Alert archive / Idaho / Flash Flood Warnings in 2011
Flash Flood Warning 9, NWS Pocatello, ID
NWS Pocatello, ID issued this flash flood warning at Aug 1, 2011, 4:38 PM MDT for Butte County, Custer County, Idaho. It was in force for 2 hr. 5 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 1, 2011, 4:38 PM MDT (22:38 UTC)
- Expired
- Aug 1, 2011, 6:59 PM MDT
- In force
- 2 hr
- Issued by
- NWS Pocatello, ID
- Area
- Storm-based polygon
- Flood severity
- None
Counties Butte County, ID, Custer County, ID
The radar
The Pocatello radar (KSFX), 80 km from the middle of the area, began a volume at 22:38 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 1, 4:38 PM MDT | FLASH FLOOD | 2 Nw Arco, ID | VERY HEAVY RAIN CONTINUING WITH SMALL HAIL COVERING THE GROUND. WATER RUNNING FROM PROPERTY ON TO ADJACENT ROAD. |
| Aug 1, 4:50 PM MDT | FLOOD | Arco, ID | VERY HEAVY RAIN AND SMALL HAIL CAUSING FLOODING OF ROADWAYS IN TOWN. HAIL UP TO TWO INCHES DEEP IN SOME PARTS OF TOWN. |
| Aug 1, 4:55 PM MDT | HEAVY RAIN 1.14 | Arco, ID | INL ARCO SITE. RAIN STARTED AT 435 PM MDT AND ENDED AT 455 PM MDT...20 MINUTES. |
| Aug 1, 5:54 PM MDT | FLASH FLOOD | Arco, ID | ROAD DAMAGE AND CANELS READY TO OVERFLOW |
| Aug 1, 6:15 PM MDT | FLASH FLOOD | Arco, ID | BASEMENT IN NEW COURT HOUSE AT ARCO WAS FLOODED DO TO RAIN FROM THUNDERSTORM |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Boise Airport, ID (KBOI), launched 12:00Z, 10.6 hours before the alert went out and 233 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
- 237 J/kg
- Mixed-layer CIN
- -137 J/kg
- Mixed-layer LCL
- 1719 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 90 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
797 WGUS55 KPIH 012238 FFWPIH IDC023-037-020130- /O.NEW.KPIH.FF.W.0009.110801T2238Z-110802T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE POCATELLO 438 PM MDT MON AUG 1 2011 THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A * FLASH FLOOD WARNING FOR... EXTREME SOUTHEASTERN CUSTER COUNTY IN CENTRAL IDAHO... CENTRAL BUTTE COUNTY IN EAST CENTRAL IDAHO... THIS INCLUDES THE CITY OF ARCO... * UNTIL 730 PM MDT * AT 430 PM MDT...TRAINED WEATHER SPOTTERS REPORTED VERY HEAVY RAIN FROM A THUNDERSTORM NEAR ARCO ALONG WITH 1/2 INCH HAIL...MOVING SOUTHEAST AT 25 MPH. * LOCATIONS THAT COULD BE AFFECTED INCLUDE... RURAL CENTRAL BUTTE COUNTY... PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES... . A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. && LAT...LON 4367 11312 4349 11327 4368 11362 4383 11343 $$ HUSTON
2 follow-up statements
435 WGUS75 KPIH 012359 FFSPIH FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE POCATELLO 559 PM MDT MON AUG 1 2011 IDC023-037-020130- /O.CON.KPIH.FF.W.0009.000000T0000Z-110802T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BUTTE ID-CUSTER ID- 559 PM MDT MON AUG 1 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM MDT FOR EXTREME SOUTHEASTERN CUSTER AND CENTRAL BUTTE COUNTIES... AT 548 PM MDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED ROAD DAMAGE ADN CANALS READY TO OVERFLOW IN AND ABOUT THE ARCO AREA. THE STORM THAT PRODUCED THE HEAVY RAINFALL HAS SINCE MOVED INTO SOUTHEAST INL. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING THROUGH 730 PM MDT. && LAT...LON 4367 11312 4349 11327 4368 11362 4383 11343 $$ HUSTON
525 WGUS75 KPIH 020059 FFSPIH FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE POCATELLO 659 PM MDT MON AUG 1 2011 IDC023-037-020109- /O.CAN.KPIH.FF.W.0009.000000T0000Z-110802T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BUTTE ID-CUSTER ID- 659 PM MDT MON AUG 1 2011 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EXTREME SOUTHEASTERN CUSTER AND CENTRAL BUTTE COUNTIES... LAT...LON 4367 11312 4349 11327 4368 11362 4383 11343 $$ HUSTON
The office that day
Everything else NWS Pocatello, ID issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 7:31 PM MDT | Special Weather Statement | PIH | Bear Lake, Franklin | 89 min |
| Jul 31, 8:49 PM MDT | Special Weather Statement | PIH | Bear Lake, Franklin | 56 min |
| Jul 31, 9:55 PM MDT | Special Weather Statement | PIH | Bear Lake, Caribou | 65 min |
| Aug 1, 3:19 PM MDT | Special Weather Statement | PIH | Camas | 41 min |
| Aug 1, 3:30 PM MDT | Special Weather Statement | PIH | Custer | 45 min |
| Aug 1, 3:33 PM MDT | Special Weather Statement | PIH | Butte | 42 min |
| Aug 1, 3:59 PM MDT | Severe Thunderstorm Warning | PIH | Butte, Custer | 46 min |
| Aug 1, 4:56 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Butte | 35 min |
| Aug 1, 5:24 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville, Butte, Jefferson | 51 min |
Nearby
Flash Flood Warnings in Idaho, 2011Every flash flood warning in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.