Alert archive / Arizona / Flash Flood Warnings in 1997

Flash Flood Warning 8, NWS Phoenix, AZ

August 26, 1997Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Aug 26, 1997, 1:37 PM MST for Maricopa County, Arizona. It was in force for 2 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: Aug 26, 1997, 1:37 PM MST (20:37 UTC)
Expired: Aug 26, 1997, 3:40 PM MST
In force: 2 hr
Issued by: NWS Phoenix, AZ
Area: Whole counties

County Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 77 km from the middle of the area, began a volume at 20:41 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

Tuscon, AZ (KTUS), launched 12:00Z, 8.6 hours before the alert went out and 198 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: 718 J/kg
Mixed-layer CIN: -165 J/kg
Mixed-layer LCL: 2056 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: -2 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 KPHX 262037
FFWPHX
AZC013-262240-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
137 PM MST TUE AUG 26 1997

*  FLASH FLOOD WARNING FOR
   EAST CENTRAL MARICOPA COUNTY IN CENTRAL ARIZONA

*  UNTIL 340 PM MST

*  SOME LOCATIONS AFFECTED
   SCOTTSDALE
   FOUNTAIN HILLS
   SALT RIVER INDIAN COMMUNITY
 
*  AT 130 PM MST RADAR ESTIMATED RAINFALL RATES OF 1 INCH
   DURING THE PAST HOUR IN SCOTTSDALE. AS A RESULT...
   FLASH FLOODING IS OCCURRING OR IMMINENT IN THE WARNING LOCATIONS.
   THIS WARNING EXTENDS AND EXPANDS THE WARNING ISSUED FOR
   EAST-CENTRAL AND NORTH-CENTRAL MARICOPA COUNTY.
 
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE 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.

The office that day

Everything else NWS Phoenix, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 26, 8:10 AM MST	Severe Thunderstorm Warning	PSR	Maricopa	45 min
Aug 26, 8:54 AM MST	Flash Flood Warning	PSR	Maricopa	66 min
Aug 26, 8:54 AM MST	Severe Thunderstorm Warning	PSR	Maricopa	66 min
Aug 26, 8:55 AM MST	Flash Flood Warning	PSR	Maricopa	65 min
Aug 26, 8:55 AM MST	Severe Thunderstorm Warning	PSR	Maricopa	65 min
Aug 26, 10:18 AM MST	Flash Flood Warning	PSR	Maricopa	3 hr
Aug 26, 1:43 PM MST	Severe Thunderstorm Warning	PSR	Pinal	62 min
Aug 26, 4:15 PM MST	Severe Thunderstorm Warning	PSR	Yuma	55 min

Nearby

Flash Flood Warnings in Arizona, 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.