Alert archive / Arizona / Flash Flood Warnings in 1996
Flash Flood Warning 68, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 27, 1996, 4:21 PM MST for Pima County, Arizona. It was in force for 69 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, 1996, 4:21 PM MST (23:21 UTC)
- Expired
- Aug 27, 1996, 5:30 PM MST
- In force
- 69 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 23:23 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, 11.4 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
- 415 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 1407 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- -2 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 272320 FFWTUS AZC019-280030- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM AND FLASH FLOOD WARNING NATIONAL WEATHER SERVICE TUCSON ARIZONA 421 PM MST TUE AUG 27 1996 THE NATIONAL WEATHER SERVICE IN TUCSON ARIZONA HAS ISSUED A SEVERE THUNDERSTORM AND FLASH FLOOD WARNING EFFECTIVE UNTIL 530 PM MST FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTH CENTRAL ARIZONA ...WEST CENTRAL PIMA COUNTY AT 418 PM TUCSON DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM ABOUT 22 MILES WEST OF SELLS AND 7 MILES SOUTH OF HIGHWAY 86. THIS STORM WAS ALSO PRODUCING VERY HEAVY RAINFALL WITH RADAR ESTIMATES OF 2.5 INCHES DURING THE PAST HOUR. A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHfER GROUND. COLLINS
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, 2:21 PM MST, 2 hours earlier.
Area forecast discussion, Aug 27, 2:21 PM MST, 2 hours before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 220 PM MST TUE AUG 27 1996 LOOKS LIKE AN ACTIVE DAY HERE IN THE SE. PLENTY OF LOW-LEVEL MSTR IN PLACE AS GULF SURGE CONTINUES. PW VALUES OF 1.5 IN. ON SPECIAL 18Z SOUNDING AND DEW POINTS HOLDING IN THE MID 60S EARLY THIS AFTN. EXPECT WIDESPREAD ACTIVITY THIS AFTN AND EVE OVER CWA. OTHER ORGANIZED STORMS PROPAGATING SOUTH AND WEST OFF THE RIM MAY MOVE OVER EASTERN PART OF CWA LATE THIS AFTN THEN INTO WESTERN PART OF CWA TONIGHT. MODIFIED MEAN CAPE OF ABOUT 1700 J/KG... LI OF -7...AND DRY AIR IN UPPER LEVELS...SO SVR WX DEFINITELY A POSSIBILITY. BROAD UPPER HIGH NOW IN PLACE AT H5 WILL BECOME MORE ORGANIZED OVER 4 CORNERS THE NEXT COUPLE DAYS WITH H5 FLOW BECOMING MORE EASTERLY. MODELS SHOW 70-90 PERCENT RH AT H7 FOR WED AND THU SO IT LOOKS LIKE LACK OF MSTR WILL NOT BE A PROBLEM. WIDESPREAD ACTIVITY TODAY HOWEVER COULD RESULT IN JUST WIDELY SCATTERED WED IF LOWER ATMOSPHERE STABILIZES ENOUGH...WITH POSSIBLY A MORE ACTIVE DAY ON THURSDAY. BUT WILL LEAVE POPS AS THEY ARE BASED ON AMOUNT OF MOISTURE. TUS 4333. T/SCHOWENGERDT
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 4:00 PM MST | Severe Thunderstorm Warning | TWC | Pima | 45 min |
| Aug 27, 4:21 PM MST | Severe Thunderstorm Warning | TWC | Pima | 69 min |
| Aug 27, 4:30 PM MST | Flash Flood Warning | TWC | Pima | 75 min |
| Aug 27, 4:30 PM MST | Severe Thunderstorm Warning | TWC | Pima | 75 min |
| Aug 27, 4:46 PM MST | Flash Flood Warning | TWC | Pima | 74 min |
Nearby
Flash Flood Warnings in Arizona, 1996Every flash flood warning in 1996
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.