Alert archive / Arizona / Flash Flood Warnings in 1998
Flash Flood Warning 31, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Jul 29, 1998, 10:38 PM MST for Cochise County, Arizona. It was in force for 92 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, 1998, 10:38 PM MST (05:38 UTC)
- Expired
- Jul 30, 1998, 12:10 AM MST
- In force
- 92 min
- Issued by
- NWS Tucson, AZ
- Area
- Whole counties
County Cochise County, AZ
The radar
The Tucson radar (KEMX), 83 km from the middle of the area, began a volume at 05:41 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 00:00Z, 5.6 hours before the alert went out and 113 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.
- Mixed-layer CAPE
- 282 J/kg
- Mixed-layer CIN
- -110 J/kg
- Mixed-layer LCL
- 2439 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KTUS 300538 FFWTUS AZC003-300710- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE TUCSON AZ 1038 PM MST WED JUL 29 1998 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * FLASH FLOOD WARNING FOR... WEST CENTRAL COCHISE COUNTY IN SOUTHEASTERN ARIZONA * UNTIL 1210 AM MST * AT 1035 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM WITH VERY HEAVY RAIN ALONG THE EAST SLOPES OF THE DRAGOON MOUNTAINS...WITH VERY LITTLE MOVEMENT. FLASH FLOODING WILL BE LIKELY NEAR THE CAMPGROUNDS SURROUNDING COCHISE STRONGHOLD AND THE TOWN OF PEARCE. OKULSKI OKULSKI
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.
NWS Tucson, AZ wrote its last area forecast discussion before this flash flood warning went out at Jul 29, 9:30 PM MST, 1 hour 8 minutes earlier.
Area forecast discussion, Jul 29, 9:30 PM MST, 1 hour 8 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 930 PM MST WED JUL 29 1998 SYNOPSIS...SOUTHEAST ARIZONA WILL BE ON THE BOUNDARY BETWEEN MOIST AND DRY AIRMASSES TONIGHT THROUGH THURSDAY. THE DRY AIR WILL MOVE INTO THE SOUTHEAST PORTION OF THE STATE FRIDAY AND SATURDAY DECREASING THE THUNDERSTORM THREAT. DISCUSSION...THE MONSOON MOISTURE BOUNDARY HAS BEEN PUSHED EASTWARD THIS EVENING BY A WESTERLY WIND FLOW ALOFT. MOST OF THE RESIDUAL CONVECTIVE ACTIVITY WAS FROM THE GLOBE AREA SOUTHWARD THROUGH GRAHAM AND COCHISE COUNTIES AT 9 PM. THE FEATURE OF INTEREST THIS EVENING WAS A LARGE MESO SCALE CONVECTIVE SYSTEM OVER NORTHERN SONORA. SHOULD SEE OUTFLOW WINDS AND DEBRIS CLOUDS SPREADING INTO SANTA CRUZ AND COCHISE COUNTIES TOWARD MIDNIGHT. MAY EVEN SEE ISOLATED THUNDERSTORMS UNTIL THE EARLY MORNING HOURS NEAR THE MEXICAN BORDER. WILL UPDATE ZONES FOR CURRENT TRENDS IN THE FIRST PERIOD. THE TWO SYNOPTIC SYSTEMS OF INTEREST FOR THURSDAY ARE A SUBTROPICAL UPPER LEVEL LOW PRESSURE SYSTEM SOUTH OF THE BIG BEND AREA OF TEXAS AND A POLAR UPPER TROUGH MOVING INTO THE PACIFIC NORTHWEST. THE SUBTROPICAL SYSTEM CONTINUES TO SPREAD DEEP MONSOONAL MOISTURE JUST TO OUR* SOUTH WHILE THE POLAR TROUGH IS PUSHING DRIER AIR INTO WESTERN ARIZONA. THE DRY AIR SHOULD WIN OUT OVER TIME...BUT HOW QUICKLY? THE MIDNIGHT SHIFT WILL HAVE THE JOB OF SORTING OUT THE DETAILS. TUS 1442. OKULSKI .TWC...NONE
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 5:08 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 47 min |
| Jul 30, 2:59 PM MST | Flash Flood Warning | TWC | Santa Cruz | 2 hr |
| Jul 30, 4:27 PM MST | Flash Flood Warning | TWC | Cochise, Pima | 93 min |
Nearby
Flash Flood Warnings in Arizona, 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; radar from the NEXRAD Level II archive.