Alert archive / Arizona / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 109, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Sep 21, 1997, 2:08 AM MST for Pima County, Arizona. It was in force for 42 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
- Sep 21, 1997, 2:08 AM MST (09:08 UTC)
- Expired
- Sep 21, 1997, 2:50 AM MST
- In force
- 42 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 09:10 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 00:00Z, 9.1 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
- 278 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 3126 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 90 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KTUS 210910 RRA SVRTUS AZC019-210950- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TUCSON AZ 208 AM MST SUN SEP 21 1997 THE NATIONAL WEATHER SERVICE IN TUCSON AZ HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 250 AM MST FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHERN ARIZONA ...EASTERN PIMA COUNTY INCLUDING THE TUCSON METRO AREA... ...AT 207 PM TUCSON DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVE"R SOUTHWEST TUCSON JUST WEST OF THE TUCSON INTERNATIONAL AIRPORT. THIS THUNDERSTORM IS MOVING NORTHEAST AT 20 MPH.
What forecasters said that day
The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Sep 20, 9:16 PM MST, 4 hours 52 minutes earlier.
Area forecast discussion, Sep 20, 9:16 PM MST, 4 hours 52 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 915 PM MST SAT SEP 20 1997 SCATTERED SHOWERS AND THUNDERSTORMS WERE MAINLY CONFINED TO E OF TUCSON THIS AFTERNOON AND EVENING WHERE THE DEEPEST SUBTROPICAL MOISTURE AND DYNAMICS ARE AT. LOW-LEVEL CONVERGENCE..DUE TO BACK-DOOR COLD FRONT..COMBINED WITH POSSIBLE JET STREAK AT 300 MB FOR ACTIVITY OCCURRING E OF TUCSON. HAVE SEEN SOME TRAINING OF THUNDERSTORMS WITH SOME LOCALLY HEAVY SHOWERS. MAY SEE ACTION CONTINUING OVERNIGHT E OF TUCSON WHICH CURRENT FCSTS HANDLE. UPDATED ZONES EARLIER TO TAKE OUT MENTION OF THUNDERSTORMS FROM TUCSON WEST. MAY SEE SOME GUSTY BREEZES TO 20 MPH SUNDAY MORNING AS GRADIENT TIGHTENS AS SFC HIGH CONTINUE TO BUILD SOUTH ACROSS NEW MEXICO. THIS NOT SHOWN IN CURRENT FORECAST AND WILL LEAVE THIS UP TO MID-SHIFT TO PONDER. LATEST GUIDANCE TAKES NORA TO CABO SAN LUCAS SOMETIME TUESDAY. QUICK LOOK AT 00Z ETA/NGM 48 HR SFC PANELS SHOWS THAT ETA FAIRLY SIMILIAR TO POSITION OF NORA MONDAY AFTERNOON WHILE NGM HAS NO CLUE. STILL A WAIT AND SEE ATTITUDE IF NORA WILL AFFECT CWA THE MIDDLE OF NEXT WEEK. TUS 0332. GLUECK TUS...NONE
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 21, 4:03 AM MST | Severe Thunderstorm Warning | TWC | Pima, Pinal | 67 min |
| Sep 21, 4:39 AM MST | Severe Thunderstorm Warning | TWC | Graham | 61 min |
| Sep 21, 7:35 AM MST | Severe Thunderstorm Warning | TWC | Cochise, Pima | 30 min |
| Sep 21, 12:56 PM MST | Flash Flood Warning | TWC | Cochise | 94 min |
| Sep 21, 12:56 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 94 min |
| Sep 21, 2:16 PM MST | Flash Flood Warning | TWC | Cochise | 64 min |
| Sep 21, 2:16 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 64 min |
| Sep 21, 2:28 PM MST | Flash Flood Warning | TWC | Cochise, Graham | 62 min |
| Sep 21, 2:28 PM MST | Severe Thunderstorm Warning | TWC | Cochise, Graham | 62 min |
| Sep 21, 3:33 PM MST | Flash Flood Warning | TWC | Cochise | 62 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 1997Every severe thunderstorm warning in 1997
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.