Alert archive / Arizona / Flash Flood Warnings in 2017
Flash Flood Warning 50, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 1, 2017, 5:46 PM MST for Pima County, Arizona. It was in force for 3 hr. 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 1, 2017, 5:46 PM MST (00:46 UTC)
- Expired
- Aug 1, 2017, 8:45 PM MST
- In force
- 3 hr
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County Pima County, AZ
The radar
The Tucson radar (KEMX), 42 km from the middle of the area, began a volume at 00:48 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 1, 6:30 PM MST | FLASH FLOOD | 7 Ne Saguaro National P, AZ | FLASH FLOOD ALONG TANQUE VERDE WASH. THREE PEOPLE TRAPPED AT TANQUE VERDE FALLS AND ARE UNABLE TO CROSS THE WASH TO EXIT THE AREA DUE TO HIGH WATER. TIME IS APPROXIMATE BASED ON SUDDEN INCREASE IN FLOW PER STREAM GAUGE DATA. |
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, 0.8 hours before the alert went out and 25 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
- 144 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 2139 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
680 WGUS55 KTWC 020046 FFWTWC AZC019-020345- /O.NEW.KTWC.FF.W.0050.170802T0046Z-170802T0345Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Tucson AZ 546 PM MST TUE AUG 1 2017 The National Weather Service in Tucson has issued a * Flash Flood Warning for... Eastern Pima County in southeastern Arizona... * Until 845 PM MST * At 545 PM MST, Doppler radar and automated rain gauges indicated thunderstorms producing heavy rain across the warned area. Up to one and a half inches of rain has already fallen. Flash flooding is expected to begin shortly. * Some locations that will experience flooding include... Tucson, Tanque Verde and Catalina Foothills. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. A Flash Flood Warning means that flooding is imminent or occurring. If you are in the warned area move to higher ground immediately. Residents living along streams and creeks should take immediate precautions to protect life and property. && LAT...LON 3230 11056 3220 11056 3222 11083 3233 11082 $$ LEINS
2 follow-up statements
460 WGUS75 KTWC 020139 FFSTWC Flash Flood Statement National Weather Service Tucson AZ 639 PM MST TUE AUG 1 2017 AZC019-020345- /O.CON.KTWC.FF.W.0050.000000T0000Z-170802T0345Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Pima- 639 PM MST TUE AUG 1 2017 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM MST FOR EASTERN PIMA COUNTY... At 636 PM MST, Doppler radar indicated that storms had weakened across the Tucson metro area, but that one and a half inches of rain had fallen in the Tanque Verde basin in less than an hour. Flow has already started on Tanque Verde Creek according to the Tanque Verde Guest Ranch stream gauge. Flash flooding is expected to begin downstream shortly. Normally dry washes and low water crossings may be inundated in the following locations... Tucson, Tanque Verde and Catalina Foothills. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. A Flash Flood Warning means that flooding is imminent or occurring. If you are in the warned area move to higher ground immediately. Residents living along streams and creeks should take immediate precautions to protect life and property. && LAT...LON 3230 11056 3220 11056 3222 11083 3233 11082 $$ LEINS
619 WGUS75 KTWC 020338 FFSTWC Flash Flood Statement National Weather Service Tucson AZ 838 PM MST TUE AUG 1 2017 AZC019-020347- /O.EXP.KTWC.FF.W.0050.000000T0000Z-170802T0345Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Pima- 838 PM MST TUE AUG 1 2017 ...THE FLASH FLOOD WARNING FOR EASTERN PIMA COUNTY WILL EXPIRE AT 845 PM MST... The heavy rain has ended, however Tanque Verde Wash is still running and low water crossings are likely to be inundated for the remainder of the night. Please continue to heed any remaining road closures. LAT...LON 3230 11056 3220 11056 3222 11083 3233 11082 $$ LEINS
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 5:09 PM MST | Flash Flood Warning | TWC | Graham | 2 hr |
| Aug 1, 5:12 PM MST | Areal Flood Advisory | TWC | Pima | 3 hr |
| Aug 1, 5:27 PM MST | Special Weather Statement | TWC | 63 min | |
| Aug 1, 5:47 PM MST | Areal Flood Advisory | TWC | Pinal | 118 min |
| Aug 1, 6:02 PM MST | Flash Flood Warning | TWC | Pinal | 88 min |
| Aug 1, 6:16 PM MST | Flash Flood Warning | TWC | Cochise | 119 min |
| Aug 1, 6:30 PM MST | Areal Flood Advisory | TWC | Pinal | 3 hr |
| Aug 1, 7:28 PM MST | Areal Flood Advisory | TWC | Pima | 3 hr |
| Aug 2, 11:20 AM MST | Special Weather Statement | TWC | 40 min | |
| Aug 2, 11:40 AM MST | Areal Flood Advisory | TWC | Pima | 2 hr |
| Aug 2, 11:51 AM MST | Areal Flood Advisory | TWC | Pima | 114 min |
| Aug 2, 12:08 PM MST | Special Weather Statement | TWC | Santa Cruz | 52 min |
| Aug 2, 12:12 PM MST | Areal Flood Advisory | TWC | Pima | 2 hr |
| Aug 2, 12:27 PM MST | Special Weather Statement | TWC | 48 min | |
| Aug 2, 12:39 PM MST | Areal Flood Advisory | TWC | Pima | 3 hr |
| Aug 2, 1:17 PM MST | Flash Flood Warning | TWC | Pima | 118 min |
| Aug 2, 1:29 PM MST | Special Weather Statement | TWC | Pinal | 46 min |
| Aug 2, 1:32 PM MST | Areal Flood Advisory | TWC | Santa Cruz | 118 min |
| Aug 2, 1:51 PM MST | Areal Flood Advisory | TWC | Pima, Pinal | 3 hr |
| Aug 2, 1:58 PM MST | Severe Thunderstorm Warning | TWC | Pima | 32 min |
| Aug 2, 2:06 PM MST | Areal Flood Advisory | TWC | Cochise | 114 min |
| Aug 2, 2:29 PM MST | Flash Flood Warning | TWC | Pima, Pinal | 3 hr |
| Aug 2, 3:01 PM MST | Special Weather Statement | TWC | 44 min | |
| Aug 2, 3:05 PM MST | Areal Flood Advisory | TWC | Pinal | 3 hr |
| Aug 2, 3:59 PM MST | Severe Thunderstorm Warning | TWC | Pima | 46 min |
| Aug 2, 4:03 PM MST | Special Weather Statement | TWC | Pima | 42 min |
Nearby
Flash Flood Warnings in Arizona, 2017Every flash flood warning in 2017
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.