Alert archive / Arizona / Flash Flood Warnings in 1999
Flash Flood Warning 39, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 27, 1999, 12:40 PM MST for Pima County, Arizona. It was in force for 100 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 27, 1999, 12:40 PM MST (19:40 UTC)
- Expired
- Aug 27, 1999, 2:20 PM MST
- In force
- 100 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 19:42 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, 7.7 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.
- Mixed-layer CAPE
- 672 J/kg
- Mixed-layer CIN
- -86 J/kg
- Mixed-layer LCL
- 1305 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 38 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 271941 FFWTUS AZC019-272120- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE TUCSON AZ 1240 PM MST FRI AUG 27 1999 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHEASTERN PIMA COUNTY IN SOUTHERN ARIZONA INCLUDING ORO VALLEY AND CATALINA STATE PARK * UNTIL 220 PM MST * AT 1240 PM... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM WITH VERY HEAVY RAIN 2 MILES EAST OF ORO VALLEY... NEARLY STATIONARY. * EXPECT RAINFALL AMOUNTS IN EXCESS OF 2 INCHES WITH THIS STORM. REDEVELOPMENT IS POSSIBLE IN THIS AREA INTO THE EARLY AFTERNOON. A FLASH FLOOD WARNING MEANS FLOODING IS IMMINENT. WJM
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 Aug 27, 9:15 AM MST, 3 hours 25 minutes earlier.
Area forecast discussion, Aug 27, 9:15 AM MST, 3 hours 25 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 915 AM MST FRI AUG 27 1999 SYNOPSIS...EAST TO SOUTHEST WINDS ALOFT OVER SOUTHERN ARIZONA HAS BROUGHT PLENTY OF MOISTURE TO FEED THUNDERSTORMS. EARLY MORNING THUNDERSTORMS WEST OF TUCSON HAVE WEAKENED BY MID MORNING BUT WILL LIKELY DEVELOP AGAIN DURING THE AFTERNOON HOURS. LOW LEVEL WINDS WILL REMAIN LIGHT THROUGH THE WEEKEND FOR A CONTINUED THUNDERSTORM THREAT EACH AFTERNOON AND EVENING. DISCUSSION...COPIOUS MOISTURE IN SOUTHERN ARIZONA THIS MORNING. 1.8 INCH PRECIPITABLE WATER IN TUCSON WITH ABOUT THE SAME THROUGH THE LOW DESERT TO THE WEST. SPECIAL 18Z TUCSON SOUNDING TODAY SHOULD HELP TO SHOW HOW MUCH OF THIS MOISTURE REMAINS WITH THE MORNING THUNDERSTORM COMPLEX NOW WEST OF TUCSON. ALSO...MODELS SHOW SOME WARMING ALOFT ON OUR DOORSTEP TO OUR EAST. HOPEFULLY 18Z SOUNDING WILL SHOW IF THE AIRMASS IS WARMING ALOFT. AND FINALLY...MID LEVEL WINDS THIS MORNING WERE PUSHING THE STORMS WEST NORTHWEST AT A GOOD CLIP. MODELS INDICAT WINDS WILL WEAKEN THUS SLOWING THE STORM MOTION AND ALLOWING HEAVY RAIN FROM STORMS THAT DEVELOP. CLOUD COVER OVER SOUTHERN ARIZONA SLOWING THE WARMING THIS MORNING. REMAINS OF BRET EVIDENT IN THE COPIOUS MOISTURE AND ALSO IN THE INVERTED TROF NOW OVER SOUTHEAST ARIZONA. ALL THIS SHOULD CONTINUE ITS SLOW NORTHWEST MOVEMENT NEXT 24 HOURS. THINK BEST THREAT FOR REALLY ACTIVE WEATHER TODAY IS WESTERN SECTIONS. OF COURSE THIS THINKING MAY CHANGE WITH RECEIPT OF 18Z SOUNDING LATER THIS MORNING. PRF .TWC...NONE.
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 5:14 PM MST | Severe Thunderstorm Warning | TWC | Pima | 31 min |
| Aug 26, 7:21 PM MST | Severe Thunderstorm Warning | TWC | Pima, Santa Cruz | 49 min |
| Aug 26, 8:08 PM MST | Severe Thunderstorm Warning | TWC | Santa Cruz | 32 min |
| Aug 26, 8:49 PM MST | Flash Flood Warning | TWC | Pima | 101 min |
| Aug 27, 1:11 PM MST | Severe Thunderstorm Warning | TWC | Pima | 44 min |
| Aug 27, 1:15 PM MST | Flash Flood Warning | TWC | Pima | 60 min |
| Aug 27, 1:55 PM MST | Severe Thunderstorm Warning | TWC | Pima | 65 min |
| Aug 27, 3:00 PM MST | Severe Thunderstorm Warning | TWC | Pima, Pinal | 45 min |
| Aug 27, 3:50 PM MST | Severe Thunderstorm Warning | TWC | Pinal | 45 min |
Nearby
Flash Flood Warnings in Arizona, 1999Every flash flood warning in 1999
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.