Alert archive / Idaho / Flash Flood Warnings in 2007

Flash Flood Warning 2, NWS Pocatello, ID

July 17, 2007Custer County, Idaho

NWS Pocatello, ID issued this flash flood warning at Jul 17, 2007, 7:45 PM MDT for Custer County, Idaho. It was in force for 2 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
Jul 17, 2007, 7:45 PM MDT (01:45 UTC)
Expired
Jul 17, 2007, 9:45 PM MDT
In force
2 hr
Issued by
NWS Pocatello, ID
Area
Counties, with a storm outline in the text

County Custer County, ID

The radar

The Pocatello radar (KSFX), 184 km from the middle of the area, began a volume at 01:45 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 00:00Z, 1.8 hours before the alert went out and 189 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 00:00Z on 2007-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 11 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 00:00Z on 2007-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 119 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
11 J/kg
Mixed-layer CIN
-163 J/kg
Mixed-layer LCL
3612 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
119 m²/s²
0-3 km storm-relative helicity
193 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 180147
FFWPIH
IDC037-180345-
/O.NEW.KPIH.FF.W.0002.070718T0145Z-070718T0345Z/
/KPIH.0.ER.070718T0145Z.000000T0000Z.070718T0345Z.OO/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE POCATELLO ID
745 PM MDT TUE JUL 17 2007

THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL CUSTER COUNTY IN CENTRAL IDAHO...

* UNTIL 945 PM MDT.

* AT 739 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA. THIS AREA 
INCLUDES U. S. HIGHWAY 93 SOUTHEAST OF CHALLIS BETWEEN CHALLIS AND 
THE TOWN OF DICKEY.  RAINFALL ESTIMATED IN EXCESS OF ONE INCH IN THIS
AREA HAS CAUSED MUDSLIDES IN THE STEEP TERRAIN OF THE LOST RIVER 
RANGES.

* THE STORM PRODUCING FLASH FLOODING WILL OTHERWISE REMAIN OVER
  MAINLY RURAL AREAS OF THE INDICATED COUNTY.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

LAT...LON 4424 11423 4438 11400 4463 11398 4447 11420

$$

MESSICK
2 follow-up statements
000 
WGUS75 KPIH 180249
FFSPIH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
847 PM MDT TUE JUL 17 2007

IDC037-180345-
/O.CON.KPIH.FF.W.0002.000000T0000Z-070718T0345Z/
CUSTER ID-
847 PM MDT TUE JUL 17 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 PM MDT FOR
CENTRAL CUSTER COUNTY...

AT 841 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING BETWEEN THE TOWNS
OF CHALLIS AND DICKEY...APPROXIMATELY 7 MILES SOUTHEAST OF CHALLIS 
ON U S ROUTE 93.

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.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

LAT...LON 4424 11423 4438 11400 4463 11398 4447 11420

$$

MESSICK
000 
WGUS75 KPIH 180338
FFSPIH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
936 PM MDT TUE JUL 17 2007

IDC037-180346-
/O.EXP.KPIH.FF.W.0002.000000T0000Z-070718T0345Z/
CUSTER ID-
936 PM MDT TUE JUL 17 2007

...THE FLASH FLOOD WARNING WILL EXPIRE AT 945 PM MDT FOR CENTRAL
CUSTER COUNTY...

SUFFICIENT TIME HAS PASSED FOR FLOOD WATERS DUE TO THUNDERSTORMS TO 
DECREASE.  THE FLASH FLOOD WARNING WILL BE  ALLOWED TO EXPIRE.

MUDSLIDES ALONG U S ROUTE 93 BETWEEN CHALLIS AND DICKEY ARE STILL
SUBJECT TO OCCURRING.  IF YOU ARE PLANNING TRAVEL IN THIS AREA...BE
PREPARED FOR POSSIBLE ROAD CLOSURES.

LAT...LON 4424 11423 4438 11400 4463 11398 4447 11420

$$

MESSICK

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 7:10 PM MDTSevere Thunderstorm WarningPIHCuster31 min
Jul 18, 2:40 AM MDTRed Flag WarningPIH18 hr
Jul 18, 4:36 PM MDTFire Weather WatchPIHBannock, Bear Lake, Bonneville, Caribou, Franklin, Oneida and 1 more11 hr

Nearby

Flash Flood Warnings in Idaho, 2007Every flash flood warning in 2007

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.