Alert archive / Idaho / Flash Flood Warnings in 1997

Flash Flood Warning 8, NWS Pocatello, ID

July 23, 1997Bannock County, Idaho

NWS Pocatello, ID issued this flash flood warning at Jul 23, 1997, 2:00 PM MDT for Bannock County, Idaho. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 23, 1997, 2:00 PM MDT (20:00 UTC)
Expired: Jul 23, 1997, 7:00 PM MDT
In force: 5 hr
Issued by: NWS Pocatello, ID
Area: Whole counties

County Bannock County, ID

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 8.0 hours before the alert went out and 212 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: 19 J/kg
Mixed-layer CIN: -175 J/kg
Mixed-layer LCL: 1501 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 37 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 
TTAA00 KPIH 232010 COR
FFWPIH
IDC005-240100-
 
SMALL STREAM FLOOD WARNING...CORRECTED
NATIONAL WEATHER SERVICE POCATELLO/IDAHO FALLS ID
200 PM MDT WED JUL 23 1997
 
...SMALL STREAM FLOOD WARNING FOR SOUTHERN BANNOCK COUNTY UNTIL 7
PM...
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SMALL STREAM FLOOD WARNING
FOR SOUTHERN BANNOCK COUNTY UNTIL 7 PM TONIGHT.  THIS INCLUDES THE
COMMUNITIES OF ARIMO...HAWKINS AND ROBIN.  RADAR AND SATELLITE IMAGES
INDICATE MODERATE TO STRONG THUNDERSTORMS WITH HEAVY RAIN IN SOUTHERN
BANNOCK COUNTY.  THESE THUNDERSTORMS WERE MOVING VERY SLOWLY TO THE
NORTH.   
 
STORMS ARE RE-DEVELOPING OVER THE SAME AREAS WHICH WILL CAUSE
SIGNIFICANT WATER RUNOFF.  IN RESPONSE...SMALL STREAMS WILL RISE
R*APIDLY THIS AFTERNOON AS THUNDERSTORMS PERSIST OVER THE SAME AREAS. 
THUNDERSTORMS ARE EXPECTED TO DIMINISH BY EARLY EVENING WITH STREAM
LEVELS DROPPING RAPIDLY.  
 
DSH

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Pocatello, ID wrote its last area forecast discussion before this flash flood warning went out at Jul 23, 8:38 AM MDT, 5 hours 22 minutes earlier.

Area forecast discussion, Jul 23, 8:38 AM MDT, 5 hours 22 minutes before

EASTERN IDAHO AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
835 AM MDT WED JUL 23 1997

SATELLITE LOOPS AND SURFACE OBS INDICATING CLOUDY TO MOSTLY CLOUDY
SKIES OVER MOST OF EASTERN IDAHO THIS MORNING.  KSFX 88D INDICATING
ONLY ISOLATED SHOWERS MAINLY CONFINED TO ZONES 22 AND 23 DESPITE THE
EXTENSIVE CLOUD COVER.  DEFORMATION AXIS CURRENTLY ALONG A WEY-IDA-TWF
LINE.  MODELS ARE ALL CONSISTENT IN MOVING THE AXIS VERY LITTLE DURING
THE DAY TODAY.  MOISTURE CURRENTLY OVER SE ID AND N UT EXPECTED TO
SPLIT BEGINNING TONIGHT AND INTO THURSDAY WITH ONE AREA MOVING INTO NW
NV AND ANOTHER MOVING INTO WY.  LOW LEVEL DRYING WILL NOT COME QUICKLY
AS BROAD UPPER LEVEL TROUGH EXPECTED TO CONTINUE OVER ID.  SCATTERED
CATEGORY POPS FOR TODAY AND THIS EVENING LOOK GOOD.  CANT RULE OUT
ISOLATED STORMS THURSDAY AS WELL.  TEMPERATURES WILL BE COOLER TODAY
ACROSS ZONE 20 AND 21 MAINLY DUE TO CLOUD COVER OTHERWISE TEMPS LOOK
OK.  WILL UPDATE TO ADD MORE CLOUDS OVER ZONES 21 THROUGH 23 AND
CHANGE SOME WORDING.  JEH

IDA BB 086/054 085/052 086 04332
PIH BB 088/059 087/054 087 04332

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 2:50 PM MDT	Severe Thunderstorm Warning	PIH	Madison	45 min
Jul 23, 5:31 PM MDT	Severe Thunderstorm Warning	PIH	Clark	44 min

Nearby

Flash Flood Warnings in Idaho, 1997 Every flash flood warning in 1997

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.