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 | 309,013 |
| Episode IDepisode_id | 51,881 |
| Begin UTCbegin_utc | 2011-07-11T06:44:00+00:00 |
| End UTCend_utc | 2011-07-11T06:44:00+00:00 |
| Statestate | IOWA |
| County/zone typecz_type | C |
| County/zone namecz_name | EMMET |
| Latitudelat | 43.320 |
| Longitudelon | -94.810 |
| End latitudeend_lat | 43.320 |
| End longitudeend_lon | -94.810 |
| 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 | Emergency Manager |
| Episode narrativeepisode_narrative | A very unstable airmass was in place over Iowa with CAPE values around 6000 J/kg and lifted indices around -11 C. The downdraft CAPE was 1500 to 1900 J/kg. CAPE in the -10 to -30 C layer of the atmosphere was high, in the 800 to 1200 J/kg range, however the freezing level was 15,500 feet, limiting the hail production. The shear profile was relatively weak with 30 kts of effective shear available. Predawn temperatures were in the upper 70s to around 80, with dewpoints in the mid 70s. Precipitable water values were in the 1.5 to 2 inch range, boosted by a 35 kt low level jet. Thunderstorms formed in two complexes along a weak frontal boundary extending from Minnesota into Kansas. One of the complexes pushed north and east out of Kansas and Nebraska, the second was over southern Minnesota. The two filled in during the night as the whole system moved into richer air. An outflow boundary was located across northern Iowa from the complex in Minnesota, enhancing convection there. As the storms moved into Iowa, the primary threat came in the form of wind with wind gusts of 40 to 60 MPH associated with the fast moving forward propagating MCS. Wind damage occurred in the Atlantic area with a tree blocking U.S. Highway 6. This cluster of storms continued to move across the state at around 55 MPH. Wind damage occurred in the Des Moines area with tree branches down and power line damage caused by 60 MPH winds. A 59 MPH wind gust was recorded at the Ames Airport as the storms passed. As the complex of storms continued east out of central Iowa, widespread damage occurred across Marshall and Tama Counties with winds of 70 to 100 MPH. Two radio towers were downed, one in central Tama County, the other in northern Polk County. A local television station's weather radar was destroyed near Alleman, also in Polk County. Local wind speeds in these areas were estimated as high as 115 MPH. Widespread power outages were reported with 90% of the power still out in Marshall County, and 75% out in Tama County 12 hours after the event. Power was out for 3 to 4 days in some places. Governor Terry Brandstad gave a State Disaster Proclamation to Story, Marshall, and Tama Counties due the extensive damage. A presidential declaration for major disaster was also given to Story, Marshall, and Tama Counties. A broad area of severe damage occurred with a path 5 miles wide of EF1 type damage caused by the high winds. A path, 10 miles wide, of 70 to 80 MPH was surveyed, with a 15 to 20 mile wide path of wind speeds above 60 MPH. The damage swath was nearly continuous with no evidence of tornadoes. It extended from southern Story and northern Polk Counties, through Marshall, and Tama Counties, and was about 75 miles in length before exiting the CWA. Crop losses were substantial with around 40% or greater loss on over 100,000 acres of corn and soy beans. The corn had much more damage than the bean plants, with damage on these acres estimated at $95,000,000. Other damage occurred around the area as well. This derecho event was the most widespread one to affect central and east central Iowa since the June 1998 event. Some examples of the notable wind speeds estimated from the survey include 96 MPH near Huxley, 94 MPH near Maxwell, 70 to 90 MPH near Marshalltown, 105 MPH east of Garwin, 85 to 97 MPH between Garwin and Union Grove State Park, 100 MPH south of Traer, and south to southwest of Dysart 105 to 115 MPH, with 80 to 100 MPH winds just south of that part of the swath. One dairy farmer near Dysart reported the total loss of 300 acres of corn and $300,000 damage to the farm. Several of his dairy cows perished or had to be euthanized. The farmer said he would have to go out of the farming business after 45 years due to the extent of the loss. In Tama County, officials reported that 1000 county road signs were destroyed by the high wind. Meanwhile, the northern part of the system continued to produce strong winds with a 63 MPH wind gust reported at the Fort Dodge Airport. |
| Event narrativeevent_narrative | Pea size hail and rainfall of 1.8 inches were reported. |
| Yearyear | 2,011 |
Provenance
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