Alert archive / Iowa / Flash Flood Warnings in 2008

Flash Flood Warning 87, NWS Des Moines, IA

June 11, 2008Sac County, Iowa

NWS Des Moines, IA issued this flash flood warning at Jun 11, 2008, 8:52 PM CDT for Sac County, Iowa. It was in force for 6 hr. 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 11, 2008, 8:52 PM CDT (01:52 UTC)
Expired: Jun 12, 2008, 2:45 AM CDT
In force: 6 hr
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Flood severity: None

County Sac County, IA

The radar

The Des Moines radar (KDMX), 149 km from the middle of the area, began a volume at 01:56 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 flash flood 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

Omaha, NE (KOAX), launched 00:00Z, 1.9 hours before the alert went out and 156 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: 1641 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1105 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 232 m²/s²
0-3 km storm-relative helicity: 249 m²/s²
Significant tornado parameter: 1.9
Supercell composite: 8.7

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KDMX 120152
FFWDMX
IAC161-120745-
/O.NEW.KDMX.FF.W.0087.080612T0152Z-080612T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
852 PM CDT WED JUN 11 2008

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN SAC COUNTY IN WEST CENTRAL IOWA...

* UNTIL 245 AM CDT

* AT 847 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NEMAHA.

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE 
WARNED AREA THROUGH 10 PM...AND CLOSE TO TWO INCHES OF RAIN HAS 
ALREADY FALLEN.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

LAT...LON 4256 9540 4256 9492 4255 9492 4221 9532
      4221 9533 4247 9534 4247 9539
TIME...MOT...LOC 0152Z 180DEG 0KT 4250 9526

$$

ALBRECHT

6 follow-up statements

000 
WGUS73 KDMX 120252
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
952 PM CDT WED JUN 11 2008

IAC161-120745-
/O.CON.KDMX.FF.W.0087.000000T0000Z-080612T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAC IA-
952 PM CDT WED JUN 11 2008

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM CDT FOR
WESTERN SAC COUNTY...

AT 947 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORMS PRODUCING FLASH FLOODING OVER THE WARNED
AREA.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SCHALLER AND 
NEMAHA.

ADDITIONAL RAINFALL AMOUNTS OF A HALF TO AN INCH ARE POSSIBLE IN THE 
WARNED AREA THROUGH 1200 AM CDT.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

LAT...LON 4256 9540 4256 9492 4255 9492 4221 9532
      4221 9533 4247 9534 4247 9539
TIME...MOT...LOC 0252Z 180DEG 0KT 4250 9526

$$

ALBRECHT

000 
WGUS73 KDMX 120345
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1045 PM CDT WED JUN 11 2008

IAC161-120745-
/O.CON.KDMX.FF.W.0087.000000T0000Z-080612T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAC IA-
1045 PM CDT WED JUN 11 2008

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM CDT FOR
WESTERN SAC COUNTY...

AT 947 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE FLASH FLOODING OVER THE WARNED AREA.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SCHALLER AND 
NEMAHA.

ADDITIONAL RAINFALL AMOUNTS OF A HALF TO AN INCH ARE POSSIBLE IN THE 
WARNED AREA THROUGH 1200 AM CDT.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

LAT...LON 4256 9540 4256 9492 4255 9492 4221 9532
      4221 9533 4247 9534 4247 9539
TIME...MOT...LOC 0345Z 180DEG 0KT 4250 9526

$$

ALBRECHT

000 
WGUS73 KDMX 120453
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1151 PM CDT WED JUN 11 2008

IAC161-120745-
/O.CON.KDMX.FF.W.0087.000000T0000Z-080612T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAC IA-
1151 PM CDT WED JUN 11 2008

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM CDT FOR
WESTERN SAC COUNTY...

AT 1149 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE FLASH FLOODING OVER THE WARNED AREA.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SCHALLER AND 
NEMAHA.

ALTHOUGH THE HEAVY RAIN HAS ENDED ACROSS THE AREA FOR 
NOW...ADDITIONAL RAINFALL AMOUNTS OF ONE HALF TO ONE INCH ARE 
POSSIBLE IN THE WARNED AREA THROUGH 200 AM CDT FROM LIGHT TO 
MODERATE AREA OF RAIN MOVING NORTHEAST THROUGH THE AREA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

LAT...LON 4256 9540 4256 9492 4255 9492 4221 9532
      4221 9533 4247 9534 4247 9539
TIME...MOT...LOC 0451Z 180DEG 0KT 4250 9526

$$

ALBRECHT

000 
WGUS73 KDMX 120555
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1254 AM CDT THU JUN 12 2008

IAC161-120745-
/O.CON.KDMX.FF.W.0087.000000T0000Z-080612T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAC IA-
1254 AM CDT THU JUN 12 2008

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM CDT FOR
WESTERN SAC COUNTY...

AT 1249 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE FLASH FLOODING OVER THE WARNED AREA.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SCHALLER AND 
NEMAHA.

ALTHOUGH THE HEAVY RAIN HAS LARGELY ENDED...ADDITIONAL LIGHT TO 
MODERATE RAINFALL IS EXPECTED THROUGH 200 AM CDT WITH RAINFALL 
AMOUNTS OF A HALF AN INCH POSSIBLE IN THE WARNED AREA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

LAT...LON 4256 9540 4256 9492 4255 9492 4221 9532
      4221 9533 4247 9534 4247 9539
TIME...MOT...LOC 0554Z 180DEG 0KT 4250 9526

$$

ALBRECHT

000 
WGUS73 KDMX 120706
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
205 AM CDT THU JUN 12 2008

IAC161-120745-
/O.CON.KDMX.FF.W.0087.000000T0000Z-080612T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.IO/
SAC IA-
205 AM CDT THU JUN 12 2008

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM CDT FOR
WESTERN SAC COUNTY...

AT 202 AM CDT...HEAVY RAINFALL HAS ENDED ACROSS THE COUNTY THOUGH 
LIGHT TO MODERATE RAIN WILL CONTINUE OVER THE NEXT SEVERAL HOURS. 

LOCATIONS IN THE WARNING INCLUDE NEMAHA AND SCHALLER.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

LAT...LON 4256 9540 4256 9492 4255 9492 4221 9532
      4221 9533 4247 9534 4247 9539
TIME...MOT...LOC 0705Z 180DEG 0KT 4250 9526

$$

ALBRECHT

000 
WGUS73 KDMX 120747
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
246 AM CDT THU JUN 12 2008

IAC161-120756-
/O.EXP.KDMX.FF.W.0087.000000T0000Z-080612T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.IO/
SAC IA-
246 AM CDT THU JUN 12 2008

...THE FLASH FLOOD WARNING HAS EXPIRED FOR WESTERN SAC COUNTY...

HEAVY RAINFALL FELL ACROSS THE NORTHWEST PORTION OF THE COUNTY THIS 
EVENING. THE HEAVY RAINFALL HAS COME TO AN END THOUGH LIGHT TO 
MODERATE RAINFALL WILL CONTINUE THROUGH THE REMAINDER OF THE NIGHT. 

LAT...LON 4256 9540 4256 9492 4255 9492 4221 9532
      4221 9533 4247 9534 4247 9539
TIME...MOT...LOC 0706Z 180DEG 0KT 4250 9526

$$

DONAVON

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Jun 11, 6:48 PM CDT, 2 hours 4 minutes earlier.

Area forecast discussion, Jun 11, 6:48 PM CDT, 2 hours 4 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
648 PM CDT WED JUN 11 2008

.DISCUSSION...
LARGE MID-LEVEL CYCLONE SITS OVER NORTHERN ROCKIES WITH SHORTWAVE
SWINGING AROUND ITS SOUTHERN PERIPHERY EVIDENT ON WV IMAGERY. SFC
ANALYSIS SHOWS LOW PRESSURE NEARLY STATIONARY IN EASTERN SD WITH
WARM/STATIONARY FRONT STRETCHED ACROSS SOUTHERN MN AND WI...AND COLD
FRONT EXTENDING THROUGH EASTERN NE AND CENTRAL/WESTERN KS. DEEP
SOUTHERLY FLOW IN THE WARM SECTOR HAS ALLOWED LOW-LEVEL MOISTURE TO
POOL UP ACROSS OUR AREA...WITH DEWPOINTS NOW IN THE MID/UPPER 60S
ACROSS THE SOUTHERN 2/3 OF THE STATE. SKIES HAVE LARGELY CLEARED OUT
BEHIND EARLIER CONVECTIVE CLUSTER AND ARE NOW PARTLY CLOUDY OVER
MUCH OF CENTRAL IOWA...ALLOWING TEMPERATURES TO RISE INTO THE LOWER
80S IN SOME LOCATIONS.

WITH THE INCREASE IN LOW-LEVEL MOISTURE AND WARM AIR INSTABILITY IS
INCREASING SIGNIFICANTLY. WIND SHEAR ALSO HIGH WITH SWERLY FLOW
ALOFT AND AN 850 MB JET OVER WESTERN IA. AS THE MID-LEVEL SHORTWAVE
REVOLVES AROUND THE SOUTHEASTERN PERIPHERY OF THE LOW THIS
EVENING...IT WILL KICK THE SURFACE LOW NORTHEAST BRINGING THE COLD
FRONT THROUGH CENTRAL IA OVERNIGHT. FIRST THREAT WILL BE ISOLATED
CONVECTION IN THE WARM SECTOR WELL AHEAD OF THE FRONT THIS
EVENING/EARLY TONIGHT...HOWEVER IT APPEARS THAT WARM AIR ABOVE THE
SFC WILL PROVIDE SUFFICIENT CAP TO KEEP THIS IN CHECK. ANYTHING THAT
DOES DEVELOP IN THIS TIMEFRAME WILL HAVE A GOOD CHANCE OF GOING
SEVERE GIVEN THE ENVIRONMENT. STORMS ALONG AND JUST AHEAD OF THE
COLD FRONT WILL ENTER OUR AREA BETWEEN 00Z AND 04Z...MOVING ACROSS
THROUGH THE NIGHT. PRIMARY SEVERE THREAT WILL BE NWERN HALF OF
CWA...WITH CONVECTION TRANSITIONING TO ELEVATED AND SEVERE THREAT
DIMINISHING BUT STILL PRESENT AFTER ABOUT MIDNIGHT. QPF DIFFICULT TO
PIN DOWN TONIGHT...BUT HEAVY RAIN WILL BE WIDESPREAD WITH THE
HIGHEST AMOUNTS LIKELY EARLIER IN THE NIGHT ACROSS THE NORTHWEST.

FRONT WILL MOVE SOUTHEAST ACROSS IA ON THU AND MAY SEE ADNL TSRA
DURING THE AFTERNOON OVER THE SERN THIRD. THAT SHOULD MOVE SE OF
THE CWA BY SNST AND EXPECT IA TO MISS MOST OF THE CWA. PTRN CHNG
WILL GIVE IA A BREAK FRM THE ACTIVE WX FOR ABOUT A WEEK AS THE OVR
ALL PTRN BASICALLY SHIFTS 180 DEGREES. SOME PCPN ON TAP FOR THE
SUN INTO MON TIMEFRAME, BUT NOT AS WDSPRD OR HEAVY AS HAS BEEN THE
CASE OF LATE.

&&

.AVIATION...12/00Z
SVR SQUALL LINE ENTERING WRN IA WILL BE THE MAIN WX FEAT WITH THIS
SET.  TIMED THE SYS ACRS THE CWA OVR NGT WITH IT REACHING KFOD BY
AROUND 02Z AND KOTM ARND 08Z.  MAIN AREA LKLY TO LAST ABOUT 2 HRS
WITH SOME -TSRA AFT MAIN LINE.  OUTSIDE OF TSRA, GENL VFR CONDS WILL
HOLD THRU FCST PD.  WILL BE A CHANCE OF REDEVELOPMENT OVR THE SERN
TAFS BY THE MID DAY PERIOD ON THU...WITH ENTIRE AREA SHIFTING SWD BY
END OF TAF PD.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH THROUGH THURSDAY AFTERNOON FOR ADAIR-ADAMS-
AUDUBON-BLACK HAWK-BOONE-BREMER-BUTLER-CALHOUN-CARROLL-CASS-
CERRO GORDO-CRAWFORD-DALLAS-EMMET-FRANKLIN-GREENE-GRUNDY-GUTHRIE-
HAMILTON-HANCOCK-HARDIN-HUMBOLDT-JASPER-KOSSUTH-MADISON-MARSHALL-
PALO ALTO-POCAHONTAS-POLK-POWESHIEK-SAC-STORY-TAMA-TAYLOR-UNION-
WEBSTER-WINNEBAGO-WORTH-WRIGHT.

&&

MS JUN 08

Hazardous weather outlook, Jun 11, 3:48 PM CDT, 5 hours 4 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
348 PM CDT WED JUN 11 2008

IAZ026>028-037>039-048>050-060>062-072>075-082>086-093>097-122100-
FRANKLIN-BUTLER-BREMER-HARDIN-GRUNDY-BLACK HAWK-STORY-MARSHALL-
TAMA-POLK-JASPER-POWESHIEK-MADISON-WARREN-MARION-MAHASKA-UNION-
CLARKE-LUCAS-MONROE-WAPELLO-RINGGOLD-DECATUR-WAYNE-APPANOOSE-
DAVIS-
348 PM CDT WED JUN 11 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TONIGHT

STRONG THUNDERSTORMS WILL DEVELOP TO THE WEST AND MOVE INTO THE
AREA THIS EVENING. THE STRONG STORMS WILL ADVANCE EAST TO THE
INTERSTATE 35 CORRIDOR BY AROUND MIDNIGHT. ALL MODES OF SEVERE
WEATHER AREA LIKELY THIS EVENING. WIDESPREAD HEAVY RAIN IS ALSO
LIKELY WITH THESE STORMS.

NUMEROUS AREAL AND RIVER FLOOD WARNINGS ARE IN EFFECT ACROSS
CENTRAL IOWA. FOR ADDITIONAL INFORMATION PLEASE REFER TO THE
NATIONAL WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THERE WILL BE A CHANCE FOR THUNDERSTORMS LINGERING INTO THURSDAY
EVENING. THERE WILL BE ANOTHER CHANCE FOR THUNDERSTORMS EARLY
FRIDAY AND A BETTER CHANCE FOR STORMS ON SUNDAY INTO MONDAY. THE
SEVERE WEATHER POTENTIAL AT THIS TIME LOOKS TO BE MINIMAL WHILE
THE HEAVY RAIN POTENTIAL HAS YET TO BE DETERMINED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS LIKELY FOR A TWO TO THREE HOUR PERIOD FROM
THE BEGINNING OF THE THUNDERSTORMS THIS EVENING...AND IS NOT
EXPECTED THURSDAY.

IAZ004>007-015>017-023>025-033>036-044>047-057>059-070-071-081-
092-122100-
EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-
POCAHONTAS-HUMBOLDT-WRIGHT-SAC-CALHOUN-WEBSTER-HAMILTON-CRAWFORD-
CARROLL-GREENE-BOONE-AUDUBON-GUTHRIE-DALLAS-CASS-ADAIR-ADAMS-
TAYLOR-
348 PM CDT WED JUN 11 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TONIGHT

STRONG THUNDERSTORMS WILL DEVELOP AND MOVE INTO WESTERN IOWA THIS
EVENING. THE STORMS WILL ADVANCE TO THE INTERSTATE 35 CORRIDOR BY
AROUND MIDNIGHT...AND ACROSS OUR AREA BETWEEN MIDNIGHT AND 5 AM.
THE MAIN SEVERE WEATHER THIRD WILL BE FOR HAIL AND HIGH WINDS.
WIDESPREAD HEAVY RAIN IS ALSO LIKELY WITH THESE STORMS.

NUMEROUS AREAL AND RIVER FLOOD WARNINGS ARE IN EFFECT ACROSS
CENTRAL IOWA. FOR ADDITIONAL INFORMATION PLEASE REFER TO THE
NATIONAL WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THERE WILL BE A CHANCE FOR THUNDERSTORMS LINGERING INTO EARLY
FRIDAY. SEVERE THUNDERSTORMS WILL BE POSSIBLE SOUTHEAST OF A
LAMONI TO TAMA LINE DURING THE AFTERNOON THURSDAY. A BETTER CHANCE
FOR STORMS WILL ARRIVE ON SUNDAY INTO MONDAY. THE SEVERE WEATHER
POTENTIAL AT THIS TIME LOOKS TO BE MINIMAL WHILE THE HEAVY RAIN
POTENTIAL HAS YET TO BE DETERMINED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE FROM AROUND MIDNIGHT THROUGH THE
PREDAWN HOURS...AND POSSIBLY THURSDAY AFTERNOON.

In the hours before

Local storm report, Jun 11, 8:06 PM CDT, 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
806 PM CDT WED JUN 11 2008

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

0800 PM     TORNADO          4 S BUCK GROVE          41.86N 95.40W
06/11/2008                   CRAWFORD           IA   LAW ENFORCEMENT

&&

PODRAZIK

Local storm report, Jun 11, 8:21 PM CDT, 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
821 PM CDT WED JUN 11 2008

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

0818 PM     HEAVY RAIN       LAURENS                 42.85N 94.85W
06/11/2008  M0.00 INCH       POCAHONTAS         IA   TRAINED SPOTTER

            1.5 TO 2 INCHES OF RAIN.

&&

PODRAZIK

Local storm report, Jun 11, 8:35 PM CDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
835 PM CDT WED JUN 11 2008

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

0832 PM     TSTM WND GST     HALBUR                  42.01N 94.97W
06/11/2008  E75 MPH          CARROLL            IA   EMERGENCY MNGR

&&

COGIL

Local storm report, Jun 11, 8:37 PM CDT, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
837 PM CDT WED JUN 11 2008

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

0743 PM     TSTM WND DMG     2 S WALLINGFORD         43.29N 94.80W
06/11/2008                   EMMET              IA   EMERGENCY MNGR

            POSSIBLE TORNADO DAMAGE. 2 OUT-BUILDINGS DESTROYED.

&&

PODRAZIK

Local storm report, Jun 11, 8:40 PM CDT, 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
840 PM CDT WED JUN 11 2008

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

0838 PM     TSTM WND GST     CARROLL                 42.07N 94.86W
06/11/2008  M61.00 MPH       CARROLL            IA   MESONET

&&

COGIL

Local storm report, Jun 11, 8:42 PM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
842 PM CDT WED JUN 11 2008

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

0840 PM     TSTM WND GST     2 E ARCADIA             42.09N 95.00W
06/11/2008  E60 MPH          CARROLL            IA   TRAINED SPOTTER

&&

COGIL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 7:12 PM CDT	Tornado Warning	DMX	Emmet, Palo Alto	48 min
Jun 11, 7:29 PM CDT	Tornado Warning	DMX	Emmet, Palo Alto	46 min
Jun 11, 7:39 PM CDT	Tornado Warning	DMX	Crawford	18 min
Jun 11, 7:41 PM CDT	Tornado Warning	DMX	Palo Alto, Pocahontas	34 min
Jun 11, 7:46 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	44 min
Jun 11, 7:53 PM CDT	Tornado Warning	DMX	Crawford	52 min
Jun 11, 7:59 PM CDT	Flash Flood Warning	DMX	Crawford	6 hr
Jun 11, 8:02 PM CDT	Tornado Warning	DMX	Sac	28 min
Jun 11, 8:08 PM CDT	Flash Flood Warning	DMX	Palo Alto, Pocahontas	6 hr
Jun 11, 8:12 PM CDT	Severe Thunderstorm Warning	DMX	Kossuth	48 min
Jun 11, 8:15 PM CDT	Tornado Warning	DMX	Palo Alto, Pocahontas	45 min
Jun 11, 8:17 PM CDT	Tornado Warning	DMX	Audubon, Carroll	43 min
Jun 11, 8:26 PM CDT	Tornado Warning	DMX	Palo Alto, Pocahontas	34 min
Jun 11, 8:31 PM CDT	Tornado Warning	DMX	Carroll	29 min
Jun 11, 8:33 PM CDT	Tornado Warning	DMX	Kossuth	42 min
Jun 11, 8:48 PM CDT	Severe Thunderstorm Warning	DMX	Carroll, Greene	27 min
Jun 11, 8:48 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Sac	57 min
Jun 11, 8:59 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Cass	46 min
Jun 11, 8:59 PM CDT	Tornado Warning	DMX	Palo Alto, Pocahontas	31 min
Jun 11, 9:06 PM CDT	Flash Flood Warning	DMX	Kossuth	6 hr
Jun 11, 9:10 PM CDT	Severe Thunderstorm Warning	DMX	Webster	50 min
Jun 11, 9:12 PM CDT	Tornado Warning	DMX	Kossuth	33 min
Jun 11, 9:16 PM CDT	Flash Flood Warning	DMX	Audubon, Carroll, Cass	6 hr
Jun 11, 9:18 PM CDT	Severe Thunderstorm Warning	DMX	Greene, Guthrie	42 min
Jun 11, 9:33 PM CDT	Flash Flood Warning	DMX	Cerro Gordo, Worth	6 hr
Jun 11, 9:35 PM CDT	Severe Thunderstorm Warning	DMX	Hancock, Winnebago	40 min
Jun 11, 9:37 PM CDT	Severe Thunderstorm Warning	DMX	Kossuth, Winnebago	38 min
Jun 11, 9:54 PM CDT	Severe Thunderstorm Warning	DMX	Boone	36 min
Jun 11, 9:55 PM CDT	Flash Flood Warning	DMX	Adair, Greene, Guthrie, Webster	6 hr
Jun 11, 9:57 PM CDT	Severe Thunderstorm Warning	DMX	Hamilton, Humboldt, Webster, Wright	48 min
Jun 11, 10:01 PM CDT	Severe Thunderstorm Warning	DMX	Hamilton, Webster, Wright	44 min
Jun 11, 10:02 PM CDT	River Flood Warning	DMX	Humboldt	13 hr
Jun 11, 10:21 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Hancock	39 min
Jun 11, 10:26 PM CDT	Flash Flood Warning	DMX	Boone, Dallas	6 hr
Jun 11, 10:26 PM CDT	Severe Thunderstorm Warning	DMX	Story	49 min
Jun 11, 10:32 PM CDT	Severe Thunderstorm Warning	DMX	Hardin	43 min
Jun 11, 10:34 PM CDT	Flash Flood Warning	DMX	Franklin, Hamilton, Story, Wright	6 hr
Jun 11, 10:38 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Franklin	52 min
Jun 11, 11:01 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Grundy	44 min
Jun 11, 11:04 PM CDT	Severe Thunderstorm Warning	DMX	Grundy, Marshall, Tama	56 min
Jun 11, 11:08 PM CDT	Flash Flood Warning	DMX	Hancock, Winnebago	6 hr
Jun 11, 11:16 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo	29 min
Jun 11, 11:20 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer	55 min
Jun 11, 11:27 PM CDT	Flash Flood Warning	DMX	Adams	6 hr
Jun 12, 12:08 AM CDT	River Flood Warning	DMX	Cass	21 hr
Jun 12, 12:15 AM CDT	Flash Flood Warning	DMX	Black Hawk, Bremer, Butler, Grundy	6 hr
Jun 12, 12:23 AM CDT	Flash Flood Warning	DMX	Polk	6 hr
Jun 12, 12:28 AM CDT	Flash Flood Warning	DMX	Madison	6 hr
Jun 12, 1:28 AM CDT	Flash Flood Warning	DMX	Marshall, Tama	6 hr
Jun 12, 2:26 AM CDT	Areal Flood Warning	DMX	Palo Alto, Pocahontas	6 hr
Jun 12, 3:06 AM CDT	Areal Flood Warning	DMX	Kossuth	6 hr
Jun 12, 3:22 AM CDT	Areal Flood Warning	DMX	Audubon, Carroll, Cass	5 hr
Jun 12, 3:50 AM CDT	Areal Flood Warning	DMX	Adair, Guthrie	6 hr
Jun 12, 4:05 AM CDT	Severe Thunderstorm Warning	DMX	Decatur, Wayne	40 min
Jun 12, 4:23 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Dallas, Guthrie	23 min
Jun 12, 5:30 AM CDT	Areal Flood Warning	DMX	Adams	3 hr
Jun 12, 6:26 AM CDT	Areal Flood Warning	DMX	Madison	3 hr
Jun 12, 7:00 AM CDT	Areal Flood Warning	DMX	Adair, Adams, Audubon, Black Hawk, Boone, Bremer and 26 more	12 hr
Jun 12, 9:39 AM CDT	River Flood Warning	DMX	Decatur	34 hr
Jun 12, 12:21 PM CDT	River Flood Warning	DMX	Story	15 hr
Jun 12, 1:13 PM CDT	River Flood Warning	DMX	Lucas	38 hr
Jun 12, 1:27 PM CDT	River Flood Warning	DMX	Polk	14 hr
Jun 12, 3:04 PM CDT	Areal Flood Warning	DMX	Marion	12 hr
Jun 12, 3:09 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marion	29 min
Jun 12, 3:29 PM CDT	Severe Thunderstorm Warning	DMX	Poweshiek	27 min
Jun 12, 3:47 PM CDT	Severe Thunderstorm Warning	DMX	Tama	28 min
Jun 12, 3:58 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Poweshiek	27 min
Jun 12, 4:21 PM CDT	Tornado Warning	DMX	Appanoose, Davis	39 min
Jun 12, 4:40 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Wayne	34 min
Jun 12, 4:47 PM CDT	Severe Thunderstorm Warning	DMX	Monroe	32 min
Jun 12, 4:57 PM CDT	Tornado Warning	DMX	Davis	48 min
Jun 12, 5:06 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska	39 min
Jun 12, 5:19 PM CDT	Flash Flood Warning	DMX	Appanoose, Davis, Monroe, Wapello	12 hr
Jun 12, 5:26 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Wayne	14 min
Jun 12, 5:30 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Poweshiek	17 min
Jun 12, 5:36 PM CDT	Severe Thunderstorm Warning	DMX	Monroe	24 min
Jun 12, 5:48 PM CDT	Tornado Warning	DMX	Davis	30 min
Jun 12, 6:56 PM CDT	Areal Flood Warning	DMX	Adair, Adams, Black Hawk, Boone, Bremer, Butler and 17 more	12 hr

Nearby

Flash Flood Warnings in Iowa, 2008 Every flash flood warning in 2008

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.