Alert archive / Idaho / Flash Flood Warnings in 2011

Flash Flood Warning 3, NWS Pocatello, ID

July 4, 2011Bannock County, Power County, Idaho

NWS Pocatello, ID issued this flash flood warning at Jul 4, 2011, 6:09 PM MDT for Bannock County, Power County, Idaho. It was in force for 36 min. 1 report 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
Jul 4, 2011, 6:09 PM MDT (00:09 UTC)
Expired
Jul 4, 2011, 6:45 PM MDT
In force
36 min
Issued by
NWS Pocatello, ID
Area
Storm-based polygon
Flood severity
None

Counties Bannock County, ID, Power County, ID

The radar

The Pocatello radar (KSFX), 37 km from the middle of the area, began a volume at 00:10 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

TimeReportWhereRemark
Jul 4, 6:49 PM MDTFLASH FLOODPocatello, IDURBAN STREET FLOODING BY COSTCO IN POCATELLO

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 00:00Z, 0.2 hours before the alert went out and 238 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, Salt Lake City I, UT at 00:00Z on 2011-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salt Lake City I, UT at 00:00Z on 2011-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3631 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
15 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.

506 
WGUS55 KPIH 050009
FFWPIH
IDC005-077-050045-
/O.NEW.KPIH.FF.W.0003.110705T0009Z-110705T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE POCATELLO
609 PM MDT MON JUL 4 2011

THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN BANNOCK COUNTY IN SOUTHEAST IDAHO...
  THIS INCLUDES THE CITIES OF...POCATELLO...CHUBBUCK...
  EAST CENTRAL POWER COUNTY IN SOUTHEAST IDAHO...

* UNTIL 645 PM MDT

* AT 600 PM MDT...THE PUBLIC REPORTED HEAVY RAINFALL FROM A   
THUNDERSTORM NEAR ARBON VALLEY...OR 6 MILES WEST OF POCATELLO...  
MOVING EAST AT 25 MPH.

* LOCATIONS THAT COULD BE AFFECTED INCLUDE...
   POCATELLO AND  CHUBBUCK...
   PORTNEUF GAP...
   INKOM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

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 4298 11266 4302 11215 4293 11213 4289 11215
      4282 11211 4280 11214 4277 11263

$$

HUSTON
1 follow-up statement
559 
WGUS75 KPIH 050052
FFSPIH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE POCATELLO
652 PM MDT MON JUL 4 2011

IDC005-077-050101-
/O.EXP.KPIH.FF.W.0003.000000T0000Z-110705T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
POWER ID-BANNOCK ID-
652 PM MDT MON JUL 4 2011

...THE FLASH FLOOD WARNING HAS EXPIRED FOR NORTHWESTERN BANNOCK AND
EAST CENTRAL POWER COUNTIES...

LAT...LON 4298 11266 4302 11215 4293 11213 4289 11215
      4282 11211 4280 11214 4277 11263

$$

HUSTON

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 4, 6:46 PM MDTFlash Flood WarningPIHBannock, Bingham, Caribou, Power44 min
Jul 4, 7:00 PM MDTSpecial Weather StatementPIHFremont60 min
Jul 4, 8:13 PM MDTSpecial Weather StatementPIHFremont32 min
Jul 5, 3:23 PM MDTSpecial Weather StatementPIHCassia52 min
Jul 5, 3:25 PM MDTSpecial Weather StatementPIHBannock65 min
Jul 5, 3:26 PM MDTSpecial Weather StatementPIHTeton64 min
Jul 5, 3:49 PM MDTFlash Flood WarningPIHTeton86 min
Jul 5, 4:02 PM MDTSpecial Weather StatementPIHOneida58 min
Jul 5, 4:31 PM MDTSpecial Weather StatementPIHOneida59 min
Jul 5, 4:41 PM MDTSpecial Weather StatementPIHBonneville64 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.