During the late morning and into the afternoon a series of slow moving thunderstorms moved across Southwest Nebraska. Large hail up to quarter size was reported southeast of McCook and Northwest of Herndon, KS.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GLD wrote it up.
During the late morning and into the afternoon a series of slow moving thunderstorms moved across Southwest Nebraska. Large hail up to quarter size was reported southeast of McCook and Northwest of Herndon, KS. The prolonged rainfall northeast of Trenton along Highway 34 south to the Republican river drained through a culvert east of Trenton, washing out the culvert under North River Drive just east of Trenton. The same series of storms moved east producing rapid, heavy rainfall over McCook. This sudden, heavy rainfall caused cars to stall in town and lifted manhole covers.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Goodland, KS wrote its last area forecast discussion before the first event at Aug 4, 8:54 AM CST, 1 hour 27 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GOODLAND KS 854 AM MDT TUE AUG 4 2015 .UPDATE... ISSUED AT 854 AM MDT TUE AUG 4 2015 EXPIRED DENSE FOG ADVISORY FOR SW NEBRASKA. && .SHORT TERM...(TODAY THROUGH THURSDAY NIGHT) ISSUED AT 335 AM MDT TUE AUG 4 2015 AS OF 4 AM CDT...3 AM MDT...SKIES ACROSS THE TRI-STATE REGION ARE MOSTLY CLOUDY AS THUNDERSTORM ANVIL CIRRUS MOVES OVER AND STATUS/FOG DEVELOPS OVER SOUTHWEST NEBRASKA. TEMPERATURES ARE IN THE LOW 60S TO LOW 70S. WINDS ARE LIGHT AND VARIABLE. AT THE SURFACE...A WEAK COLD FRONT IS LOCATED ROUGHLY ALONG AN IMPERIAL NEBRASKA TO NORTON KANSAS LINE. FOG HAS DEVELOPED IN THE VICINITY OF THIS FRONT AND DENSE FOG IS BEING OBSERVED IN SOUTHWEST NEBRASKA AT MCCOOK AND IMPERIAL. AN AREA OF LOW PRESSURE EXTENDED ALONG THE FRONT RANGE. ALOFT...A SIGNIFICANT SHORTWAVE TROUGH IS LOCATED OVER WESTERN COLORADO... SLOWLY SLIDING EAST THIS MORNING. IT IS THIS TROUGH THAT WILL PROVIDE THE LIFT FOR SEVERE THUNDERSTORMS THIS AFTERNOON. INITIAL FORECAST CONCERN THIS MORNING IS THE DEVELOPMENT OF DENSE FOG. AS MENTIONED ABOVE...DENSE FOG IS BEING OBSERVED ACROSS SOUTHWEST NEBRASKA IN THE VICINITY OF A STALLED FRONT. MOISTURE HAS POOLED HERE AND WITH TEMPERATURES FALLING...FOG WAS EASILY ABLE TO DEVELOP. HIGH RESOLUTION GUIDANCE INDICATES THAT DENSE FOG SHOULD REMAIN CONFINED TO THE FRONT IN SOUTHWEST NEBRASKA. CAN'T RULE OUT SOME DENSE FOG IN YUMA COUNTY COLORADO AND EXTREME NORTHWEST KANSAS BUT CONFIDENCE IS NOT HIGH ENOUGH TO INCLUDE IN THE DENSE FOG ADVISORY. TRENDS WILL BE MONITORED IN CASE THE DENSE FOG ADVISORY NEEDS TO BE EXPANDED. THE MOST HAZARDOUS WEATHER DURING THE SHORT-TERM FORECAST PERIOD COMES IN THE FORM OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING. AFTER COLLABORATION WITH THE STORM PREDICTION CENTER...A SLIGHT RISK OF SEVERE WEATHER WAS ISSUED. ACCORDING TO LATEST CONVECTION ALLOWING MODELS...STORMS MAY FIRE QUITE EARLY THIS AFTERNOON...AROUND TO JUST AFTER NOON...ALONG THE STALLED FRONTAL BOUNDARY AND A DRYLINE THAT WILL TAKE SHAPE ALONG A YUMA COLORADO TO LEOTI KANSAS LINE. BY THIS TIME...A HIGHLY UNSTABLE AIRMASS WILL TAKE SHAPE AND FORECAST SOUNDINGS INDICATE NO CAPPING INVERSION. SBCAPE OF 2000-3000 J/KG...850-500 MB LAPSE RATES OF 7-8 C/KM AND DCAPE APPROACHING 1000-1500 J/KG CHARACTERIZE THE THERMODYNAMIC ENVIRONMENT. AS THE SHORTWAVE AND ASSOCIATED WIND MAX MOVE OVER... 0-6 KM BULK SHEAR GROWS TO 35-55 KNOTS WITH 0-3 KM HELICITY APPROACHING 200 M2/S2...POSSIBLY 300 M2/S2. LCLS FOR THIS EVENT ARE PROJECTED TO BE AROUND 1000M...CLIMATOLOGICALLY FAVORABLE FOR TORNADOES. IN THE END...DO EXPECT A SEVERE WEATHER OUTBREAK TODAY WITH SUPERCELLS AS THE INITIAL CONVECTIVE MODE. LARGE HAIL... DAMAGING WINDS AND POSSIBLY A TORNADO OR TWO ARE POSSIBLE. RIGHT MOVING STORMS WILL MOVE SOUTHEAST AT 10-20 MPH AND EVENTUALLY FORM INTO AN MCS OR TWO. AS THE MCS DEVELOPS...THE TORNADO THREAT DIMINISHES. STORMS SHOULD EXIT THE REGION AROUND TO SHORTLY AFTER MIDNIGHT. THE OTHER THREAT TO WATCH IS HEAVY RAINS AND FLASH FLOODING. PRECIPITABLE WATER VALUES SHOULD APPROACH 1.50" TO 1.75" BY THIS EVENING AS MOISTURE ADVECTION PERSISTS. IN ADDITION...RIGHT MOVING SUPERCELL STORMS SHOULD MOVE PARALLEL TO THE DRYLINE. THIS INCREASES THE THREAT FOR TRAINING STORMS. AS A RESULT...FLASH FLOODING WILL BE A CONCERN BUT UNSURE WHERE THE HIGHEST THREAT TAKES SHAPE THIS AFTERNOON. THIS THREAT HIGHLY DEPENDS ON THE DRYLINE LOCATION. AS OF NOW...ANTICIPATE THE FLASH FLOODING THREAT TO BE SOMEWHERE ALONG AND EAST OF A BENKELMAN NEBRASKA TO GOVE KANSAS LINE. ONCE THIS SHORTWAVE TROUGH PASSES...ANTICIPATE MOSTLY DRY WEATHER WEDNESDAY AND THURSDAY. WITH A MOISTURE BOUNDARY STILL IN PLACE... CAN NOT COMPLETELY RULE OUT A FEW ISOLATED STORMS ON THURSDAY. TEMPERATURES WILL WARM DURING MID-WEEK WITH HIGHS IN THE MID TO UPPER 90S LIKELY THURSDAY. .LONG TERM...(FRIDAY THROUGH MONDAY) ISSUED AT 230 AM MDT TUE AUG 4 2015 THE H5 RIDGE REMAINS IN PLACE OVER CENTRAL TEXAS FRIDAY THROUGH MONDAY. BOTH THE GFS AND ECMWF ARE IN GOOD AGREEMENT UPON THE STRENGTH AND PLACEMENT OF THE RIDGE. SEVERAL WEAK SHORTWAVES WILL ROTATE AROUND THE OUTER PERIPHERY AND PROVIDE A FOCUS FOR SHOWERS AND THUNDERSTORMS ON FRIDAY AND SATURDAY. THE 0 TO 6KM SHEAR WILL BE IN THE 45 TO 55KT RANGE WITH CAPE VALUES IN THE 1500 TO 2000 J/KG RANGE THUS STRONG TO SEVERE STORMS WILL BE POSSIBLE. SEVERE INDICES LOOK SLIGHTLY LESS FAVORABLE ON SATURDAY. THE GFS IS A BIT MORE AMPLIFIED AND PROGRESSIVE WITH THE TIMING BUT NOT BY A SIGNIFICANT AMOUNT. RAIN CHANCES REMAIN LOW ON SUNDAY WITH BOTH MODELS IN AGREEMENT THEREFORE I KEPT THE POPS AT OR BELOW 20 PERCENT. ANOTHER SHORTWAVE ROTATES AROUND AND INTERACTS WITH A WEAK STATIONARY THETA E BOUNDARY ON MONDAY AND WILL PROVIDE A FOCUS FOR THUNDERSTORM DEVELOPMENT ESPECIALLY IN THE NORTHERN AND EASTERN PORTIONS OF THE CWA. && .AVIATION...(FOR THE 12Z TAFS THROUGH 12Z WEDNESDAY MORNING) ISSUED AT 534 AM MDT TUE AUG 4 2015 VFR CONDITIONS ANTICIPATED AT KGLD OVER THE NEXT 24 HOURS. UNLIKE KGLD...KMCK IS CURRENTLY ENGULFED IN DENSE FOG. FOG FORMED IN THE VICINITY OF A STALLED FRONT WHERE MOISTURE IS POOLED. FOG SHOULD DISSIPATE BY LATE MORNING. THUNDERSTORM DEVELOPMENT OCCURS THIS AFTERNOON AS A VIGOROUS DISTURBANCE PUSHES THROUGH. STORMS LIKELY DEVELOP ON A DRYLINE AND THE PREVIOUSLY MENTIONED FRONT. STORMS WILL MOVE OVER KMCK BUT UNSURE IF THEY WILL REACH KGLD. FOR NOW...MENTIONED VCTS AT KGLD. STORMS LIKELY EXIT THE REGION THIS EVENING. ANOTHER ROUND OF FOG IS POSSIBLE...ESPECIALLY AT KMCK. PLACED A MVFR FOG MENTION INTO KMCK TAF FOR NOW. && .GLD WATCHES/WARNINGS/ADVISORIES... KS...NONE. CO...NONE. NE...NONE. && UPDATE...024 SHORT TERM...RRH LONG TERM...TL AVIATION...RRH
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GOODLAND KS 254 AM MDT TUE AUG 4 2015 COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-050900- YUMA-KIT CARSON-CHEYENNE CO-CHEYENNE KS-RAWLINS-DECATUR-NORTON- SHERMAN-THOMAS-SHERIDAN-GRAHAM-WALLACE-LOGAN-GOVE-GREELEY-WICHITA- DUNDY-HITCHCOCK-RED WILLOW- 254 AM MDT TUE AUG 4 2015 /354 AM CDT TUE AUG 4 2015/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL COLORADO... EXTREME SOUTHWEST NEBRASKA AND NORTHWEST KANSAS. .DAY ONE...TODAY AND TONIGHT... DENSE FOG HAS DEVELOPED THIS MORNING ACROSS SOUTHWEST NEBRASKA. VISIBILITIES AS LOW AS ONE QUARTER MILE ARE EXPECTED UNTIL MID- MORNING. SEVERE THUNDERSTORMS ARE EXPECTED THIS AFTERNOON GENERALLY EAST OF A YUMA COLORADO TO LEOTI KANSAS LINE. THE MAIN THREATS WITH THESE STORMS WILL BE LARGE HAIL...DAMAGING WINDS AND PERHAPS A TORNADO. HEAVY RAINFALL AND FLASH FLOODING MAY ALSO BE A CONCERN FOR LOCATIONS THAT RECEIVE MULTIPLE ROUNDS OF STORMS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY... NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GOODLAND KS
1100 AM CDT TUE AUG 4 2015
NEZ080-081-041645-
RED WILLOW NE-HITCHCOCK NE-
1100 AM CDT TUE AUG 4 2015
...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL HITCHCOCK AND
WESTERN RED WILLOW COUNTIES UNTIL 1145 AM CDT...
AT 1100 AM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 6
MILES SOUTHWEST OF MCCOOK...MOVING NORTHEAST AT 15 MPH.
DIME SIZE HAIL WILL BE POSSIBLE WITH THIS STORM.
LOCATIONS IMPACTED INCLUDE...
MCCOOK AND INDIANOLA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.
&&
LAT...LON 4026 10032 4001 10066 4013 10084 4035 10066
4035 10046
TIME...MOT...LOC 1600Z 219DEG 15KT 4013 10069
024The Goodland radar (KGLD), 135 km away, was scanning. The volume nearest the first event began at 16:22 UTC.
2 flash flood, 2 hail. Local standard time, as filed.
Vehicles have stalled on roads and manhole covers were lifted with water gushing out of them. There is quite a bit of debris mixed in with the rushing water.
Heavy rainfall was also occurring with the quarter size hail.
A culvert was washed out on North River Drive between Trenton and Culbertson.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2015Every state in 2015This day in weather historyWarnings in Nebraska, August 2015
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 593329, 593336, 593338, 593332.