Alert archive / Idaho / Flash Flood Warnings in 1997

Flash Flood Warning 13, NWS Boise, ID

July 29, 1997Owyhee County, Idaho

NWS Boise, ID issued this flash flood warning at Jul 29, 1997, 9:49 PM MDT for Owyhee County, Idaho. It was in force for 56 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, 1997, 9:49 PM MDT (03:49 UTC)
Expired: Jul 29, 1997, 10:45 PM MDT
In force: 56 min
Issued by: NWS Boise, ID
Area: Whole counties

County Owyhee County, ID

The radar

The Boise radar (KCBX), 101 km from the middle of the area, began a volume at 03:52 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, 3.8 hours before the alert went out and 110 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: 554 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 1691 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBOI 300349
FFWBOI
IDC073-300445-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BOISE ID
949 PM MDT TUE JUL 29 1997
 
THE NATIONAL WEATHER SERVICE IN BOISE ID HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 1045 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHWEST IDAHO
 
   ...NORTH CENTRAL OWYHEE COUNTY
 
AT 945 PM MDT RADAR INDICATED THUNDERSTORMS PRODUCING VERY HEAVY RAIN IN
NORTH CENTRAL OWYHEE COUNTY 10 TO 20 MILES SOUTH OF GRANDVIEW OR 30
MILES SOUTHWEST OF MOUNTAIN HOME. RADAR ESTIMATES 1.00 TO 2.00 INCHES OF
RAINFALL DURING THE PAST HOUR ACROSS THIS AREA. FLOODING OF DRY WASHES
AND NEARBY ROADWAYS ARE LIKELY.
 
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.  VEHICLES CAUGHT IN RISING WATER SHOULD BE
ABANDONED QUICKLY.  MOVE 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

Local storm report, Jul 29, 3:55 PM MDT, 5 hours 54 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOISE IDAHO
0716 PM MDT THU JUL 18 1997

TIME(MDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0300 PM    BURNS 40SE                OR   RAIN 1.00 INCH IN 15
07/17/97   HARNEY                         MINUTES. WINDS 32-38 MPH.

0525 PM    PAYETTE                   ID   WIND ESTIMATED 55-72 MPH.
07/17/97   PAYETTE                        TREE BRANCHES BROKEN.
                                          POWER LINES DOWN.

0605 PM    MIDVALE HILL              ID   ROCKS BLOCKING NORTHBOUND
07/17/97   WASHINGTON                     LANE OF HIGHWAY 95

JT/NWSFO BOISE

Local storm report, Jul 29, 4:05 PM MDT, 5 hours 44 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOISE IDAHO
400 PM MDT TUE JUL 29 1997

TIME(MDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0228 PM    ATLANTA                   ID   HEAVY THUNDERSTORM RAIN.
07/29/97   ELMORE                         SOME STREET FLOODING.

0255 PM    GRANDVIEW                 ID   STRONG THUNDERSTORM WINDS.
07/29/97   OWYHEE                         3+ INCH TREE LIMBS BROKEN.

0350 PM    GLENNS FERRY              ID   HEAVY THUNDERSTORM RAINS.
07/29/97   ELMORE                         STREET FLOODING.

0400 PM    WEISER                    ID   .95 IN OF RAIN SINCE 4 AM.
07/29/97   WASHINGTON

NWSFO BOISE

Local storm report, Jul 29, 4:05 PM MDT, 5 hours 44 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOISE IDAHO
400 PM MDT TUE JUL 29 1997

TIME(MDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0228 PM    ATLANTA                   ID   HEAVY THUNDERSTORM RAIN.
07/29/97   ELMORE                         SOME STREET FLOODING.

0255 PM    GRANDVIEW                 ID   STRONG THUNDERSTORM WINDS.
07/29/97   OWYHEE                         3+ INCH TREE LIMBS BROKEN.

0350 PM    GLENNS FERRY              ID   HEAVY THUNDERSTORM RAINS.
07/29/97   ELMORE                         STREET FLOODING.

0400 PM    WEISER                    ID   .95 IN OF RAIN SINCE 4 AM.
07/29/97   WASHINGTON

NWSFO BOISE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 3:17 PM MDT	Flash Flood Warning	BOI	Owyhee	118 min
Jul 30, 3:17 PM MDT	Severe Thunderstorm Warning	BOI	Owyhee	118 min
Jul 30, 4:13 PM MDT	Severe Thunderstorm Warning	BOI	Ada	62 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; radar from the NEXRAD Level II archive.