Alert archive / Arizona / Flash Flood Warnings in 1996
Flash Flood Warning 37, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Jul 27, 1996, 4:22 PM MST for Pima County, Arizona. It was in force for 68 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
- Jul 27, 1996, 4:22 PM MST (23:22 UTC)
- Expired
- Jul 27, 1996, 5:30 PM MST
- In force
- 68 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 23:26 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
- 194 J/kg
- Mixed-layer CIN
- -226 J/kg
- Mixed-layer LCL
- 2290 m above ground
- 0-6 km bulk shear
- 3 kt
- 0-1 km storm-relative helicity
- -24 m²/s²
- 0-3 km storm-relative helicity
- 13 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 272322 FFWTUS AZC019-280030- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM AND FLASH FLOOD WARNING NATIONAL WEATHER SERVICE TUCSON ARIZONA 422 PM MST SAT JUL 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 ...CENTRAL PIMA COUNTY AT 418 PM TUCSON DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS WITH EXTREMELY HEAVY RAINFALL MOVING THROUGH CENTRAL PIMA COUNTY AND THE TOHONO OODHAM NATION. SEVERE STORMS WERE NOTED IN AN AREA FROM 5 TO 25 MILES NORTH OF SELLS...MOVING WESTWARD AT 15 TO 20 MPH. THE TOWN OF GU ACHI CAN EXPECT WINDS NBEAR 65 MPH...TORRENTIAL RAIN...DAMAGING HAIL AND FREQUENT LIGHTNING BY 445 PM. MEYER
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 Jul 27, 9:23 AM MST, 6 hours 59 minutes earlier.
Area forecast discussion, Jul 27, 9:23 AM MST, 6 hours 59 minutes before
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
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 12:49 PM MST | Severe Thunderstorm Warning | TWC | Santa Cruz | 56 min |
| Jul 27, 1:54 PM MST | Severe Thunderstorm Warning | TWC | Pima | 66 min |
| Jul 27, 2:19 PM MST | Flash Flood Warning | TWC | Pima | 56 min |
| Jul 27, 2:19 PM MST | Severe Thunderstorm Warning | TWC | Pima | 56 min |
| Jul 27, 3:15 PM MST | Flash Flood Warning | TWC | Pima | 60 min |
| Jul 27, 3:15 PM MST | Severe Thunderstorm Warning | TWC | Pima | 60 min |
| Jul 27, 4:22 PM MST | Severe Thunderstorm Warning | TWC | Pima | 68 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.