Alert archive / Texas / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 177, NWS Amarillo, TX
NWS Amarillo, TX issued this severe thunderstorm warning at Sep 17, 2001, 5:43 PM CDT for Dallam County, Texas. It was in force for 62 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
- Sep 17, 2001, 5:43 PM CDT (22:43 UTC)
- Expired
- Sep 17, 2001, 6:45 PM CDT
- In force
- 62 min
- Issued by
- NWS Amarillo, TX
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Dallam County, TX
The radar
The Amarillo radar (KAMA), 137 km from the middle of the area, began a volume at 22:53 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
Amarillo Airport, TX (KAMA), launched 12:00Z, 10.7 hours before the alert went out and 138 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
- 8 J/kg
- Mixed-layer CIN
- -243 J/kg
- Mixed-layer LCL
- 1781 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- -4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
752 WUUS54 KAMA 172243 SVRAMA TXC111-172345- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE AMARILLO TX 543 PM CDT MON SEP 17 2001 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN DALLAM COUNTY IN TEXAS * UNTIL 645 PM CDT * AT 543 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 18 MILES NORTHWEST OF CONLEN...OR ABOUT 20 MILES NORTH OF DALHART...MOVING SOUTHEAST AT 20 MPH. * SOME LOCATIONS AFFECTED BY THE STORM INCLUDE... CONLEN...KERRICK AND CHAMBERLIN LARGE HAIL...DAMAGING WINDS...AND TORRENTIAL RAINS ARE EXPECTED WITH THIS STORM. TAKE COVER IN A SUBSTANTIAL SHELTER. LAT...LON 3648 10260 3608 10261 3607 10219 3648 10218
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 Amarillo, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 17, 4:45 PM CDT, 58 minutes earlier.
Area forecast discussion, Sep 17, 4:45 PM CDT, 58 minutes before
TEXAS/OKLAHOMA PANHANDLES FORECAST DISCUSSION NATIONAL WEATHER SERVICE AMARILLO TX 445 PM CDT MON SEP 17 2001 MODERATELY STRONG SHORTWAVE BEGINNING TO MOVE ACROSS THE CENTRAL ROCKIES THIS AFTERNOON PER LATEST WV/IR IMAGERY. AT THE SURFACE... STATIONARY FRONT WAS STRETCHED FROM NORTHERN KANSAS WESTWARD INTO EAST CENTRAL COLORADO...WITH MESO-LOW LOCATED IN SOUTHWESTERN KANSAS. CONVECTION INCREASING ALONG AND TO THE NORTH OF STATIONARY FRONT AS WELL AS THE HIGHER TERRAIN ALONG THE EASTERN SLOPES OF COLORADO AND NORTHEASTERN NEW MEXICO. EXPECT STATIONARY FRONT TO BEGIN MOVING SOUTH...PARTIALLY MASKED BY CONVECTIVE OUTFLOW...LATE THIS AFTERNOON...ENTERING THE OKLAHOMA PANHANDLE DURING THE EARLY EVENING. SHORT RANGE MODELS...AVN AND MORE SO NGM...APPEAR TOO SLOW AND TOO FAR NORTH WITH THE FRONT. ETA SEEMS A BIT MORE REALISTIC... HOWEVER...THIS IS BECAUSE IT MAY BE TOO FAST WITH THE SHORTWAVE. THEREFORE...MUCH OF PACKAGE IS BASED UPON A MESHING OF THE AVN/S MID AND UPPER LEVEL FEATURES...AND THE ETA/S LOW-LEVEL FEATURES. STEEP LAPSE RATES...STRONG DAYTIME INSOLATION...AND INCREASING SPEED/DIRECTIONAL SHEAR HAS CREATED VERY FAVORABLE CONDITIONS FOR SEVERE TSRA...WITH MAIN THREAT BEING LARGE HAIL AND DAMAGING DOWNBURST WINDS. EARLY ISOLATED CELLS MIGHT PRODUCE A TORNADO...BUT AS THE EVENING PROGRESSES...CONVECTION LIKELY TO MERGE INTO LARGE CLUSTERS...EVENTUALLY EVOLVING INTO MCS. THIS WILL CREATE CONDITIONS FAVORABLE FOR LOCALLY HEAVY RAINFALL AND WILL BE MENTIONED IN A UPCOMING UPDATE TO FORECAST. SFC FRONT WILL SHIFT EAST TONIGHT AND ALLOW COLD FRONT TO PUSH SOUTH ACROSS THE REMAINDER OF THE CWFA. COOLER TEMPS FOR TUESDAY AND TUESDAY NIGHT DUE TO /SLIGHTLY/ DRIER AIRMASS AND WEAK UPSLOPE LOW-LEVEL FLOW. DESPITE DIMINISHING SYNOPTIC SCALE LIFT FROM EXITING SHORTWAVE...WILL RETAIN CHANCE POPS FOR TUESDAY AND TUESDAY NIGHT AS AFTERNOON CONVECTIVE SNACKS SEEM TO SOMEHOW EMERGE ACROSS THE HIGHER TERRAIN UNDER WEST TO NORTHWEST FLOW ALOFT AND UPSLOPE FLOW NEAR THE SURFACE. PRECIPITATION CHANCES LOOK TO WANE THROUGH THURSDAY WITH NORTHWEST FLOW ALOFT WEAKENING AND LOW LEVEL FOCUSING MECHANISMS APPARENTLY ABSENT. WEAK SHORTWAVE MAY PASS TO THE NORTH OF THE AREA FRIDAY AND FRIDAY NIGHT...PULLING ANOTHER FRONT SOUTH ACROSS THE AREA...SO DECIDED TO RETAIN LOW POPS THEN. LOW CONFIDENCE FOR PRECIPITATION POTENTIAL SUNDAY AND MONDAY AS MEDIUM RANGE MODELS ARE TRENDING TOWARD UPPER LEVEL RIDGING. THEREFORE...WILL KEEP DRY AND WARM FOR NOW. .AMA... TX...NONE. OK...NONE. JH
In the hours before
Special weather statement, Sep 17, 12:55 PM CDT, 4 hours 48 minutes before
OKZ001>003-TXZ001>020-172100- TEXAS/OKLAHOMA PANHANDLES THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE AMARILLO TX 1255 PM CDT MON SEP 17 2001 THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE ENTIRE TEXAS AND OKLAHOMA PANHANDLES THROUGH TONIGHT. WARM...MOIST...UNSTABLE AIR WILL BE FOUND ACROSS THE PANHANDLES THIS AFTERNOON. A SURFACE TROUGH ACROSS EASTERN NEW MEXICO WILL MOVE EAST INTO THE WESTERN PANHANDLES BY MID AFTERNOON. A COLD FRONT WILL MOVE ACROSS THE PANHANDLES TONIGHT. THE WARM...MOIST AND UNSTABLE AIRMASS WILL BE LIFTED BY THESE SURFACE BOUNDARIES AND AN UPPER LEVEL DISTURBANCE WILL MOVE FROM THE ROCKIES INTO THE PANHANDLES TO PROVIDE A TRIGGER FOR THUNDERSTORM DEVELOPMENT. THUNDERSTORMS ARE EXPECTED TO DEVELOP IN SOUTHEAST COLORADO OR NORTHEAST NEW MEXICO BY MID AFTERNOON. THESE STORMS ARE THEN EXPECTED TO MOVE EAST INTO PANHANDLES. THE UNSTABLE AIR ALONG WITH THE UPPER LEVEL ENERGY WILL PROVIDE THE STAGE FOR STRONG TO SEVERE THUNDERSTORM DEVELOPMENT THROUGH TONIGHT. THE MAIN THREATS FROM THE STORMS WILL BE LARGE HAIL AND VERY HEAVY RAIN. HEAVY RAIN HAS ALREADY FALLEN ACROSS PARTS OF THE WESTERN AND CENTRAL TEXAS PANHANDLE AND THE CENTRAL OKLAHOMA PANHANDLE OVER THE LAST COUPLE OF DAYS. MORE HEAVY RAIN WILL ONLY AGGRAVATE THE FLASH FLOOD POTENTIAL. ISOLATED SUPERCELLS WITH TORNADOES WILL ALSO NOT BE OUT OF THE QUESTION AS THE WIND PROFILE ALOFT BECOMES MORE FAVORABLE THIS AFTERNOON. SPOTTERS AND EMERGENCY MANAGEMENT OFFICIALS SHOULD REMAIN ALERT FOR POSSIBLE ACTIVATION THIS AFTERNOON OR EVENING. GOEHRING
Nearby
Severe Thunderstorm Warnings in Texas, 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.