Severe Thunderstorm Warning 184, NWS Des Moines, IA

Issued

Aug 12, 2000, 11:41 PM CDT (04:41 UTC)

Expired

Aug 13, 2000, 12:15 AM CDT

In force

34 min

Issued by

NWS Des Moines, IA

Area

Whole counties; the outline is the Mesonet’s reconstruction

County Palo Alto County, IA

The Sioux Falls radar (KFSD), 166 km from the middle of the area, began a volume at 04:44 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.

000 
WUUS53 KDMX 130441
SVRDSM
IAC147-130515-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1141 PM CDT SAT AUG 12 2000

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN PALO ALTO COUNTY IN NORTHWEST IOWA

* UNTIL 1215 AM

* AT 1132 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 9 MILES WEST OF AYRSHIRE...OR ABOUT 9 MILES
  SOUTHEAST OF SPENCER...MOVING SOUTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  NEAR AYRSHIRE AROUND MIDNIGHT
  6 MILES SOUTHWEST OF CURLEW AROUND 1220 AM

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

DAMAGING WINDS OF 60 TO 70 MILES AN HOUR ARE LIKELY IN THE WARNED
AREA.

DAMAGING STRAIGHT-LINE WINDS OVER 75 MPH CAN SOUND JUST LIKE A
TORNADO AND CAUSE JUST AS MUCH DAMAGE.

INTENSE RAINFALL CAN ACCOMPANY SEVERE THUNDERSTORMS...WHICH CAN
QUICKLY FLOOD LOW LYING AREAS AND ROADWAYS. DO NOT DRIVE INTO AREAS
WHERE WATER COVERS THE ROAD.

LAT...LON 4316 9490 4293 9489 4293 9467 4315 9465

KULA
NNNN

NWS Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 12, 9:15 PM CDT, 2 hours 26 minutes earlier.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
915 PM CDT SAT AUG 12 2000

KIND OF IN A WAIT AND SEE MODE RIGHT NOW. SURFACE BASED CONVECTION
HAS HAD GREAT DIFFICULTY DEVELOPING TO OUR NORTH WITH QUITE WARM MID
LEVEL TEMPERATURES. WILL CONTINUE TO MONITOR OVER THE NEXT HOUR OR
SO AS CELL JUST NORTH OF FAIRMONT HAS SENT OUT A RING OUTFLOW THAT
IS DEVELOPING ADDITIONAL CELLS. FURTHER WEST...CONVERGENCE ALONG THE
SURFACE BOUNDARIES REMAINS FAIRLY WEAK WHILE THE OMA SOUNDING SHOWS
A HEFTY CAP. MESO ETA AND RUC DO DEVELOP A FAIRLY GOOD BAND OF
ELEVATED THETA-E CONVERGENCE MOVING SOUTH INTO CENTRAL IOWA FROM 06Z
TO 09Z ALONG WITH 925-850 MB WINDS FROM 25 TO 35 KTS...MESO ETA IS A
BIT STRONGER. MOISTURE INFLOW IS NOT GREAT AT THESE LEVELS ALTHOUGH
IT IS PROBABLY ADEQUATE. BEST ELEVATED LI REMAINS OVER THE N AND W
OVERNIGHT. SO IT LOOKS LIKE THE BEST BET FOR ADDITIONAL CONVECTION
DEVELOPING OVERNIGHT WILL DEPEND ON WHETHER ANY ELEVATED CBS CAN GET
GOING OVER THE NW PORTION OF OUR CWA. AT THIS POINT...EVEN IF SOME
CONVECTION DOES DEVELOP...DO NOT THINK THINGS WILL BE THAT
WIDESPREAD. PLAN ON LOWERING POPS MOST AREAS...BUT WILL KEEP IN T"HE
SCATTERED CATEGORY ACROSS THE NORTH AND NORTHWEST.

TORNADO WATCH ACROSS THE NORTH WILL EXPIRE AT 10 PM.

.DSM...NONE

JAW

In the hours before

IAZ004>007-015>017-023>028-130314-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
956 PM CDT SAT AUG 12 2000

...TORNADO WATCH NUMBER 683 ALLOWED TO EXPIRE...
THE TORNADO WATCH THAT WAS IN EFFECT UNTIL 10 PM CDT FOR PORTIONS OF
NORTHERN IOWA HAS BEEN ALLOWED TO EXPIRE.

SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP OVER NORTHERN IOWA
THROUGHOUT THE LATE EVENING AND EARLY MORNING. SOME OF THESE STORMS
MAY BE STRONG...HOWEVER THE TORNADO THREAT HAS DECREASED.

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.