Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 40, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 25, 2001, 11:15 AM MST for Coconino County, Arizona. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Jul 25, 2001, 11:15 AM MST (18:15 UTC)
- Expired
- Jul 25, 2001, 11:45 AM MST
- In force
- 30 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Coconino County, AZ
The radar
The Flagstaff radar (KFSX), 32 km from the middle of the area, began a volume at 18:18 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
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 6.3 hours before the alert went out and 109 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2086 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- -6 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KFGZ 251816 SVRFLG AZC005-251845- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1115 AM MST WED JUL 25 2001 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EXTREME SOUTHEASTERN COCONINO COUNTY IN ARIZONA * UNTIL 1145 AM MST * AT 1115 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER EXTREME SOUTHEASTERN COCONINO COUNTY...OR ABOUT 18 MILES NORTH OF FOREST LAKES...MOVING NORTHWEST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL AFFECT OR PASS CLOSE TO... RURAL SOUTHEASTERN COCONINO COUNTY AT 1130 AM MST LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A SUBSTANTIAL SHELTER. REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE. LAT...LON 3450 11089 3460 11074 3481 11075 3477 11099 MAS
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 Flagstaff, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 25, 9:15 AM MST, 2 hours earlier.
Area forecast discussion, Jul 25, 9:15 AM MST, 2 hours before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 915 AM MST WED JUL 25 2001 .SYNOPSIS...EXPECT WIDESPREAD SHOWER AND THUNDERSTORM ACTIVITY TODAY AS MOISTURE LEVELS HAVE INCREASED SUBSTANTIALLY OVERNIGHT. SHOWERS AND THUNDERSTORMS WILL CONTINUE OVERNIGHT AND INTO THURSDAY AS MOIST SOUTHERLY FLOW CONTINUES ACROSS THE AREA. A DRIER WESTERLY FLOW WILL DEVELOP BY THE WEEKEND...WITH A CHANCE OF SHOWERS AND THUNDERSTORMS MAINLY OVER THE HIGHER TERRAIN. .DISCUSSION...UPPER LOW OVER SOUTHERN CALIFORNIA WILL SLOWLY MOVE EAST-NORTHEAST THROUGH THURSDAY MORNING. STRONG SOUTHERLY FLOW SET UP THIS MORNING AHEAD OF THE LOW OVER WESTERN ARIZONA. 65KT JET STREAK MOVING AROUND THE LOW COUPLED WITH LOW-LEVEL FLOW BROUGHT A RAPID AND SUBSTANTIAL INCREASE IN MOISTURE TO THE AREA OVERNIGHT. RADAR AND SATELLITE ALREADY QUITE ACTIVE...AND WILL NEED MAJOR UPDATES TO THE ZONES THIS MORNING. EXPECT MAIN TROUBLE AREA TO BE WEST AND NORTHWEST OF THE EASTERN RIM AS THIS AREA IS UNDER MODERATE DYNAMICS ALL DAY. EXPECT ACTIVITY TO CONTINUE OVERNIGHT AND INTO THURSDAY...WITH A SLIGHT EASTWARD SHIFT IN THE MOISTURE BOUNDARY. FIRST PERIOD UPDATES 0ON THE WAY. PETERSON. .FGZ...NONE.
In the hours before
Special weather statement, Jul 25, 9:30 AM MST, 1 hour 45 minutes before
AZZ004>018-037>040-251930- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 930 AM MST WED JUL 25 2001 ...WIDESPREAD SHOWERS AND THUNDERSTORMS TODAY...ESPECIALLY OVER THE CENTRAL PORTIONS OF ARIZONA... DEEP MOISTURE MOVED INTO MUCH OF THE REGION OVERNIGHT AND WILL CONTINUE TO REMAIN IN PLACE INTO EARLY THURSDAY. THIS MOISTURE WILL BRING WIDESPREAD SHOWERS AND THUNDERSTORMS TO MUCH OF THE AREA TODAY. MOST OF THE STRONGER STORMS ARE EXPECTED MAINLY WEST AND NORTHWEST OF THE EASTERN MOGOLLON RIM. THESE STORMS ARE CAPABLE OF PRODUCING VERY HEAVY RAINS AND SOME HAIL. AN UPPER LOW PRESSURE SYSTEM LOCATED JUST SOUTH OF LAS VEGAS WILL BRING SOME COLDER AIR ALOFT TO THE REGION BY THIS AFTERNOON. THIS WILL MEAN THAT THERE IS A POSSIBILITY OF ISOLATED SEVERE THUNDERSTORMS CONTAINING LARGE HAIL. THE MAIN THREAT FOR THIS TYPE OF STORM WILL BE ROUGHLY WEST OF A LINE FROM THE GRAND CANYON TO mHEBER. SPOTTER REPORTS OF EXCESSIVE RAINFALL AMOUNTS AND SEVERE WEATHER SHOULD BE RELAYED TO THE NATIONAL WEATHER SERVICE.
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 4:40 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 35 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 2001Every severe thunderstorm warning in 2001
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.