Alert archive / Arizona / Flash Flood Warnings in 2011
Flash Flood Warning 48, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 18, 2011, 4:20 PM MST for Pima County, Arizona. It was in force for 85 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 18, 2011, 4:20 PM MST (23:20 UTC)
- Expired
- Aug 18, 2011, 5:45 PM MST
- In force
- 85 min
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County Pima County, AZ
The radar
The Tucson radar (KEMX), 52 km from the middle of the area, began a volume at 23:20 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 18, 5:10 PM MST | FLASH FLOOD | 6 Se Sabino Canyon, AZ | SWIFT WATER RESCUE. ONE MOTORIST IN CAR WITH WATER UP TO ROOF NEAR FORT LOWELL ROAD AND MELPOMENE WAY. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Tuscon, AZ (KTUS), launched 12:00Z, 11.3 hours before the alert went out and 26 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
- 1103 J/kg
- Mixed-layer CIN
- -59 J/kg
- Mixed-layer LCL
- 1836 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 85 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
326 WGUS55 KTWC 182320 FFWTWC AZC019-190045- /O.NEW.KTWC.FF.W.0048.110818T2320Z-110819T0045Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE TUCSON AZ 420 PM MST THU AUG 18 2011 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHEASTERN PIMA COUNTY IN SOUTH CENTRAL ARIZONA... * UNTIL 545 PM MST * AT 412 PM MST...DOPPLER RADAR INDICATED VERY HEAVY RAIN ON THE FAR NORTHEAST SIDE OF TUCSON INCLUDING THE REDINGTON PASS AREA. DOPPLER RADAR ESTIMATED RAINFALL AND NEARBY GAUGES REPORT THAT ONE TO ONE AND A HALF INCHES OF RAIN HAS FALLEN IN THIS AREA IN THE PAST HALF HOUR. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. && LAT...LON 3243 11085 3246 11055 3225 11056 3221 11086 $$
2 follow-up statements
030 WGUS75 KTWC 182351 FFSTWC FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE TUCSON AZ 451 PM MST THU AUG 18 2011 AZC019-190045- /O.CON.KTWC.FF.W.0048.000000T0000Z-110819T0045Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ PIMA AZ- 451 PM MST THU AUG 18 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 PM MST FOR NORTHEASTERN PIMA COUNTY... AT 442 PM MST...MODERATE TO LOCALLY HEAVY RAIN CONTINUES TO FALL OVER NORTHEAST PORTIONS OF THE TUCSON METRO AREA. DOPPLER RADAR INDICATED THAT UP TO ONE AND A HALF INCHES OF RAIN HAD FALLEN IN THE WARNED AREA...WHICH INCLUDES REDINGTON PASS. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS AND OTHER LOW LYING AREAS. && LAT...LON 3243 11085 3246 11055 3225 11056 3221 11086 $$
690 WGUS75 KTWC 190048 FFSTWC FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE TUCSON AZ 548 PM MST THU AUG 18 2011 AZC019-190057- /O.EXP.KTWC.FF.W.0048.000000T0000Z-110819T0045Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ PIMA AZ- 548 PM MST THU AUG 18 2011 ...THE FLASH FLOOD WARNING HAS EXPIRED FOR NORTHEASTERN PIMA COUNTY... PERIODS OF MODERATE RAIN WILL CONTINUE THROUGH 7 PM. A URBAN AND SMALL STREAM FLOOD ADVISORY IS IN EFFECT UNTIL 830 PM FOR ALL OF EASTERN PIMA COUNTY. LAT...LON 3243 11085 3246 11055 3225 11056 3221 11086 $$
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 5:15 PM MST | Flash Flood Warning | TWC | Cochise | 90 min |
| Aug 17, 5:28 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 32 min |
| Aug 18, 11:27 AM MST | Areal Flood Advisory | TWC | Cochise | 78 min |
| Aug 18, 12:34 PM MST | Special Weather Statement | TWC | Graham | 41 min |
| Aug 18, 12:44 PM MST | Special Weather Statement | TWC | Pinal | 46 min |
| Aug 18, 1:03 PM MST | Severe Thunderstorm Warning | TWC | Pinal | 42 min |
| Aug 18, 1:31 PM MST | Severe Thunderstorm Warning | TWC | Cochise, Pima | 44 min |
| Aug 18, 1:34 PM MST | Severe Thunderstorm Warning | TWC | Santa Cruz | 26 min |
| Aug 18, 2:03 PM MST | Severe Thunderstorm Warning | TWC | Santa Cruz | 27 min |
| Aug 18, 2:14 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 46 min |
| Aug 18, 2:15 PM MST | Severe Thunderstorm Warning | TWC | Cochise, Graham | 45 min |
| Aug 18, 2:21 PM MST | Severe Thunderstorm Warning | TWC | Pima | 39 min |
| Aug 18, 3:18 PM MST | Areal Flood Advisory | TWC | Pinal | 3 hr |
| Aug 18, 3:19 PM MST | Areal Flood Advisory | TWC | Pima, Santa Cruz | 116 min |
| Aug 18, 3:29 PM MST | Areal Flood Advisory | TWC | Pima | 2 hr |
| Aug 18, 3:59 PM MST | Severe Thunderstorm Warning | TWC | Pima | 46 min |
| Aug 18, 4:39 PM MST | Flash Flood Warning | TWC | Cochise | 81 min |
Nearby
Flash Flood Warnings in Arizona, 2011Every flash flood warning in 2011
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.