Alert archive / Idaho / Flash Flood Warnings in 2011

Flash Flood Warning 8, NWS Pocatello, ID

July 12, 2011Custer County, Idaho

NWS Pocatello, ID issued this flash flood warning at Jul 12, 2011, 1:50 PM MDT for Custer County, Idaho. It was in force for 115 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 12, 2011, 1:50 PM MDT (19:50 UTC)
Expired: Jul 12, 2011, 3:45 PM MDT
In force: 115 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon
Flood severity: None

County Custer County, ID

The radar

The Pocatello radar (KSFX), 209 km from the middle of the area, began a volume at 19:52 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
Jul 12, 2:10 PM MDT	HEAVY RAIN 0.48	1 Sse Challis, ID	RAINFALL FROM PASSING THUNDERSTORM. ALL FELL WITHIN 35 MINUTES.

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, 7.8 hours before the alert went out and 205 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2316 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: -46 m²/s²
0-3 km storm-relative helicity: 83 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.

012 
WGUS55 KPIH 121950
FFWPIH
IDC037-122145-
/O.NEW.KPIH.FF.W.0008.110712T1950Z-110712T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE POCATELLO
150 PM MDT TUE JUL 12 2011

THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL CUSTER COUNTY IN CENTRAL IDAHO...
  THIS INCLUDES THE CITY OF CHALLIS...

* UNTIL 345 PM MDT

* AT 142 PM MDT...TRAINED WEATHER SPOTTERS REPORTED FLASH FLOODING
  FROM A THUNDERSTORM NEAR CHALLIS...MOVING NORTHEAST AT 15 MPH.

* LOCATIONS THAT COULD BE AFFECTED INCLUDE...
  RURAL NORTHERN CUSTER COUNTY...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

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 4475 11419 4474 11413 4476 11411 4476 11408
      4472 11405 4467 11403 4462 11397 4440 11417
      4450 11438

$$

DSH

1 follow-up statement

555 
WGUS75 KPIH 122137
FFSPIH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE POCATELLO
337 PM MDT TUE JUL 12 2011

IDC037-122145-
/O.EXP.KPIH.FF.W.0008.000000T0000Z-110712T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CUSTER ID-
337 PM MDT TUE JUL 12 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 345 PM MDT FOR NORTH 
CENTRAL CUSTER COUNTY...

THE THREAT FOR FLASH FLOODING HAS ENDED ACROSS CENTRAL CUSTER COUNTY 
AT THIS TIME. MORE THUNDERSTORMS ARE POSSIBLE THROUGH THE REST OF 
THE AFTERNOON AND EVENING...CAPABLE OF PRODUCING LOCALLY HEAVY RAIN 
AND SMALL HAIL. PLEASE REPORT ANY FLOODING OR SEVERE WEATHER TO THE 
NATIONAL WEATHER SERVICE. 

LAT...LON 4475 11419 4474 11413 4476 11411 4476 11408
      4472 11405 4467 11403 4462 11397 4440 11417
      4450 11438

$$

JKEYES

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 6:22 PM MDT	Special Weather Statement	PIH	Bingham	38 min
Jul 11, 7:01 PM MDT	Special Weather Statement	PIH	Bonneville, Madison	44 min
Jul 11, 7:29 PM MDT	Severe Thunderstorm Warning	PIH	Bonneville, Clark, Fremont, Jefferson, Madison, Teton	46 min
Jul 11, 8:12 PM MDT	Severe Thunderstorm Warning	PIH	Clark, Fremont, Madison, Teton	33 min
Jul 12, 1:29 PM MDT	Special Weather Statement	PIH	Custer	46 min
Jul 12, 1:35 PM MDT	Areal Flood Advisory	PIH	Bonneville, Caribou	3 hr
Jul 12, 1:36 PM MDT	Severe Thunderstorm Warning	PIH	Custer	39 min
Jul 12, 2:34 PM MDT	Severe Thunderstorm Warning	PIH	Bonneville	41 min
Jul 12, 2:46 PM MDT	Severe Thunderstorm Warning	PIH	Bingham	44 min
Jul 12, 3:11 PM MDT	Special Weather Statement	PIH	Jefferson	49 min
Jul 12, 3:21 PM MDT	Special Weather Statement	PIH	Butte	39 min
Jul 12, 4:02 PM MDT	Special Weather Statement	PIH	Butte, Jefferson	58 min
Jul 12, 4:56 PM MDT	Severe Thunderstorm Warning	PIH	Clark, Fremont, Jefferson	28 min

Nearby

Flash Flood Warnings in Idaho, 2011 Every 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.