Alert archive / Iowa / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 280, NWS Des Moines, IA

July 3, 2001Clarke County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 3, 2001, 3:47 PM CDT for Clarke County, Iowa. It was in force for 48 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 3, 2001, 3:47 PM CDT (20:47 UTC)
Expired: Jul 3, 2001, 4:35 PM CDT
In force: 48 min
Issued by: NWS Des Moines, IA
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Clarke County, IA

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 8.8 hours before the alert went out and 213 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 384 J/kg
Mixed-layer CIN: -390 J/kg
Mixed-layer LCL: 1434 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 371 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

804 
WUUS53 KDMX 032047
SVRDSM
IAC039-032135-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
347 PM CDT TUE JUL 3 2001

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CLARKE COUNTY IN SOUTH CENTRAL IOWA

* UNTIL 435 PM CDT

* AT 343 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER NORTH CENTRAL CLARKE COUNTY...OR ABOUT 32
  MILES SOUTH OF DES MOINES...MOVING EAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
IN RURAL NORTHERN CLARKE COUNTY AROUND 400 PM
IN RURAL NORTHEASTERN CLARKE COUNTY AROUND 410 PM

DAMAGING HAIL UP TO TWO INCHES IN DIAMETER IS LIKELY IN THE WARNED
AREA.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM TUESDAY EVENING FOR
SOUTHERN IOWA.

LAT...LON 4116 9402 4106 9401 4102 9357 4116 9357

SEARCY

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 Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 3, 3:30 PM CDT, 17 minutes earlier.

Area forecast discussion, Jul 3, 3:30 PM CDT, 17 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
330 PM CDT TUE JUL 3 2001

IN THE L/W...LRG UPR RDG OVR WRN US XPNDS TWD THE CNTRL U.S. AS ERN
TROF IS REENFORCED WITH A DECENT CIRC OUT OF JAMES BAY. TREND FOR FA
WL BE AN INCRGLY STABLE AMS WITH SLIGHTLY BLO NORMAL TMPS TIL FRI
NGT. IN THE MEANTIME...QSTNRY FNT NR TQE TO ALO TO DEH WL NOT MOVE
MUCH TIL WRN NEB S/W PASSES. AMS S OF BNDRY IS DESTABILIZING QUICKLY
AS INDICATED BY LAPS AND SATL DATA...PLUS FAST DVLPMT ON 88D IN THE
LAST 15 MINUTES. CELLS ARE MOVG EWD. WL HAVE POPS FIRST PD WITH THIS
SITUATION...WATCH LIKELY TO COME. RMDR OF FCST FAIRLY STRAIGHT
FORWARD WITH DRY/STABLE AMS IN PLACE TIL FRI NGT/SAT. XTENDED
UNSETTLED AS LOW LVL WAA RETURNS AND UPR RDG FLATTENS SOMEWHAT.

.DSM...NONE
MYERS

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 3, 3:11 AM CDT	Severe Thunderstorm Warning	DMX	Hancock, Kossuth	39 min
Jul 3, 3:23 PM CDT	Severe Thunderstorm Warning	DMX	Madison, Warren	52 min
Jul 3, 4:20 PM CDT	Severe Thunderstorm Warning	DMX	Warren	40 min
Jul 3, 4:33 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold	22 min
Jul 3, 4:46 PM CDT	Severe Thunderstorm Warning	DMX	Marion	39 min
Jul 3, 4:52 PM CDT	Severe Thunderstorm Warning	DMX	Lucas	28 min
Jul 3, 5:01 PM CDT	Severe Thunderstorm Warning	DMX	Clarke	19 min
Jul 3, 5:05 PM CDT	Severe Thunderstorm Warning	DMX	Decatur	40 min
Jul 3, 5:29 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion	31 min
Jul 3, 5:48 PM CDT	Severe Thunderstorm Warning	DMX	Decatur	32 min
Jul 3, 6:03 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold	32 min
Jul 3, 6:23 PM CDT	Severe Thunderstorm Warning	DMX	Decatur	42 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2001 Every 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.