Alert archive / Iowa / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 160, NWS Des Moines, IA

June 21, 2007Clarke County, Lucas County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 21, 2007, 5:43 PM CDT for Clarke County, Lucas County, Iowa. It was in force for 47 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, 5:43 PM CDT (22:43 UTC)
Expired: Jun 21, 2007, 6:30 PM CDT
In force: 47 min
Issued by: NWS Des Moines, IA
Area: Counties, with a storm outline in the text

Counties Clarke County, IA, Lucas County, IA

The radar

The Des Moines radar (KDMX), 75 km from the middle of the area, began a volume at 22:45 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.

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 21, 3:55 PM CDT	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.7 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: 1363 J/kg
Mixed-layer CIN: -202 J/kg
Mixed-layer LCL: 1155 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 46 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 212243
SVRDMX
IAC039-117-212330-
/O.NEW.KDMX.SV.W.0160.070621T2243Z-070621T2330Z/

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

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CLARKE COUNTY IN SOUTH CENTRAL IOWA...
  NORTHWESTERN LUCAS COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 630 PM CDT

* AT 541 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 9 MILES
  NORTHEAST OF OSCEOLA...OR ABOUT 30 MILES SOUTH OF DES MOINES...AND
  MOVING EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  8 MILES NORTH OF WOODBURN BY 555 PM CDT...

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 32 AND 42.

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

LAT...LON 4098 9356 4099 9372 4100 9395 4101 9395
      4115 9389 4116 9358 4116 9334 4108 9344

$$

2 follow-up statements

000 
WWUS53 KDMX 212303
SVSDMX

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

IAC039-117-212330-
/O.CON.KDMX.SV.W.0160.000000T0000Z-070621T2330Z/
LUCAS IA-CLARKE IA-
603 PM CDT THU JUN 21 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR NORTHERN CLARKE AND NORTHWESTERN LUCAS COUNTIES...

AT 558 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR OSCEOLA...OR ABOUT 35 MILES SOUTH OF DES MOINES...MOVING
EAST AT 35 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  RURAL WESTERN LUCAS COUNTY AT 620 PM CDT

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 32 AND 42.

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

LAT...LON 4098 9356 4099 9372 4100 9395 4101 9395
      4115 9389 4116 9358 4116 9334 4108 9344

$$

000 
WWUS53 KDMX 212328
SVSDMX

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

IAC039-117-212338-
/O.EXP.KDMX.SV.W.0160.000000T0000Z-070621T2330Z/
LUCAS IA-CLARKE IA-
628 PM CDT THU JUN 21 2007

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CLARKE AND
NORTHWESTERN LUCAS COUNTIES HAS BEEN ALLOWED TO EXPIRE...

AT 623 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.

REPORT TORNADOES...WIND IN EXCESS OF 50 MPH...HAIL LARGER THAN ONE
HALF INCH...OR STORM DAMAGE BY CALLING LOCAL LAW ENFORCEMENT AND
ASKING THEM TO RELAY THE REPORT TO THE NATIONAL WEATHER SERVICE.

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

LAT...LON 4098 9356 4099 9372 4100 9395 4101 9395
      4115 9389 4116 9358 4116 9334 4108 9344

$$

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, 2 hours 33 minutes earlier.

Area forecast discussion, Jun 21, 3:10 PM CDT, 2 hours 33 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, 11:35 AM CDT, 6 hours 8 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE DES MOINES IA
1135 AM CDT THU JUN 21 2007

IAZ004>007-015>017-023>028-033>039-044>050-057>062-074-075-221100-
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-MARION-MAHASKA-
1135 AM CDT THU JUN 21 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL AND
NORTH CENTRAL IOWA.

.DAY ONE...TODAY AND TONIGHT

THERE IS A MODERATE RISK FOR SEVERE WEATHER THIS AFTERNOON AND
TONIGHT. THUNDERSTORMS ARE EXPECTED THIS AFTERNOON...PRIMARILY
INCREASING IN COVERAGE THROUGH THE EVENING AND TONIGHT. GOLF BALL
SIZED HAIL...80 MPH WINDS AND ISOLATED TORNADOES ARE ALL POSSIBLE
BETWEEN 2 PM AND MIDNIGHT. QUARTER SIZED HAIL AND 60 MPH WINDS WILL
REMAIN A THREAT AFTER MIDNIGHT.

IN ADDITION...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.

.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...

ATTENTION EMERGENCY MANAGERS...A CONFERENCE CALL WILL BE CONDUCTED
AT 1 PM THIS THURSDAY AFTERNOON.

SPOTTER ACTIVATION IS EXPECTED THIS AFTERNOON AND TONIGHT ESPECIALLY
BETWEEN 3 PM AND MIDNIGHT. ACTIVATION IS POSSIBLE AGAIN OF FRIDAY.
RAINFALL REPORTS WOULD BE GREATLY APPRECIATED DURING THE PERIOD AS
WELL.

IAZ070>073-081>086-092>097-221100-
CASS-ADAIR-MADISON-WARREN-ADAMS-UNION-CLARKE-LUCAS-MONROE-WAPELLO-
TAYLOR-RINGGOLD-DECATUR-WAYNE-APPANOOSE-DAVIS-
1135 AM CDT THU JUN 21 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
IOWA.

.DAY ONE...TODAY AND TONIGHT

THERE IS A CHANCE FOR THUNDERSTORMS LATER THIS AFTERNOON AND
TONIGHT. A FEW STORMS MAY BE SEVERE WITH QUARTER SIZED HAIL AND 60
MPH 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.

THUNDERSTORMS WILL LINGER INTO SATURDAY THOUGH NO SEVERE WEATHER
IS EXPECTED.

.SPOTTER INFORMATION STATEMENT...

ATTENTION EMERGENCY MANAGERS...A CONFERENCE CALL WILL BE CONDUCTED
AT 1 PM THIS THURSDAY AFTERNOON.

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

DONAVON/REV

In the hours before

Local storm report, Jun 21, 5:25 PM CDT, 18 minutes before

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

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

0451 PM     TSTM WND DMG     POLK CITY               41.77N 93.72W
06/21/2007                   POLK               IA   LAW ENFORCEMENT

            NUMEROUS 1 FOOT DIAMETER TREE LIMBS DOWN IN POLK CITY

&&

31

Local storm report, Jun 21, 5:26 PM CDT, 17 minutes before

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

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

0522 PM     TORNADO          S WATERLOO              42.49N 92.35W
06/21/2007                   BLACK HAWK         IA   COUNTY OFFICIAL

            BRIEF TOUCHDOWN AT BARKLEY AND HOLGATE STREETS SOUTH OF
            WATERLOO

&&

MBAKER

Local storm report, Jun 21, 5:39 PM CDT, 4 minutes before

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

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

0501 PM     HAIL             2 E VAN METER           41.53N 93.92W
06/21/2007  E1.00 INCH       DALLAS             IA   TRAINED SPOTTER

&&

GFORSTER

Local storm report, Jun 21, 5:41 PM CDT, 2 minutes before

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

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

0352 PM     FUNNEL CLOUD     5 S ALLISON             42.68N 92.80W
06/21/2007                   BUTLER             IA   LAW ENFORCEMENT

&&

PODRAZIK

Local storm report, Jun 21, 5:42 PM CDT, 1 minute before

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

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

0528 PM     TSTM WND DMG     2 E WATERLOO            42.49N 92.31W
06/21/2007                   BLACK HAWK         IA   TRAINED SPOTTER

            POWER POLES SNAPPED AT BASE WINDS IN EXCESS OF 60 MPH

&&

GFORSTER

Local storm report, Jun 21, 5:43 PM CDT, 0 minutes before

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

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

0540 PM     HAIL             3 S ST. MARYS           41.27N 93.73W
06/21/2007  E0.88 INCH       WARREN             IA   TRAINED SPOTTER

&&

31

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, 5:49 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, 6:36 PM CDT	Severe Thunderstorm Warning	DMX	Wayne	39 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.