Alert archive / Iowa / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 142, NWS Des Moines, IA

June 21, 2007Black Hawk County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 21, 2007, 3:23 PM CDT for Black Hawk County, Iowa. It was in force for 67 min. 1 report 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: Jun 21, 2007, 3:23 PM CDT (20:23 UTC)
Expired: Jun 21, 2007, 4:30 PM CDT
In force: 67 min
Issued by: NWS Des Moines, IA
Area: Counties, with a storm outline in the text

County Black Hawk County, IA

The radar

The Des Moines radar (KDMX), 145 km from the middle of the area, began a volume at 20:25 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
Jun 21, 3:47 PM CDT	HAIL 0.88	Cedar Falls, IA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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, 11:59 AM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.4 hours before the alert went out and 189 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 212023
SVRDMX
IAC013-212130-
/O.NEW.KDMX.SV.W.0142.070621T2023Z-070621T2130Z/

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

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN BLACK HAWK COUNTY IN NORTHEAST IOWA...
  THIS INCLUDES THE CITY OF WATERLOO...

* UNTIL 430 PM CDT

* AT 321 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
  DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED NEAR
  CEDAR FALLS...OR ABOUT 7 MILES NORTHWEST OF WATERLOO...AND MOVING
  NORTHEAST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  6 MILES NORTHWEST OF WATERLOO BY 345 PM CDT...

LARGE HAIL CAN CAUSE SERIOUS INJURY AND EXTENSIVE PROPERTY DAMAGE.
SEEK SAFETY IN A STURDY BUILDING...AND STAY AWAY FROM WINDOWS.

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

LAT...LON 4263 9255 4264 9239 4264 9220 4250 9210
      4245 9253

$$

MOYER

1 follow-up statement

000 
WWUS53 KDMX 212104
SVSDMX

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

IAC073-212130-
/O.CON.KDMX.SV.W.0144.000000T0000Z-070621T2130Z/
GREENE IA-
405 PM CDT THU JUN 21 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT
FOR GREENE COUNTY...

AT 359 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY
SIZE HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM JEFFERSON TO 10 MILES SOUTH
OF JEFFERSON...OR ALONG A LINE EXTENDING FROM 35 MILES SOUTH OF FORT
DODGE TO 46 MILES SOUTH OF FORT DODGE...MOVING EAST AT 25 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  GRAND JUNCTION AND 7 MILES SOUTH OF DANA BY 415 PM CDT...
  RIPPEY BY 420 PM CDT...
  RIPPEY BY 425 PM CDT...

PREPARE FOR DAMAGING WINDS...FALLING TREES AND FLYING DEBRIS. MOVE
INDOORS 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 4216 9418 4186 9419 4189 9462 4217 9459

$$

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, 13 minutes earlier.

Area forecast discussion, Jun 21, 3:10 PM CDT, 13 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, 3 hours 48 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, 2:34 PM CDT, 49 minutes before

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

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

0231 PM     HAIL             EMMETSBURG              43.11N 94.68W
06/21/2007  E0.88 INCH       PALO ALTO          IA   BROADCAST MEDIA

&&

13

Local storm report, Jun 21, 2:45 PM CDT, 38 minutes before

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

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

0242 PM     HAIL             4 ESE BANCROFT          43.27N 94.14W
06/21/2007  E1.25 INCH       KOSSUTH            IA   TRAINED SPOTTER

&&

BF

Local storm report, Jun 21, 2:53 PM CDT, 30 minutes before

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

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

0252 PM     HAIL             CORWITH                 42.99N 93.96W
06/21/2007  E1.75 INCH       HANCOCK            IA   POST OFFICE

&&

PODRAZIK

Local storm report, Jun 21, 3:11 PM CDT, 12 minutes before

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

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

0242 PM     HAIL             5 S VAIL                41.99N 95.21W
06/21/2007  E0.75 INCH       CRAWFORD           IA   TRAINED SPOTTER

&&

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, 3:36 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, 6:36 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.