Alert archive / Arizona / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 3, NWS Phoenix, AZ

March 7, 1994Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Mar 7, 1994, 3:20 PM MST for Maricopa County, Arizona. It was in force for 65 min.

The area

The counties it named.

The facts

Issued
Mar 7, 1994, 3:20 PM MST (22:20 UTC)
Expired
Mar 7, 1994, 4:25 PM MST
In force
65 min
Issued by
NWS Phoenix, AZ
Area
Whole counties

County Maricopa County, AZ

The nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 10.3 hours before the alert went out and 198 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-pSkew-T log-p diagram, Tuscon, AZ at 12:00Z on 1994-03-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tuscon, AZ at 12:00Z on 1994-03-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 64 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2609 m above ground
0-6 km bulk shear
76 kt
0-1 km storm-relative helicity
64 m²/s²
0-3 km storm-relative helicity
187 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.

In the hours before

Special weather statement, Mar 7, 12:58 PM MST, 2 hours 22 minutes before
AZZALL-080200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
100 PM MST MON MAR 7 1994

...THUNDERSTORMS DEVELOPING JUST WEST OF THE PHOENIX METRO AREA...

AN APPROACHING PACIFIC WEATHER SYSTEM CENTERED JUST OFF THE NORTHWEST
BAJA COAST HAS TRIGGERED SHOWERS AND A FEW THUNDERSTORMS ACROSS MUCH OF
SOUTHERN AND CENTRAL ARIZONA.

A LINE OF SHOWERS AND THUNDERSTORMS HAS DEVELOPED DURING THE PAST HOUR
ABOUT 30 MILES WEST OF THE PHOENIX METROPOLITAN AREA.  DURING THE PAST
45 MINUTES, TWO-THIRDS OF AN INCH OF RAIN HAS FALLEN AT WITTMAN, AND
ONE-QUARTER TO ONE-HALF INCH AMOUNTS HAVE BEEN REPORTED AT SEVERAL OTHER
SITES WEST OF PHOENIX. THIS BAND OF SHOWERS SHOULD MOVE TOWARD THE
NORTHEAST AND AFFECT THE PHOENIX METRO AREA DURING THE NEXT 1-2 HOURS,
BRINGING THE THREAT OF LOCALLY HEAVY RAIN, GUSTY WINDS, SMALL HAIL, AND
INTENSE LIGHTNING.

A 30-MILE WIDE BAND OF LIGHT RAIN SHOWERS EXTENDED FROM TUCSON TO
PAYSON.  INDIVIDUAL SHOWERS WERE MOVING TO THE NORTH AT 25 MILES PER
HOUR, BUT THE RAINBAND WAS NEARLY STATIONARY.  ACROSS THE EAST VALLEY,
RAINFALL AMOUNTS OF THREE TO FOUR TENTHS OF AN INCH HAVE BEEN REPORTED
WITH THIS BAND OF PRECIPITATION.  FOUR TENTHS OF AN INCH HAS FALLEN IN
THE MCDOWELL MOUNTAINS ABOUT 30 MILES NORTH OF PHOENIX, WHILE ABOUT ONE-
THIRD OF AN INCH HAS FALLEN IN THE HUMBOLDT MOUNTAINS NORTH OF CAVE
CREEK AND AT SPOOKHILL PARK IN NORTHEAST MESA.  LIGHT RAIN WILL CONTINUE
WITH THIS BAN:D FOR THE NEXT COUPLE OF HOURS.

GREEN
Special weather statement, Mar 7, 1:00 PM MST, 2 hours 20 minutes before
AZZALL-080200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
100 PM MST MON MAR 7 1994

...THUNDERSTORMS DEVELOPING JUST WEST OF THE PHOENIX METRO AREA...

AN APPROACHING PACIFIC WEATHER SYSTEM CENTERED JUST OFF THE NORTHWEST
BAJA COAST HAS TRIGGERED SHOWERS AND A FEW THUNDERSTORMS ACROSS MUCH OF
SOUTHERN AND CENTRAL ARIZONA.

A LINE OF SHOWERS AND THUNDERSTORMS HAS DEVELOPED DURING THE PAST HOUR
ABOUT 30 MILES WEST OF THE PHOENIX METROPOLITAN AREA.  DURING THE PAST
45 MINUTES, TWO-THIRDS OF AN INCH OF RAIN HAS FALLEN AT WITTMAN, AND
ONE-QUARTER TO ONE-HALF INCH AMOUNTS HAVE BEEN REPORTED AT SEVERAL OTHER
SITES WEST OF PHOENIX. THIS BAND OF SHOWERS SHOULD MOVE TOWARD THE
NORTHEAST AND AFFECT THE PHOENIX METRO AREA DURING THE NEXT 1-2 HOURS,
BRINGING THE THREAT OF LOCALLY HEAVY RAIN, GUSTY WINDS, SMALL HAIL, AND
INTENSE LIGHTNING.

A 30-MILE WIDE BAND OF LIGHT RAIN SHOWERS EXTENDED FROM TUCSON TO
PAYSON.  INDIVIDUAL SHOWERS WERE MOVING TO THE NORTH AT 25 MILES PER
HOUR, BUT THE RAINBAND WAS NEARLY STATIONARY.  ACROSS THE EAST VALLEY,
RAINFALL AMOUNTS OF THREE TO FOUR TENTHS OF AN INCH HAVE BEEN REPORTED
WITH THIS BAND OF PRECIPITATION.  FOUR TENTHS OF AN INCH HAS FALLEN IN
THE MCDOWELL MOUNTAINS ABOUT 30 MILES NORTH OF PHOENIX, WHILE ABOUT ONE-
THIRD OF AN INCH HAS FALLEN IN THE HUMBOLDT MOUNTAINS NORTH OF CAVE
CREEK AND AT SPOOKHILL PARK IN NORTHEAST MESA.  LIGHT RAIN WILL CONTINUE
WITH THIS BAND FOR THE NEXT COUPLE OF HOURS.

GREEN
Special weather statement, Mar 7, 2:39 PM MST, 41 minutes before
AZZ007-080040-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE YUMA AZ
239 PM MST MON MAR 7 1994

...THUNDERSTORMS CONTINUE OVER SOUTHWEST ARIZONA...

AT 215 PM MST, A THUNDERSTORM WAS OBSERVED MOVING INTO THE FOOTHILLS
SECTION OF THE YUMA AREA. OTHER THUNDERSTORMS WERE DEVELOPING IN
NORTHERN YUMA COUNTY. IN ADDITION, LIGHTNING DETECTORS INDICATED
THUNDERSTORM ACTIVITY BETWEEN PARKER AND BOUSE IN NORTHERN LA PAZ
COUNTY. SATELLITE IMAGERY REVEALED THAT ANOTHER AREA OF SHOWERS AND
THUNDERSTORMS WAS LOCATED IN SOUTHEAST CALIFORNIA AND NORTHERN BAJA
CALIFORNIA, WHICH SHOULD MOVE INTO YUMA AND LA PAZ COUNTIES BY THIS
EVENING.

NORTHERN LA PAZ COUNTY RECEIVED FROM 0.50 TO 0.80 INCHES OF RAIN FROM A
PREVIOUS ROUND OF THUNDERSTORMS EARLY THIS MORNING. ADDITIONAL RAINFALL
WILL CAUSE FLOODING OF LOW SPOTS IN AREA ROADS. HOWEVER, THUNDERSTORMS
ANYWHERE IN SOUTHWEST ARIZONA THIS AFTERNOON AND EVENING HAVE THE
POTENTIAL TO PRODUCE LOCALLY HEAVY RAIN, SMALL HAIL, STRONG GUSTY WINDS
AND DEADLY LIGHTNING.

AN UPPER LOW SOUTH OF SAN DIEGO WAS RESPONSIBLE FOR THE THUNDERSTORMS,
AND ITS SLOW EASTWARD MOVEMENT MEANS THAT THIS ACTIVITY WILL PERSIST
WELL INTO THE EVENING HOURS. SHOWERS WILL DECREASE FROM WEST TO EAST BY
MIDNIGHT AS THE LOW DRIFTS EAST.

IF YOU ARE OUTDOORS...MOVE TO A PLACE OF SHELTER IMMEDIATELY IF A
STORM APPROACHES.  MOTORISTS SHOULD REMAIN ALERT FOR REDUCED
VISIBILITIES DURING DOWNPOURS OF RAIN.  STREETS MAY FLOOD QUICKLY.

FAUSETT

N
Special weather statement, Mar 7, 2:40 PM MST, 40 minutes before
AZZ007-080040-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE YUMA AZ
239 PM MST MON MAR 7 1994

...THUNDERSTORMS CONTINUE OVER SOUTHWEST ARIZONA...

AT 215 PM MST, A THUNDERSTORM WAS OBSERVED MOVING INTO THE FOOTHILLS
SECTION OF THE YUMA AREA. OTHER THUNDERSTORMS WERE DEVELOPING IN
NORTHERN YUMA COUNTY. IN ADDITION, LIGHTNING DETECTORS INDICATED
THUNDERSTORM ACTIVITY BETWEEN PARKER AND BOUSE IN NORTHERN LA PAZ
COUNTY. SATELLITE IMAGERY REVEALED THAT ANOTHER AREA OF SHOWERS AND
THUNDERSTORMS WAS LOCATED IN SOUTHEAST CALIFORNIA AND NORTHERN BAJA
CALIFORNIA, WHICH SHOULD MOVE INTO YUMA AND LA PAZ COUNTIES BY THIS
EVENING.

NORTHERN LA PAZ COUNTY RECEIVED FROM 0.50 TO 0.80 INCHES OF RAIN FROM A
PREVIOUS ROUND OF THUNDERSTORMS EARLY THIS MORNING. ADDITIONAL RAINFALL
WILL CAUSE FLOODING OF LOW SPOTS IN AREA ROADS. HOWEVER, THUNDERSTORMS
ANYWHERE IN SOUTHWEST ARIZONA THIS AFTERNOON AND EVENING HAVE THE
POTENTIAL TO PRODUCE LOCALLY HEAVY RAIN, SMALL HAIL, STRONG GUSTY WINDS
AND DEADLY LIGHTNING.

AN UPPER LOW SOUTH OF SAN DIEGO WAS RESPONSIBLE FOR THE THUNDERSTORMS,
AND ITS SLOW EASTWARD MOVEMENT MEANS THAT THIS ACTIVITY WILL PERSIST
WELL INTO THE EVENING HOURS. SHOWERS WILL DECREASE FROM WEST TO EAST BY
MIDNIGHT AS THE LOW DRIFTS EAST.

IF YOU ARE OUTDOORS...MOVE TO A PLACE OF SHELTER IMMEDIATELY IF A
STORM APPROACHES.  MOTORISTS SHOULD REMAIN ALERT FOR REDUCED
VISIBILITIES DURING DOWNPOURS OF RAIN.  STREETS MAY FLOOD QUICKLY.

FAUSETT

N

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 7, 1:46 PM MSTTornado WarningPSRPinal34 min
Mar 7, 2:32 PM MSTSevere Thunderstorm WarningPSRPinal63 min
Mar 7, 3:05 PM MSTFlash Flood WarningPSRLa Paz3 hr
Mar 7, 3:27 PM MSTSevere Thunderstorm WarningPSRPinal63 min
Mar 7, 4:34 PM MSTSevere Thunderstorm WarningPSRPinal46 min

Nearby

Severe Thunderstorm Warnings in Arizona, 1994Every severe thunderstorm warning in 1994

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.