Alert archive / Iowa / Flash Flood Watches in 2007
Flash Flood Watch 6, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood watch at Jul 17, 2007, 3:50 PM CDT for Black Hawk County, Bremer County, Butler County, Iowa. It took effect at Jul 17, 2007, 7:00 PM CDT. It was in force for 33 hr.
The area
The counties it named.
The facts
- Issued
- Jul 17, 2007, 3:50 PM CDT (20:50 UTC)
- In effect from
- Jul 17, 2007, 7:00 PM CDT
- Expired
- Jul 19, 2007, 3:46 AM CDT
- In force
- 33 hr
- Issued by
- NWS Des Moines, IA
- Flood severity
- None
Counties Black Hawk County, IA, Bremer County, IA, Butler County, IA
The radar
The Des Moines radar (KDMX), 146 km from the middle of the area, began a volume at 20:52 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
Minneapolis, MN (KMPX), launched 12:00Z, 8.8 hours before the alert went out and 260 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.
- Mixed-layer CAPE
- 189 J/kg
- Mixed-layer CIN
- -314 J/kg
- Mixed-layer LCL
- 1155 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
What forecasters said that day
The local office's own words before this flash flood watch 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 watch went out at Jul 17, 3:25 PM CDT, 25 minutes earlier.
Area forecast discussion, Jul 17, 3:25 PM CDT, 25 minutes before
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HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 526 AM CDT TUE JUL 17 2007 IAZ004>007-015>017-024>028-036>039-048>050-061-062-075-086-097- 181100- EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO- HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-HAMILTON-HARDIN-GRUNDY- BLACK HAWK-STORY-MARSHALL-TAMA-JASPER-POWESHIEK-MAHASKA-WAPELLO- DAVIS- 526 AM CDT TUE JUL 17 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA...MAINLY EAST OF A LINE FROM EMMETSBURG TO AMES AND OTTUMWA. .DAY ONE...TODAY AND TONIGHT EXPECT PERIODS OF THUNDERSTORMS TODAY INTO TONIGHT WITH THE BEST COVERAGE EAST OF INTERSTATE 35 AND NORTH OF HIGHWAY 30. SOME STORMS MAY BE SEVERE WITH LARGE HAIL AND DAMAGING STRAIGHT LINE WINDS. AN ISOLATED TORNADO IS POSSIBLE DURING THE LATE AFTERNOON AS WELL. HEAVY RAIN WILL ALSO BE LIKELY WITH ANY STORMS WITH LOCALIZED FLASH FLOODING A POSSIBILITY. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY SCATTERED THUNDERSTORMS ARE FORECAST ON WEDNESDAY INTO THURSDAY AS WELL. SEVERE STORMS REMAIN POSSIBLE WITH LARGE HAIL AND DAMAGING WINDS. HEAVY RAINS WILL ALSO REMAIN POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NECESSARY AT VARIOUS TIME TODAY AND TONIGHT. SPOTTER ACTIVATION MAY ALSO BE NEEDED ON WEDNESDAY INTO THURSDAY. IAZ023-033>035-044>047-057>060-070>074-081>085-092>096-181100- POCAHONTAS-SAC-CALHOUN-WEBSTER-CRAWFORD-CARROLL-GREENE-BOONE- AUDUBON-GUTHRIE-DALLAS-POLK-CASS-ADAIR-MADISON-WARREN-MARION- ADAMS-UNION-CLARKE-LUCAS-MONROE-TAYLOR-RINGGOLD-DECATUR-WAYNE- APPANOOSE- 526 AM CDT TUE JUL 17 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA...MAINLY WEST OF A LINE FROM POCAHONTAS TO DES MOINES AND CENTERVILLE. .DAY ONE...TODAY AND TONIGHT THERE IS A SLIGHT CHANCE OF THUNDERSTORMS TODAY AND TONIGHT. SEVERE WEATHER IS NOT EXPECTED AT THIS TIME. TEMEPRATURES WILL ALSO BE QUITE WARM BY THIS AFTERNOON WITH HIGHS IN THE LOW TO MID 90S WITH HEAT INDICIES OF 100 TO 105 DEGREES. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THE THREAT FOR THUNDERSTORMS WILL INCREASE BY LATER WEDNESDAY AND CONTINUE INTO THURSDAY. SOME SEVERE STORMS WILL BE POSSIBLE WITH LARGE HAIL AND DAMAGING WINDS THE MAIN THREAT. HEAVY RAINFALL IS ALSO EXPECTED WITH THESE STORMS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED TODAY OR TONIGHT. HOWEVER...SPOTTER ACTIVATION MAY BE NECESSARY BY LATER WEDNESDAY INTO THURSDAY. CC
In the hours before
Local storm report, Jul 17, 11:13 AM CDT, 4 hours 37 minutes before
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</html>Local storm report, Jul 17, 12:08 PM CDT, 3 hours 42 minutes before
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</html>Local storm report, Jul 17, 12:39 PM CDT, 3 hours 11 minutes before
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</html>The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 16, 7:10 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk | 65 min |
| Jul 16, 7:14 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo | 16 min |
| Jul 16, 7:40 PM CDT | Severe Thunderstorm Warning | DMX | Butler, Franklin | 50 min |
| Jul 16, 8:02 PM CDT | Severe Thunderstorm Warning | DMX | Grundy | 43 min |
| Jul 16, 8:22 PM CDT | Severe Thunderstorm Warning | DMX | Bremer | 38 min |
| Jul 16, 8:29 PM CDT | Tornado Warning | DMX | Black Hawk, Grundy, Tama | 31 min |
| Jul 17, 4:26 AM CDT | Severe Thunderstorm Warning | DMX | Black Hawk | 41 min |
| Jul 17, 5:36 AM CDT | Severe Thunderstorm Warning | DMX | Bremer | 39 min |
Nearby
Flash Flood Watches in Iowa, 2007Every flash flood watch 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.