0164.000000T0000Z-070622T0015Z/
WAYNE IA-
655 PM CDT THU JUN 21 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR WAYNE COUNTY...

AT 653 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR CORYDON...OR ABOUT 28 MILES NORTHWEST OF UNIONVILLE...
MOVING SOUTHEAST AT 35 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  PROMISE CITY BY 710 PM CDT...
  SEYMOUR BY 715 PM CDT...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT
FRIDAY MORNING FOR SOUTHEASTERN IOWA.

LAT...LON 4072 9357 4090 9357 4090 9339 4089 9310
      4060 9310 4059 9311

$$

MOYER

000 
WWUS53 KDMX 220009
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
709 PM CDT THU JUN 21 2007

IAC185-220019-
/O.EXP.KDMX.SV.W.0164.000000T0000Z-070622T0015Z/
WAYNE IA-
709 PM CDT THU JUN 21 2007

...THE SEVERE THUNDERSTORM WARNING FOR WAYNE COUNTY HAS BEEN ALLOWED
TO EXPIRE...

AT 705 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE AREA.
THEREFORE...THE SEVERE THUNDERSTORM WARNING HAS BEEN ALLOWED TO
EXPIRE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT
FRIDAY MORNING FOR SOUTHEASTERN IOWA.

LAT...LON 4072 9357 4090 9357 4090 9339 4089 9310
      4060 9310 4059 9311

$$

MOYER

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 21, 3:10 PM CDT, 3 hours 26 minutes earlier.

Area forecast discussion, Jun 21, 3:10 PM CDT, 3 hours 26 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE DES MOINES IA
310 PM CDT THU JUN 21 2007

.DISCUSSION...

TOO BUSY HERE...SHORT AFTER TODAYS RAIN WARM AND MOSTLY DRY THOUGH
MID WEEK MODELS PUSHING FRONTAL SYSTEM THROUGH THE UPPER MIDWEST
WITH CHANCE POPS.
&&

.AVIATION 22/18Z...

PRESENT CONCERNS WILL REMAIN WITH STRONG THUNDERSTORMS ACROSS MUCH
OF THE AREA. EXPECT SVR STORMS TO CONTINUE THROUGH THE EVENING HOURS
WITH +TSRA AND VISBYS UNDER 1 MILE AT TIMES. CIGS LOWERING TO
OVC010-020 WITH TSRA AND SHRA ACTIVITY. EXPECT ACTIVITY TO REMAIN IN
AREA THROUGH 08Z CENTRAL AND 12Z IN THE SOUTH.

&

.DMX WATCHES/WARNINGS/ADVISORIES...NONE.

&&

 LONG TERM...FORSTER/71/47/15
AVIATION/SHORT TERM...REV

Hazardous weather outlook, Jun 21, 6:16 PM CDT, 20 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
616 PM CDT THU JUN 21 2007

IAZ004>007-015>017-023>028-033>039-044>050-057>062-221115-
EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-
POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-SAC-CALHOUN-
WEBSTER-HAMILTON-HARDIN-GRUNDY-BLACK HAWK-CRAWFORD-CARROLL-GREENE-
BOONE-STORY-MARSHALL-TAMA-AUDUBON-GUTHRIE-DALLAS-POLK-JASPER-
POWESHIEK-
616 PM CDT THU JUN 21 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TONIGHT

A SEVERE STORM IS POSSIBLE LATE TONIGHT MAINLY AFTER MIDNIGHT
WHICH MAY PRODUCE LARGE HAIL OR DAMAGING WINDS.

HEAVY RAINFALL OF 1 TO 3 INCHES IS POSSIBLE. LOCALLY HIGHER
AMOUNTS CAN NOT BE RULED OUT. THESE RAINFALL AMOUNTS WHICH MAY
FALL OVER A SHORT PERIOD OF TIME COULD PRODUCE LOCAL FLASH
FLOODING ESPECIALLY AFTER MIDNIGHT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THE THREAT FOR VERY HEAVY RAINFALL WILL CONTINUE FRIDAY AND FRIDAY
NIGHT. TOTAL RAINFALL AMOUNTS FROM TONIGHT THROUGH SATURDAY
MORNING OF 2 TO 4 INCHES WITH ISOLATED AMOUNTS OVER 5 INCHES ARE
EXPECTED. FLASH FLOODING AND SIGNIFICANT RISES ON AREA RIVERS AND
STREAMS WOULD BE LIKELY IF THESE AMOUNTS VERIFY.

A SLIGHT RISK FOR SEVERE WEATHER IS FORECAST FOR FRIDAY AND FRIDAY
NIGHT WITH QUARTER SIZED HAIL AND 60 MPH WINDS POSSIBLE.

THUNDERSTORMS WILL LINGER INTO EARLY SATURDAY HOWEVER NO SEVERE
WEATHER IS ANTICIPATED.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION IS POSSIBLE AGAIN OF FRIDAY. RAINFALL REPORTS WOULD BE
GREATLY APPRECIATED DURING THE PERIOD AS WELL.

IAZ070>075-081>086-092>097-221115-
CASS-ADAIR-MADISON-WARREN-MARION-MAHASKA-ADAMS-UNION-CLARKE-LUCAS-
MONROE-WAPELLO-TAYLOR-RINGGOLD-DECATUR-WAYNE-APPANOOSE-DAVIS-
616 PM CDT THU JUN 21 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TONIGHT

A SEVERE STORM IS POSSIBLE LATE TONIGHT MAINLY AFTER MIDNIGHT
WHICH MAY PRODUCE LARGE HAIL OR DAMAGING WINDS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THERE IS A SLIGHT RISK FOR SEVERE WEATHER ON FRIDAY ESPECIALLY
DURING THE AFTERNOON AND EVENING HOURS. GOLF BALL SIZED HAIL AND
65 MPH WINDS ARE THE PRIMARY THREATS THOUGH AN ISOLATED TORNADO IS
POSSIBLE. HEAVY RAINFALL OF 1 TO 3 INCHES IS ALSO A THREAT.

.SPOTTER INFORMATION STATEMENT...

IT MAY ALSO BE REQUIRED FRIDAY AFTERNOON AND EVENING. RAINFALL
REPORTS WOULD BE GREATLY APPRECIATED DURING THE PERIOD AS WELL.

FORSTER

In the hours before

Local storm report, Jun 21, 5:56 PM CDT, 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
556 PM CDT THU JUN 21 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0532 PM     HAIL             10 SW INDIANOLA         41.26N 93.70W
06/21/2007  E0.88 INCH       WARREN             IA   TRAINED SPOTTER

0532 PM     HAIL             NEWTON                  41.70N 93.05W
06/21/2007  E0.75 INCH       JASPER             IA   TRAINED SPOTTER

&&

MBAKER

Local storm report, Jun 21, 6:02 PM CDT, 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
602 PM CDT THU JUN 21 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0600 PM     HAIL             7 E NEW VIRGINIA        41.18N 93.60W
06/21/2007  E1.00 INCH       WARREN             IA   FIRE DEPT/RESCUE

&&

31

Local storm report, Jun 21, 6:15 PM CDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
615 PM CDT THU JUN 21 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0607 PM     HAIL             LEIGHTON                41.34N 92.79W
06/21/2007  E0.75 INCH       MAHASKA            IA   PUBLIC

&&

31

Local storm report, Jun 21, 6:15 PM CDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
615 PM CDT THU JUN 21 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0607 PM     HAIL             LEIGHTON                41.34N 92.79W
06/21/2007  E0.50 INCH       MAHASKA            IA   PUBLIC

&&

31

Local storm report, Jun 21, 6:27 PM CDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
627 PM CDT THU JUN 21 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0618 PM     TSTM WND GST     1 S BROOKLYN            41.72N 92.44W
06/21/2007  E80 MPH          POWESHIEK          IA   PUBLIC

            NO DAMAGE REPORTED AT THIS TIME.

&&

KJ

Local storm report, Jun 21, 6:32 PM CDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
632 PM CDT THU JUN 21 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0630 PM     HAIL             2 N GARDEN GROVE        40.86N 93.61W
06/21/2007  E0.75 INCH       DECATUR            IA   LAW ENFORCEMENT

&&

BF

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 12:15 AM CDT	Severe Thunderstorm Warning	DMX	Worth	34 min
Jun 21, 2:14 PM CDT	Severe Thunderstorm Warning	DMX	Kossuth	61 min
Jun 21, 2:16 PM CDT	Severe Thunderstorm Warning	DMX	Palo Alto	44 min
Jun 21, 2:40 PM CDT	Severe Thunderstorm Warning	DMX	Palo Alto, Pocahontas	50 min
Jun 21, 2:42 PM CDT	Severe Thunderstorm Warning	DMX	Hancock	48 min
Jun 21, 3:01 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo	59 min
Jun 21, 3:05 PM CDT	Severe Thunderstorm Warning	DMX	Humboldt, Wright	40 min
Jun 21, 3:07 PM CDT	Severe Thunderstorm Warning	DMX	Butler	53 min
Jun 21, 3:07 PM CDT	Severe Thunderstorm Warning	DMX	Carroll, Crawford	38 min
Jun 21, 3:23 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk	67 min
Jun 21, 3:36 PM CDT	Severe Thunderstorm Warning	DMX	Butler	39 min
Jun 21, 3:39 PM CDT	Tornado Warning	DMX	Humboldt, Wright	36 min
Jun 21, 3:52 PM CDT	Severe Thunderstorm Warning	DMX	Greene	38 min
Jun 21, 3:53 PM CDT	Severe Thunderstorm Warning	DMX	Guthrie	52 min
Jun 21, 3:54 PM CDT	Severe Thunderstorm Warning	DMX	Cass	51 min
Jun 21, 3:55 PM CDT	Tornado Warning	DMX	Butler	50 min
Jun 21, 4:09 PM CDT	Tornado Warning	DMX	Black Hawk	51 min
Jun 21, 4:11 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Worth	49 min
Jun 21, 4:13 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas	47 min
Jun 21, 4:14 PM CDT	Severe Thunderstorm Warning	DMX	Bremer	46 min
Jun 21, 4:19 PM CDT	Severe Thunderstorm Warning	DMX	Butler	29 min
Jun 21, 4:22 PM CDT	Severe Thunderstorm Warning	DMX	Adair	53 min
Jun 21, 4:31 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Story	44 min
Jun 21, 4:35 PM CDT	Severe Thunderstorm Warning	DMX	Hamilton	40 min
Jun 21, 4:36 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Polk	54 min
Jun 21, 4:53 PM CDT	Tornado Warning	DMX	Story	37 min
Jun 21, 4:56 PM CDT	Severe Thunderstorm Warning	DMX	Polk, Story	49 min
Jun 21, 5:01 PM CDT	Severe Thunderstorm Warning	DMX	Madison, Warren	44 min
Jun 21, 5:08 PM CDT	Severe Thunderstorm Warning	DMX	Hardin	36 min
Jun 21, 5:16 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk	44 min
Jun 21, 5:17 PM CDT	Severe Thunderstorm Warning	DMX	Jasper	43 min
Jun 21, 5:23 PM CDT	Tornado Warning	DMX	Madison, Warren	37 min
Jun 21, 5:24 PM CDT	Tornado Warning	DMX	Black Hawk	36 min
Jun 21, 5:43 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas	47 min
Jun 21, 5:49 PM CDT	Severe Thunderstorm Warning	DMX	Marion, Warren	41 min
Jun 21, 5:57 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Poweshiek	63 min
Jun 21, 6:11 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur	49 min
Jun 21, 6:44 PM CDT	Severe Thunderstorm Warning	DMX	Monroe	26 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2007 Every severe thunderstorm warning in 2007

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.