Alert archive / Arizona / Flash Flood Warnings in 2012
Flash Flood Warning 17, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Jul 21, 2012, 1:53 PM MST for Pima County, Arizona. It was in force for 112 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 21, 2012, 1:53 PM MST (20:53 UTC)
- Expired
- Jul 21, 2012, 3:45 PM MST
- In force
- 112 min
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County Pima County, AZ
The radar
The Tucson radar (KEMX), 15 km from the middle of the area, began a volume at 20:55 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, 8.9 hours before the alert went out and 28 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
- 444 J/kg
- Mixed-layer CIN
- -130 J/kg
- Mixed-layer LCL
- 1517 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 29 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
221 WGUS55 KTWC 212053 FFWTWC AZC019-212245- /O.NEW.KTWC.FF.W.0017.120721T2053Z-120721T2245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE TUCSON AZ 153 PM MST SAT JUL 21 2012 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * FLASH FLOOD WARNING FOR... EAST CENTRAL PIMA COUNTY IN SOUTH CENTRAL ARIZONA... * UNTIL 345 PM MST * AT 142 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED EXTREMELY HEAVY RAINFALL FROM TWO THUNDERSTORMS EXTENDING FROM NEAR SAHUARITA EASTWARD TO HIGHWAY 83 SOUTH OF TUCSON AND SOUTH OF INTERSTATE 10. MOVEMENT WAS TO THE WEST AND NORTHWEST AT 5 TO 10 MPH. RAINFALL AMOUNTS IN EXCESS OF 2 INCHES ARE POSSIBLE. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CORONA DE TUCSON PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF WASHES AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS. && LAT...LON 3201 11098 3202 11058 3184 11057 3184 11078 $$ MEYER
2 follow-up statements
504 WGUS75 KTWC 212134 FFSTWC FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE TUCSON AZ 234 PM MST SAT JUL 21 2012 AZC019-212245- /O.CON.KTWC.FF.W.0017.000000T0000Z-120721T2245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ PIMA AZ- 234 PM MST SAT JUL 21 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM MST FOR EAST CENTRAL PIMA COUNTY... AT 224 PM MST...SHOWERS WERE WEAKENING SOUTH OF TUCSON IN THE SAHUARITA...CORONA DE TUCSON AND HIGHWAY 83 AREAS. RAINFALL AMOUNTS OF 1 TO 2 INCHES WILL CONTINUE TO CAUSE HEAVY RUNOFF THIS AFTERNOON. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES... CIENEGA CREEK...FORTYNINE WASH AND PANTANO WASH. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. && LAT...LON 3201 11098 3202 11058 3184 11057 3184 11078 $$ MEYER
095 WGUS75 KTWC 212238 FFSTWC FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE TUCSON AZ 338 PM MST SAT JUL 21 2012 AZC019-212247- /O.EXP.KTWC.FF.W.0017.000000T0000Z-120721T2245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ PIMA AZ- 338 PM MST SAT JUL 21 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 345 PM MST FOR EAST CENTRAL PIMA COUNTY... THE SHOWERS AND THUNDERSTORMS THAT BROUGHT HEAVY RAIN TO PORTIONS OF EAST CENTRAL PIMA COUNTY HAVE MOVED WEST. THEREFORE THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE AT 345 PM MST. LAT...LON 3201 11098 3202 11058 3184 11057 3184 11078 $$
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 5:26 PM MST | Areal Flood Advisory | TWC | Pima | 94 min |
| Jul 21, 12:49 PM MST | Special Weather Statement | TWC | Santa Cruz | 41 min |
| Jul 21, 12:56 PM MST | Severe Thunderstorm Warning | TWC | Pima, Santa Cruz | 34 min |
| Jul 21, 1:43 PM MST | Areal Flood Advisory | TWC | Pima, Santa Cruz | 2 hr |
| Jul 21, 2:26 PM MST | Areal Flood Advisory | TWC | Graham | 2 hr |
| Jul 21, 2:27 PM MST | Severe Thunderstorm Warning | TWC | Pima | 33 min |
| Jul 21, 3:01 PM MST | Severe Thunderstorm Warning | TWC | Pima | 44 min |
| Jul 21, 3:05 PM MST | Severe Thunderstorm Warning | TWC | Pima | 40 min |
| Jul 21, 3:25 PM MST | Severe Thunderstorm Warning | TWC | Pinal | 50 min |
| Jul 21, 3:36 PM MST | Severe Thunderstorm Warning | TWC | Graham, Pinal | 39 min |
| Jul 21, 3:38 PM MST | Areal Flood Advisory | TWC | Pima | 58 min |
| Jul 21, 4:07 PM MST | Areal Flood Advisory | TWC | Pinal | 83 min |
| Jul 21, 4:11 PM MST | Areal Flood Advisory | TWC | Pinal | 79 min |
| Jul 21, 4:27 PM MST | Areal Flood Advisory | TWC | Pima, Pinal | 108 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.