Alert archive / Idaho / Flash Flood Warnings in 1998

Flash Flood Warning 2, NWS Boise, ID

June 11, 1998Gem County, Idaho

NWS Boise, ID issued this flash flood warning at Jun 11, 1998, 6:26 PM MDT for Gem County, Idaho. It was in force for 64 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
Jun 11, 1998, 6:26 PM MDT (00:26 UTC)
Expired
Jun 11, 1998, 7:30 PM MDT
In force
64 min
Issued by
NWS Boise, ID
Area
Whole counties

County Gem County, ID

The nearest sounding before it

Boise Airport, ID (KBOI), launched 00:00Z, 0.4 hours before the alert went out and 57 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 1998-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 340 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Boise Airport, ID at 00:00Z on 1998-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -19 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
340 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
1431 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
-19 m²/s²
0-3 km storm-relative helicity
7 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KBOI 120027
FFWBOI
IDC045-120130-

BULLETIN -- IMMEDIATE BROADCAST REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BOISE ID
626 PM MDT THU JUN 11 1998

THE NATIONAL WEATHER SERVICE IN BOISE HAS ISSUED A

* FLASH FLOOD WARNING FOR:
  WESTERN GEM COUNTY - SOUTHWESTERN IDAHO

* UNTIL 730 PM MDT

* AT 617 PM MDT...BOISE DOPPLER RADAR INDICATED A THUNDERSTORM 5
  MILES WEST OF EMMETT OR 35 MILES NORTHWEST OF BOISE...MOVING
  SOUTHWEST 5 TO 10 MPH..

* VERY HEAVY RAINS CONTINUE TO FALL IN GEM COUNTY WEST OF EMMETT.

* FLASH FLOODING CAN BE EXPECTED IN THE FOLLOWING LOCATIONS:
  ALONG AND NEAR STATE HIGHWAY 52 WEST OF EMMETT


DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE
ROADWAY.  VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED
QUICKLY...MOVE TO HIGHER GROUND.

&

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 12, 1:40 PM MDTFlash Flood WarningBOIOwyhee2 hr
Jun 12, 2:54 PM MDTFlash Flood WarningBOIBoise116 min
Jun 12, 4:49 PM MDTFlash Flood WarningBOIAda, Canyon61 min

Nearby

Flash Flood Warnings in Idaho, 1998Every flash flood warning in 1998

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.