Alert archive / Idaho / Flash Flood Warnings in 1990

Flash Flood Warning 2, NWS Pocatello, ID

August 16, 19905 counties in Idaho

NWS Pocatello, ID issued this flash flood warning at Aug 16, 1990, 2:22 PM MDT for 5 counties in Idaho. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Aug 16, 1990, 2:22 PM MDT (20:22 UTC)
Expired
Aug 16, 1990, 5:30 PM MDT
In force
3 hr
Issued by
NWS Pocatello, ID
Area
Whole counties

Counties Bingham County, ID, Bonneville County, ID, Jefferson County, ID, Madison County, ID, Teton County, ID

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Lander/Hunt Fiel, WY (KLND), launched 12:00Z, 8.4 hours before the alert went out and 268 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, Lander/Hunt Fiel, WY at 12:00Z on 1990-08-16Temperature 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 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lander/Hunt Fiel, WY at 12:00Z on 1990-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -31 square meters per square second.1939Sfc1 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
2468 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-31 m²/s²
0-3 km storm-relative helicity
7 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 162024 RRA
FFWPIH
IDC023-033-043-051-065-081-005-007-011-019-029-041-071-077-170130-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE POCATELLO ID
222 PM MDT THU AUG 16 1990
 
THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  730 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION... S...
 
IN  IDAHO
 
   ...BUTTE COUNTY...CLARK COUNTY...FREMONT COUNTY...JEFFERSON COUNTY
   ...MADISON COUNTY...TETON COUNTY
 
IN SOUTHEAST IDAHO
 
   ...BANNOCK COUNTY...BEAR LAKE COUNTY...BINGHAM COUNTY
   ...BONNEVILLE COUNTY...CARIBOU COUNTY...FRANKLIN COUNTY...ONIEDA CO
   ...POWER COUNTY
 
...THIS WARNING COVERS ALL OF SOUTHEAST IDAHO EXCEPT FOR LEMHI
COUNTY...
 
A WEATHER SPOTTER IN BANCROFT IDAHO LOCATED NORTHEAST OF LAVA HOT
SPRINGS HAS REPORTED THAT 2 INCHES OF RAIN OCCURRED DURING THE
PASSAGE OF A THUNDERSTORM. THE SHERIFF IN CARIBOU COUNTY REPORTS
THAT HEAVY RAINFALL HAS BEEN OCCURING IN THE COUNTY FOR THE LAST
HOUR OR SO BUT DID NOT HAVE ANY RAINFALL AMOUNTS.
 
THE NATIONAL WEATHER SERVICE REQUESTS THAT REPORTS OF THE STORM
BE CALLED IN COLLECT AT 236-6901.
 
END...WSO JF
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT.  MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.  DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS
THE ROADWAY.  NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT.  TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.

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.

In the hours before

Special weather statement, Aug 16, 1:17 PM MDT, 1 hour 5 minutes before
IDZ003-004-012-170315-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
115 PM MDT THU AUG 16 1990

...THUNDERSTORMS IN SOUTHEAST IDAHO THIS AFTERNOON...

AT 100 PM MDT SEVERAL TYPES OF OBSERVATIONS SHOW THAT THUNDERSTORMS
FORMED IN SOUTHERN SECTIONS OF SOUTHEAST IDAHO FROM THE UTAH BORDER
NORTHWARD TO NEAR IDAHO FALLS. THEY ARE OCCURING FROM MALAD CITY TO
THE EAST OF POCATELLO...BLACKFOOT AND IDAHO FALLS WHICH PLACES MOST
OF THE ACTIVITY IN THE MOUNTAINS OF SOUTHEAST IDAHO.

THE THUNDERSTORMS ARE EXPECTED TO COVER MUCH OF SOUTHEAST IDAHO THIS
AFTERNOON AND THIS EVENING. SOME OF THE THUNDERSTORMS MAY PRODUCE
HEAVY RAIN...NUMEROUS LIGHTNING STRIKES AND GUSTY WINDS TO NEAR 45 MPHPERSONS ENGAGED IN OUTDOOR ACTIVITIES SHOULD BE ALERT FOR THE APPROACH
OF THESE STORMS AND GO TO AN ENCLOSED...STURDY SHELTER.

FURTHER STATEMENTS ABOUT THE PROGRESS OF THE THUNDERSTORMS WILL BE
ISSUED WHEN NECCESSARY. PLEASE RELAY ANY THUNDERSTORM REPORTS TO
YOUR NATIONAL WEATHER SERVICE OFFICE IF POCATELLO...COLLECT AT
236-6901.

WSO..PIH JF

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 2:22 PM MDTFlash Flood WarningPIHBear Lake, Caribou, Franklin3 hr
Aug 16, 2:22 PM MDTFlash Flood WarningPIHBannock, Oneida, Power3 hr
Aug 16, 2:22 PM MDTFlash Flood WarningPIHButte, Clark, Fremont3 hr

Nearby

Flash Flood Warnings in Idaho, 1990Every flash flood warning in 1990

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.