Alert archive / Iowa / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 132, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 16, 2007, 4:42 PM CDT for Pocahontas County, Iowa. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jun 16, 2007, 4:42 PM CDT (21:42 UTC)
- Expired
- Jun 16, 2007, 5:15 PM CDT
- In force
- 33 min
- Issued by
- NWS Des Moines, IA
- Area
- Counties, with a storm outline in the text
County Pocahontas County, IA
The radar
The Des Moines radar (KDMX), 137 km from the middle of the area, began a volume at 21:44 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.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 9.7 hours before the alert went out and 210 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
- 197 J/kg
- Mixed-layer CIN
- -95 J/kg
- Mixed-layer LCL
- 1536 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -41 m²/s²
- 0-3 km storm-relative helicity
- -7 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Jun 16, 3:35 PM CDT, 1 hour 7 minutes earlier.
Area forecast discussion, Jun 16, 3:35 PM CDT, 1 hour 7 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DES MOINES IA 335 PM CDT SAT JUN 16 2007 .DISCUSSION... WESTERLIES ENTER THE CONUS IN THE PAC NW AND THEN RUN ENE ACROSS THE NRN TIER OF STATES. WATER VAPOR IMAGERY SHOWING DECENT LOOKING S/WV OVER THE PAC NW WHICH WILL IMPACT IA IN THE MONDAY TIME FRAME. OUTFLOW BOUNDARY FROM MORNING CONVECTION PUSHED SOUTH INTO CENTRAL IA BY EARLY THIS AFTERNOON. TSTMS FIRED ALONG BOUNDARY IN UNCAPPED AMS. EXPECT CONVECTION TO WEAKEN IN CENTRAL IA EARLY BUT IT MAY LAST LONGER IN NRN IA WHERE THERE IS MORE SUPPORT FOR CONVECTION. AFTER MIDNIGHT...BOUNDARIES SHOULD LIFT N OF IA AS UPSTREAM S/WV APPROACHES. THEREFORE...CURRENT THINKING IS FOR TSTMS TO END IN DMX CWA. IA IN WARM SECTOR AHEAD OF APPROACHING SYSTEM SUNDAY. WILL FORECAST WARM TEMPERATURES AND BREEZY CONDITIONS. WINDS SHOULD BE STRONGEST NW WHERE GRADIENT IS TIGHTER AND 850 MB FLOW STRONGER. WL HAVE NEAR ADVRY CRITERIA WINDS BUT WILL HOLD OFF ON ADVRY FOR NOW. GFS/NAM IN FAIR AGREEMENT LIFTING MOST OF THE S/WV ENERGY NE NORTH OF IOWA ON MONDAY. TRAINING COLD FRONT WILL MOVE INTO WARM AND MOIST AMS OVER IA. THERE SHOULD BE ENOUGH FORCING TO GENERATE TSTMS. CAPE AND DEEP SHEAR LOOK LIMITED SO SVR CONVECTION NOT LIKELY. IN LONGER TERM...00Z GFS AND GFS ENSEMBLES LOOKED FAIRLY REASONABLE THIS MORNING COMPARED WITH YESTERDAY. OTHER EURO MODELS WERE SIMILAR. A LOW AMPLITUDE RIDGE WEST OF IA WITH A TROUGH TO THE NORTHEAST. THERE WILL BE A WEST TO EAST SFC BOUNDARY ACROSS THE CENTRAL STATES WITH THIS PATTERN. WILL FORECAST TSTMS WITH A WEAK SYSTEM TUE NIGHT AND WED OVR IA WITH SMALL POPS. WENT DRY BEYOND THAT SINCE WE CANNOT NARROW DOWN SPECIFICS IN THE PATTERN. WITH THAT SAID...THERE MAY IN POPS INTRODUCED AS THIS TIME PERIOD NEARS. IOWA DNR ISSUED AN AIR QUALITY ADVRY EARLIER TODAY. NO PLANS TO UPDATE THIS PRODUCT UNLESS WE HEAR FROM DNR. .AVIATION 16/18Z... OUTFLOW FM MCS OVR NIGHT SLID SWD INTO CNTRL IA AND WL BE THE FOCUS FOR SOME TSRA DVLPMT. WL REMAIN N OF KDSM AND KOTM HWVR. DVLPMT QUITE LKLY WITH THE SYS MOVG OUT OF SD AND CARRIED INTO THE EVE FOR THE NRN 3 TAFS. SHOULD SEE THE SD COMPLEX DVLP/DRFT MORE SWD AS CORFIDI WNDS GRDLY TURN WLY TO NLY THIS EVE. && .DMX WATCHES/WARNINGS/ADVISORIES...AIR QUALITY ADVISORY THROUGH 17Z SUNDAY ALL OF CWA. && JOHNSON
Hazardous weather outlook, Jun 16, 1:32 PM CDT, 3 hours 10 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 132 PM CDT SAT JUN 16 2007 IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075- 081>086-092>097-171100- EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO- POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-SAC-CALHOUN- WEBSTER-HAMILTON-HARDIN-GRUNDY-BLACK HAWK-CRAWFORD-CARROLL-GREENE- BOONE-STORY-MARSHALL-TAMA-AUDUBON-GUTHRIE-DALLAS-POLK-JASPER- POWESHIEK-CASS-ADAIR-MADISON-WARREN-MARION-MAHASKA-ADAMS-UNION- CLARKE-LUCAS-MONROE-WAPELLO-TAYLOR-RINGGOLD-DECATUR-WAYNE- APPANOOSE-DAVIS- 132 PM CDT SAT JUN 16 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ALL OF CENTRAL IOWA. .DAY ONE...THIS AFTERNOON AND TONIGHT ISOLATED THUNDERSTORMS ARE EXPECTED TODAY FROM INTERSTATE 80 NORTH. SCATTERED THUNDERSTORMS WILL BE POSSIBLE TONIGHT NORTH OF U.S. HIGHWAY 30. THERE IS LITTLE CHANCE OF SEVERE THUNDERSTORMS...THOUGH AN ISOLATED SEVERE STORM IS POSSIBLE NORTH OF U.S. HIGHWAY 18 THIS EVENING...WITH NICKEL SIZE HAIL AND 60 MPH WINDS THE MAIN THREATS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY ADDITIONAL THUNDERSTORMS WILL BE POSSIBLE MONDAY AND MONDAY NIGHT...AND AGAIN TUESDAY INTO TUESDAY NIGHT. STORMS WILL BE MOST WIDESPREAD ACROSS THE OUTLOOK AREA MONDAY AND MONDAY NIGHT. A FEW SEVERE STORMS ARE POSSIBLE...ESPECIALLY IN THE NORTHEAST NEAR WATERLOO AND MASON CITY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED ON AN ISOLATED BASIS THIS EVENING OVER FAR NORTHERN IOWA.
In the hours before
Local storm report, Jun 16, 4:18 PM CDT, 24 minutes before
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</html>The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 16, 12:42 PM CDT | Air Stagnation Advisory | DMX | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more | 21 hr |
| Jun 16, 2:51 PM CDT | Severe Thunderstorm Warning | DMX | Boone | 39 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2007Every severe thunderstorm warning in 2007
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.