Alert archive / Arizona / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 30, NWS Tucson, AZ

July 29, 1997Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 29, 1997, 6:57 PM MST for Pima County, Arizona. It was in force for 63 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 29, 1997, 6:57 PM MST (01:57 UTC)
Expired: Jul 29, 1997, 8:00 PM MST
In force: 63 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 01:59 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, 2.0 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 804 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 2497 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 Jul 29, 2:37 PM MST, 4 hours 20 minutes earlier.

Area forecast discussion, Jul 29, 2:37 PM MST, 4 hours 20 minutes before

SOUTHEAST ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TUCSON AZ
230 PM MST TUE JUL 29 1997

SAT SOUNDER CONTINUE TO SHOW MSTR MOVG NORTH ALONG WEST COAST OF
BAJA WITH 1.5 INCH PWATER NINTO WRN PIMA COUNTY. WE ARE STARTING
TO GET ENUF HEATING TO GENERATE STORMS AND IF WE CAN GET A FEW
MORE DEGREES MAY BE RATHER ACTIVE DAY. CI SHIELD HAVE SEEMED TO
DISSIPATED ENUF NOW. STORMS THAT HAVE FORMED ARE MOVG SWD BUT
THINK THAT THIS WILL CHANGE AS WE GET MORE HEAT IN THE VALLEYS
AND DESERT. THIS IS JUST A WATCH AND WAIT SINCE POTENTIAL EXISTS
THINK IT WILL BE MOSTLY CLOUDY OVR ERN ZONES NEXT SEVERAL DAYS
WITH MORE LIKE SHOWERY WEATHER. TUS...AS NORMAL WILL BE ON THE
EDGE.

PROGS KEEP STATUS QUO NEXT FEW DAYS WITH AN UPSWING IN THE
MONSOON. TUS 5444. HOLBROOK

TUS...NONE

The office that day

Everything else NWS Tucson, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 29, 5:32 PM MST	Flash Flood Warning	TWC	Pima	88 min
Jul 29, 6:57 PM MST	Flash Flood Warning	TWC	Pima	63 min

Nearby

Severe Thunderstorm Warnings in Arizona, 1997 Every 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.