Alert archive / Arizona / Flash Flood Warnings in 2012
Flash Flood Warning 36, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 19, 2012, 8:47 PM MST for Pima County, Pinal County, Arizona. It was in force for 103 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 19, 2012, 8:47 PM MST (03:47 UTC)
- Expired
- Aug 19, 2012, 10:30 PM MST
- In force
- 103 min
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Flood severity
- None
Counties Pima County, AZ, Pinal County, AZ
The radar
The Tucson radar (KEMX), 54 km from the middle of the area, began a volume at 03:49 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 19, 10:19 PM MST | FLASH FLOOD | Se Tucson, AZ | UNDERPASS AT 6TH AND STONE FLOODED AND BARRICADED |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Tuscon, AZ (KDMA), launched 00:00Z, 3.8 hours before the alert went out and 16 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
- 309 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 2678 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -10 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
558 WGUS55 KTWC 200347 FFWTWC AZC019-021-200530- /O.NEW.KTWC.FF.W.0036.120820T0347Z-120820T0530Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE TUCSON AZ 847 PM MST SUN AUG 19 2012 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHEASTERN PIMA COUNTY IN SOUTH CENTRAL ARIZONA... THIS INCLUDES THE CITIES OF...TUCSON...ORO VALLEY...MARANA... EXTREME SOUTHEASTERN PINAL COUNTY IN SOUTH CENTRAL ARIZONA... * UNTIL 1030 PM MST * AT 831 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT VERY HEAVY RAIN HAS FALLEN DURING THE PAST HOUR OR SO. WIDESPREAD REPORTS FROM EITHER AUTOMATED RAIN GAUGES OR TRAINED WEATHER SPOTTERS HAVE RANGED FROM A FEW TENTHS OF AN INCH TO AROUND A HALF INCH. HOWEVER...THERE WERE ALSO MANY REPORTS OF HEAVY RAIN WITH ONE SPOTTER REPORTING 1.35 INCHES OF RAIN IN ABOUT 20 MINUTES AND ANOTHER OF JUST OVER 1 INCH IN 30 MINUTES. SOME OF THE AUTOMATED GAUGES THROUGHOUT PIMA COUNTY ALSO HAVE RECEIVED HEAVY RAIN. FOR EXAMPLE ATOP THE SANTA CATALINAS AT THE PALISADE RANGER STATION THE GAUGE REPORTED 1.54 INCHES IN THE PAST 2 HOURS. THE CITY OF TUCSON REPORTED THAT SEVERAL VEHICLES WERE STUCK IN HIGH WATER IN THE MIDTOWN AREA. NEEDLESS TO SAY...FLASH FLOODING IS LIKELY TO CONTINUE FOR ANOTHER COUPLE OF HOURS EVEN THOUGH THE RAIN IS TAPERING OFF AS THE STORMS MOVE SOUTHWEST AND WEST. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SABINO CANYON...REDINGTON...MOUNT LEMMON/SUMMERHAVEN...DOVE MOUNTAIN... CATALINA STATE PARK...CATALINA FOOTHILLS AND CATALINA. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. && LAT...LON 3250 11124 3252 11046 3199 11046 3208 11109 $$ MOLLERE
2 follow-up statements
837 WGUS75 KTWC 200445 FFSTWC FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE TUCSON AZ 945 PM MST SUN AUG 19 2012 AZC019-021-200530- /O.CON.KTWC.FF.W.0036.000000T0000Z-120820T0530Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ PIMA AZ-PINAL AZ- 945 PM MST SUN AUG 19 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM MST FOR EXTREME SOUTHEASTERN PINAL AND NORTHEASTERN PIMA COUNTIES... AT 936 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE SHOWERS AND THUNDERSTORMS HAVE MOVED WEST TOWARDS THE TOHONO O'ODHAM NATION. EVEN THOUGH THE RAIN HAS MOVED OUT OF THE AREA...RUNOFF FROM THE VERY HEAVY RAIN THAT OCCURED EARLIER THIS EVENING WILL CONTINUE TO RESULT IN RAPIDLY FLOWING WATER IN WASHES ALONG WITH PONDING OF WATER IN LOW LYING AREAS. MOTORISTS SHOULD BE AWARE OF WATER CROSSING ROADWAYS AND NEVER ATTEMPT TO CROSS A ROADWAY COVERED WITH WATER OR TO DRIVE AROUND BARRICADES TO CROSS A WASH. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. && LAT...LON 3250 11124 3252 11046 3199 11046 3208 11109 $$ MOLLERE
793 WGUS75 KTWC 200521 FFSTWC FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE TUCSON AZ 1021 PM MST SUN AUG 19 2012 AZC019-021-200531- /O.EXP.KTWC.FF.W.0036.000000T0000Z-120820T0530Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ PIMA AZ-PINAL AZ- 1021 PM MST SUN AUG 19 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 1030 PM MST FOR EXTREME SOUTHEASTERN PINAL AND NORTHEASTERN PIMA COUNTIES... LAT...LON 3250 11124 3252 11046 3199 11046 3208 11109 $$
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 5:05 PM MST | Areal Flood Advisory | TWC | Cochise | 85 min |
| Aug 19, 5:11 PM MST | Special Weather Statement | TWC | Cochise | 49 min |
| Aug 19, 5:13 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 47 min |
| Aug 19, 5:31 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 59 min |
| Aug 19, 5:59 PM MST | Areal Flood Advisory | TWC | Cochise | 91 min |
| Aug 19, 6:19 PM MST | Areal Flood Advisory | TWC | Graham, Pinal | 86 min |
| Aug 19, 6:37 PM MST | Severe Thunderstorm Warning | TWC | Graham, Pinal | 23 min |
| Aug 19, 7:01 PM MST | Special Weather Statement | TWC | 44 min | |
| Aug 19, 7:11 PM MST | Severe Thunderstorm Warning | TWC | Pima, Pinal | 49 min |
| Aug 19, 7:19 PM MST | Flash Flood Warning | TWC | Pima, Pinal | 86 min |
| Aug 19, 7:56 PM MST | Severe Thunderstorm Warning | TWC | Pima | 49 min |
| Aug 19, 8:58 PM MST | Flash Flood Warning | TWC | Pima | 2 hr |
| Aug 19, 9:25 PM MST | Areal Flood Advisory | TWC | Pima, Pinal | 2 hr |
| Aug 19, 10:56 PM MST | Flash Flood Warning | TWC | Pima | 64 min |
| Aug 20, 4:45 PM MST | Areal Flood Advisory | TWC | Pima, Santa Cruz | 79 min |
Nearby
Flash Flood Warnings in Arizona, 2012Every flash flood warning in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.