Severe Thunderstorm Warning 77, NWS Flagstaff, AZ

Issued

Aug 19, 2001, 6:29 PM MST (01:29 UTC)

Expired

Aug 19, 2001, 7:00 PM MST

In force

31 min

Issued by

NWS Flagstaff, AZ

Area

Whole counties; the outline is the Mesonet’s reconstruction

County Yavapai County, AZ

166 
WUUS55 KFGZ 200132
SVRFLG
AZC025-200200-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
629 PM MST SUN AUG 19 2001

THE NATIONAL WEATHER SERVICE HAS EXTENDED THE

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL YAVAPAI COUNTY IN ARIZONA
  THIS INCLUDES THE CITIES OF...RIMROCK...LAKE MONTEZUMA...          
  MCGUIREVILLE AND CAMP VERDE

* UNTIL 700 PM MST

* AT 629 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A SEVERE THUNDERSTORM OVER RIMROCK WHICH WAS NEARLY STATIONARY.    
  ADDITIONALLY A STRONG GUST FRONT WITH VERY STRONG WINDS IS MOVING  
  WEST ACROSS THIS AREA AND WILL INTERSECT THIS STORM. THEREFORE THE 
  SEVERE THUNDERSTORM WARNING HAS BEEN EXTENDED FOR THIS AREA UNTIL  
  700 PM MST.

* THE SEVERE THUNDERSTORM WILL AFFECT OR PASS CLOSE TO...
RIMROCK...CAMP VERDE...LAKE MONTEZUMA...AND MCGUIREVILLE
INTERSTATE 17 BETWEEN MILEMARKERS 280 AND 295

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE
FOR DAMAGING WINDS IN EXCESS OF 58 MPH...LARGE HAIL...AND DEADLY
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY
INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE.

LAT...LON 3466 11189 3442 11174 3465 11156 3479 11167

NWS Flagstaff, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 19, 2:30 PM MST, 3 hours 59 minutes earlier.

NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
230 PM MST SUN AUG 19 2001

.SYNOPSIS...HIGH PRESSURE CURRENTLY OVER NORTHEAST ARIZONA WILL
CONTINUE TO MOVE EASTWARD TONIGHT. AS A RESULT...SOUTHERLY FLOW
ALOFT WILL BRING AN INCREASE IN MONSOONAL MOISTURE TO THE STATE. AN
UPPER LEVEL DISTURBANCE EMBEDDED IN THE FLOW WILL RESULT IN AN
UPSWING IN SHOWERS AND THUNDERSTORMS AND COOLER DAYTIME TEMPERATURES
TOMORROW. A WESTERLY FLOW ALOFT WILL BRING DRIER AND WARMER WEATHER
TO THE STATE BY THE MIDDLE OF NEXT WEEK.

.DISCUSSION...CONVECTION OFF TO A LATE START TODAY WITH COVERAGE
JUST BECOMING SCATTERED ATTM.  A COUPLE OF SYNOPTIC FEATURES
INDICATE AN UPSWING IN THUNDERSTORM ACTIVITY OVER THE NEXT 24 HOURS.
HIGH PRESSURE OVER NORTHEAST AZ TODAY WILL CONTINUE TO MOVE EASTWARD
TONIGHT. THIS WILL RESULT IN THE LOWER TROPOSPHERIC FLOW BECOMING
MORE SOUTHERLY WITH TIME AND AN INCREASE IN MOISTURE TRANSPORT
ACROSS AZ. THE OTHER FEATURE OF INTEREST IS A WEAK DISTURBANCE
EMBEDDED IN THE FLOW ALONG THE AZ/MEXICO BORDER. MESOETA HAS BEST
HANDLE ON THIS FEATURE AND MOVES IT NORTHWARD INTO SOUTH CENTRAL AZ
TONIGHT AND INTO NORTHERN AZ EARLY TOMORROW. FLOW BECOMES WESTERLY
LATE MONDAY INTO TUESDAY AS A TROF OF LOW PRESSURE MOVES INTO THE
WEST COAST AND BEGINS TO ADVECT DRIER AIR INTO THE STATE. ETA/AVN
SHOWS AN ATTENDANT 50 KT JET WITH THIS TROF WHICH CLIPS THE
NORTHWEST PART OF THE STATE ON TUESDAY. THIS FEATURE BEARS WATCHING
AS ENERGETICS INTERACT WITH RESIDUAL MOISTURE AND SHEAR PROFILE
BECOMES FAVORABLE FOR POSSIBLE SVR WX DAY ON TUESDAY. ETA/AVN THEN
SWEEP THE MOISTURE OUT OF ALL BUT FAR EASTERN AZ ON WEDNESDAY.

IN THE EXTENDED...DRY AIR REMAINS OVER THE FORECAST AREA THROUGH THE
PERIOD. PER CONSENSUS WITH NEARBY OFFICES DURING COORDINATION
CALL...WILL KEEP CHANCE SHOWERS ALONG THE EASTERN AZ/NM BORDER ZONES ON
WEDNESDAY...THEN DRY CONDITIONS/MOSTLY CLEAR FORECAST THROUGH
SUNDAY.  TW

.FGZ...NONE.

Severe Thunderstorm Warnings in Arizona, 2001Every severe thunderstorm warning in 2001

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.