Alert archive / Arizona / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 20, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Jun 12, 1997, 11:24 AM MST for Pinal County, Arizona. It was in force for 51 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
- Jun 12, 1997, 11:24 AM MST (18:24 UTC)
- Expired
- Jun 12, 1997, 12:15 PM MST
- In force
- 51 min
- Issued by
- NWS Tucson, AZ
- Area
- Whole counties
County Pinal County, AZ
The radar
The Phoenix radar (KIWA), 52 km from the middle of the area, began a volume at 18:25 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, 6.4 hours before the alert went out and 92 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
- 750 J/kg
- Mixed-layer CIN
- -51 J/kg
- Mixed-layer LCL
- 1789 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KTUS 121825 RRA SVRTUS AZC021-121915- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TUCSON AZ 1124 AM MST THU JUN 12 1997 THE NATIONAL WEATHER SERVICE IN TUCSON AZ HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1215 PM MST FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTH CENTRAL ARIZONA ...EASTERN PINAL COUNTY AT 1124 AM MST...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 8 MILES WEST OF MAMOTH...MOV`ING TO THE EAST NORTHEAST AT 15 MPH. EXPECT STRONG GUSTY WIND INXCESS OF 50 MPH AND LARGE HAIL.
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 Jun 12, 9:00 AM MST, 2 hours 24 minutes earlier.
Area forecast discussion, Jun 12, 9:00 AM MST, 2 hours 24 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 900 AM MST THU JUN 12 1997 SURPRISE TSRA IN TUS THIS MORNING. HAD REPORTS OF .5 INCH HAIL. LOW LEVEL MOISTURE FROM MEXICO ADVECTED INTO THE AREA MUCH FASTER THAN ANTICIPATED. GYM SOUNDING SHOWED 10-15 KT SLY WINDS LAST 2 DAYS. SURFACE DEW PTS IN THE MID 40S-50S. 88D ECHOS AT THIS TIME MAINLY N AND E PORTIONS OF CWA...AND MOVING RAPIDLY NEWD. THIS MORNINGS PLOT FILES SHOW SPEED MAX AT 300 MB ACROSS SRN AZ WITH TROUGH OVER WRN AZ. WITH THIS MUCH LOW LEVEL MOISTURE AND WEAK DYNAMICAL FORCING SHOULD SEE SCATTERED TSTMS THIS AFTERNOON. TUS 432 TUS...NONE
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 12:17 PM MST | Severe Thunderstorm Warning | TWC | Pinal | 58 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.