The record
Everything the slot carries, as measured. Series arrays are drawn above and listed here in full.
| Event typeevent_type | Heavy Rain |
|---|---|
| NOAA NCEI event IDncei_event_id | 43,074 |
| Episode IDepisode_id | 7,453 |
| Begin UTCbegin_utc | 2007-08-24T00:30:00+00:00 |
| End UTCend_utc | 2007-08-24T12:30:00+00:00 |
| Statestate | IOWA |
| County/zone typecz_type | C |
| County/zone namecz_name | APPANOOSE |
| Latitudelat | 40.800 |
| Longitudelon | -92.890 |
| End latitudeend_lat | 40.800 |
| End longitudeend_lon | -92.890 |
| Deaths directdeaths_direct | 0 |
| Deaths indirectdeaths_indirect | 0 |
| Injuries directinjuries_direct | 0 |
| Injuries indirectinjuries_indirect | 0 |
| Damage propertydamage_property | 0.00K |
| Damage cropsdamage_crops | 0.00K |
| Weather forecast office sourcewfo_source | COOP Observer |
| Episode narrativeepisode_narrative | A cold frontal boundary, which actually is the same boundary as had been over the state for the past several days, began to move southeast across the state during the late afternoon of the 23rd. Thunderstorms had moved across the area in the morning and left an outflow boundary that extended from southwest into east central Iowa, a ways ahead of the cold frontal boundary itself. The airmass to the south of boundary became very unstable as highs reached the upper 80s to low 90s with dew point temperatures around 80. CAPE reached around 3000 J/kg by the late afternoon with lifted indices in the -7 to -9 C. range. The environment was weakly sheared with 20 to 30 kts of shear. The airmass remained quite warm with the freezing level around 14,300 feet. The CAPE in the -10 to -30 C. layer of the atmosphere was in the 400 to 600 J/kg range, however the warm atmosphere limited hail size in most of the storms. Downdraft CAPE just south of the developing area was in the 1000 to 1200 J/kg range. The LCL was lower than the past several days, and was in the 750 to 1000 meter range. Thunderstorms fired up over southern Iowa during the late afternoon and pushed northeast across the southeast half of the state. Storms produced high winds in the Leon area in Decatur County on the south side of the line. A supercell moved through Marion and Mahaska Counties and produced penny size hail and high winds of up to 70 MPH. Rainfall of 2 inches in less than an hour caused some flash flooding in the Oskaloosa area of Mahaska County. As the storms moved east, winds of 60 MPH moved into the Ottumwa area of Wapello County. Additional thunderstorms moved into southwest Iowa, dropping 1 to 2 inch per hour rainfall in Union and Ringgold Counties. The event continued to unfold into a flash flood event. Afton in Union County was one of the higher precipitation totals with 4.7 inches falling in just a couple hours time. Many areas across southern Iowa received 2 to 5 inches of rain in just a few hours. Flash flooding was widespread across the southern 2 to 3 tiers of Iowa Counties with reports of 2 to 4 feet of water over roads. As the night progressed, the situation became progressively worse. The heaviest rain, with a band of 6 to 12 inches of rain, fell across Wayne, Appanoose, and Davis Counties. The greatest total received was from Rathbun, where 12.34 inches of rain fell in a little over 12 hours, much of it in about 9 hours. Other high totals include 8.96 inches at Centerville, 8.17 inches at Bloomfield, 8.02 inches at Promise City, and 6.85 inches at Allerton. Many locations had in excess of 5 inches. The heavy rainfall was statistically a 500 year event. An additional 6 counties were declared state flooding disaster areas. They were Van Buren, just east of the CWA, Appanoose, Wapello, Davis, Wayne, and Mahaska. Flooding was very widespread across southern Iowa with many roads washed out. School was canceled for several counties due to the flooding as well. Evacuations took place in Centerville, where 5 families were forced from their home, and in Mystic where 16 families were evacuated. Both of these locations were in Appanoose County. Flood waters inundated the water treatment plants at both Ottumwa and Mystic, leaving thousands of people without potable water. County officials in several southern Iowa counties recommended no travel anywhere in the county. Two people were stranded in Wayne County near Corydon and needed to be rescued. As the storms were moving through central Iowa, lightning struck a condominium in West Des Moines. It started a fire, which was brought under control within an hour. |
| Event narrativeevent_narrative | Extreme rainfall was reported with 12.34 inches of rain, most of the rain fell in the past 12 hours. |
| Yearyear | 2,007 |
Provenance
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