Alert archive / Idaho / Flash Flood Warnings in 2009

Flash Flood Warning 21, NWS Pocatello, ID

June 17, 2009Butte County, Custer County, Idaho

NWS Pocatello, ID issued this flash flood warning at Jun 17, 2009, 1:29 PM MDT for Butte County, Custer County, Idaho. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jun 17, 2009, 1:29 PM MDT (19:29 UTC)
Expired
Jun 17, 2009, 5:30 PM MDT
In force
4 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), 96 km from the middle of the area, began a volume at 19:32 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

Boise Airport, ID (KBOI), launched 12:00Z, 7.5 hours before the alert went out and 218 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.

Skew-T log-pSkew-T log-p diagram, Boise Airport, ID at 12:00Z on 2009-06-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 80 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Boise Airport, ID at 12:00Z on 2009-06-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
80 J/kg
Mixed-layer CIN
-94 J/kg
Mixed-layer LCL
1112 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
2 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS55 KPIH 171929
FFWPIH
IDC023-037-172330-
/O.NEW.KPIH.FF.W.0021.090617T1929Z-090617T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE POCATELLO
129 PM MDT WED JUN 17 2009

THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN CUSTER COUNTY IN CENTRAL IDAHO...
  WEST CENTRAL BUTTE COUNTY IN EAST CENTRAL IDAHO...

* UNTIL 530 PM MDT

* AT 125 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
VERY HEAVY RAIN AND FLASH FLOODING FROM THUNDERSTORMS OVER THE 
WARNED AREA. RAINFALL RATES AROUND ONE INCH IN LESS THAN ONE HOUR 
ARE LIKELY.  

* LOCATIONS THAT COULD BE AFFECTED INCLUDE...
   LOST RIVER...
   DARLINGTON...
   GROUSE...
   MOORE...
   

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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
POCATELLO.

&&

LAT...LON 4375 11319 4348 11361 4380 11392 4392 11358

$$

JKEYES
1 follow-up statement
000 
WGUS75 KPIH 172323
FFSPIH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE POCATELLO
523 PM MDT WED JUN 17 2009

IDC023-037-172331-
/O.EXP.KPIH.FF.W.0021.000000T0000Z-090617T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CUSTER ID-BUTTE ID-
523 PM MDT WED JUN 17 2009

...THE FLASH FLOOD WARNING WILL EXPIRE AT 530 PM MDT FOR WEST CENTRAL
BUTTE AND SOUTHEASTERN CUSTER COUNTIES...

SHOWERS AND THUNDERSTORMS HAVE MOSTLY ENDED ACROSS THE AREA. A FEW 
SHOWERS AND THUNDERSTORMS ARE POSSIBLE UNTIL SUNSET. HOWEVER...THE 
THREAT OF HEAVY RAIN HAS ENDED. THERE MAY STILL BE SOME RUNOFF...SO 
BE CAREFUL IF YOU ENCOUNTER FLOODED ROADS OR STANDING WATER. PLEASE 
REPORT ANY FLOODING TO LOCAL LAW ENFORCEMENT OR THE NATIONAL WEATHER 
SERVICE. 

LAT...LON 4375 11319 4348 11361 4380 11392 4392 11358

$$

JKEYES

The office that day

Everything else NWS Pocatello, ID issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 17, 7:49 AM MDTFlash Flood WatchPIH21 hr
Jun 17, 11:00 AM MDTFlash Flood WarningPIHBlaine5 hr
Jun 17, 11:07 AM MDTFlash Flood WarningPIHOneida, Power7 hr
Jun 17, 12:11 PM MDTSpecial Weather StatementPIHBlaine49 min
Jun 17, 12:43 PM MDTFlash Flood WarningPIHBannock, Franklin4 hr
Jun 17, 1:06 PM MDTSpecial Weather StatementPIHJefferson24 min
Jun 17, 1:19 PM MDTSpecial Weather StatementPIHBlaine, Custer56 min
Jun 17, 1:31 PM MDTFlash Flood WarningPIHCassia3 hr
Jun 17, 2:18 PM MDTFlash Flood WarningPIHCassia3 hr
Jun 17, 2:23 PM MDTSpecial Weather StatementPIHButte, Clark, Jefferson52 min
Jun 17, 2:39 PM MDTSevere Thunderstorm WarningPIHBingham, Butte, Jefferson36 min
Jun 17, 3:07 PM MDTSpecial Weather StatementPIHBingham38 min
Jun 17, 3:26 PM MDTSpecial Weather StatementPIHJefferson64 min
Jun 17, 3:48 PM MDTSpecial Weather StatementPIHJefferson42 min
Jun 17, 3:54 PM MDTSpecial Weather StatementPIHPower66 min
Jun 17, 3:56 PM MDTSpecial Weather StatementPIHButte34 min
Jun 17, 4:36 PM MDTSpecial Weather StatementPIHFremont, Madison39 min
Jun 17, 4:57 PM MDTAreal Flood AdvisoryPIHBannock, Bingham, Power5 hr
Jun 17, 5:08 PM MDTAreal Flood AdvisoryPIHFremont3 hr

Nearby

Flash Flood Warnings in Idaho, 2009Every flash flood warning in 2009

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.