Alert archive / Arizona / Flash Flood Warnings in 1997

Flash Flood Warning 8, NWS Tucson, AZ

August 1, 1997Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 1, 1997, 4:49 PM MST for Pima County, Arizona. It was in force for 61 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: Aug 1, 1997, 4:49 PM MST (23:49 UTC)
Expired: Aug 1, 1997, 5:50 PM MST
In force: 61 min
Issued by: NWS Tucson, AZ
Area: Whole counties

County Pima County, AZ

The radar

The Tucson radar (KEMX), 112 km from the middle of the area, began a volume at 23:51 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, 11.8 hours before the alert went out and 84 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: 470 J/kg
Mixed-layer CIN: -106 J/kg
Mixed-layer LCL: 2151 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 8 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 KTUS 012350
FFWTUS
AZC019-020050-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
449 PM MST FRI AUG 1 1997

THE NATIONAL WEATHER SERVICE IN TUCSON AZ HAS ISSUED A
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING EFFECTIVE UNTIL 550 PM
MST FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTHERN ARIZONA

   ...EASTERN PIMA COUNTY
 
AT 439 PM MST...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH
EXTREMELY HEAVY RAINFALL 10 MILES SOUTHEAST OF TUCSON OR 5 MILES
NORTHWEST OF VAIL MOVING NORTHWEST AT 10 MPH.  VERY STRONG WIND
GUSTS FROM THIS STORM MAY AFFECT MOTORISTS ON INTERSTATE 10.

THIS STORM WILL AFFECT SOUTHEAST TUCSON BY 515 PM.
 
BRYxANT

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 1:49 PM MST	Severe Thunderstorm Warning	TWC	Cochise	61 min
Aug 1, 3:15 PM MST	Flash Flood Warning	TWC	Cochise	65 min
Aug 1, 4:49 PM MST	Severe Thunderstorm Warning	TWC	Pima	61 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.