Severe Thunderstorm Warning 171, NWS Des Moines, IA

Issued

Jul 26, 2000, 6:10 PM CDT (23:10 UTC)

Expired

Jul 26, 2000, 6:45 PM CDT

In force

35 min

Issued by

NWS Des Moines, IA

Area

Whole counties

County Cass County, IA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

000 
WUUS53 KDMX 262309
SVRDSM
IAC029-262345-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
610 PM CDT WED JUL 26 2000

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN CASS COUNTY IN SOUTHWEST IOWA

* UNTIL 645 PM

* AT 610 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES NORTH OF LEWIS...OR ABOUT 41 MILES
  EAST OF COUNCIL BLUFFS...MOVING SOUTH AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  NEAR LEWIS NOW
  NEAR GRISWOLD AROUND 610 PM

DAMAGING HAIL UP TO THE SIZE OF GOLFBALLS IS LIKELY IN THE WARNED
AREA.

INTENSE RAINS ARE FLOODING ROADSIDE DITCHES AND UNDERPASSES...DO NOT
DRIVE INTO WATER OF UNKNOWN DEPTH.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER...
SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING.

LAT...LO[N 4150 9515 4116 9515 4116 9491 4150 9494

JOHNSON/COGIL

NNNN

NWS Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 26, 1:45 PM CDT, 4 hours 25 minutes earlier.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
145 PM CDT WED JUL 26 2000

MAIN CONCERN OF THIS FCST WILL BE PCPN IN MARGINAL AREAS OF SHORT
RANGE FORECAST IN RELATION TO FRONTAL LOCATON.  THEN IN EFP PDS
MODELS SHOWING DRIER TRENDS WITH TIME THO NUMERICAL GUIDANCE RUNS
CHC THRU ENTIRE PD.

ALL MODELS CLOSE IN SOLUTION WITH UPPER LO MOVING THROUGH MN/WI IN
ERY FCST PDS.  TRAILING TROF MOVING THROUGH MOIST UNSTABLE AIRMASS
AT LEAST WORTH GD CHC TNGT MUCH OF CWA THO NC AND NW SHULD REMAIN
DRY.  LOOK AT Q VECTORS/FRONTOGENSIS 850/700 LVLS SUGGEST SRN HLF OF
ST HAS BEST SHOT AT MORE WX THIS EVENING.  DEEP MOISTURE AND LI -8
TO -12 ALONG WITH VERY HI CAPES.  ATTM REDVLPMNT ALRDY STARTED IN W
CNTRL IA.  BNDRY IS EXPECTED TO LAY ACRS SRN IA WITH FURTHER DVLPMNT
ON THU WITH REST OF ST HI AND DRY.  AVN PCPN FIELDS LOOK BEST FIT
THO NOT MUCH DISAGREEMENT WITH MESOETA/NGM AS S/W MOVES UP ALG IA/MO
BORDER.  FRI AND SAT DRY OVR MUCH OF ST THO SRN TIER IN DOUBT.  SAT
NGT S AND E.  SUN REAL QUESTIONABLE AS IS MON WITH S/W FINALLY OUT
OF THE AREA.

TEMP GUID LOOKS REASONABLE.

.DSM...NONE

FORSTER

Severe Thunderstorm Warnings in Iowa, 2000Every severe thunderstorm warning in 2000

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.