Alert archive / Iowa / Flash Flood Watches in 2007
Flash Flood Watch 6, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood watch at Aug 20, 2007, 3:48 AM CDT for 10 counties in Iowa; 6 counties in Minnesota. It took effect at Aug 20, 2007, 1:00 PM CDT. It was in force for 11 hr.
The area
The counties it named.
The facts
- Issued
- Aug 20, 2007, 3:48 AM CDT (08:48 UTC)
- In effect from
- Aug 20, 2007, 1:00 PM CDT
- Expired
- Aug 20, 2007, 11:45 PM CDT
- In force
- 11 hr
- Issued by
- NWS Sioux Falls, SD
- Flood severity
- None
Counties Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN
The radar
The Sioux Falls radar (KFSD), 93 km from the middle of the area, began a volume at 08:49 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
Omaha, NE (KOAX), launched 00:00Z, 8.8 hours before the alert went out and 231 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
- 2841 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 965 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 115 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 3.9
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 Sioux Falls, SD wrote its last area forecast discussion before this flash flood watch went out at Aug 19, 11:45 PM CDT, 4 hours 3 minutes earlier.
Area forecast discussion, Aug 19, 11:45 PM CDT, 4 hours 3 minutes before
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</html>Hazardous weather outlook, Aug 19, 10:43 PM CDT, 5 hours 5 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 1043 PM CDT SUN AUG 19 2007 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-201200- AURORA-BEADLE-BON HOMME-BROOKINGS-BRULE-BUENA VISTA IA- CHARLES MIX-CHEROKEE IA-CLAY-CLAY IA-COTTONWOOD MN-DAKOTA NE- DAVISON-DICKINSON IA-DIXON NE-DOUGLAS-GREGORY-HANSON-HUTCHINSON- IDA IA-JACKSON MN-JERAULD-KINGSBURY-LAKE-LINCOLN-LINCOLN MN- LYON IA-LYON MN-MCCOOK-MINER-MINNEHAHA-MOODY-MURRAY MN-NOBLES MN- OBRIEN IA-OSCEOLA IA-PIPESTONE MN-PLYMOUTH IA-ROCK MN-SANBORN- SIOUX IA-TURNER-UNION-WOODBURY IA-YANKTON- 1043 PM CDT SUN AUG 19 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... SCATTERED THUNDERSTORMS WILL CONTINUE ACROSS NORTHWEST IOWA AND SOUTHWEST MINNESOTA THIS EVENING AND INTO THE OVERNIGHT HOURS. THESE STORMS ARE NOT EXPECTED TO BECOME SEVERE...HOWEVER HEAVY RAIN IS LIKELY WITH SOME STORMS...WITH LOCALIZE FLASH FLOODING POSSIBLE. AN AREA OF THUNDERSTORMS OVER WESTERN SOUTH DAKOTA THIS EVENING...WILL MOVE ACROSS THE STATE DURING THE OVERNIGHT HOURS. THESE STORMS ARE NOT EXPECTED TO BE SEVERE. FLOODING... SCATTERED THUNDERSTORMS THIS EVENING WILL BE CAPABLE OF PRODUCING VERY HEAVY RAIN...WITH RAINFALL RATES OF 1 TO 2 INCHES PER HOUR. LOCALIZED FLASH FLOODING WILL BE POSSIBLE WITH STRONGER THUNDERSTORMS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY SCATTERED THUNDERSTORMS ARE POSSIBLE OVER MUCH OF THE TRISTATE AREA MONDAY MORNING...MOST OF WHICH ARE NOT EXPECTED TO BECOME SEVERE. HOWEVER...THERE IS A CHANCE OF SEVERE STORMS MONDAY AFTERNOON. A MORE ORGANIZED AREA OF THUNDERSTORMS IS LIKELY TO DEVELOP TUESDAY AFTERNOON OVER FAR SOUTHEAST SOUTH DAKOTA AND SOUTHWEST MINNESOTA...PRESSING THROUGH NORTHWEST IOWA BY EARLY EVENING. THESE STORMS WOULD HAVE A HIGHER POTENTIAL FOR MORE WIDESPREAD SEVERE WEATHER...WITH THE THREAT FOR SOMEWHAT LARGER HAIL AND STRONGER WINDS THAN MONDAY...AS WELL AS THE THREAT FOR A FEW TORNADOES ACROSS NORTHWEST IOWA...EXTREME NORTHEAST NEBRASKA AND FAR SOUTHEAST SOUTH DAKOTA. MORE THUNDERSTORMS WILL AFFECT THE AREA LATER IN THE WEEK...FOCUSING MAINLY ON THE NIGHTTIME INTO EARLY MORNING HOURS. WHILE SOME THREAT FOR SEVERE STORMS WILL EXIST...HEAVY RAINFALL WILL ALSO BE A THREAT...ESPECIALLY FROM THE LOWER MISSOURI VALLEY THROUGH NORTHWEST IOWA. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT LIKELY TONIGHT. && FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.CRH.NOAA.GOV/FSD. THIS INCLUDES THE GRAPHICAL HAZARDOUS WEATHER OUTLOOK. LIEBL
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 5:48 AM CDT | Severe Thunderstorm Warning | FSD | Gregory | 27 min |
| Aug 20, 6:08 AM CDT | Severe Thunderstorm Warning | FSD | Gregory | 26 min |
| Aug 20, 9:02 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 28 min |
| Aug 20, 9:12 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, O'Brien, Sioux | 48 min |
| Aug 20, 9:46 AM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 29 min |
| Aug 20, 10:15 AM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 30 min |
| Aug 20, 3:01 PM CDT | River Flood Warning | FSD | Clay, Dickinson | 67 hr |
| Aug 20, 3:01 PM CDT | River Flood Warning | FSD | Buena Vista | 7 days |
| Aug 20, 9:04 AM CDT | Severe Thunderstorm Warning | FSD | Jackson | 26 min |
Nearby
Flash Flood Watches in Iowa, 2007Flash Flood Watches in Minnesota, 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.