Alert archive / Idaho / Flash Flood Warnings in 1996

Flash Flood Warning 13, NWS Pocatello, ID

July 29, 1996Cassia County, Oneida County, Idaho

NWS Pocatello, ID issued this flash flood warning at Jul 29, 1996, 4:30 PM MDT for Cassia County, Oneida County, Idaho. It was in force for 60 min. 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 29, 1996, 4:30 PM MDT (22:30 UTC)
Expired
Jul 29, 1996, 5:30 PM MDT
In force
60 min
Issued by
NWS Pocatello, ID
Area
Whole counties

Counties Cassia County, ID, Oneida County, ID

The radar

The Pocatello radar (KSFX), 101 km from the middle of the area, began a volume at 22:31 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

Elko, NV (KLKN), launched 12:00Z, 10.5 hours before the alert went out and 179 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, Elko, NV at 12:00Z on 1996-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 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, Elko, NV at 12:00Z on 1996-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 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
2 J/kg
Mixed-layer CIN
-117 J/kg
Mixed-layer LCL
1177 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
93 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 292230
FFWPIH
IDC031-071-292330-
 
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE POCATELLO ID
430 PM MDT MON JUL 29 1996
 
THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
EFFECTIVE UNTIL  530 PM MDT FOR THE FOLLOWING LOCATION...
 
IN SOUTHEAST IDAHO
 
   ...SOUTHEASTERN CASSIA COUNTY...NORTHWESTERN ONEIDA COUNTY
 
AT 425 PM DOPPLER WEATHER RADAR SHOWED A SEVERE THUNDERSTORM WITH
EXTREMELY HEAVY RAIN ALONG AND IMMEDIATELY NORTH OF HIGHWAY 81 IN
SOUTHEAST CASSIA COUNTY. THIS STORM IS MOVING NORTHEAST AT 10 MPH AND
WILL CROSS INTERSTATE 84 ALONG THE ONEIDA COUNTY LINE IN THE SAME AREA
WHERE FLOODING HAS ALREADY BEEN REPORTED. FLASH FLOODING AND DIME-SIZE
HAIL ARE LIKELY ALONG INTERSTATE 84 NEAR THE ONEIDA/CASSIA COUNTY LINE
AND HIGHWAY 81 SOUTH OF BRIDGE.
 
THIS IS A DANGEROUS STORM WITH CONSIDERABLE FLOODING LIKELY. DO NOT
ATTEMPT TO CROSS FLOODED ROADS. IF HEAVY RAIN IS OBSERVED AND YOU ARE
LOCATED IN A LOW LYING AREA OR NORMALLY DRY DRAINAGE...MOVE TO HIGHER
GROUND IMMEDIATELY.
 
END/BAUCK

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 29, 2:14 PM MDT, 2 hours 16 minutes earlier.

Area forecast discussion, Jul 29, 2:14 PM MDT, 2 hours 16 minutes before
AN IMPRESSIVE OUTBREAK OF CONVECTION IN SOUTHEAST IDAHO WITH EXTREMELY
HEAVY PRECIP TOTALS.  OVER  1 INCH IN 15 TO 30 MINUTES BECOMING COMMON
MANY AREAS.  FLASH FLOOD WATCH WELL SUPPORTED BY ACTIVITY.  COORDINATION
WITH BOISE...THEY WILL EXTEND FLASH FLOOD WATCH THROUGH 10 PM.  ALTHOUGH
ACTIVITY HAS BEEN SLOW TO DEVELOP UPPER SNAKE HIGHLANDS...SHEAR AXIS AND
LOCATION OF SHORTWAVE FAVORS SLOW MOVING CELLS WITH LARGE SCALE
DEVELOPMENT THROUGH THIS EVENING.  LATEST WSR-88D SHOWS ACTIVITY
BEGINNING TO BLOSSOM IMMEDIATELY SOUTH OF THIS AREA.  VILS 30+ HAVE BEEN
SUPPORTING NEAR DIME-SIZE HAIL.  LOTS MORE STATEMENTS AND POSSIBLE
WARNINGS TO COME!!!   DRYER AIR OVER CENTRAL NEVADA AND SOUTHWEST IDAHO
WILL WORK INTO AREA LATER TONIGHT AND TUESDAY.  ALTHOUGH RIDGE BUILDS
SLIGHTLY NEXT 48 HOURS...MODELS INDICATE INSTABILITY PERSISTS.  WILL
KEEP ISOLATED TO WIDELY SCATTERED CONVECTION IN ZONES THROUGH PERIOD.
TEMPERATURES WILL WARM AGAIN DUE TO INCREASING SUN AND RIDGE
REESTABLISHING.  BAUCK

PIH BB 055/087 054/092 054 03522
IDA BB 054/085 052/089 053 03622

In the hours before

Special weather statement, Jul 29, 11:29 AM MDT, 5 hours 1 minute before
IDZ003-291815-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
1128 AM MDT MON JUL 29 1996

...STRONG THUNDERSTORMS IN POWER COUNTY...

AT 1015 AM...DOPPLER WEATHER RADAR DETECTED A STRONG THUNDERSTORM
BETWEEN ROCKLAND AND NEELEY.  THIS THUNDERSTORM IS NEARLY STATIONARY AND
HAS THE POTENTIAL TO PRODUCE FLASH FLOODING.  ANOTHER STRONG THUNDERSTOROVER NEELEY IS MOVING TOWARD AMERICAN FALLS AND THE POCATELLO AIRPORT.

IN A FLASHT FLOOD SITUATION...DO NOT ATTEMPT TO CROSS FLOODED ROADWAYS
AND SEEK HIGHER GROUND.  STAY TUNED FOR FURTHER UPDATES.

END/MOLINA
Special weather statement, Jul 29, 12:48 PM MDT, 3 hours 42 minutes before
IDZ003-004-292000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
1240 PM MDT MON JUL 29 1996

...STRONG THUNDERSTORMS ARBON VALLEY...MCCAMMON AND SOUTHERN POCATELLO
AREAS...

AT 1240 PM DOPPLER WEATHER RADAR SHOWED SEVERAL STRONG THUNDERSTORMS IN
EASTERN POWER AND NORTHERN BANNOCK COUNTIES.  THE STRONGEST STORMS
EXTEND FROM INKOM SOUTHWESTWARD ACROSS SCOUT MOUNTAIN TO THE COMMUNITY
OF CRYSTAL.  THESE STORMS ARE MOVING NORTHEAST AT 15 MPH AND WILL
PRODUCE HEAVY RAIN AND PEA-SIZE HAIL.  SOME MINOR FLOODING AND RUNOFF IS
LIKELY WITH THESE STORMS.  TRAVELLERS USING INTERSTATE 15 FROM INKOM TO
MCCAMMON SHOULD BE PREPARED FOR CONSIDERABLE PONDING AND LOCAL LY LOW
VISIBILITIES.

BAUCK
Special weather statement, Jul 29, 1:24 PM MDT, 3 hours 6 minutes before
IDZ004-292015-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
118 PM MDT MON JUL 29 1996

VERY HEAVY RAIN HAS FALLEN ALONG RAPID CREEK NORTH OF INKOM.
DOPPLER RADAR AND LOCAL SPOTTERS REPORT NEARLY ONE INCH OF RAIN IN
FIFTEEN MINUTES BETWEEN 1:00 AND 1:15 PM.  THE STORMS PRODUCING THIS
HEAVY RAIN ARE MOVING VERY SLOWLY EASTWARD AND HAVE THE POTENTIAL
TO PRODUCE LOCAL FLOODING ALONG RAPID CREEK AND EASTWARD INTO THE
UPPER PORTNEUF DRAINAGE IN THE NEXT HOUR.

AS THE STORMS PROGRESS EASTWARD.. LOCALIZED FLOODING MAY OCCUR
ALONG PEBBLE CREEK.. AND OTHER HEADWATER DRAINAGES OF THE UPPER
PORTNUF RIVER INTO EASTERN CARIBOU COUNTY.

PEOPLE TRAVELLING ALONG RAPID CREEK ROAD AND OTHER SECONDARY
ROADS IN NORTHEASTERN BANNOCK AND NORTHWESTERN CARIBOU COUNTIES
SHOULD EXERCISE CAUTION AND BE PREPARED FOR REDUCED VISIBILITY
IN BRIEF HEAVY RAINSHOWERS.. WATER ACROSS ROADWAYS... AND PONDING
OF WATER IN LOW LYING AREAS.

END.l..GOENS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 29, 11:42 AM MDTFlash Flood WarningPIHPower63 min
Jul 29, 1:33 PM MDTFlash Flood WarningPIHOneida, Power57 min
Jul 29, 1:33 PM MDTSevere Thunderstorm WarningPIHOneida, Power57 min
Jul 29, 1:51 PM MDTFlash Flood WarningPIHBannock, Caribou54 min
Jul 29, 1:51 PM MDTSevere Thunderstorm WarningPIHBannock, Caribou54 min
Jul 29, 2:09 PM MDTFlash Flood WarningPIHOneida, Power66 min
Jul 29, 2:09 PM MDTSevere Thunderstorm WarningPIHOneida, Power66 min
Jul 29, 2:47 PM MDTFlash Flood WarningPIHCaribou58 min
Jul 29, 2:47 PM MDTSevere Thunderstorm WarningPIHCaribou58 min
Jul 29, 3:08 PM MDTFlash Flood WarningPIHOneida52 min
Jul 29, 3:08 PM MDTSevere Thunderstorm WarningPIHOneida52 min
Jul 29, 3:49 PM MDTFlash Flood WarningPIHCassia41 min
Jul 29, 3:49 PM MDTSevere Thunderstorm WarningPIHCassia41 min
Jul 29, 4:30 PM MDTSevere Thunderstorm WarningPIHCassia, Oneida60 min
Jul 29, 4:37 PM MDTSevere Thunderstorm WarningPIHBonneville, Jefferson68 min
Jul 29, 5:33 PM MDTSevere Thunderstorm WarningPIHBingham57 min
Jul 29, 5:50 PM MDTSevere Thunderstorm WarningPIHBannock40 min

Nearby

Flash Flood Warnings in Idaho, 1996Every flash flood warning in 1996

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.